Agenda packet, regular meeting, second session — Antioch City Council, June 9, 2026 (part 3 of 4)

I HEREBY CERTIFY that the foregoing resolution was passed and adopted by the City Council of the City of Antioch at a regular meeting thereof, held on the 9 th day of June 2026, by the following vote:

AYES:

NOES:

ABSTAIN:

ABSENT:

_____________________________________
MICHAEL J. MANDY

CITY CLERK OF THE CITY OF ANTIOCH

A2
ATTACHMENT "B"
ATTACHMENT “C”

Recording Requested By:

Return to: CITY OF ANTIOCH
City Clerk
200 H Street
Antioch, CA 94509

______________________________________________________________________________

CITY OF ANTIOCH

STORMWATER MANAGEMENT FACILITIES OPERATIONS

AND MAINTENCE AGREEMENT

AND RIGHT OF ENTRY

PROJECT: Laurel Ranch Townhomes

DEVELOPER/OWNER: LAUREL RANCH 216 OWNER, LLC,

ASSESSOR'S PARCEL NUMBER:
053-060-055-0, 053-060-056-8, 053-060-057-6, and 053-
060-063-4

C1
- 2 -

STORMWATER MANAGEMENT FACILITIES

OPERATION AND MAINTENANCE AGREEMENT

AND RIGHT OF ENTRY

This Stormwater Management Facilities Operation and Maintenance Agreement and Right of Entry ("Agreement") is made and entered into this ____________ day of _ _______________, 20___, by and between Laurel Ranch 216 Owner LLC (hereinafter referred to as "Property Owner") and the City of Antioch, a municipal corporation ("City").

RECITALS:

This Agreement is made and entered into with reference to the following facts:

WHEREAS, the Permanent Stormwater Pollution Prevention Measures (hereinafter referred to as Best Management Practices or "BMP") have been installed in and must be maintained for the development called Laurel Ranch Townhomes, located along the south side of Laurel Road just west of the SR4 Bypass in Antioch, CA, Contra Costa County, State of California and more particularly described on Exhibit A attached hereto and incorporated herein by reference (the "property" or "real property"); and, WHEREAS, the Property Owner is the owner of real property more particularly described on the attached as Exhibit A; and,

WHEREAS, the City is the owner of its storm drains outside the BMP area; and

WHEREAS, the City’s Stormwater Management and Discharge Control Ordinance ("Ordinance") requires proper operation and maintenance of the BMP constructed on this property; and,

WHEREAS, the City has approved the Stormwater Control Operation and Maintenance Plan prepared by Wood Rodgers, Inc. on the day of _______________________, 2026, as this Plan may be subsequently modified from time to time with City’s approval; and,

WHEREAS, the development conditions of approval require that the BMP, as shown on the approved Stormwater Control Plan, be constructed and properly operated and maintained by the Property Owner; and,

WHEREAS, the Stormwater Control Operation and Maintenance Plan includes an annual inspection checklist for the BMP constructed on this property, and,

WHEREAS, this Agreement memorializes the Property Owner’s maintenance, operations, and inspection obligations under the City’s Ordinance and the approved Plans.

NOW, THEREFORE, in consideration of the foregoing premises, the mutual covenants contained herein, and the following terms and conditions, the parties hereto agree as follows:

C2
- 3 -
SECTION 1

Responsibility for Operation and Maintenance: The Property Owner will make available copies of the approved Stormwater Control Plan and approved Stormwater Control Operation and Maintenance Plan (hereinafter the “Plans”) at the property with the facility or property manager and must maintain the BMP in good working condition acceptable to the City for the life of the Project, and in compliance with the Ordinance and the approved Plans. Upon transfer of the property, the Property Owner shall provide the new owner with the current Plans.

SECTION 2

Inspection by Property Owner: The Property Owner, at its own expense, shall conduct annual inspections during the month of August and February of each year. The annual inspection report shall include completion of the checklist described in the approved Stormwater Control Operation and Maintenance Plan. A qualified independent inspector who is acceptable to the City must inspect the BMP.

The Property Owner must submit the inspection report on the BMP to the City Engineer within 30 days after each inspection. A processing fee established in the City's standard fee schedule shall accompany the annual inspection report.

SECTION 3

Right of Entry and Facility Inspection by the City: The Property Owner hereby grants permission to the City, its authorized agents and employees, the Contra Costa County Fire Protection District, County Environmental Health Department, the Contra Costa Mosquito and Vector Control District, and the Regional Water Quality Control Board to enter the property, and to inspect the BMP whenever any of the foregoing entities deems necessary to enforce provisions of the Ordinance. These entities may enter the premises at any reasonable time to inspect the premises and BMP operation, to inspect and copy records related to storm water compliance, and to collect samples and take measurements. Whenever possible, these entities will provide notice prior to entry.

SECTION 4

Failure to Perform Required Facility Repairs or Maintenance by the Property Owner: If the Property Owner or its successors fail to maintain the BMP in good working order and in accordance with the approved Plans and the City’s Ordinance, the City, with prior notice, may enter the property to return the BMP to good working order. The City is under no obligation to maintain or repair the BMP, and this Agreement may not be construed to impose any such obligation on the City. If the City, under this section takes any action to return the BMP to good working order, the Property Owner shall reimburse the City for all the costs incurred by the City. The City will provide the Property Owner with an itemized invoice of the City’s costs and the Property Owner will have 30 days to pay the invoice. If the Property Owner fails to pay the invoice within 30 days, the City may secure a lien against the real property of the Property Owner in the amount of such costs. In addition the City may make the cost of abatement of the nuisance caused by the failure to maintain the BMP a special assessment against the property that may be collected at the same time and in the same manner as ordinary municipal taxes are collected as provided in Government Code section 38773.5. This Section 4 does not prohibit the City from pursuing other legal recourse against the Property Owner.

C3
- 4 -

SECTION 5

Indemnity: The Property Owner agrees to defend, indemnify and holds harmless the City, its officials, employees and its authorized agents from any and all damages, accidents, casualties, occurrences or claims which might arise or be asserted against the City and which are in any way connected with the construction, operation, presence, existence or maintenance of the BMP by the Property Owner, or from any personal injury or property damage that may result from the City or other public entities entering the property under Section 3 or 4.

SECTION 6

Insurance: Prior to the commencement of any work, the Property Owner shall furnish to the City, a certificate of insurance establishing satisfactory evidence of a project specific policy of liability insurance which shall be maintained at all times during the perfor mance of their Agreement and until the acceptance of improvements by the City Council, in form and by a responsible company satisfactory to the City, insuring that the City, its officers, agents, and employees are held harmless and indemnified against loss or liability arising out of the condition of the premises or any of the work to be performed under this agreement by the Property Owner, including all costs of defending any claim arising as a result thereof. All insurance companies affording coverage to the Property Owner shall be required to add the City of Antioch as “additional insured” under the insurance policy for all work performed in accordance with this Agreement. Said policy or policies shall provide that the coverage afforded thereby shall be primary coverage to the full limit of liability stated in the declarations, and that if any of the City insured’s have other insurance against the loss covered by said policy or policies, the other insurance shall be excess only. Said policy or policies shall provide for insurance in accordance with City required minimum limits in the amount of Two Million Dollars ($2,000,000) for bodily injury or death, each person, and Four Million Dollars ($4,000,000) for bodily injury or death, aggregate, and Four Million Dollars ($ 4,000,000) for property damage, aggregate. All insurance companies affording coverage to the Property Owner shall be insurance organizations authorized by the Insurance Commissioner of the State Department of Insurance to transact business of insurance in the State of California acceptable to the City Attorney, preferable with a Best’s rating of not less than A:VII. Each policy shall contain an endorsement that said policy shall not be cancelled or coverage reduced except upon thirty (30) days advance written notice thereof to the City. The Property Owner shall require its general contractor(s) and/or subcontractor(s) to obtain satisfactory insurance (Commercial General Liability) and add the City of Antioch as “additional insured” under the policy. The City of Antioch requires $2,000,000 commercial general liability for property damage and $4,000,000 for bodily injury or death, aggregate, and the City shall be sent copies of the insurance certificates and additional insured endorsements for review and file. In addition, it shall be the responsibility of the Property Owner to ensure all Contractors and/or Subcontractors compliance with the insurance requirement as outlined in this section.

(b) Worker’s Compensation Insurance. The Property Owner shall take out and maintain, during the life of this agreement, Workers’ Compensation insurance for all the Property Owner’s employees employed at the site of all public Improvements, and in case any work is sublet, the Property Owner shall require any general contractor or subcontractor similarly to provide Workers’ Compensation insurance for contractor’s or subcontractor’s employees, unless such employees are covered by the protection afforded by the Property Owner. In case any class of employees engaged in work under this Agreement at the site of the project is not protected under any Workers’ Compensation law, the Property Owner shall provide, and shall C4
- 5 -
cause each contractor and subcontractor to provide, adequate insurance for the protection of employees not otherwise protected. Property Owner hereby indemnifies City for any damage resulting to it from failure of either the Property Owner, its agents, employees, contractor, or subcontractor to take out or maintain such insurance.

SECTION 7

Successors and Assigns: The covenants of the Property Owner set forth in numbered Sections 1 through 5 above shall run with the land, and the burdens thereof shall be binding upon each and every part of the property and upon the Property Owner, its successors and assigns in ownership (or any interest therein), for the benefit of its storm drains and each and every part thereof and said covenants shall inure to the benefit of and be enforceable by the City, its successors and assigns in ownership of each and every part of the City’s streets and storm drains.

SECTION 8

Severability: Invalidation of any one of the provisions of this Agreement shall in no way effect any other provisions and all other provisions shall remain in full force and effect.

Recommended for approval: City of Antioch:

____________________________________ ______________________________ Scott Buenting Ana Cortez
Director of Public Works-City Engineer Acting City Manager

Approved as to form: Attest:

____________________________________ ______________________________ Lori Asuncion Michael Mandy
City Attorney City Clerk

C5
- 6 -
Property Owner:

LAUREL RANCH 216 OWNER, LLC,
a Delaware limited liability company

By: BrightSky Residential, LLC,
a Delaware limited liability company,
its Authorized Agent

By: ______________________

Name: _Leonard Miller, _____

Title: _CEO__________________________

Attachments: Acknowledgements
Exhibit A – Legal Description
Exhibit B1 – Vicinity Map
Exhibit B2 – Stormwater Treatment Plan

C6
- 7 -

ALL PURPOSE ACKNOWLEDGMENT

State of California )
) s.s.

County of _____________ )

On _________________________, before me,
_________________________________, personally appeared
__________________________________________________________________, ______ personally known to me;
______ or proved to me on the basis of satisfactory evidence to be the person(s) whose name(s) is/are subscribed to the within instrument and acknowledged to me that he/she/they executed the same in his/her/their authorized capacity(ies), and that by his/her/their signature(s) on the instrument the person(s) or the entity upon behalf of which the person(s) acted, executed the instrument.

WITNESS my hand and official seal. (SEAL)

______________________________
Signature of Notary Public

CAPACITY CLAIMED BY SIGNER:

Though statute does not require the notary to fill in the data below, doing so may prove invaluable to persons relying on the document.

______ Individual(s)
______ Corporate Officer(s) Titles _____________ and ____________ ______ Partner(s) _____ Limited _____ General ______ Attorney-in-Fact
______ Trustee(s)
______ Guardian/Conservator
______ Other : ____________________________________________________

Signer is representing: ________________________________________________

ATTENTION NOTARY: Although the information requested below is optional, it could prevent fraudulent attachment of this certificate to unauthorized document.

Title or type of document _____________________________________________ Number of pages: __________ Date of document: _________________________ Signer(s) other than named above: _____________________________________

THIS CERTIFICATE MUST BE ATTACHED TO THE DOCUMENT DESCRIBED ABOVE

C7
Order Number: 0192-6936435
Page Number: 8
First American Title

Page 8 of 15 ends

LEGAL DESCRIPTION
Real property in the City of Antioch , County of Contra costa, State of California, described as follows:

Parcel 1:

Being a portion of New Parcel A per that Grant Deed recorded December 4, 2023, Doc. No. 2023- 0128565, contra Costa County Records, described as follows:

Beginning at the Easternmost point of Parcel One per a Grant Deed recorded October 27, 2017, Document No. 2017-0203296-00, said point also being distant South 89°20'17" East 2295.49 feet from a

1.25 inch iron pipe marking the West 1/4 corner of Section 34 T. 2 N, R. 2 E, M.D.B.&M.

Thence from said Point of Beginning, along the Southwesterly right-of-way line of state route 4 bypass the following 6 courses:

1. South 33°37'39" East, a distance of 87.40 feet;

2. Thence South 34°16'05" East, a distance of 224.05 feet;

3. Thence South 29°50'54" East, a distance of 354.69 feet;

4. Thence South 29°51'01" East, a distance of 159.64 feet;

5. Thence North 60°07'06" East, a distance of 14.95 feet;

6. Thence South 29°52'54" East, a distance of 25.00 feet; Thence, leaving said Southwesterly right-of-way line and proceeding along the Easterly line of said New Parcel A, South 60°07'06" West, a distance of 12.41 feet; thence South 04°25'06" West, a distance of 212.72 feet to a point of intersection with the Northeasterly right-of-way line of Country Hills Drive; Thence, along said Northeasterly right-of-way line, from a radial line which bears North 52°07'47" East, along a non-tangent curve concave to the Southwest, having a radius of 2442.00 feet, Northwesterly 266.78 feet along said curve through a central angle of 06°15'34"; Thence North 44°07'47" West, a distance of 21.16 feet;
Thence along a tangent curve concave to the Southwest, having a radius of 2571.00 feet, Northwesterly 467.60 feet along said curve through a central angle of 10°25'14"; Thence North 54°33'01" West, a distance of 147.71 feet; Thence along a tangent curve concave to the Southwest, having a radius of 1882.00 feet, Northwesterly

23.92 feet along said curve through a central angle of 00°43'41"; thence, leaving said Northeasterly right-of-way line, North 34°58'49" East, a distance of 322.26 feet; Thence North 32°42'32" East, a distance of 62.77 feet;
Thence South 89°19'38" East, a distance of 36.32 feet to the Point of Beginning.

EXHIBIT "A"
C8

Order Number: 0192-6936435
Page Number: 9

First American Title

Page 9 of 15 ends

This legal description is made pursuant to that certain Certificate Approving a Lot Line Adjustment recorded November 13, 2024 as Instrument No. 2024-0122558 of Official Records.

EXCEPTING THEREFROM:

All oil, gas and mineral rights below a depth of 500 feet from the surface, but shall preclude any right of surface entry for the purpose of drilling, mining or extraction, as reserved in the Grant Deed executed by Rolling Hills Ranch, LLC, an ArKansas limited liability company, recorded October 1, 2002 as Instrument No. 2002-351658 of Official Records.

Parcel 2:

Being all of Parcel C as described in that Grant Deed recorded December 4, 2023, Doc. No. 2023- 0128557 together with a portion of New Parcel A as described in that Grant Deed recorded December 4, 2023, Doc. No. 2023-0128565 Official Records of Contra Costa County, described as follows:

Beginning at the Easternmost point of Parcel One per a Grant Deed recorded October 27, 2017, Document No. 2017-0203296-00, said point also being distant South 89°20'17"East 2295.49 feet from a

1.25 inch iron pipe marking the West 1/4 corner of Section 34 T. 2 N, R. 2 E, M.D.B.& M.

Thence from said Point of Beginning, North 89°19'38" West, a distance of 36.32 feet; thence South 32°42'32" West, a distance of 62.77 feet; thence South 34°58'49" West, a distance of 322.26 feet to a point of intersection with the Northeasterly right-of-way line of Country Hills Drive; thence along said Northeasterly right-of-way line from a radial line which bears North 34°43'18" East, along a non-tangent curve concave to the Southwest, having a radius of 1882.00 feet, Northwesterly 466.92 feet along said curve through a central angle of 14°12'54"; thence North 69°29'36" West, a distance of 319.47 feet; thence North 69°29'38" West, a distance of 65.97 feet to a point on the Northeasterly right-of-way line of Country Hills Drive; thence along a tangent curve concave to the Northeast, having a radius of 608.00 feet, Northwesterly 340.18 feet along said curve through a central angle of 32°03'27"; thence North 37°26'11" West, a distance of 22.18 feet; thence along a tangent curve concave to the East, having a radius of 20.00 feet, Northerly 31.42 feet along said curve through a central angle of 90°00'00'' to the Southerly right-of-way line of Laurel Road; thence along said Southerly right-of-way line, North 52°33'48" East, a distance of 468.51 feet to a point of intersection with the right-of-way line of State Route 4 bypass; thence along said right-of-way line of state route 4 bypass the following 9 courses:

1. South 37°26'20" East, a distance of 0.94 feet;

2. Thence North 51°24'55" East, a distance of 98.71 feet;

3. Thence along a tangent curve concave to the Southeast, having a radius of 46.26 feet, Easterly 26.87 feet along said curve through a central angle of 33°16'51";

4. Thence South 37°26'20" East, a distance of 159.91 feet;

5. Thence along a tangent curve concave to the Northeast, having a radius of 382.24 feet, Southeasterly 194.86 feet along said curve through a central angle of 29°12'29";

6. Thence South 66°38'49" East, a distance of 288.73 feet;

7. Thence along a tangent curve concave to the Southwest, having a radius of 802.21 feet, Southeasterly 387.02 feet along said curve through a central angle of 27°38'32";

8. Thence South 09°33'50" East, a distance of 30.59 feet; C9

Order Number: 0192-6936435
Page Number: 10

First American Title

Page 10 of 15 ends

9. Thence South 33°33'13" East, a distance of 16.53 feet to the Point of Beginning.

This legal description is made pursuant to that certain certificate approving a Lot Line Adjustment recorded November 13, 2024 as Instrument No. 2024-0122558 of Official Records.

EXCEPTING THEREFROM:

Rights reserved in the deed from Christina Nena Custodio and Frank Hernandez, successor trustees of the Mary Ann Mate as Living Trust, recorded May 26, 2005, Instrument No. 2005-189176, Official Records, as follows:

All oil, gas, geothermal steam, casinghead gas, asphaltum and other hydrocarbons and chemical gas now or hereafter found, situated or located in all or any portion of the lands described herein lying more than five hundred feet (500') below the surface thereof, together with the right to slant drill for and remove all or any of said gas, oil, casinghead gas, asphaltum and other hydrocarbons or chemical gas lying below a depth of more than five hundred feet (500') below the surface thereof including the right to grant leases for all or any of said purposes, but without any right whatsoever to enter upon the surface of said lands or any portion thereof within five hundred feet (500') vertical distance below the surface thereof.

APN: 053-060-055-0, 053-060-056-8 (Parcel 1) and 053-060-057-6 (Portion of Parcels 1 and 2) and 053- 060-063-4 (Parcel 2)

C10
EXHIBIT "B1"
C11
LAUREL RANCH TOWNHOMES i JANUARY 2026

STORMWATER FACILITIES OPERATION AND MAINTENANCE PLAN
For

LAUREL RANCH TOWNHOMES
December 2025
Prepared for:

Laurel Ranch 216 Owner, LLC
Sondi Harris
[email protected]
1255 Treat Boulevard Ste 300
Walnut Creek CA 94597
Prepared by:

Wood Rodgers
Karrie Mosca
[email protected]
3875 Hopyard Road Ste 345
Pleasanton CA 94588
EXHIBIT "B2"
C12
LAUREL RANCH TOWNHOMES ii JANUARY 2026

TABLE OF CONTENTS
I. Inspection and Maintenance Log..................................................................................I II. Update to Designation of Responsible Individuals .....................................................II III. Updates, Revisions, and Errata ..................................................................................III IV. Introduction ..................................................................................................................1 IV.A. Background.....................................................................................................................................................1 IV.B. Associated Agreements.................................................................................................................................1 IV.C. Funding for and Organization of Facility Operation and Maintenance ...............................................1 IV.D. Site Description..............................................................................................................................................1 V. Designation and Training of Responsible Individuals .................................................2 V.A. Designated Contact for Operation and Maintenance..............................................................................2 V.B. Off-Hours or Emergency Contact..............................................................................................................2 V.C. Corporate Officer (authorized to execute agreements with the County) .............................................2 V.D. Initial Training of Responsible Individuals ...............................................................................................2 V.E. Ongoing Training of Responsible Individuals ..........................................................................................2 VI. Facilities to be Maintained...........................................................................................3 VI.A. Facility Descriptions......................................................................................................................................3 VI.A.1. Bioretention Facility #1 3
VI.A.2. Bioretention Facility #2 3
VI.A.3. Flow Control Basin 3
VII. Maintenance Activities.................................................................................................4 VII.A. General Maintenance Rules .........................................................................................................................4 VII.B. Maintenance Schedule...................................................................................................................................4 VII.B.1. Routine Activities 5
VII.B.2. Following Significant Rain Events 5
VII.B.3. Prior to the Start of the Rainy Season 5
VII.B.4. Annually During Winter 5
Tables
Inspection Checklist.............................................................................................................................................6 Attachments

1. Stormwater Control Plan
C13
LAUREL RANCH TOWNHOMES iii JANUARY 2026
Acronyms and Abbreviations
C.3 Provision C.3 in the Municipal Regional Stormwater Permit issued by the California Regional Water Quality Control Board for the San Francisco Bay Region
IMP Integrated Management Practice (Bioretention and Flow Control Basins) O&M Plan Operations and Maintenance Plan
C14
LAUREL RANCH TOWNHOMES I JANUARY 2026
I. INSPECTION AND MAINTENANCE LOG
Facility Name
Address
Begin Date End Date
Date IMP ID# IMP Description Inspected
by:

Cause for
Inspection
Exceptions Noted Comments and
Actions Taken
Instructions: Record all inspections and maintenance for all treatment IMPs on this form. Use additional log sheets and/or attach extended comments or documentation as necessary.
o IMP ID# — Always use ID# from the Operation and Maintenance Manual. o Inspected by — Note all inspections and maintenance on this form. o Cause for inspection — Note if the inspection is routine, pre-rainy-season, post-storm, annual, or in response to a noted problem or complaint. o Exceptions noted — Note any condition that requires correction or indicates a need for maintenance. o Comments and actions taken — Describe any maintenance done and need for follow-up.

C15
LAUREL RANCH TOWNHOMES II JANUARY 2026
II. UPDATE TO DESIGNATION OF RESPONSIBLE INDIVIDUALS
** Use this form to update the plan when responsible individuals change. ** Date Completed
Facility Name
Facility Address
Designated Contact for Operation and Maintenance
Name: Title or Position:

Telephone: Alternate Telephone:

Email:

Off-Hours or Emergency Contact
Name: Title or Position:

Telephone: Alternate Telephone:

Email:

Corporate Officer (authorized to execute contracts with the City, Town, or County) Name: Title or Position:

Address:

Telephone: Alternate Telephone:

Email:

C16
LAUREL RANCH TOWNHOMES III JANUARY 2026
III. UPDATES, REVISIONS, AND ERRATA
Date
Num. Updates, Revisions, or Errata Title Description/Purpose By (full name):

C17
LAUREL RANCH TOWNHOMES 1 JANUARY 2026
IV. INTRODUCTION
This plan addresses operation and maintenance of facilities constructed as part of the following development project:

LAUREL RANCH TOWNHOMES
The Stormwater Control Plan for this project is in Appendix A.

IV.A. Background
This Stormwater Facilities Operation and Maintenance Plan (O&M Plan) is for facilities constructed as part of the development project referenced above. Construction of these facilities was required by Provision C.3 in the Municipal Regional Stormwater Permit issued by the California Regional Water Quality Control Board for the San Francisco Bay Region. Provision C.3. also requires the City to verify ongoing operation and maintenance of stormwater treatment and hydromodification management facilities.

IV.B. Associated Agreements
This O&M Plan is referenced in an O&M Agreement between the property owner and the City. The agreement, grants the City access to the property to conduct inspections and, if needed, to perform maintenance on the facilities at the owner’s expense. The agreement also grants access for inspections to the Contra Costa Mosquito and Vector Control District (CCMVCD).

As provided in the O&M Agreement, this O&M Plan may be modified, but only with the review and consent of the City of Antioch. The official O&M Plan is the version which is on file at the City of Antioch. Any modifications made to the O&M Plan under the consent of the City must be filed at the City.

IV.C. Funding for and Organization of Facility Operation and Maintenance Proper operation and maintenance of stormwater management facilities will be the responsibility of the project owner in perpetuity.

IV.D. Site Description
The site is bounded by Laurel Road, Country Hills Drive, and Highway 4. There is an existing 36-inch drain line flowing southerly along the east side of the site which was previously constructed with the residential development on the north side of Laurel Road. The site consists of impermeable clay soils and is located on steep terrain, making it difficult to have level areas for stormwater quality. The developed site has 38 townhome buildings (216 total units) and a recreation / leasing office with pool, hot tub, and patio. Common area improvements include a playground, a dog park, retaining walls, and landscaping. Walls are used to create a level open space area for stormwater quality. The steep terrain does provide sufficient hydraulic head for a storm drain system. This site contains 3 bioretention areas. Approximately 7.7 acres on the southern side of the project (DMA 1) drains to Bioretention 1 (TCM 1) via a storm drain pipe system which collects runoff from the paved roadways and adjacent lots. Bioretention area 1 is located on the northern side of the project site, and are hydraulically connected.

Approximately 2.1 acres on the northwest side of the project (DMA 2) drains to Bioretention 2 (TCM 2), located in the northwest corner of the project site, via the on-site storm drain system. Approximately 3.8 acres on the eastern and southern sides of the project (DMA 3) drains via on-site storm drain pipes to Bioretention 3 (TCM 3), which is located on the southeastern corner of the project site. Approximately 4.0 acres on the northern side of the project (DMA 4) is self-treated and drains to the existing storm drain along the northern property line.

C18
LAUREL RANCH TOWNHOMES 2 JANUARY 2026
V. DESIGNATION AND TRAINING OF RESPONSIBLE INDIVIDUALS
V.A. Designated Contact for Operation and Maintenance
Name and Title: Charles McKeag, President
Address: Laurel Ranch 216 Owner, LLC
1255 Treat Boulevard, Suite 300
Walnut Creek, CA 94597
Contact (Email): [email protected]
V.B. Off-Hours or Emergency Contact
Name and Title: Matt Blain, VP Operations
Address:

Contact (Phone and Email) (949)
418-1144 [email protected]
V.C. Corporate Officer (authorized to execute agreements with the City) Name and Title: Charles McKeag, President
Address: Brightsky Residential
1255 Treat Boulevard, Suite 300
Walnut Creek, CA 94597
Contact (Email): [email protected]
V.D. Initial Training of Responsible Individuals
Following completion of construction, the bioretention facilities and flow control basin will be maintained by the developer for two years, except for routine policing for trash, which will be done by the owner’s personnel. During this 2-year period, the owner’s landscape maintenance crew will coordinate to meet with the developer’s personnel on-site during maintenance. At these times, the developer’s personnel will demonstrate proper maintenance procedures.

V.E. Ongoing Training of Responsible Individuals
The maintenance activity directions in Section VII below have been reviewed by applicable contract employees (engaged by the owner). All new employees are trained in special requirements for each site at which they work.

The main training messages for use are:
• No synthetic pesticides or fertilizers are to be used. • No soil amendments are to be added, except aged compost mulch. • The top of soil elevation is to be maintained at 12 inches below the overflow top of grate elevation.

Laurel Ranch 216 Owner, LLC
1255 Treat Boulevard, Suite 300
Walnut Creek, CA 94597
C19
LAUREL RANCH TOWNHOMES 3 JANUARY 2026
VI. FACILITIES TO BE MAINTAINED
VI.A. Facility Descriptions
Runoff from residential building roofs, driveways, sidewalks and all paved roadways is routed to three of the four bioretention facilities on site. See the attached Stormwater Control Plan for additional details.

VI.A.1. Bioretention Facility #1
Bioretention area #1 are located near the northeastern central portion of the project site 37°58'34.0"N 121°44'35.2"W.

VI.A.2. Bioretention Facility #2
Bioretention #2 is located in the northern corner of the project site, by the intersection of Highway 4 and Laurel Road 37°58'38.9"N 121°44'44.7"W.

VI.A.3. Bioretention Facility #3
The Bioretention #3 is located in the southern corner of the project site and is bounded by Highway 4 & Country Hills Drive 37°58'29.0"N 121°44'32.7"W.

C20
LAUREL RANCH TOWNHOMES 4 JANUARY 2026
VII. MAINTENANCE ACTIVITIES
VII.A. General Maintenance Rules
At no time will synthetic pesticides or fertilizers be applied, nor will any soil amendments, other than aged compost mulch or sand/compost mix, be introduced. The top of soil surface will be maintained at or near the design elevation throughout. Irrigation systems will be maintained to conserve water while maintaining plant health.

Although it is unlikely to be needed, if plants are not thriving compost tea may be applied at a recommended rate of 5 gallons mixed with 15 gallons of water per acre, up to once per year between March and June. Compost tea will not be applied when temperatures are below 50°F or above 90°F or when rain is forecast within the next 48 hours.

The following may be applied for pest control if needed:
• Beneficial nematodes
• Safer® products
• Neem oil
Plants may need to be replaced with the following mix as specified by the landscape architect or with similar plantings appropriate for the unique conditions.

VII.B. Maintenance Schedule
Routine Maintenance Activities for Bioretention Areas and Flow Control Basin No. Maintenance Task Frequency of Task
1 • Remove obstructions, debris, accumulated sediment
and trash from bioretention area and dispose of
properly.
• Maintain vegetation and the irrigation system. Prune
and weed to keep bioretention area neat and orderly
in appearance.

Monthly
2 • Remove and replace all dead and diseased vegetation • Till or replace soil as necessary to maintain the design elevation of soil.

Before wet season (August or
September), and
After wet season (May)
3 • Inspect bioretention area using the attached
inspection checklist.

Before wet season (inspect in
August make all corrections by
September 30), and
After wet season (May), and
Monthly during wet season
(October through April)
C21
LAUREL RANCH TOWNHOMES 5 JANUARY 2026
VII.B.1. Routine Activities
The facilities will be examined weekly for visible trash, and trash will be removed. Any graffiti, vandalism, or other damage will be noted and addressed within 48 hours.

The planted areas will be weeded by hand approximately monthly. At this time, plants will be inspected for health and the irrigation system will be turned on manually and checked for any leaks or broken lines, misdirected spray patterns etc. Any dead plants will be replaced.

VII.B.2. Following Significant Rain Events
A significant rain event will be considered to be one that produces approximately a half-inch or more rainfall in a 24-hour period. Within 24 hours after each such event, the following will be conducted:
• The surface of the facility will be observed to confirm there is no ponding. • Inlets will be inspected, and any accumulations of trash or debris will be removed. Any erosion at inlets should be restored to grade.
• The surface of the mulch layer will be inspected for movement of material. Mulch will be replaced and raked smooth if needed.
• Outlet structure will be inspected for any obstructions to assure that mulch is not washed out.

VII.B.3. Prior to the Start of the Rainy Season
In September of each year, facility inlets and outlets, including flow-control orifices will be inspected to confirm there is no accumulation of debris that would block flow. Stormwater should drain freely into the drainage facilities. If not previously addressed during monthly maintenance, any growth and spread of plantings that blocks inlets or the movement of runoff across the surface of the facility will be cut back or removed.

If the facilities are not completely drained in 24 hours, the underdrain may be clogged. Check the overflow outlet to determine if the underdrain is performing properly. There should be no filter fabric or geotextile in the horizontal layers or wrapped at the underdrain. If the underdrain is working, the bioretention media may contain fines. Replace material with mixture of 30-40% aged compost and 60-70% washed granular sand, no fines.

VII.B.4. Annually During Winter
Once, in December – February of each year, vegetation will be cut back as needed, debris removed, and plants and mulch replaced as needed. The concrete work will be inspected for damage. The elevation of the top of soil and mulch layer will be confirmed to be consistent with the 6-inch reservoir depth.

C22
LAUREL RANCH TOWNHOMES 6 JANUARY 2026
Inspection and Maintenance Checklist
Property Address: Property Owner:

Treatment Measure No.: Date of Inspection: Type of Inspection: Monthly Pre-Wet Season After heavy runoff End of Wet Season
Inspector(s): Other:

Defect Conditions When Maintenance Is
Needed
Maintenance
Needed?
(Y/N)
Comments (Describe maintenance
completed and if needed maintenance was
not conducted, note when it will be done)
Corrective Action/Results Expected When Maintenance
Is Performed

1. Standing
Water
When water stands in the
bioretention area between storms
and does not drain within four days
after rainfall; water may not flow
evenly through facility.
• Remove top 2 to 4 inches of sediment at inlets to the facility. Add biotreatment soil (Stormwater C.3 Guidebook Appendix B) to design elevation of soil (top of mulch is typically 6 inches below the overflow outlet). Rake, till, or amend with soil mix until infiltration rate is restored. Use ASTM D3385-09 to test infiltration rate.
• Install a flow spreader or regrade to distribute flow evenly.

2. Trash/Debris
Accumulation
Trash and debris accumulated in the
bioretention area.
• Trash and debris removed from bioretention area and
disposed of properly.

3. Sediment Evidence of sedimentation in
bioretention area.
• Material removed so that there is no clogging or
blockage. Material is disposed of properly.

4. Erosion Channels or ruts have formed around
inlets, there are areas of bare soil,
and/or other evidence of erosion.
• Obstructions and sediment removed so that water flows freely and disperses over a wide area. Obstructions and sediment are disposed of properly.

5. Vegetation Vegetation is dead, diseased and/or
overgrown.
• Replant in-kind or substitute from Stormwater C.3
Guidebook Appendix B plant list.
• Manually weed and prune to ensure inlets and outlets
convey water into/out of the facility. Remove plant debris.

6. Mulch Mulch is missing or patchy in
appearance. Areas of bare earth are
exposed, or mulch layer is less than
3 inches in depth.
• Replenish mulch; use aged or composted mulch.
• All bare earth is covered, except mulch is kept 6 inches away from trunks of trees and shrubs.
• Mulch is even in appearance, at a depth of 3 inches.

7. Irrigation Irrigation system is not working
properly.
• Repair as needed and confirm irrigation system works
properly.

8. Soil
shrinkage
The soil surface is more than 6”
below overflow drain).
• Add biotreatment soil mix (specified in Stormwater C.3 Guidebook Appendix B), so that soil is at proper depth
(top of mulch is typically 6 inches below the overflow
outlet).

8. Overflow
Pipe or
Outlet to
Storm Drain
Excess flows are not conveyed
safely to storm drain. Piping is
damaged or disconnected.

Mulch/debris clogs outlet to storm
drain (check inside the drain).
• Repair the overflow pipe or remove material clogging the overflow outlet, so that excess flow is conveyed
efficiently to storm drain.
• Remove any mulch, debris or obstruction that is blocking the drain, including any material inside the drain. .

C23
i' i/'
' ' ' y
t '
<.;l //_/ . ,:r f
' if / ,,-.,
//::?
/f . :,;: _,
' (' /
'.::? ,/
'/_f'
,;I.
_)'
u
BUILDING ll

DRAINAGE MANAGEMENT AREA IDMA) SUMMARY

TOTAL TOTAL IMPERVIOUS EFFECTIVE REQUIRED PROVIDED PROVIDED REQUIRED PROVIDED AREA TOTAL

DMA DRAINAGE (ROOFS AND PERVIOUS AREA IMPERVIOUS TREATMENT TREATMENT STORAGE DEPTH FLOW-CONTROL FLOW-CONTROL TREATMENT AREA PAVEMENT) {SF) AREA AREA {4%) AREA IN GRAVEL VOLUME VOLUME MEASURE ISF) ISF) !SF) {SF) LAYER (FT) !CF) ICF) (SF)
1 335,020 247,755 87,265 256,482 10,259 17952 3.33 39,777 39,783 BIORETENTION 2 91,726 49,686 42,040 53,890 2,156 6790 1.50 10,190 10,866 BIORETENTION 3 164,468 125,091 39,377 129,029 5,161 13655 1.25 19,661 20,483 BIORETENTION 4 175,440 0 175,440 SELF-TREATING
NOTES:

1. ALL TREATMENT MEASURES AND TECHNICAL REQUIREMENTS FOR THIS PROJECT ARE BASED ON THE CONTRA COSTA CLEAN WATER PROGRAM C.3 GUIDEBOOK, 7TH EDITION

2. REQUIRED TREATMENT AREA WAS CALCULATED USING THE CONTRA COSTA CLEAN WATER PROGRAM IMP SIZING TOOL SOFTWARE. ~ .....
""' .... ~- HJGHWAY LJ
--------------------------
8UJLDJNG25
"' ·.,,;.,
' 'I

1. c.,--.-/-,:,,1,
z 9--j,p...j
:::,--'-l-,'lll!;
co
-----
I
.· ' '. -,..,._-'; ---.:
-:""'-
BUILDING 28
I
-ACC ACC ...
----
I
BUILDING 31
I
-
I
I
I '
I
.,
' I
-ACC· o1·
-----
DMA 4
ACC
" I. , .. - ~
~-- 's,--
- ,.,.,,,.,t,
I
I
~1· ... ·
0 °' ?g:_ , <.:)
~-h t
z ·"" -o <( _, C
I 3 ,. o--co 5
I '° I
ACC.
-. ;_(?{"
co.:~1:T .. ~~~ .. fll~j3~ ~~~~~:1•,•1Jr4s"sif:?,····;;;;5 ,k~ ·,,,'~:i;·· •• {·;· ::··, .. "··· . ... . ... ..,... • •••• ,;,,.p -.. ..... ,, ,. ,,: • y; .,,;,,, ; )C<M>,Jj ::-~eW,~,·.c;-),,/'jc: 'jt;_,; (;\,,'.ii",,,,,<~ .':.•t ' 4); .;"' .

CJ
D
X
... - -
II
•
LEGEND

ASPHALT PAVING

BIORETENTION

OMA BOUNDARY

DRAIN INLET

STORM DRAIN MANHOLE
• ··-<;=~~ '••, .
• ·~.so,,;.0'~ , : . . . 'j-- ~i /. ,, ,:-::~.~~- = •
••• ~. ···· .... ·.·.·· .... ·~ .. , ~
OVERFLOW RISER PLACE 4" MIN. DIA.

NOYD COBBLE
; ;
.J: 7 ~ BIORE1;t~10N FINISHEBY 'N s.' "'"'l-
..__,_J,GR!RA~D~E3I'.§8l1QO,JF'!,Gl.,._~,:c· •• '-,,-_j..__.)._ _ _(_ _ _:1,~~_:;;,;;.?,..J:;;~tJ:!..---,,.--

IMPERMEABLE LINER
18" MIN BIO RETENTION

SOIL MIX
£ • -. '.,' "''' "":.{\.)'~--/( '.:~~S,j~"·-1~1, IMPERMEABLE LINER CLASS 2 VIRGIN ~--t:'R''

PERMEABLE MATERIAL PER

CALTRANS SPECIFICATIONS
SECTION 68 PER DMA

SUMMARY
-I-F,:r·.1

NATIVE SOIL
IMPERMEABLE LINER 4" PERFORATED UNDERDRAIN
(PERFORATIONS FACING DOWN)
BIORETENTION BASIN DETAIL (TCM 2)
NTS
<·7
-~
CLASS 2 VIRGIN

PERMEABLE MATERIAL PER

CALTRANS SPECIFICATIONS
SECTION 68 PER DMA

SUMMARY

IMPERMEABLE LINER

RETAINING WALL
(BY OTHERS)

FOOTING
(BY OTHERS)

OVERFLOW RISER
·<<.::
. ,; •J_. •
~. ••·. I .

BIORE:t{t,ij10N FINISHED:,',¾
RADE£,ttfo FG :r-
NATIVE SOIL z i
'lo ::. lo b ...

IMPERMEABLE LINER
PLACE 4" MIN. DIA.

NOYD COBBLE
ClrANOUT \ :j ; u :·
'lo ~ ::.
18'' MIN BIORETENTION

SOIL MIX

IMPERMEABLE LINER

RETAINING WALL
(BY OTHERS)

FOOTING
(BY OTHERS)
4" PERFORATED UNDERDRAIN
(PERFORATIONS FACING DOWN)
BIORETENTION BASIN DETAIL (TCM 1 & 3)
NTS
J
'
o· 30' 60' 120'
SCALE: 1" =60'
TCM 3
J

IJJOOO -RODGERS
Know what's below.

Call 811 before you dig. DATE: 10/08/2024
'" t3
':;'c Cl ~
Cl~ 0
11-+-t--,>-i---+--+--t :J: I
,,,z ,.. :s:
(ii~ 0
~ I
I
i---,f--+-+-+-+-1-'--1u
['§ c ~
~~Ck'.'.
l-i-1--,f-i-t-+--I-' w
Ck:'.
:::::,
::S
ci z
<(
z [:l > ~ ::, 0::
... 0 c3 "'
0 0:: 0 --' z
"' ~
0 ~ 0
ti, 0 0::
"' z vi :::, II u 0 :::, ' -<( ;.: iii I [D
;.:
[D 0 0 w
'" w z z "' '"
_;
~ " u
\;'
<( in '" u "' w I
0 V) 0 0 0
~~ "' " ill ill ill ill
[[i
" l'
w~
'< '<
(D (D
w ill ill
Cl~
NN
{J) {J)
0~
a >< w ~
f- Le z
□~
(D
"' (D
q:~
st ill
" '<
~ {J)
z [I] <(
0~
ci 0
"' .
aZ
□ g °' D <( f-
>-z
□~
~ <(
I [JJ
"' <(
3~
" w OJ .J
" 0.
0 <(
C
-00
z
0 u
O:'. N
0 • " LL ~
·c
_J 'O
0 <(
"' u 0
z i'=
'i"
0 u
<( z ::,
::J .,:

V) ......1 0 ..
0 w CL u 0
~ ......1 ~ ..

N
(J) 0
0 0
N
0 '-<O
O:::'. u
" :r:
0 I- <(
(J) z
O:'.
~
z • I- 'O
z~ 0
z cj
0 °'
~
~o
u I
u
0 n.
\E I- I-- >-
V)
z I
~ :r: I-- '° ......1 '.:>-
~u
00 <(
C
0 ~z
0::
:::::> c
~ <( •
0 E
~
O:::'. 2
O:::'.

0. E
.....J w ?
~
w
~
• ;3-
O:::'. ~
:::::> ~
'.:>-
-C
<( •
~
E

0. .....J
0 ..

O:::'. I >
• u 0
0 0 00
I-
,::

I--
I
z
"' V) <( c
" LL 0
u
0 "' i'=
'O
0 0
°' u 1'
" PERMIT NO. 0
7 82023-2418 ~
u
:8 PROJECT NO.

C
.,:
3717.009 ~
u
C

DRAWING
0 "' ..

C
C5.1 " 0
_;I
... r:: "' /'
00 "'
SHT 22 OF 56
0 ?
~
C24
Order Number: 0192-6936435
Page Number: 8
First American Title

Page 8 of 15 ends

LEGAL DESCRIPTION
Real property in the City of Antioch , County of Contra costa, State of California, described as follows:

Parcel 1:

Being a portion of New Parcel A per that Grant Deed recorded December 4, 2023, Doc. No. 2023- 0128565, contra Costa County Records, described as follows:

Beginning at the Easternmost point of Parcel One per a Grant Deed recorded October 27, 2017, Document No. 2017-0203296-00, said point also being distant South 89°20'17" East 2295.49 feet from a

1.25 inch iron pipe marking the West 1/4 corner of Section 34 T. 2 N, R. 2 E, M.D.B.&M.

Thence from said Point of Beginning, along the Southwesterly right-of-way line of state route 4 bypass the following 6 courses:

1. South 33°37'39" East, a distance of 87.40 feet;

2. Thence South 34°16'05" East, a distance of 224.05 feet;

3. Thence South 29°50'54" East, a distance of 354.69 feet;

4. Thence South 29°51'01" East, a distance of 159.64 feet;

5. Thence North 60°07'06" East, a distance of 14.95 feet;

ATTACHMENT "D"
D1

Order Number: 0192-6936435
Page Number: 9

First American Title

Page 9 of 15 ends

This legal description is made pursuant to that certain Certificate Approving a Lot Line Adjustment recorded November 13, 2024 as Instrument No. 2024-0122558 of Official Records.

EXCEPTING THEREFROM:

Parcel 2:

Beginning at the Easternmost point of Parcel One per a Grant Deed recorded October 27, 2017, Document No. 2017-0203296-00, said point also being distant South 89°20'17"East 2295.49 feet from a

1.25 inch iron pipe marking the West 1/4 corner of Section 34 T. 2 N, R. 2 E, M.D.B.& M.

1. South 37°26'20" East, a distance of 0.94 feet;

2. Thence North 51°24'55" East, a distance of 98.71 feet;

3. Thence along a tangent curve concave to the Southeast, having a radius of 46.26 feet, Easterly 26.87 feet along said curve through a central angle of 33°16'51";

4. Thence South 37°26'20" East, a distance of 159.91 feet;

5. Thence along a tangent curve concave to the Northeast, having a radius of 382.24 feet, Southeasterly 194.86 feet along said curve through a central angle of 29°12'29";

6. Thence South 66°38'49" East, a distance of 288.73 feet;

7. Thence along a tangent curve concave to the Southwest, having a radius of 802.21 feet, Southeasterly 387.02 feet along said curve through a central angle of 27°38'32";

8. Thence South 09°33'50" East, a distance of 30.59 feet; D2
Order Number: 0192-6936435
Page Number: 10
First American Title

Page 10 of 15 ends

9. Thence South 33°33'13" East, a distance of 16.53 feet to the Point of Beginning.

This legal description is made pursuant to that certain certificate approving a Lot Line Adjustment recorded November 13, 2024 as Instrument No. 2024-0122558 of Official Records.

EXCEPTING THEREFROM:

APN: 053-060-055-0, 053-060-056-8 (Parcel 1) and 053-060-057-6 (Portion of Parcels 1 and 2) and 053- 060-063-4 (Parcel 2)
D3
LAUREL RANCH TOWNHOMES i JANUARY 2026

STORMWATER FACILITIES OPERATION AND MAINTENANCE PLAN
For

LAUREL RANCH TOWNHOMES
December 2025
Prepared for:

Laurel Ranch 216 Owner, LLC
Sondi Harris
[email protected]
1255 Treat Boulevard Ste 300
Walnut Creek CA 94597
Prepared by:

Wood Rodgers
Karrie Mosca
[email protected]
3875 Hopyard Road Ste 345
Pleasanton CA 94588
ATTACHMENT "E"
E1
LAUREL RANCH TOWNHOMES ii JANUARY 2026

1. Stormwater Control Plan
E2
LAUREL RANCH TOWNHOMES iii JANUARY 2026
Acronyms and Abbreviations
C.3 Provision C.3 in the Municipal Regional Stormwater Permit issued by the California Regional Water Quality Control Board for the San Francisco Bay Region
IMP Integrated Management Practice (Bioretention and Flow Control Basins) O&M Plan Operations and Maintenance Plan
E3
LAUREL RANCH TOWNHOMES I JANUARY 2026
I. INSPECTION AND MAINTENANCE LOG
Facility Name
Address
Begin Date End Date
Date IMP ID# IMP Description Inspected
by:

E4
LAUREL RANCH TOWNHOMES II JANUARY 2026
II. UPDATE TO DESIGNATION OF RESPONSIBLE INDIVIDUALS
** Use this form to update the plan when responsible individuals change. ** Date Completed
Facility Name
Facility Address
Designated Contact for Operation and Maintenance
Name: Title or Position:

Telephone: Alternate Telephone:

Email:

Off-Hours or Emergency Contact
Name: Title or Position:

Telephone: Alternate Telephone:

Email:

Corporate Officer (authorized to execute contracts with the City, Town, or County) Name: Title or Position:

Address:

Telephone: Alternate Telephone:

Email:

E5
LAUREL RANCH TOWNHOMES III JANUARY 2026
III. UPDATES, REVISIONS, AND ERRATA
Date
Num. Updates, Revisions, or Errata Title Description/Purpose By (full name):

E6
LAUREL RANCH TOWNHOMES 1 JANUARY 2026
IV. INTRODUCTION
This plan addresses operation and maintenance of facilities constructed as part of the following development project:

LAUREL RANCH TOWNHOMES
The Stormwater Control Plan for this project is in Appendix A.

E7
LAUREL RANCH TOWNHOMES 2 JANUARY 2026
V. DESIGNATION AND TRAINING OF RESPONSIBLE INDIVIDUALS
V.A. Designated Contact for Operation and Maintenance
Name and Title: Charles McKeag, President
Address: Laurel Ranch 216 Owner, LLC
1255 Treat Boulevard, Suite 300
Walnut Creek, CA 94597
Contact (Email): [email protected]
V.B. Off-Hours or Emergency Contact
Name and Title: Matt Blain, VP Operations
Address:

Laurel Ranch 216 Owner, LLC
1255 Treat Boulevard, Suite 300
Walnut Creek, CA 94597
E8
LAUREL RANCH TOWNHOMES 3 JANUARY 2026
VI. FACILITIES TO BE MAINTAINED
VI.A. Facility Descriptions
Runoff from residential building roofs, driveways, sidewalks and all paved roadways is routed to three of the four bioretention facilities on site. See the attached Stormwater Control Plan for additional details.

VI.A.1. Bioretention Facility #1
Bioretention area #1 are located near the northeastern central portion of the project site 37°58'34.0"N 121°44'35.2"W.

VI.A.2. Bioretention Facility #2
Bioretention #2 is located in the northern corner of the project site, by the intersection of Highway 4 and Laurel Road 37°58'38.9"N 121°44'44.7"W.

VI.A.3. Bioretention Facility #3
The Bioretention #3 is located in the southern corner of the project site and is bounded by Highway 4 & Country Hills Drive 37°58'29.0"N 121°44'32.7"W.

E9
LAUREL RANCH TOWNHOMES 4 JANUARY 2026
VII. MAINTENANCE ACTIVITIES
VII.A. General Maintenance Rules
At no time will synthetic pesticides or fertilizers be applied, nor will any soil amendments, other than aged compost mulch or sand/compost mix, be introduced. The top of soil surface will be maintained at or near the design elevation throughout. Irrigation systems will be maintained to conserve water while maintaining plant health.

Monthly
2 • Remove and replace all dead and diseased vegetation • Till or replace soil as necessary to maintain the design elevation of soil.

Before wet season (August or
September), and
After wet season (May)
3 • Inspect bioretention area using the attached
inspection checklist.

Before wet season (inspect in
August make all corrections by
September 30), and
After wet season (May), and
Monthly during wet season
(October through April)
E10
LAUREL RANCH TOWNHOMES 5 JANUARY 2026
VII.B.1. Routine Activities
The facilities will be examined weekly for visible trash, and trash will be removed. Any graffiti, vandalism, or other damage will be noted and addressed within 48 hours.

E11
LAUREL RANCH TOWNHOMES 6 JANUARY 2026
Inspection and Maintenance Checklist
Property Address: Property Owner:

Treatment Measure No.: Date of Inspection: Type of Inspection: Monthly Pre-Wet Season After heavy runoff End of Wet Season
Inspector(s): Other:

2. Trash/Debris
Accumulation
Trash and debris accumulated in the
bioretention area.
• Trash and debris removed from bioretention area and
disposed of properly.

3. Sediment Evidence of sedimentation in
bioretention area.
• Material removed so that there is no clogging or
blockage. Material is disposed of properly.

7. Irrigation Irrigation system is not working
properly.
• Repair as needed and confirm irrigation system works
properly.

8. Overflow
Pipe or
Outlet to
Storm Drain
Excess flows are not conveyed
safely to storm drain. Piping is
damaged or disconnected.

E12
i' i/'
' ' ' y
t '
<.;l //_/ . ,:r f
' if / ,,-.,
//::?
/f . :,;: _,
' (' /
'.::? ,/
'/_f'
,;I.
_)'
u
BUILDING ll

DRAINAGE MANAGEMENT AREA IDMA) SUMMARY

TOTAL TOTAL IMPERVIOUS EFFECTIVE REQUIRED PROVIDED PROVIDED REQUIRED PROVIDED AREA TOTAL

1. ALL TREATMENT MEASURES AND TECHNICAL REQUIREMENTS FOR THIS PROJECT ARE BASED ON THE CONTRA COSTA CLEAN WATER PROGRAM C.3 GUIDEBOOK, 7TH EDITION

2. REQUIRED TREATMENT AREA WAS CALCULATED USING THE CONTRA COSTA CLEAN WATER PROGRAM IMP SIZING TOOL SOFTWARE. ~ .....
""' .... ~- HJGHWAY LJ
--------------------------
8UJLDJNG25
"' ·.,,;.,
' 'I

CJ
D
X
... - -
II
•
LEGEND

ASPHALT PAVING

BIORETENTION

OMA BOUNDARY

DRAIN INLET

STORM DRAIN MANHOLE
• ··-<;=~~ '••, .
• ·~.so,,;.0'~ , : . . . 'j-- ~i /. ,, ,:-::~.~~- = •
••• ~. ···· .... ·.·.·· .... ·~ .. , ~
OVERFLOW RISER PLACE 4" MIN. DIA.

NOYD COBBLE
; ;
.J: 7 ~ BIORE1;t~10N FINISHEBY 'N s.' "'"'l-
..__,_J,GR!RA~D~E3I'.§8l1QO,JF'!,Gl.,._~,:c· •• '-,,-_j..__.)._ _ _(_ _ _:1,~~_:;;,;;.?,..J:;;~tJ:!..---,,.--

IMPERMEABLE LINER
18" MIN BIO RETENTION

SOIL MIX
£ • -. '.,' "''' "":.{\.)'~--/( '.:~~S,j~"·-1~1, IMPERMEABLE LINER CLASS 2 VIRGIN ~--t:'R''

PERMEABLE MATERIAL PER

CALTRANS SPECIFICATIONS
SECTION 68 PER DMA

SUMMARY
-I-F,:r·.1

NATIVE SOIL
IMPERMEABLE LINER 4" PERFORATED UNDERDRAIN
(PERFORATIONS FACING DOWN)
BIORETENTION BASIN DETAIL (TCM 2)
NTS
<·7
-~
CLASS 2 VIRGIN

PERMEABLE MATERIAL PER

CALTRANS SPECIFICATIONS
SECTION 68 PER DMA

SUMMARY

IMPERMEABLE LINER

RETAINING WALL
(BY OTHERS)

FOOTING
(BY OTHERS)

OVERFLOW RISER
·<<.::
. ,; •J_. •
~. ••·. I .

BIORE:t{t,ij10N FINISHED:,',¾
RADE£,ttfo FG :r-
NATIVE SOIL z i
'lo ::. lo b ...

IMPERMEABLE LINER
PLACE 4" MIN. DIA.

NOYD COBBLE
ClrANOUT \ :j ; u :·
'lo ~ ::.
18'' MIN BIORETENTION

SOIL MIX

IMPERMEABLE LINER

RETAINING WALL
(BY OTHERS)

FOOTING
(BY OTHERS)
4" PERFORATED UNDERDRAIN
(PERFORATIONS FACING DOWN)
BIORETENTION BASIN DETAIL (TCM 1 & 3)
NTS
J
'
o· 30' 60' 120'
SCALE: 1" =60'
TCM 3
J

IJJOOO -RODGERS
Know what's below.

V) ......1 0 ..
0 w CL u 0
~ ......1 ~ ..

0. E
.....J w ?
~
w
~
• ;3-
O:::'. ~
:::::> ~
'.:>-
-C
<( •
~
E

0. .....J
0 ..

O:::'. I >
• u 0
0 0 00
I-
,::

I--
I
z
"' V) <( c
" LL 0
u
0 "' i'=
'O
0 0
°' u 1'
" PERMIT NO. 0
7 82023-2418 ~
u
:8 PROJECT NO.

C
.,:
3717.009 ~
u
C

DRAWING
0 "' ..

C
C5.1 " 0
_;I
... r:: "' /'
00 "'
SHT 22 OF 56
0 ?
~
E13
S
Agenda Item #
S

TAFF REPORT TO THE CITY COUNCIL
DAT
E: Regular Meeting of June 9, 2026
T
O: Honorable Mayor and Members of the City Council
S
UBMITTED BY: Monserrat Cabral, Public Safety & Community Resources Director A
PPROVED BY: Ana Cortez, Acting City Manager AEC
S
UBJECT: Resolution Adopting the Contra Costa County
Homeless Encampment Action Protocol and
Authorizing Participation in the Countywide Coordinated Encampment Response Framework
RE

COMMENDED ACTION
It is recommended that the City Council adopt a resolution accepting the Contra Costa County Homeless Encampment Action Protocol a nd authorizing participation in the countywide coordinated encampment response framework.

ISCAL IMPACT
No impact as a result of adopting the protocols. There may be future costs for participation in coordinated encampment responses, and if so, a budget request will be brought back to Council for approval.

DISCUSSION
Homelessness and unsheltered encampments continue to present complex public health, safety, environmental, and humanitarian challenges throughout Contra Costa County, including within the City of Antioch. As housing affordability pressures and regional homelessness trends continue impacting communities across California, local jurisdictions are increasingly working through coordinated regional partnerships to improve outreach, service delivery, encampment response coordination, and long-term housing stabilization efforts.

T
he City of Antioch is an active participant in the Contra Costa County regional homelessness response system, including the Contra Costa Continuum of Care (CoC) and Countywide housing and homelessness coordination efforts. Through these partnerships, Antioch collaborates with Contra Costa County, neighboring jurisdictions,

Antioch City Council
June 9, 2026 Agenda Item# S 2

homeless outreach providers, housing partners, and community-based organizations to support coordinated approaches related to homelessness outreach, shelter access,

housing navigation, encampment response, and supportive services.

As part of these ongoing regional coordination efforts, Contra Costa County developed the Homeless Encampment Action Protocol to establish a standardized framework intended to guide municipalities, public agencies, and partner organizations in responding to homeless encampments in a coordinated, safe, consistent, and service- oriented manner throughout the County.

The City of Antioch continues to experience ongoing challenges related to unsheltered homelessness encampment activity throughout the city , including public health concerns, environmental hazards, illegal dumping, fire risk, waterway impacts, infrastructure concerns, and broader community impacts. Encampment activity requires coordinated responses involving public safety personnel, public works operations, code enforcement activities, environmental mitigation efforts, homeless outreach teams, behavioral he alth providers, County service partners and State agencies such as Caltrans.

For many years, Antioch has participated in regional homelessness coordination efforts intended to improve collaboration between local jurisdictions, County agencies, and homelessness service systems. These efforts are designed to strengthen coordinated outreach practices, improve access to housing and supportive services, enhance regional communication, and support more consistent encampment response procedures throughout Contra Costa County.

As part of this regional framework, the City participates in coordinated Countywide efforts related to homelessness outreach, encampment response, coordinated entry services, housing navigation, shelter access, supportive services, and long- term housing stabilization. These efforts are coordinated in partnership with Contra Costa County Homelessness and Housing Services (H3), Coordinated Outreach Referral, Engagement and Services (CORE), law enforcement agencies, municipalities, behavioral health providers, community-based organizations, and regional housing partners.

The Contra Costa County Homeless Encampment Action Protocol establishes a Countywide framework intended to guide municipalities, special districts, public agencies, and partner organizations in identifying, assessing, responding to, coordinating outreach for, and addressing homeless encampments throughout Contra Costa County. The protocol reflects evolving regional best practices intended to balance public health and safety considerations with compassionate, service -oriented outreach and engagement strategi es. It is also aligned to guidelines adopted by the State of California for encampment resolution.

The protocol outlines recommended procedures related to outreach coordination, encampment assessment, safety considerations, coordinated engagement with Antioch City Council
June 9, 2026 Agenda Item# S 3
hom
eless outreach teams, notice and documentation procedures, cleanup coordination, hazardous waste mitigation, interagency communication, and ongoing prevention strategies. The framework also emphasizes the importance of coordinated outreach and engagement efforts prior to encampment removal activities whenever feasible.

A
central component of the protocol is coordination with County -supported CORE outreach teams and homelessness service providers to support direct engagement efforts and help connect unsheltered individuals with shelter opportunities, coordinated entry ass essments, housing navigation services, behavioral health support, case management resources, and other supportive services designed to promote long- term housing stabilization whenever possible.

A
cceptance of this protocol represents an important step toward strengthening a more coordinated, consistent, and regionally aligned encampment response framework within the City of Antioch. Acceptance also demonstrates the City’s continued participation i n Countywide homelessness coordination efforts and alignment with regional and state operational standards and best practices associated with homelessness response and encampment management.

I
t is important to note that this action represents acceptance of the Countywide protocol framework only. Additional operational development, policy refinement, interdepartmental coordination, legal review, training, and implementation planning will still be necessary to establish comprehensive city -specific procedures tailored to Antioch’s operational structure, staffing capacity, enforcement considerations, service delivery model, and community needs.

T
he City will continue working toward development of a more detailed internal encampment response protocol specific to Antioch operations, including ongoing coordination and operational planning among the following departments, divisions, and external partners:
• Antioch Police Department
• Public Works Department
• Code Enforcement Division
• Environmental and public health partners
• Homeless outreach and service providers
• Contra Costa County agencies and regional partners
• Additional City operational divisions as needed
The City recognizes that encampment response efforts require careful balancing of public health, environmental protection, community safety, legal compliance, and compassionate outreach practices that prioritize engagement, housing stabilization, and connection to supportive services whenever feasible.

ATTACHMENTS
A. Resolution
B. Contra Costa County Encampment Protocol
ATTACHMENT “A”

RESOLUTION NO. 2026/xxx

RESOLUTION OF THE CITY COUNCIL OF THE CITY OF ANTIOCH

ADOPTING THE CONTRA COSTA COUNTY HOMELESS ENCAMPMENT ACTION

PROTOCOL AND AUTHORIZING PARTICIPATION IN THE COUNTYWIDE

COORDINATED ENCAMPMENT RESPONSE FRAMEWORK

WHEREAS, homelessness and unsheltered encampments continue to present complex public health, safety, environmental, and humanitarian challenges throughout Contra Costa County, including within the City of Antioch; and

WHEREAS, housing affordability pressures, behavioral health challenges, economic instability, and regional homelessness trends continue impacting communities throughout California and Contra Costa County; and

WHEREAS, the City of Antioch participates in the Contra Costa County regional homelessness response system, including the Contra Costa Continuum of Care (CoC) and Countywide housing and homelessness coordination efforts intended to support regional collaboration r elated to homelessness outreach, housing navigation, shelter access, supportive services, and encampment response activities; and

WHEREAS, the Continuum of Care (CoC) model was established through the United States Department of Housing and Urban Development (HUD) to support coordinated regional approaches to homelessness response, housing stabilization, service coordination, and federal homelessness program administration; and

WHEREAS, the Contra Costa Continuum of Care serves as the federally recognized regional homelessness coordination and planning body for Contra Costa County and includes participation from local municipalities, County departments, housing partners, behavioral healt h agencies, homeless service providers, nonprofit organizations, and community stakeholders; and

WHEREAS, the City of Antioch works collaboratively with Contra Costa County Homelessness and Housing Services (H3), Coordinated Outreach Referral, Engagement and Services (CORE), local municipalities, behavioral health providers, homeless outreach teams, housing partners, and community -based organizations to support coordinated homelessness response efforts throughout the region; and

WHEREAS, Contra Costa County developed the Homeless Encampment Action Protocol to establish a standardized Countywide framework intended to guide municipalities, public agencies, special districts, and partner organizations in identifying, assessing, responding to, coordinating outreach for, and addressing homeless encampments in a coordinated, safe, consistent, and service-oriented manner; and

RESOLUTION NO. 2026/***
June 9, 2026

Page 2 ends

WHEREAS, the Contra Costa County Homeless Encampment Action Protocol outlines recommended procedures related to outreach coordination, notice procedures, safety considerations, hazardous waste mitigation, cleanup coordination, interagency communication, and coordi nated engagement efforts intended to connect unsheltered individuals with shelter opportunities, housing navigation, supportive services, behavioral health resources, and coordinated entry systems whenever feasible; and

WHEREAS, the City of Antioch recognizes that encampment response efforts require careful balancing of public health, environmental protection, community safety, legal compliance, operational considerations, and compassionate outreach practices intended to prioritize engagement and housing stabilization whenever possible; and

WHEREAS, acceptance of the Countywide protocol framework does not establish final City operational procedures and additional interdepartmental coordination, policy development, legal review, operational planning, and implementation activities will still be necessary to develop comprehensive city -specific encampment response practices tailored to Antioch’s operational needs and service delivery model.

NOW, THEREFORE, BE IT RESOLVED that the City Council of the City of Antioch hereby adopts the Contra Costa County Homeless Encampment Action Protocol as a Countywide coordination framework intended to support collaborative, consistent, and service-oriented encampment response efforts throughout Contra Costa County and authorizes City of Antioch participation in the countywide coordinated encampment response framework.

* * * * * * * * *

I HEREBY CERTIFY that the foregoing resolution was passed and adopted by the City Council of the City of Antioch at a regular meeting thereof, held on the 9th day of June 2026, by the following vote:

AYES:

NOES:

ABSTAIN:

ABSENT:

__________________________________
MICHAEL J. MANDY

CITY CLERK OF THE CITY OF ANTIOCH

Page 1 of 3 ends

CONTRA COSTA COUNTY

HOMELESS ENCAMPMENT ACTION PROTOCOL
Updated 10/1/2024

PURPOSE
The purpose of the Homeless Encampment Action protocol is to develop a standard process for municipalities and special districts to identify, respond to, and remove homeless encampments within Contra Costa County. The procedures set forth in this document are intended to facilitate the removal of encampments while supporting the relocation of the encampment inhabitants into shelters.

PROCEDURES

1. Any entity responding to a report of, or discovering a homeless encampment, will identify any immediate hazard to be addressed. Document with photographs whenever possible.

An “immediate hazard” is an imminent threat to the health or safety of the homeless or the community, e.g. a fire, and its removal is exempted from the 72-hour time requirement.

2. Notify the County’s Health, Housing and Homeless Services CORE outreach teams via form immediately upon becoming aware of any encampment. If no response is received within 24 hours, the Coordinated Entry (CE) System Manager can be contacted at (925) 608-6700 or [email protected].

3. The CORE Manager will send the CORE Team to the identified site as soon as practical to find and offer alternative housing and services to any inhabitants. It is desirable that individuals either move into services or vacate the area on their own and remove their own belongings.

4. After the CORE Team has visited the site, the team will contact the notifying jurisdiction of the situation and provide any relevant information.

5. The responsible jurisdiction will arrange to have the encampment posted with the vacate demand. It is encouraged that the posting provides a minimum of 72 hours’ notice for inhabitants to relocate, be printed in multiple languages as appropriate for the area, and includes the date, time and location of posting. Any “immediate hazard” to health and safety identified is exempted from the 72-hour posting time recommendation.

6. After posting, and up to two hours prior to the time expiration, the CORE Teams will continue to go out to assist individuals to find housing and other services.

7. After expiration of the notice, the encampment may be removed after the following is completed:

a. Conduct a quick field review of the encampment (i.e., look around at the items which are in plain view).
b. Take sufficient photographs, notes, or otherwise document the condition and extent of area covered by the encampment.

ATTACHMENT "B": ENCAMPMENT PROTOCOL

Page 2 of 3 ends

8. Each agency with jurisdiction is encouraged to keep a record of the date, time and location of the removal of a homeless encampment.

9. During removal of the encampment, if any of the following types of items are apparent, reasonably safe and not a sanitary hazard, they should be held by the appropriate maintenance yard for a minimum of 30 days prior to disposal. Items stored may include but are not limited to the following:

Watches

Medication

Eyeglasses
Jewelry

Personal
photographs

Personal records

10. The location where the above belongings are stored shall be posted at the encampment site.

11. Anything stored from a location can be kept in one box/container that is marked with the date, time and location of the removal. Possessions are to be released to persons who can identify them in accordance with each agency’s policy.

12. Persons illegally trespassing or lodging may be arrested immediately. However, normally law enforcement personnel will only make arrests if someone refuses to leave or is suspected of committing a criminal offense.

13. The property owner is responsible for cleaning up and making safe the area of the encampment. This will include cleaning any hazardous waste found in the area and repairing or replacing items such as fencing.

14. Individuals assigned to remove the encampment should take appropriate safety precautions in the course of the work.

15. If necessary, request the County Health Department’s Environmental Health Services to inspect and report on issues involving the protections of the homeless and workers during encampment removal, including hazardous waste.

16. It is the policy not to permit the re-establishment of encampments once they have been removed through this procedure. This will include the following activities:

a. After encampment removal, the area will be posted with signs saying “No Camping” or “No Trespassing” and include the telephone number of the CE information and referral hotline – 211.
b. The agency with jurisdiction will provide routine patrol of the areas to prevent the formation of an encampment.

Page 3 of 3 ends

17. Any citizen who would like to report an encampment should be directed to contact their local police department non-emergency number.

Any questions regarding this protocol may be directed to the Coordinated Entry System Manager at [email protected]

Form to notify CORE mobile outreach of encampment

CITY OF

ANTIOCH

CALIFORNIA

STAFF REPORT TO THE CITY COUNCIL
DATE: Regular Meeting of June 9th, 2026
TO: Honorable Mayor and Members of the City Council
SUBMITTED BY: Jorge Rojas Jr, City Treasurer ft
SUBJECT: Statement of Investment Policy

RECO MENDED ACTIO N
·It is recommended that the City Council adopt a r,esolution approving the Statement of nvestment Policy.

FISCAL IMPACT
There is no fiscal impact of this action.

DISCUSSION
State law requires that cities adopt investment guidelines and the City's investment policy further requires that the City Treasurer render the policy to City Council for review when any changes are made, or at least every two years. The existing policy was last updated and approved by City Council in June 2024. The policy was provided to the City's investment advisors, PFM, for review to ensure it is in compliance with current government codes. PFM has proposed changes to update our policy with current government code provisions that the Finance Director and City Treasurer have reviewed and concur with. It is recommended City Council adopt the resolution approving the policy. See Exhibit 1 to Attachment A for the policy with changes redlined on the document.

ATTACHMENTS
A. Resolution of the City Council of the City of Antioch Approving the Statement of Investment Policy.

Exhibit 1 - Statement of Investment Policy
T
6/9/2026
RESOLUTION NO. 2026/**

RESOLUTION OF THE CITY COUNCIL OF THE CITY OF ANTIOCH APPROVING

THE STATEMENT OF INVESTMENT POLICY
WHEREAS, California Government Code sections 53600 et seq. allow a city to make investments with money not required for immediate needs, but limits the kinds of investments that a city can make ; and
WHEREAS, when investing , State law requires that the primary objective of a trustee shall be to safeguard the principal of the funds under its control ; the secondary objective shall be to meet the liquidity needs of the depositor ; and the third objective shall be to achieve a return on the funds under its control.

NOW, THEREFORE, BE IT RESOLVED, that the City Council of the City of Antioch hereby approves the Statement of Investment Policy, as attached hereto as Exhibit 1.
* * * * * * * * * * * * *
I HEREBY CERTIFY that the foregoing resolution was passed and adopted by the City Council of the City of Antioch at a regular meeting thereof , held on the 9th day of June 2026 , by the following vote:

AYES:

NOES:

ABSTAIN:

ABSENT:

MICHAEL J MANDY

CITY CLERK OF THE CITY OF ANTIOCH
I. INTRODUCTION

CITY OF ANTIOCH

STATEMENT OF INVESTMENT POLICY
EXHIBIT 1
The purpose of this document is to identify various policies and procedure s that enhance opportun ities for a prudent and systematic investment process. The initial step toward a prudent investment policy is to organize and formalize investme nt related activ ities. Related activities which comprise good cash management include accurate cash projection , the expeditiou s collection of revenue, the control of disbursements , cost effective banking relations, and a short term borrowing program which coordinates working capita l requirements and investment opportunity. In concert with these requirement s are the many facets of an appropriate and secure short term investment program.

H. OBJECTfVES
A. Safety of principal is the foremost objective of the City, followed by liquidity and yield. Each investment transact ion shall seek to first ensure that capita l losses are avoided , whether they are from securities defaults or erosion of market value.

B. investm ent decisions should not incur unreasonab le investment risks in order to obtain current investment income.

C. The City's investment portfolio will rema in sufficiently liquid to enable the City to meet all operating requirements whic h might be reasonably anticipated . This need for investment liquidity may be tempered to the extent that the City is able to issue short term notes to meet its operating requirements.

D. The investment portfo lio shall be managed to attain a market average rate of return throughou t budgetary and eco nomic cyc les, taking into account the City's investment risk constraints and cash flow requirements, and state and loca l law, ordinance s or resolution s that restrict the placemen t of short term funds.

E. Portfolio performance will be measured against a total return index with securities with similar attributes and similar average maturity, e.g., the Merrill Lynch 1-3 Year U.S. Treasury fndex.

F. The City's investme nt portfolio will be diversified to avoid incurring unreasonable and avoidable risks assoc iated with concentrating investments in specific security types or in individual financial institutions.

G. While the City will not make investments for the purpose of trading or speculat ion as the dominant criterion, the City Treasurer shall seek to enhance total portfolio return by means of active portfo lio management. The prohjbition of specu lative investments preclude s pursuit of gain or profit through unusual risk and precludes investments primaril y directed at gains or profits from conjectural fluctuation s in market prices. However, as long as the original investments can be justified by their ordinary earning power, trading in response to changes in market value or market direction is a requirement of portfolio managem ent.

H. The City adheres to the guidance provided by the "prudent investor rule", which states that, "when investing, reinvesting, purchasing , acquiring, exchangi ng, selling, or manag ing public funds, a trustee shall act with care, skill, prudence, and diligence under the circumstances then prevailing, including, but not limited to, the general economic cond itions and the anticipated needs of the agency , that a prudent person acting in a like capacity and familiarity with those matters would use in the conduct of funds of a like character and with like aims, to safegua rd the principa l and maintain the liquidity needs of the agency." I. All participants in the investment process shall act responsib ly as custodians of the public trust. investment official s shall recogni ze that the investment portfo lio is subject to public review and evaluation. The overall prog ram shall be design ed and managed with a degre e of professionalism that is wort hy of the public trust.

Nevertheless , in a diversified portfo lio, it must be recognized that occasional measured losses are inevitable, and must be considered witrun the context of the overa ll portfolio's investme nt return, provided that adequate diversification has been impleme nted.

Ill. DELEGATION OF AUTHORITY
3-04-2024

CITY OF ANTIOCH

STATEMENT OF INVESTMENT POLICY
EXHIBIT 1
The responsibility for conducting the City's investment program resides with the City Treasurer , who shall estab lish written procedures for the operatio n of the investment program , consistent with this investment policy. Such procedures sha ll include explicit delegat ion of authority for all investment activities. Transaction s may be delegated to an independent investment advisor registered with the SEC who will meet at least quarterly with the City Treasurer and Finance Director to review genera l strategies and monitor results. rv. PERMITTED INVESTMENT INSTRUMENTS
The City of Antioch shall strive to maintain the level of investment of all idle funds as near I 00% as possible , through daily and projected cash flow determinations. Idle cash management and investment transactions are the responsibi lity of the City Treasurer. The City Treasurer, or designee , is autho rized to purchase the following investment instruments.

Investment of City funds is governed by the California Government Code Sections 53600 et seq., within the context of the limitations , the following investments are authorized , as further limited herein . A security purchased in accordance with this section shall not have a forward settlement date exceeding 45 days from the time of investment.

Where this section specifies a percentage limitation for a particular security type, that percentage is applied on the date of purchase. Credit criteria listed in this sect ion refers to the credit rating at the time the security is purchased.

If an investment's credit rating falls below the m inimum rating required at the time of purchase , the City Treasurer, or designee, will perform a timely review and decide whether to sell or hold the investment.

A. U.S. Treasury , notes, bonds, bills, or other certificates of indebtedness , or those for which the full faith and credit of the United States are pledged for the payment of principal and interest.

B. Federal agency or United States govern ment-sponsored enterprise obligations, part1c1pation, or other instrume nts, including those issued by or fully guaranteed as to principal and interest by federal agencies or United States government-sponso red enterpri ses.

C. Obligations of the State of California or any local agency within the state, includin g bonds payable solely out ofrevenues from a revenue producing property owned , contro lled or operated by the state or any local agency or by a department, board, agency or authority of the state or any local agency.

D. Registered treasury notes or bonds of any of the other 49 United States in addition to California, including bonds payable solely out of the revenues from a revenue-producing property owned, contro lled, or operated by a state or by a department , board, agency , or authority of any of the other 49 United States, in addition to California.

E. Repurchase Agreements. Repurcha se agreements are to be used solely as short-term investments not to exceed 30 days. The City may enter into repurcha se agreement s with primary government securities dealers rated "A" or better by two nationall y recognized rating organ izations (NRSRO). Counterparties should also have (i) a short-term credit rating in the highest category by an NRSRO ; (ii) minimum assets and capita l size of$25 billion in assets and $350 million in capita l; (ii i) five years of acceptab le audited financial results; and (iv) a strong reputation among market participants .

The following collateral restrictions will be observed: Only U.S. Treasury securities or Federa l Agency securities will be acceptable collateral. All securities underlying repurchase agreements must be delivered to the City's custodian bank versus payment or be hand led under a properly executed tri-party repurchase agreement. The total market value of all collatera l for each repurchase agreement must equal or exceed I 02% of the total dollar value oftbe money invested by the City for the term of the investment. For any repurchase agreemen t with a term of more than one day, the value of the underlying securities must be reviewed on an on-going basis according to market cond itions. Market value must be calculated each time there is a substitution of collateral.
2 3-04-2024

CITY OF ANTIOCH

STATEMENT OF INVESTMENT POLICY
EXHIBIT 1
The City or its trustee shall have a perfected first security interest under the Uniform Comme rcial Code in all securities subject to repurchase agreement. The City shall have properly executed a SLFMA agreement with each counter party with which it enters into repurchase agreeme nts.

F. Bills of exchange or time drafts drawn on and accepted by a commerc ial bank, otherwise known as bankers' acce ptances. Purchases of bankers' acceptances may not exceed I 80 days' matur ity, or 40% of the City's surp lus money that may be invested. Eligible bankers' acceptances are restricted to issuing financial institution s with short-term paper rated in the highest category by an NRSRO .

G. Comme rcial paper of "prime " quality of the highest ranking or of the highest letter and number rating as provided for by an N RSRO. The entity that issues the commercial paper shall meet all of the following conditions in either paragraph ( 1) or paragraph (2) below:

1. The entity meets the following criteria: (A) is organized and operating in the United States as a general corporation. (B) has total assets in excess of five hundred million dollars ($500,000,000). (C) has debt other than commercial paper, if any, that is rated in a rating category of "A" or its equivalent or higher by an NRS RO.

2. The entity meets the following criteria: (a) is organized within the United States as a specia l purpose corporat ion, trust, or limited liability company. (b) Has program wide credit enhancement s including, but not limited to, over collateralization, letters of credit, or surety bond. (c) Has commercial paper that is rated "A-I ", or its equiva lent or higher by an N RSRO.

Eligible commercial paper shall have a maximum maturity of ~ 397 days or less. The City may invest no more than 40% of its money in eligible commerci al paper. If the City's inves table assets fall below $100 million, the City may invest no more than 25% of its money in eligib le commercial paper.

H. Medium term notes with a maximum matur ity of five years issued by corporations organized and operating within the United States or by depository institution s licensed by the United States or any state and operating within the United States shall be rated in a rating category of "A" or its equivalent or better by an NRSRO.

Purchases of medium term notes may not exceed 30% of the City's portfo lio.

I. FDIC-insured or fuUy collateralized time certificates of deposit in financial institution s located in California, including U.S. branches of foreign banks licensed to do business in California. All time deposits must be collateralized in accorda nce with California Government Code Sectio n 5356 1, either at 150% by promissory notes secured by first mortgages and first trust deeds upon improved residential property in California eligible under Section (m) or at 11 0% by eligible marketable securities listed in Subsections (a) through (I) and (n) and (o). To be eligible to receive local agency deposits, a financia l institution must have received a minimum overall satisfactory rating for meeting the credit needs of California Communiti es its most recent evaluatio n.

J. Negot iable Certifica tes of Deposit issued by a nationally or state-chartered bank or a state or federa l savings and loan associa tion, a state or federa l credit union, or by a federally- or state-licensed branch of a foreign bank. Purchases of negot iable certificates of deposit may not exceed 30% of the City's surplus money.

I. Certificates with maturities up to one year shall have an "A-1 "rating, or its equivalent or higher, as prov ided for by an NRSRO.

2. Cert ificates with maturit ies greater than one year and through five years shall be rated in a rating category of"A," its equivalent or better by an NRSRO .

K. State of Californ ia's Loca l Agency Investment Fund (LAIF). Investment in LAIF may not exceed the amount spec ified by the State Treasurer .

I. The LAJF portfolio should be reviewed periodica lly. 3 3-04-2024

CITY OF ANTIOCH

STATEMENT OF INVESTMENT POLICY
EXHIBIT 1
L. California Asset Management Program (CAMP).

M. Shares of beneficial interest issued by diversified management companies that are money market funds registered with the Securit ies and Exchange Commission under the Investment Company Act of 1940 (I 5 U.S.C. Sec. 80a-l , et seq.). To be eligible for investment pursuant to this subdivision these companies shall either:

I. Attain the highest ranking letter or numerical rating provided by not less than two of the three largest NRSROsor

2. Have an investme nt advisor registered or exempt from registration with the Securities and Exchange Commission with not less than five years experience managing money market mutual funds and with assets under management in excess of $500,000,000.

The purchase price of shares shall not exceed 20 perce nt of the investment portfolio of the City.

N. Asset-Backed Securities
A mortgage passthrough security, collateralized mortgage obi igation, mortgage-backed or other pay-through bond, equipment lease-backed certificate , consumer receivable passthrough certificate , or consume r receivable -backed bond.

For securities eligible for investmen t under this subd ivision not issued or guaranteed by an agency or issuer identified in subdivision (b) or (t), the following limitations apply:
(A) The security shall be rated in a rating category of"AA" or its equivalent or better by an NRSRO and have a maximum remaining maturity of five years or less.
(8) Purchase of securities authorized by this paragraph shidl not exceed 20 percent of the agency 's surplus moneys that may be invested pursuant to this section.

0. United States dollar denominated senior unsecured unsubordinated obligation s issued or unconditionally guaranteed by the Intern ational Bank for Reconstruction and Development (IBRD), Internation al Finance Corporation (rFC), or Inter-American Development Bank (JADB), with a maximum remaining maturity of five years or less, and eligible for purchase and sale within the United States. Investment s under this subdivision shall be rated in a rating category of"AA" or its equivalent or better by an NRS RO.

Purchases of these securities sha ll not exceed 30 percent of the investment portfolio of the City.

P. Insured savings account or money market account. To be eligible to receive local agency deposits, a financial institution must have received a minimum overall satisfactory rating for meeting the credit needs of California Communities in its most recent evaluation.

V. PROHIBfTED fNVESTMENTS
Any sec uri ty type or structure not specifically approved by this poli cy is hereby specificall y prohibited.

Security types which are thereby prohibited include, but are not limited to:
3-04-2024
I. Reverse repurcha se agreements .

2. The City shall not invest any funds in inverse floaters, range notes, or interest only strips that are derived from a pool of mortgage s, or in any security that could result in zero interest accrual if held to maturity.
4 CITY OF ANTIOCH

STATEMENT OF INVESTMENT POLICY
EXHIBIT 1

3. The City will not invest in any companies that produce alcoho l for public consumption or tobacco product s.

Notwithstanding the prohibition s stated in the above paragraph, the City may invest in securities issued by, or backed by, the United States governme nt that could result in zero- or negative-interest accrual if held to maturity ; in the event of, and for the durat ion of, a period of negative market interest rates. The City may hold these instruments until their maturity dates.

VI. MA TURlTY
Investmen t maturities sha ll be based on a review of cash flow forecasts. Matu rities will be sched uled as to permit the City to meet all projected obligations. No investment shall be made in any security, other than a secur ity underlying a repurchase or reverse repur chase agreement as authorized by this sect ion that at the time of the investme nt has a term remaining to maturity in excess of five years unless City Council has provided approval for a specific purpo se at least three month s before the investment is made . The City Council has approved agency mortgage -backed secu rities (MBS) as permitted by Section IV.B. of this Policy to have a final maturi ty longer than five years. The weighted average life (WAL) of agency MBS may not exceed five years. For purpo ses of comp liance with this Policy, an investment 's term or remainin g maturity sha ll be measured from the settlement date to final maturity.

VII. DIVERSIFI CATION
It is City policy to diversify the investment portfol io in order to redu ce the risk of loss resulting from other concentrat ion of assets in a specific maturi ty, a specific issuer, or a specific class of securities. The follow ing strateg ies and constrai nts shall apply:

A. Maturities shall be selected which provide for stab ility of income and reasonable liquidi ty.

B. Concern for liquidity shall be insured through practice s that include covering the next vendor disbursement date and payro ll date through maturin g investments.

C. Risks of market price volatility shall be controlled through the appropria te management of the portfo lio' s duration versus the benchmark duration. Whereby duration is used as a measure of the portfolio's sensitivity to changes in interest rates which cause market price volatility.

D. Specifi c diver sificat ion limitation shall be imposed on the portfo lio as follows:

I. The portfo lio's duration should be appropriately positioned relative to benchmark duration during rising and fa lling interest rate env ironments.

2. Except for fully collateralized deposits, investment s in pooled funds such as LAIF, CAMP , and money market funds, instruments of the U.S. Government or its Agenc ies and securiti es issued by the IBRD, lFC, and IADB , no more than 5% of the overall portfolio may be invested in the secur ities of a sing le financial institution .

3. la accordance with California statute s, City deposits including collateral ized certificates of dep osit shall not exceed the total paid up cap ital (to include capital notes and debentures) and surplu s of any depository -bank. or the total of the net worth of any sav ings and loan association.

YUi. RISK TOLERANCE
The City recognizes that investment risks can result from issuer defaults, market price changes or variou s technical complications leading to temporary illiquidity . Portfolio diversification is employed as a way to contro l risk.

No individual investment transaction shall be undertaken which jeopardi zes the total capita l position of the overall portfo lio. The City Treasurer sha ll periodica lly establi sh guidelines and strategies to control risks of default, market price changes and illiquidity.
5 3-04-2024

CITY OF ANTIOCH

STATEMENT OF INVESTMENT POLICY
EXHIBIT 1
In add ition to these general policy considerations, the following specific policies will be strict ly observed.

A. All investment funds will be placed directly with qualified financial institutions. The City will not deposit or invest funds through third parties or money brokers.

B. All transact ions will be executed on a delivery versus payment basis with one exception: Upon the City's receipt of an account number from an authorized officia l, a California savings and loan institution and Bay Area banks shall have 48 hours from the transaction settlement date in which to deliver the certificate of depo sit for a collateral ized deposit to the City's safekee ping, even though payment is made by the City on the settleme nt date.

C. A competitive bid process , utilizing a minimum of three financial institutions deemed eligible by the City's lnvestment Advisor , will be used to place all investment purchases. Based on a quarterly evaluation , securities dea lers, banks and other financial institut ions will be dropped or continued on the eligibility list. The following criteria will be used in the quarterly evaluation:

I. Number of transactions compet itive ly won.

2. Prompt and accurate confirmation of transactions.

3. Efficient secu rities delivery.

4. Accurate market informat ion account serv icing.

D. The City Treasure r shall forward a copy of and updates to the City's Investment Policy to the City's lnvestment Advisor and require written acknow ledgme nt of the Policy.

IX. SAFEKEEPING AND CUSTO DY
To protect against potential fraud and embezzlement, the assets of the City shall be held in the City's vault or secured through third party custody and safekeeping procedures. City Treasurer or designee shall be bonded to protect the public against possible embezzlement and malfeasance. Safekeeping procedures shall be reviewed annually by an independent auditor. The aud itor may conduct surprise audits of safekee ping and custodial procedur es.

All securit ies will be received and delivered using standard delivery versus payment procedures.

X. REPORTIN G REQUIREMENTS
The City Treasurer shall render to the City Council at least a quarterly investment report, which shall include, at a minimum , the following information for each individual investme nt:

I. Type of investment instrument (i.e., Treasury Bill, medium term note);

2. Issuer name (i.e., Genera l Electr ic Credit Corporation);

3. Purchase date (trade and settlement date);

4. Matur ity date ;

5. Par value;

6. Purchase price;

7. Current market value and the source of the valuation ;

8. Overall portfolio yield based on cost.

The quarterly report also shall (a) state comp liance of the portfolio to the statement of investment policy, or manner in which the portfolio is not in compliance ; (b) include a descript ion of any of the City's funds, investme nts, or programs that are under the management of contracted parties, including lending programs ; and (c) include a statement denoting the ability of the City to meet its expenditure requirements for the next six months , or provide an explanation as to why suffic ient money shall, or may, not be available.

As a good reporting practice, the Report will be submitte d on a quarterly basis and provided to the Council. 6 3-04-2024

CITY OF ANTIOCH

STATEMENT OF INVESTMENT POLICY
The Treasurer will submit to City Counci l a monthly report of investment transactions .

XI. LNVESTMENT POLICY REVIEW
EXHIBIT 1
The Statement of Investm ent Policy shall be review ed annually by the City Treasurer and shall be rendered to the City Council at a public meeting when any changes are proposed or at least every two years. xa. INTERNAL CONTROLS
The Finance Director and Treasurer are responsible for establishing and maintainin g an internal contro l structure designed to ensure that the financial assets of the City are protected from loss, theft, fraud and misuse. xm. INVESTMENT POOLS/MUTUAL FUNDS
The Treasurer will perfonn due diligence reviews of pools and funds prior to investing, and on a continual basis. 7 3-04-20 24

7 Agenda Item #

STAFF REPORT TO THE CITY COUNCIL
DATE: Regular Meeting of June 9, 2026
TO: Honorable Mayor and Members of the City Council
SUBMITTED BY: Karina Moreno-Coria, Acting Human Resources Manager KMC APPROVED BY: Ana Cortez, Acting City Manager AEC
SUBJECT: Presentation on Vacanc y Rates and Recruitment and Retention Efforts, Pursuant to California Assembly Bill 2561 (AB 2561)

RECOMMENDED ACTION
It is recommended that the City Council receive the presentation on the City’s vacancy rates, recruitment efforts, and employee retention strategies, as required by Assembly Bill 2561.

FISCAL IMPACT
There is no fiscal impact. This presentation is informational only.

DISCUSSION
Assembly Bill 2561 (AB 2561), effective January 1, 2025, requires public agencies to annually report their full -time position vacancy rates, recruitment efforts, and employee retention strategies. The legislation includes three key provisions:

1. Annual Public Hearing -
Agencies must present the status of job vacancies, recruitment, and retention strategies at a public hearing before the governing body at least once per fiscal year and prior to budget adoption.

2. Bargaining Unit Participation -
Recognized employee bargaining units may present at the hearing regarding positions within their respective units.

3. Additional Reporting Requirements –
If a bargaining unit’s vacancy rate exceeds 20% of its authorized full-time positions, and upon request of the unit, the City must provide the following at the hearing:
• Total number of vacancies
• Number of applicants
• Average time to fill positions
• Opportunities to improve compensation and working conditions Antioch City Council Report
June 9, 2026 Agenda Item #7 2
The City of Antioch has seven recognized bargaining units representing approximately 4001 authorized full -time positions. For the majority of calendar year 2025, the City maintained 4102 authorized full -time positions, of which 349 were filled and 61 were vacant. During the year, the number of authorized positions changed as part of the budget process based on the recommendations from departments to address operations, service delivery, and staffing needs. Effective Fiscal Year 20 25/2026, 10 new positions were added, and funding was removed for 20 positions.

In calendar year 2025:
• 92 positions were filled
• 53 positions were vacated
Notably, key roles, including the Assistant City Attorney, Public Safety Manager and Public Information/Communication Officer were filled. A significant focus was placed on filling vacancies across all departments along with those required by the DOJ agreement.

Vacancy Summary by Bargaining Unit:

Bargaining Unit Members Unfilled Vacancy
Rate
Antioch Police Officers’ Association 125 23 18%
Antioch Police Sworn Management Assoc. 9 1 11%
Operating Engineers Local No. 3 85 9 13%
Confidential 27 2 7%
Management 55 10 18%
Antioch Public Works Employee Association 80 10 13%
Treatment Plant Employees Association 19 3 16%
All vacancy rates fell below 20%, for all seven bargaining units.

This presentation fulfills the City’s annual obligation under AB 2561. The City remains committed to addressing vacancies, with continued emphasis on hiring for critical functions such as law enforcement and executive management to ensure an effective delivery service.

ATTACHMENTS
A. Presentation
1 Elected Officials (7) are not included in count.
2 Elected Officials (7) included in count. Three (3) positions are included in the count but have not been allocated due to pending City Council approval.
1 ATTACHMENT A
2 3

4 5

6 7* Three vacant positions have not been assigned a bargaining unit

8 9

10 11

12 13

5 YEAR CAPITAL IMPROVEMENT
PROGRAM 2026-2031
DRAFT JUNE 9, 2026
ATTACHMENT "B"
City of Antioch | Capital Improvement Program Overview I-1

Table of Contents

SECTION I: EXECUTIVE SUMMARY
Capital Improvement Program Overview ................................................................................................... I-2 Program Objective .................................................................................................................................. I-2 Capital Improvement Program Process .................................................................................................. I-3 Capital Improvement Program Categories ............................................................................................. I-4 Special Funds......................................................................................................................................... I-11 Roadway Maintenance Projects ....................................................................................................... I-11 Development Impact Fees and Park-In-Lieu Fees Projects ............................................................... I-12 Projects Completed in Fiscal Year 25/26 .............................................................................................. I-13 Projects in Progress ............................................................................................................................... I-14 Projects Added to the CIP ..................................................................................................................... I-16 2026 – 2031 CIP Projected Capital Expenditures ...................................................................................... I-17 2026 – 2031 CIP Funding Sources Summary ............................................................................................. I-18

SECTION II: PROJECT LISTS
Community Facilities…………………………………………………………………………………………………………………………….II-1 Parks and Trails ……………………………………………………………………………………………………………………………………II-6 Roadway Improvements ………………………………………………………………………………………………………………………II-8 Traffic Signals ………………………………………………………………………………………………………………………………….…II-11 Wastewater and Storm Drain Systems ………………………………………………………………………………………………II-12 Water System ..………………………………………………………………………………………………………………………………….II-13

SECTION III: PROJECT DETAILS

City of Antioch | Capital Improvement Program Overview I-2

Capital Improvement Program Overview
Program Objective

The primary objectives of the City of Antioch’s Capital Improvement Program (CIP) are:
• To provide professional and technical engineering services and support to all City Departments related to facility expansions and improvements, infrastructure rehabilitation and development.
• To provide leadership in implementing Federal, State and Local programs.

The CIP relates the City’s annual capital expenditures to a long -range plan for public improvements. California Government Code Section 66002 requires local agencies that have developed a fee program to provide the approximate location, size and timing of projects, in addition to an estimate for the cost of all facilities or improvements to be financed by fees. This is frequently done by the adoption of a CIP and is the process Antioch uses to meet this requirement.

The Capital Improvement Budget document is different from the Operating Budget document, but the two budgets are closely linked. The Capital Improvement Budget, as distinguished from the Operating Budget, is used as a planning tool by the City to identify specific Capital Improvement needs consistent with the financing and timing of those needs in a way that ensures the most responsible and efficient use of resources.

Projects within the CIP are allocated over five years using both existing and projected revenue sources. The Capital Improvement staff:
• In consultation with other departments, determines upcoming capital needs. • Prepares construction documents, including plans, specifications, bid documents and estimates for the needed projects or prepares procurement documents, as needed. • Provides project management and construction oversight.

The CIP is a five-year plan to guide the construction or acquisition of capital improvements and includes the capital budget for the next fiscal year, which is authorization from the City Council to expend dedicated revenues for specified projects. Prior to adoption by the City Council each year, the CIP is reviewed by the City’s Planning Commission to assure its consistency with the City’s current General Plan.

City of Antioch | Capital Improvement Program Overview I-3

The five -year CIP is reviewed annually to enable the City Council to reassess projects in the program. Project expenditures for outlying years beyond fiscal year 2027 are provided in the CIP for planning purposes only and do not reflect a Council commitment of funds.

Capital Improvements Division Personnel:

Scott Buenting Public Works Director/City Engineer
Lori Medeiros Administrative Analyst II
Julie Viray Administrative Analyst I
Robert Pizarro Assistant Engineer
Mitchell Loving Junior Engineer
Paul Fuentes Public Works Engineering Technician
Capital Improvement Program Process

The CIP is developed as a coordinated effort between the C apital Improvement staff and the Director of Finance.

The annual CIP process begins with a memo and a CIP Project Request form sent out to all City departments requesting proposals for capital projects. New CIP project requests are evaluated and prioritized based on goals and objectives of the City Council, as well as available funding, project need, and the impacts on the operating budget. Some projects have specified funding sources, such as assessment districts, Federal and State grants, or special fees.

The Draft CIP is prepared by Capital Improvement staff and reviewed by the Finance Department before being circulated and approved by the Planning Commission and presented to the Parks & Recreation Commission and the City Council as part of the annual review. The Final CIP budget is presented to the City Council in June and is adopted concurrently with the annual operating budget.

City of Antioch | Capital Improvement Program Overview I-4

Capital Improvement Program Categories

This category includes new and renovated
public buildings, as well as the Marina. The
majority of the projects in this category are
located in the City’s former redevelopment
areas.

This category includes improvements and
renovations for local and community parks,
open space, and trails in the City.

This category includes new streets, street
widening, street rehabilitation, surface
treatments, sidewalk repair program, and
the City’s Pavement Management System.

This category includes new traffic signals
and signal modifications throughout the
City.

This category includes extensions,
replacements, rehabilitations and
modifications of the sewer and storm
drainage system.

This category includes projects related to
the Water Treatment Plant and
extensions, replacements, rehabilitations
and modifications of the water distribution
system.

Community Facilities
Parks & Trails
Roadway
Improvements
Traffic Signals
Wastewater and
Storm Drain Systems
Water Systems

City of Antioch | Capital Improvement Program Overview I-5

Fund Name

Capital Improvement
Fund

Road Maintenance and
Rehabilitation Account
(RMRA) Fund

Gas Tax Fund

Marina Fund

Fund Description

This fund was established to set aside money from various funds for any Capital Improvement project not provided for in one of the other funds, such as parks and community
facilities improvement projects. The City may transfer
General Fund dollars to the Capital Improvement Fund as funding becomes available. Decisions to transfer funds from various funding sources to the Capital Improvement Fund are made annually by the City Council.

The California SB1 Act included RMRA funding to support maintenance and safety improvements on highways, local
streets and roads, and bridges that do not meet state
performance criteria.

The City receives gas tax funds from the State of California, as provided by the State Street and Highways Code. The gas tax funds are limited to research, planning, construction, improvement, maintenance, and operation of public streets.

The City also uses these funds to pay for maintenance and operation of streetlights and traffic signals.

This fund accounts for the operation, including capital improvements, of the City's Marina and the Fulton Shipyard Boat Ramp. Funds are collected from lease agreements,
berth rentals and launch fees.

City of Antioch | Capital Improvement Program Overview I-6

Fund Name

Measure “J” Return to
Source

Traffic Signal Fund

Water & Sewer Related
Reserve Funds

National Pollutant
Discharge Elimination
System Fund (NPDES)

Funding Agreement for
the Northeast Annexation
Infrastructure
Improvement

Fund Description

The source of money for this fund is the voter approved one- half cent sales tax. Provided the City has complied with the Growth Management Program, each year the City receives
return to source funding from the Contra Costa
Transportation Authority to be used for transportation
improvement and maintenance projects.

Fees are collected from developers to fund offsite traffic signals.

The City collects user and developer fees to fund offsite water and sewer facility improvements. The fees are placed into one of the following four funds:
• Water Fund
• Sewer Fund
• Water System Improvements Fund
• Sewer System Improvements Fund

The National Pollutant Discharge Elimination System was mandated by the Clean Water Act of 1987 to reduce storm water related pollution. The program is funded by a parcel assessment.

In 2013 the City entered into reorganization and a property tax revenue allocation agreement with Contra Costa County for the annexation of the northeast area. Per the agreement, the City will receive property tax revenue from the Contra Costa County for the construction of the infrastructure improvements needed within the northeast annexation area.

City of Antioch | Capital Improvement Program Overview I-7

Fund Name

Delta Fair Property Fund

American Rescue Plan Act
(ARPA)

Recreation Fund

East Contra Costa
Regional Fee and
Financing Authority
(ECCRFFA)

Fund Description

This fund was created when the City sold property it owned on Delta Fair Boulevard at the City’s western City limits. The property was originally purchased from the State on the condition that it is to be used for public purposes. When it was decided that the property was more suitable for
commercial use and should be sold or leased, the State gave its permission on the condition that the proceeds be used for park purposes.

ARPA is a federal stimulus bill to aid public health and economic recovery from the COVID-19 pandemic. The plan
includes $350 billion in emergency funding for state, local, territorial and tribal governments, known as the Coronavirus State and Local Fiscal Recovery Funds.

This fund provides programs that focus on youth and family enrichment, healthy lifestyles, sports and fitness and services for older adults. The Parks and Recreation Department
maintains a variety of facilities and spaces that are hosted by city programs and are also available for reservation by residents. Recreation Services ensure that all residents have access to the benefits of local parks and recreation.

The East Contra Costa Regional Fee and Financing Authority is a regional planning agency charged with funding regional transportation improvement projects in eastern Contra Costa County with revenue from the Authority’s regional
transportation demand impact mitigation (RTDIM) fees. The Authority's jurisdiction includes the eastern portion of the County, including unincorporated areas and the Cities of Antioch, Brentwood, Oakley, and Pittsburg.

City of Antioch | Capital Improvement Program Overview I-8

Fund Name

East Lone Tree Specific
Plan Benefit District

Park-in-Lieu

Tidelands AB1900

Assessment District 27/31

Assessment District 26

Public, Educational, and
Governmental (PEG)
Funds

Fund Description

The East Lone Tree Specific Plan (ELTSP) guides development in the city’s Future Urban Area #2, focusing on creating a mixed-use environment with residential, commercial, and employment opportunities. Recent updates, including
amendments adopted in 2024 and ongoing projects, aim to streamline commercial development and increase housing
density near transit, particularly near the Hillcrest BART station.

Park-in-lieu funds are fees paid by developers to local governments instead of dedicating land for parks in new residential developments, often authorized by the Quimby Act in California. These funds must be used for park
acquisition or improvement, with strict time limits (often five years) for spending to avoid mandatory refunds.

Tidelands funding is a dedicated revenue source, often
derived from offshore oil and gas production or lease rentals, used to maintain public trust lands like beaches, marinas, and waterfront infrastructure.

This district refers to the Lone Diamond Assessment District, which has been historically associated with city infrastructure funding and debt service.

This district refers to the Hillcrest District, which has been historically part of the city's special fund balances for infrastructure and services to the Hillcrest area.

PEG Funds are restricted capital fees, often approximately 1% of gross revenues, collected from cable providers via franchise agreements to support local community access
channels. These funds are exclusively for capital expenses— such as equipment, software, and studio facilities to ensure local, educational, and government meetings are broadcast.

City of Antioch | Capital Improvement Program Overview I-9

Grant Name
Congestion Mitigation Air
Quality (CMAQ)

Community Development
Block Grant (CDBG) Fund

Highway Safety
Improvements Program
(HSIP)

Transportation
Development Act (TDA)

Active Transportation
Program (ATP)

One Bay Area Grant
(OBAG 2/3) Program

Grant Description
CMAQ funds are federal funds used to reduce emission from vehicle travel and provide alternatives to driving alone.

Signal timing is another example of emission reduction.

This fund accounts for grant funds received from the Federal Government for the purpose of developing community
programs and urban renewal projects.

The purpose of this federal-aid program is to achieve a significant reduction in fatalities and serious injuries on all public roads. The Hazard Elimination Safety (HES) is included in this program.

TDA provides state funding from sales taxes to each county and city, for transit operations and bicycle facilities.

Funding under this program is intended to encourage
increased use of active modes of transportation, such as biking and walking. Safe Routes to School is now included in this grant program.

The inaugural One Bay Area Grant Program was adopted by MTC in 2012 to guide federal funds from 2012-13 through 2016-17. OBAG 2 is the second round of OBAG funding and OBAG 3 is the third round of OBAG funding. The OBAG 2 and OBAG 3 program is divided into a Regional Program,
managed by MTC, and a County & Local Program, managed
by MTC in partnership with the nine Bay Area County
Transportation Agencies. Cities and counties can use these funds to invest in:
• Local street and road maintenance
• Streetscape enhancements
• Bicycle and pedestrian improvements
• Safe Routes to School projects
• Priority Conservation Areas (PCAs)
• Transportation planning

City of Antioch | Capital Improvement Program Overview I-10

Grant Name

California Natural
Resources Agency Grant

MTC’s Pavement
Management Technical
Assistance Program
(P-TAP)

Proposition 68

Safe Streets and Roads for
All (SS4A)

Grant Description

This funding was appropriated by the State Legislature in Senate Bill (SB) 129, Chapter 69 (Control Section 19.56 Enacted Budget), which was approved by Governor Newsom
on July 12, 2021.

This program uses federal dollars to help Bay Area cities and counties stretch their road budgets by:
• Implementing, updating and maintaining pavement
management databases
• Providing accurate pavement condition data to city
councils, county supervisors or other local decision
makers
• Supporting the region’s management of non-
pavement street and road assets, such as signs, storm
drains, curbs and gutter, traffic signals and
streetlights as pilot projects

The purposes of Prop 68 include creating parks, enhancing river parkways, and protecting coastal forests and wetlands.

Prop 68 also provides funding for outdoor access, lower cost coastal accommodation and climate adaptation.

This program funds regional, local and Tribal initiatives through grants to prevent roadway deaths and serious
injuries.

City of Antioch | Capital Improvement Program Overview I-11

Special Funds

Roadway Maintenance Projects

The City of Antioch has approximately 336 centerline miles of roadway within City limits.

As part of the City Pavement Management System Program, the City of Antioch selected a pavement management consultant to perform a Pavement Management Update for the City by inspecting the pavement conditions of arterial, collector and residential streets.

The Pavement Management System Report , which was completed in 202 4, rated the City’s overall network condition as a 63 PCI (Pavement Condition Index). The PCI is a value on a rating scale from 0 to 100 (where 100 is equivalent to a new street ). A PCI between 60 and 69 is considered “fair”. According to the 20 23 Pavement Management System Report, the City’s current backlog (deferred maintenance) is approximately $302 million. Backlog is defined as the unfunded needs to bring the overall network condition to optimum levels (81-82 PCI).

In addition to the City’s funds allocated to the CIP for roadway improvements projects, the City’s Street Maintenance Division also contributes to roadway improvements each fiscal year repairing deteriorating pavement, utility service repairs and utility trenches. The work is performed using a combination of City staff and private contractors.

City of Antioch | Capital Improvement Program Overview I-12

Development Impact Fees and Park-In-Lieu Fees Projects

On March 25, 2014, City Council adopted the Development Impact Fees and Quimby Act/Park In -Lieu Fees, which bec ame effective April 24, 2014. These fees are one -time charges on new development that are collected and used by the City to cover the cost of capital facilities and infrastructure that are required to serve new growth. Implementation of these future projects is based on th e rate of growth, timing of fee collection, and full project funding . The following projects will occur beyond the five -year term of this document:

EXPENDITURES COST ESTIMATE

FUNDING SOURCES
Development
Impact Fees

FUTURE CIP
(UNFUNDED)
General Administration Capital Facilities Needs
City Hall $4,978,000 $4,978,000 $0
Land Purchase $124,000 $124,000 $0
Vehicles $161,000 $161,000 $0
Information Technology $237,000 $237,000 $0
Total $5,500,000 $5,500,000 $0
Public Works Capital Improvements Needs
Maintenance Yard Area $914,000 $914,000 $0
Building Space $2,568,000 $2,568,000 $0
Garbage Ramps $102,000 $102,000 $0
PW Vehicles $1,777,000 $1,731,000 $46,000
Total $5,361,000 $5,315,000 $46,000
Police Capital Improvement Needs
PD Facility $11,923,000 $11,923,000 $0
Vehicles $1,129,000 $1,052,000 $77,000
Other $1,529,250 $1,260,000 $269,250
Total $14,581,250 $14,235,000 $346,250
Parks & Recreation Capital Facility Needs
Facilities $35,773,000 $7,286,000 $28,487,000
New Community Center $17,761,000 $14,498,000 $3,263,000 New Library $31,872,000 $6,492,000 $25,380,000
Total $85,406,000 $28,276,000 $57,130,000
GRAND TOTAL $110,848,250 $53,326,000 $57,522,250

*Fees will be updated in FY 26/27
City of Antioch | Capital Improvement Program Overview I-13

Projects Completed in Fiscal Year 25/26

Program Category Investment
Community Facilities

Amtrak Station Improvements $375,000
Wi-Fi Installation in Downtown $130,000
Antioch Community Center Carpet Replacement $75,000
Prewett Park Grand Plaza Shade Structure Upgrade $150,000 Utility Box Artwork $82,000
Total $812,000
Parks & Trails

Concrete Pathway Repairs $178,000
Total $178,000
Roadway Improvements

Neighborhood Traffic Calming Project $238,000
Pavement Plugs & Leveling Courses $1,400,000
Curb, Gutter & Sidewalk Repair $400,000
Total $2,038,000
Water Systems

Brackish Water Desalination $96,000,000
Total $96,000,000
Projects Completed Grand Total $99,028,000

City of Antioch | Capital Improvement Program Overview I-14

Projects in Progress

Program Category Investment
Community Facilities

City Hall Office Modifications, Phase 2 $1,433,000
Prewett Park Pool Resurfacing $500,000
Emergency Operations Center Improvements $480,000
Facility Maintenance & Repairs $805,000
Integration and Upgrade of Access Control $320,000
Installation of PD Radio Simulcast Tower $231,000
Nick Rodriguez Community Center Rehabilitation $2,442,000 Finance & Human Resources Department Facility $833,000
Prewett Park Concrete Improvements $200,000
Security Fencing at City Facilities $168,000
Total $7,412,000
Parks & Trails
Park Facilities Upgrade $515,000
Jacobsen Park Renovation $625,000
Marchetti Park Renovation $1,871,000
Trail Maintenance Program $253,000
Community Bicycle Garden $5,000,000
Total $8,264,000
Roadway Improvements

2026/27 Sidewalk Repair Program $400,000
Antioch Cape Seal 2026 $1,700,000
Installation of Park Signage $320,000
Traffic Calming Program $380,000
L Street Improvements $21,109,000
Streetlighting Improvements $390,000
Sycamore Traffic Calming $425,000
Antioch School Pedestrian Safety Improvements $100,000
Total $26,224,000
Traffic Signals

Trail Crossing Improvements $920,000
Signal System Upgrades at 69 Locations $2,800,000
Countywide SMART Signals $3,000,000
Heidorn Ranch Road/Prewett Ranch Drive $395,000
Total $7,115,000

City of Antioch | Capital Improvement Program Overview I-15

Wastewater & Storm Drain System

Sewer System Master Plan Update $700,000
East Antioch Creek Outfall Improvements $2,500,000
Total $3,200,000
Water System

Water Studies and Planning $426,000
Water Treatment Plant Improvements $659,000
Water Treatment Plant Solids Handling Study $500,000
AMI Water Meter Reading Upgrade $1,866,000
Total $3,451,000
Projects in Progress Grand Total $55,666,000
City of Antioch | Capital Improvement Program Overview I-16

Projects Added to the CIP

Program Category Investment
Community Facilities
Police Department Dispatch/Real Time Crime Center $4,000,000 Antioch Community Center Roof Improvements $540,000
City Hall Roof Improvements $345,000
Police Department Roof Improvements $1,350,000
Public Works Roof Improvements $490,000
Carnegie Library Renovation $200,000

Total $6,925,000
Roadway Improvements
Slatten Ranch Road, Phase 1 $34,000,000
Total $34,000,000
Wastewater & Storm Drain System
Sewer System Master Plan Update $700,000
Total $700,000
Water System
Removal of Underground Storage Tank $200,000
Total $200,000
Projects Added Total $41,825,000

2026 - 2031 CIP PROJECTED CAPITAL EXPENDITURES
Program Category
Revised FY
25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31Total Community Facilities $13,437 $5,862 $2,615 $2,160 $1,555 $555 $26,184 Parks & Trails $9,045 $3,875 $1,325 $1,325 $1,325 $1,325 $18,220 Roadway Improvements $33,899 $6,345 $8,650 $14,350 $15,450 $11,850 $90,544 Traffic Signals $6,342 $395 $0 $400 $0 $0 $7,137
Wastewater & Storm Drain System$2,175 $2,473 $3,825 $475 $1,325 $475 $10,748 Water System $15,217 $5,675 $9,725 $4,200 $3,750 $4,600 $43,167 Total ($ in thousands) $80,115 $24,625 $26,140 $22,910 $23,405 $18,805 $196,000 Community Facilities13%Parks & Trails9%Roadway Improvements46%Traffic Signals4%Wastewater & Storm Drain System6%Water System22%TOTAL 5-YEAR EXPENDITURES Community Facilities13%Parks & Trails9%Roadway Improvements46%Traffic Signals4%Wastewater & Storm Drain System6%Water System22%TOTAL 5-YEAR EXPENDITURES I-17
2026 -2031 CIP FUNDING SOURCES SUMMARY
Funding Source
Revised
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31Total Capital Improvement Funds
AD 27/31 $0 $74 $0 $0 $0 $0
Assessment District 26 $0 $350 $0 $0 $0 $0
Capital Improvement Fund $200 $0 $0 $0 $0 $0
NE Annexation $0 $1,998 $0 $0 $0 $0
$200 $2,422 $0 $0 $0 $0 $2,622
Enterprise Funds
Sewer Fund $1,033 $225 $225 $225 $225 $225
Sewer System Improvement Fund$1,200 $300 $2,150 $300 $1,150 $300 Water Fund $13,283 $5,825 $8,025 $4,350 $1,900 $4,750
Water System Improvement Fund$2,500 $0 $2,000 $0 $2,000 $0 $18,016 $6,350 $12,400 $4,875 $5,275 $5,275 $52,191
Grant Funds
HSIP Grant $3,349 $0 $0 $0 $0 $0
OBAG2 $1,468 $0 $0 $0 $0 $0
OBAG3 $2,514 $0 $0 $0 $0 $0
Prop 68 Grant $248 $0 $0 $0 $0 $0
SS4A Grant $17,008 $0 $0 $0 $0 $0
State Grant - CNRA $2,162 $0 $0 $0 $0 $0
TDA Grant $0 $100 $0 $0 $0 $0
$26,749 $100 $0 $0 $0 $0 $26,849
Special Revenue Funds
ARPA $780 $0 $0 $0 $0 $0
Delta Fair Fund $56 $0 $0 $0 $0 $0
Development Impact Fees $2,427 $0 $0 $0 $0 $0
East LT Spec Plan Ben District $0 $0 $2,800 $6,000 $2,500 $0 ECCRFFA $0 $0 $1,200 $4,000 $3,500 $0
Gas Tax $4,006 $905 $905 $875 $905 $875
Measure J $4,453 $845 $1,500 $1,300 $1,300 $800
NPDES $200 $100 $100 $100 $100 $100
Park-In-Lieu Fund $2,268 $500 $150 $150 $150 $150
PEG Franchise Fee $600 $0 $0 $0 $0 $0
Recreation $20 $0 $0 $0 $0 $0
RMRA $9,605 $2,500 $1,500 $2,000 $1,000 $2,000
Tidelands AB1900 $75 $0 $0 $0 $0 $0
Traffic Signal Fund $363 $395 $0 $400 $0 $0
$24,853 $5,245 $8,155 $14,825 $9,455 $3,925 $66,457
General Fund $4,918 $230 $175 $100 $100 $100 $5,623
Unfunded $5,380 $10,278 $5,410 $3,110 $8,575 $9,505 $42,258 Total ($ in thousands) $80,115 $24,625 $26,140 $22,910 $23,405 $18,805 $196,000 I-18
Project No. Project Title Funding Source
Revised FY
25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31 Total 7928 Amtrak Station Improvements
Project Status:Planning/Design StageGas Tax $375 $0 $0 $0 $0 $0 $375 Total Funding $375 $0 $0 $0 $0 $0 $375
7929 Marina Basin Dredging
Project Status:Planning/Design StageTidelands AB1900 $75 $0 $0 $0 $0 $0 $75 Unfunded $0 $425 $0 $0 $0 $0 $425
Total Funding $75 $425 $0 $0 $0 $0 $500
7948 Restoration of Public Art
Project Status:Ongoing Program General Fund $47 $0 $0 $0 $0 $0 $47 Unfunded $25 $25 $25 $25 $25 $25 $150
Total Funding $72 $25 $25 $25 $25 $25 $197
7949 Prewett Park Easement Fencing
Project Status:Planning/Design StageAD 27/31 $0 $74 $0 $0 $0 $0 $74 Gas Tax $0 $30 $0 $0 $0 $0 $30
General Fund $0 $35 $0 $0 $0 $0 $35
Unfunded $0 $414 $0 $0 $0 $0 $414
Total Funding $0 $553 $0 $0 $0 $0 $553
7954 Murals
Project Status:Ongoing Program Unfunded $80 $80 $80 $80 $80 $80 $480 Total Funding $80 $80 $80 $80 $80 $80 $480
7957 City Hall Office Modifications, Phase 2
Project Status:Planning/Design StageDevelopment Impact Fees $173 $0 $0 $0 $0 $0 $173 General Fund $1,433 $0 $0 $0 $0 $0 $1,433
Total Funding $1,607 $0 $0 $0 $0 $0 $1,607
7967 Prewett Park Pool Resurfacing
Project Status:Under Construction General Fund $567 $0 $0 $0 $0 $0 $567 Unfunded $0 $130 $0 $0 $0 $0 $130
Total Funding $567 $130 $0 $0 $0 $0 $697
Community Facilities Insert Picture Here
*Funding amounts given in thousands of dollars II-1
Project No. Project Title Funding Source
Revised FY
25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31 Total Community Facilities Insert Picture Here
7969 Police Department Parking Lot Expansion
Project Status:Not Initiated Development Impact Fees $73 $0 $0 $0 $0 $0 $73 Total Funding $73 $0 $0 $0 $0 $0 $73
7970 Police Department Investigation Unit Remodel
Project Status:Not Initiated Development Impact Fees $85 $0 $0 $0 $0 $0 $85 Total Funding $85 $0 $0 $0 $0 $0 $85
7971 Emergency Operations Center Improvements
Project Status:Planning/Design StagePEG Franchise Fee $600 $0 $0 $0 $0 $0 $600 Total Funding $600 $0 $0 $0 $0 $0 $600
7976 Facility Maintenance and Repairs
Project Status:Ongoing Program Water Fund $0 $0 $150 $0 $0 $0 $150 General Fund $800 $195 $175 $100 $100 $100 $1,470
Unfunded $0 $100 $0 $305 $0 $0 $405
Total Funding $800 $295 $325 $405 $100 $100 $2,025
7989 Integration and Upgrade of Access Control, Surveillance, Monitoring, and Fire Alarm Project Status:Under Construction Recreation $20 $0 $0 $0 $0 $0 $20 Water Fund $195 $0 $0 $0 $0 $0 $195
Total Funding $215 $0 $0 $0 $0 $0 $215
7990 Installation of Police Department Radio Simulcast Tower Project Status:Planning/Design StageGeneral Fund $165 $0 $0 $0 $0 $0 $165 Total Funding $165 $0 $0 $0 $0 $0 $165
7991 Nick Rodriguez Community Center Rehab
Project Status:Under Construction State Grant - CNRA $2,162 $0 $0 $0 $0 $0 $2,162 General Fund $259 $0 $0 $0 $0 $0 $259
Total Funding $2,421 $0 $0 $0 $0 $0 $2,421
*Funding amounts given in thousands of dollars II-2
Project No. Project Title Funding Source
Revised FY
25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31 Total Community Facilities Insert Picture Here
8006 Finance & Human Resources Department Facility
Project Status:Planning/Design StageARPA $780 $0 $0 $0 $0 $0 $780 Capital Improvement Fund $200 $0 $0 $0 $0 $0 $200
Development Impact Fees $900 $0 $0 $0 $0 $0 $900
Total Funding $1,880 $0 $0 $0 $0 $0 $1,880
8011 Prewett Park Buildings Renovation
Project Status:Not Initiated General Fund $16 $0 $0 $0 $0 $0 $16 Unfunded $1,155 $0 $0 $0 $0 $0 $1,155
Total Funding $1,171 $0 $0 $0 $0 $0 $1,171
8012 Prewett Park Concrete Improvements, Phase 4
Project Status:Under Construction General Fund $630 $0 $0 $0 $0 $0 $630 Total Funding $630 $0 $0 $0 $0 $0 $630
8013 Prewett Park Mechanical and Structural Evaluation
Project Status:Not Initiated General Fund $50 $0 $0 $0 $0 $0 $50 Total Funding $50 $0 $0 $0 $0 $0 $50
8019 Prewett Water Park Prewett Peak Structure Remediation Project Status:Not Initiated Unfunded $0 $364 $0 $0 $0 $0 $364 Total Funding $0 $364 $0 $0 $0 $0 $364
8020 Prewett Water Park Mechanical Improvements
Project Status:Not Initiated General Fund $133 $0 $0 $0 $0 $0 $133 Total Funding $133 $0 $0 $0 $0 $0 $133
8021 Antioch Community Center Interior Painting
Project Status:Not Initiated Unfunded $50 $0 $0 $0 $0 $0 $50 Total Funding $50 $0 $0 $0 $0 $0 $50
8022 Dispatch Communications Center Improvements
Project Status:Not Initiated Unfunded $1,300 $300 $0 $0 $0 $0 $1,600 Total Funding $1,300 $300 $0 $0 $0 $0 $1,600
*Funding amounts given in thousands of dollars II-3
Project No. Project Title Funding Source
Revised FY
25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31 Total Community Facilities Insert Picture Here
8023 Property and Evidence Storage Building
Project Status:Not Initiated Development Impact Fees $300 $0 $0 $0 $0 $0 $300 Total Funding $300 $0 $0 $0 $0 $0 $300
8024 Police Department Records Area Remodel
Project Status:Not Initiated Unfunded $70 $0 $0 $0 $0 $0 $70 Total Funding $70 $0 $0 $0 $0 $0 $70
8025 Security Fencing at City Facilities
Project Status:Under Construction Water Fund $112 $0 $0 $0 $0 $0 $112 Delta Fair Fund $56 $0 $0 $0 $0 $0 $56
Total Funding $168 $0 $0 $0 $0 $0 $168
8027 Window Security at City Hall
Project Status:Not Initiated Unfunded $0 $0 $0 $50 $0 $0 $50 Total Funding $0 $0 $0 $50 $0 $0 $50
8028 Citywide Key Upgrades
Project Status:Not Initiated Unfunded $0 $250 $0 $250 $0 $0 $500 Total Funding $0 $250 $0 $250 $0 $0 $500
8030 Irrigation Controller Upgrades
Project Status:Not Initiated Unfunded $200 $200 $200 $200 $200 $200 $1,200 Total Funding $200 $200 $200 $200 $200 $200 $1,200
8032 Marina Pedestals Replacement
Project Status:Not Initiated Unfunded $0 $200 $0 $0 $0 $0 $200 Total Funding $0 $200 $0 $0 $0 $0 $200
8033 Marina Upgrades
Project Status:Ongoing Program Unfunded $150 $150 $150 $150 $150 $150 $900 Total Funding $150 $150 $150 $150 $150 $150 $900
8039 PD Dispatch / Real-Time Crime Center
Project Status:Not Initiated Unfunded $0 $1,000 $1,000 $1,000 $1,000 $0 $4,000 Total Funding $0 $1,000 $1,000 $1,000 $1,000 $0 $4,000
*Funding amounts given in thousands of dollars II-4
Project No. Project Title Funding Source
Revised FY
25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31 Total Community Facilities Insert Picture Here
8041 Antioch Community Center Roof Improvements
Project Status:Not Initiated Unfunded $0 $540 $0 $0 $0 $0 $540 Total Funding $0 $540 $0 $0 $0 $0 $540
8042 City Hall Roof Improvements
Project Status:Not Initiated Unfunded $0 $0 $345 $0 $0 $0 $345 Total Funding $0 $0 $345 $0 $0 $0 $345
8043 Antioch Police Department Roof Improvements
Project Status:Not Initiated Unfunded $0 $1,350 $0 $0 $0 $0 $1,350 Total Funding $0 $1,350 $0 $0 $0 $0 $1,350
8044 Public Works Roof Improvements
Project Status:Not Initiated Unfunded $0 $0 $490 $0 $0 $0 $490 Total Funding $0 $0 $490 $0 $0 $0 $490
8046 Carnegie Library Renovation
Project Status:Not Initiated Unfunded $200 $0 $0 $0 $0 $0 $200 Total Funding $200 $0 $0 $0 $0 $0 $200
Total Community Facilities Funding $13,437 $5,862 $2,615 $2,160 $1,555 $555 $26,184 *Funding amounts given in thousands of dollars II-5
Project No. Project Title Funding Source
Revised FY
25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31 Total 7026 Park Facilities Upgrade
Project Status:Ongoing Program Park-In-Lieu Fund $514 $500 $150 $150 $150 $150 $1,614 Total Funding $514 $500 $150 $150 $150 $150 $1,614
7945 Jacobsen Park Renovation
Project Status:Under Construction Park-In-Lieu Fund $562 $0 $0 $0 $0 $0 $562 Total Funding $562 $0 $0 $0 $0 $0 $562
7946 Marchetti Park Renovation
Project Status:Under Construction Park-In-Lieu Fund $1,192 $0 $0 $0 $0 $0 $1,192 Prop 68 Grant $248 $0 $0 $0 $0 $0 $248
General Fund $400 $0 $0 $0 $0 $0 $400
Total Funding $1,840 $0 $0 $0 $0 $0 $1,840
7983 Trail Maintenance Program
Project Status:Ongoing Program Gas Tax $235 $175 $175 $175 $175 $175 $1,110 Total Funding $235 $175 $175 $175 $175 $175 $1,110
7984 Community Park Synthetic Turf Replacement
Project Status:Not Initiated Unfunded $0 $2,200 $0 $0 $0 $0 $2,200 Total Funding $0 $2,200 $0 $0 $0 $0 $2,200
8007 Bicycle Garden Construction
Project Status:Planning/Design StageSS4A Grant $4,000 $0 $0 $0 $0 $0 $4,000 Development Impact Fees $895 $0 $0 $0 $0 $0 $895
Total Funding $4,895 $0 $0 $0 $0 $0 $4,895
8031 Playground Replacement Program
Project Status:Ongoing Program Unfunded $1,000 $1,000 $1,000 $1,000 $1,000 $1,000 $6,000 Total Funding $1,000 $1,000 $1,000 $1,000 $1,000 $1,000 $6,000 Total Parks & Trails Funding $9,045 $3,875 $1,325 $1,325 $1,325 $1,325 $18,220 Parks & Trails Insert Picture Here
*Funding amounts given in thousands of dollars II-6
Project No. Project Title Funding Source
Revised FY
25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31 Total 7355 Pedestrian/ADA Improvements
Project Status:Ongoing Program Measure J $1,581 $0 $500 $0 $500 $0 $2,581 Total Funding $1,581 $0 $500 $0 $500 $0 $2,581
7358 Sidewalk Repair Program
Project Status:Ongoing Program Gas Tax $258 $150 $150 $150 $150 $150 $1,008 Sewer Fund $258 $150 $150 $150 $150 $150 $1,008
Water Fund $258 $150 $150 $150 $150 $150 $1,008
Total Funding $775 $450 $450 $450 $450 $450 $3,025
7359 Pavement Management System Program
Project Status:Ongoing Program Gas Tax $115 $0 $30 $0 $30 $0 $175 Unfunded $0 $0 $70 $0 $70 $0 $140
Total Funding $115 $0 $100 $0 $100 $0 $315
7362 Pavement Surface Treatments
Project Status:Ongoing Program Measure J $308 $0 $200 $500 $0 $0 $1,008 RMRA $2,000 $0 $1,500 $0 $1,000 $0 $4,500
Total Funding $2,308 $0 $1,700 $500 $1,000 $0 $5,508
7363 Hillcrest Ave. Left Turn at Wild Horse Road
Project Status:Not Initiated Assessment District 26 $0 $350 $0 $0 $0 $0 $350 Total Funding $0 $350 $0 $0 $0 $0 $350
7448 Transportation Impact Fee Study
Project Status:Ongoing Program Measure J $41 $45 $0 $0 $0 $0 $86 Total Funding $41 $45 $0 $0 $0 $0 $86
7921 Citywide Signage Program
Project Status:Ongoing Program General Fund $418 $0 $0 $0 $0 $0 $418 Unfunded $0 $500 $500 $0 $0 $0 $1,000
Total Funding $418 $500 $500 $0 $0 $0 $1,418
Roadway Improvements Insert Picture Here
*Funding amounts given in thousands of dollars II-7
Project No. Project Title Funding Source
Revised FY
25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31 Total Roadway Improvements Insert Picture Here
7922 Traffic Calming Program
Project Status:Ongoing Program Measure J $530 $250 $250 $250 $250 $250 $1,780 Gas Tax $100 $100 $100 $100 $100 $100 $600
Total Funding $630 $350 $350 $350 $350 $350 $2,380
7925 L Street Improvements
Project Status:Planning/Design StageRMRA $5,224 $0 $0 $0 $0 $0 $5,224 Measure J $1,192 $0 $0 $0 $0 $0 $1,192
OBAG2 $1,468 $0 $0 $0 $0 $0 $1,468
SS4A Grant $13,008 $0 $0 $0 $0 $0 $13,008
Total Funding $20,893 $0 $0 $0 $0 $0 $20,893
7940 Pavement Plugs and Leveling Courses
Project Status:Under Construction RMRA $2,380 $2,500 $0 $2,000 $0 $2,000 $8,880 Total Funding $2,380 $2,500 $0 $2,000 $0 $2,000 $8,880
7941 Streetlighting Improvements
Project Status:Under Construction Gas Tax $464 $0 $0 $0 $0 $0 $464 Unfunded $1,100 $1,000 $0 $0 $0 $0 $2,100
Total Funding $1,564 $1,000 $0 $0 $0 $0 $2,564
7943 Median Island Improvements
Project Status:Ongoing Program Gas Tax $800 $400 $400 $400 $400 $400 $2,800 Measure J $735 $550 $550 $550 $550 $550 $3,485
Total Funding $1,535 $950 $950 $950 $950 $950 $6,285
8009 Antioch School Pedestrian Safety Improvements
Project Status:Ongoing Program Gas Tax $100 $50 $50 $50 $50 $50 $350 TDA Grant $0 $100 $0 $0 $0 $0 $100
Unfunded $50 $50 $50 $50 $50 $50 $300
Total Funding $150 $200 $100 $100 $100 $100 $750
*Funding amounts given in thousands of dollars II-8
Project No. Project Title Funding Source
Revised FY
25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31 Total Roadway Improvements Insert Picture Here
8034 James Donlon Traffic Calming
Project Status:Not Initiated Gas Tax $865 $0 $0 $0 $0 $0 $865 Total Funding $865 $0 $0 $0 $0 $0 $865
8035 Sycamore Traffic Calming
Project Status:Planning/Design StageGas Tax $425 $0 $0 $0 $0 $0 $425 Total Funding $425 $0 $0 $0 $0 $0 $425
8036 West Tenth Street Traffic Calming
Project Status:Not Initiated Gas Tax $220 $0 $0 $0 $0 $0 $220 Total Funding $220 $0 $0 $0 $0 $0 $220
8045 Slatten Ranch Road, Phase I
Project Status:Not Initiated East LT Spec Plan Ben District $0 $0 $2,800 $6,000 $2,500 $0 $11,300 ECCRFFA $0 $0 $1,200 $4,000 $3,500 $0 $8,700
Unfunded $0 $0 $0 $0 $6,000 $8,000 $14,000
Total Funding $0 $0 $4,000 $10,000 $12,000 $8,000 $34,000 Total Roadway Improvements Funding $33,899 $6,345 $8,650 $14,350 $15,450 $11,850 $90,544 *Funding amounts given in thousands of dollars II-9
Project No. Project Title Funding Source
Revised FY
25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31 Total 7447 Traffic Signal: James Donlon Blvd./Metcalf St
Project Status:Not Initiated Traffic Signal Fund $0 $0 $0 $400 $0 $0 $400 Total Funding $0 $0 $0 $400 $0 $0 $400
7977 Traffic Signal: Heidorn Ranch Road/Prewett Ranch Drive Project Status:Planning/Design StageTraffic Signal Fund $0 $395 $0 $0 $0 $0 $395 Total Funding $0 $395 $0 $0 $0 $0 $395
8014 Trail Crossing Improvements
Project Status:Planning/Design StageHSIP Grant $828 $0 $0 $0 $0 $0 $828 Traffic Signal Fund $89 $0 $0 $0 $0 $0 $89
Total Funding $917 $0 $0 $0 $0 $0 $917
8015 Signal System Upgrade at Various Locations
Project Status:Planning/Design StageHSIP Grant $2,521 $0 $0 $0 $0 $0 $2,521 Traffic Signal Fund $274 $0 $0 $0 $0 $0 $274
Total Funding $2,795 $0 $0 $0 $0 $0 $2,795
8029 Countywide Smart Signals
Project Status:Planning/Design StageGas Tax $50 $0 $0 $0 $0 $0 $50 Measure J $65 $0 $0 $0 $0 $0 $65
OBAG3 $2,514 $0 $0 $0 $0 $0 $2,514
Total Funding $2,629 $0 $0 $0 $0 $0 $2,629
Total Traffic Signals Funding $6,342 $395 $0 $400 $0 $0 $7,137 Traffic Signals Insert Picture Here
*Funding amounts given in thousands of dollars II-10
Project No. Project Title Funding Source
Revised FY
25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31 Total 7724 Sewer Main Improvements Program
Project Status:Ongoing Program Sewer System Improvement Fund $150 $150 $2,000 $150 $1,000 $150 $3,600 Total Funding $150 $150 $2,000 $150 $1,000 $150 $3,600
7736 Sewer Facility Rehabilitation Program
Project Status:Ongoing Program Sewer Fund $75 $75 $75 $75 $75 $75 $450 Total Funding $75 $75 $75 $75 $75 $75 $450
7745 Northeast Antioch Annexation Infrastructure
Project Status:Not Initiated NE Annexation $0 $1,998 $0 $0 $0 $0 $1,998 Unfunded $0 $0 $1,500 $0 $0 $0 $1,500
Total Funding $0 $1,998 $1,500 $0 $0 $0 $3,498
7750 Trash Capture Devices
Project Status:Ongoing Program NPDES $200 $100 $100 $100 $100 $100 $700 Total Funding $200 $100 $100 $100 $100 $100 $700
7923 Sewer Main Trenchless Rehabilitation
Project Status:Ongoing Program Sewer System Improvement Fund $50 $150 $150 $150 $150 $150 $800 Total Funding $50 $150 $150 $150 $150 $150 $800
7993 East Antioch Creek Outfall Improvements
Project Status:Planning/Design StageSewer System Improvement Fund $1,000 $0 $0 $0 $0 $0 $1,000 Total Funding $1,000 $0 $0 $0 $0 $0 $1,000
8038 Sewer System Master Plan Update
Project Status:Planning/Design StageSewer Fund $700 $0 $0 $0 $0 $0 $700 Total Funding $700 $0 $0 $0 $0 $0 $700
Total Wastewater & Storm Drain System Funding $2,175 $2,473 $3,825 $475 $1,325 $475 $10,748 Wastewater & Storm Drain System Insert Picture Here
*Funding amounts given in thousands of dollars II-11
Project No. Project Title Funding Source
Revised FY
25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31 Total 7628 Water Main Replacement Program
Project Status:Ongoing Program Water System Improvement Fund $2,500 $0 $2,000 $0 $2,000 $0 $6,500 Total Funding $2,500 $0 $2,000 $0 $2,000 $0 $6,500
7670 Water Treatment Plant Operations
Project Status:Ongoing Program Water Fund $500 $0 $500 $0 $500 $0 $1,500 Total Funding $500 $0 $500 $0 $500 $0 $1,500
7672 Water Studies and Planning
Project Status:Ongoing Program Water Fund $828 $500 $425 $200 $300 $300 $2,553 Total Funding $828 $500 $425 $200 $300 $300 $2,553
7674 Storage Reservoir Rehabilitation
Project Status:Not Initiated Water Fund $0 $1,600 $1,500 $0 $0 $800 $3,900 Total Funding $0 $1,600 $1,500 $0 $0 $800 $3,900
7675 Water Treatment Plant Improvements
Project Status:Ongoing Program Water Fund $787 $500 $450 $500 $450 $500 $3,187 Total Funding $787 $500 $450 $500 $450 $500 $3,187
7682 Water Treatment Plant Solids Handling Improvements Project Status:Planning/Design StageWater Fund $1,189 $0 $250 $0 $0 $0 $1,439 Total Funding $1,189 $0 $250 $0 $0 $0 $1,439
7684 Water Treatment Plant Drainage Capture
Project Status:Not Initiated Water Fund $0 $0 $200 $0 $0 $0 $200 Total Funding $0 $0 $200 $0 $0 $0 $200
7697 Water Treatment Plant Electrical Upgrade
Project Status:Planning/Design StageWater Fund $1,350 $0 $1,000 $0 $0 $0 $2,350 Total Funding $1,350 $0 $1,000 $0 $0 $0 $2,350
7699 Brackish Water Desalination
Project Status:Under Construction Water Fund $4,537 $0 $0 $0 $0 $0 $4,537 Total Funding $4,537 $0 $0 $0 $0 $0 $4,537
Water System Insert Picture Here
*Funding amounts given in thousands of dollars II-12
Project No. Project Title Funding Source
Revised FY
25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31 Total Water System Insert Picture Here
7935 Re-Coating Surface of Clearwells and Fluoride Storage Project Status:Not Initiated Water Fund $0 $0 $300 $0 $0 $0 $300 Total Funding $0 $0 $300 $0 $0 $0 $300
7937 Pittsburg / Antioch Water Intertie
Project Status:Not Initiated Water Fund $0 $775 $0 $0 $0 $0 $775 Total Funding $0 $775 $0 $0 $0 $0 $775
7952 Parallel Raw Water Pipeline
Project Status:Not Initiated Water Fund $0 $0 $0 $0 $0 $2,000 $2,000 Total Funding $0 $0 $0 $0 $0 $2,000 $2,000
7978 Water Treatment Plant HVAC Systems
Project Status:Not Initiated Water Fund $0 $0 $1,500 $0 $0 $0 $1,500 Total Funding $0 $0 $1,500 $0 $0 $0 $1,500
7979 Water Treatment Plant B Flash Mixers
Project Status:Not Initiated Water Fund $0 $0 $0 $0 $0 $500 $500 Total Funding $0 $0 $0 $0 $0 $500 $500
7980 Water Treatment Plant B Solar Covers
Project Status:Not Initiated Water Fund $0 $0 $0 $0 $500 $0 $500 Total Funding $0 $0 $0 $0 $500 $0 $500
7981 Water Treatment Plant B Improvements
Project Status:Not Initiated Water Fund $0 $500 $0 $500 $0 $500 $1,500 Total Funding $0 $500 $0 $500 $0 $500 $1,500
7992 AMI Water Meter Reading Upgrade
Project Status:Under Construction Water Fund $1,876 $1,500 $0 $0 $0 $0 $3,376 Total Funding $1,876 $1,500 $0 $0 $0 $0 $3,376
*Funding amounts given in thousands of dollars II-13
Project No. Project Title Funding Source
Revised FY
25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31 Total Water System Insert Picture Here
7997 Water Treatment Plant Variable Frequency Drives
Project Status:Not Initiated Water Fund $0 $0 $0 $500 $0 $0 $500 Total Funding $0 $0 $0 $500 $0 $0 $500
8002 Water Treatment Plant Generator Replacement
Project Status:Not Initiated Water Fund $0 $0 $900 $0 $0 $0 $900 Total Funding $0 $0 $900 $0 $0 $0 $900
8003 Canal Pump Variable Frequency Drives
Project Status:Not Initiated Water Fund $0 $300 $0 $0 $0 $0 $300 Total Funding $0 $300 $0 $0 $0 $0 $300
8004 Lone Tree Way Booster Pump Improvements
Project Status:Not Initiated Water Fund $1,100 $0 $0 $0 $0 $0 $1,100 Total Funding $1,100 $0 $0 $0 $0 $0 $1,100
8017 Reservoir Road Rehabilitation
Project Status:Not Initiated Water Fund $550 $0 $700 $0 $0 $0 $1,250 Total Funding $550 $0 $700 $0 $0 $0 $1,250
8040 Removal of Underground Storage Tank
Project Status:Not Initiated Water Fund $0 $0 $0 $2,500 $0 $0 $2,500 Total Funding $0 $0 $0 $2,500 $0 $0 $2,500
Total Water System Funding $15,217 $5,675 $9,725 $4,200 $3,750 $4,600 $43,167 *Funding amounts given in thousands of dollars II-14
7026
Location: Citywide
Project Manager: Carlos Zepeda
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Park-In-Lieu Fund 513,586 $ 500,000$ 150,000$ 150,000$ 150,000$ 150,000$ 1,613,586$ TOTAL 513,586$ 500,000$ 150,000$ 150,000$ 150,000$ 150,000$ 1,613,586$ Funding Sources Proposed Total
Parks & Trails
Park Facilities Upgrade
Insert Picture here
Project Description: This project will rehabilitate and upgrade aging park playground equipment and facilities throughout the City.

Justification: Upgrades to community parks help maintain a healthy community.

7355
Location: Citywide
Project Manager: Scott Buenting
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Measure J 1,580,577 $ - $ 500,000$ - $ 500,000$ - $ 2,580,577$ TOTAL 1,580,577$ - $ 500,000$ - $ 500,000$ - $ 2,580,577$ Funding Sources Proposed Total
Roadway Improvements
Pedestrian/ADA Improvements
Insert Picture here
Project Description: This project will construct new curb ramps in conformance with State and American with Disability Act guidelines and replace damaged sidewalks.

Justification: The project will improve pedestrian access by installing curb ramps and reducing hazards in the public right of way.

7358
Location: Citywide
Project Manager: Mitchell Loving
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Gas Tax 258,202 $ 150,000$ 150,000$ 150,000$ 150,000$ 150,000$ 1,008,202$ Sewer Fund 258,202 $ 150,000$ 150,000$ 150,000$ 150,000$ 150,000$ 1,008,202$ Water Fund 258,202 $ 150,000$ 150,000$ 150,000$ 150,000$ 150,000$ 1,008,202$ TOTAL 774,606$ 450,000$ 450,000$ 450,000$ 450,000$ 450,000$ 3,024,606$ Funding Sources Proposed Total
Roadway Improvements
Sidewalk Repair Program
Insert Picture here
Project Description: This program will replace concrete sidewalks, curb and gutter that have been damaged by tree roots or broken as part of an underground utility repair. The program also installs new curb ramps to improve pedestrian accessibility.

Justification: Overgrown tree roots and repairs to underground utilities damage sections of concrete curb, gutter, and sidewalk.

The program helps to mitigate risks of trip and fall incidents throughout the City.

7359
Location: Citywide
Project Manager: Scott Buenting
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Gas Tax 114,512 $ - $ 30,000$ - $ 30,000$ - $ 174,512$ Unfunded - $ - $ 70,000$ - $ 70,000$ - $ 140,000$ TOTAL 114,512$ - $ 100,000$ - $ 100,000$ - $ 314,512$ Funding Sources Proposed Total
Roadway Improvements
Pavement Management System Program
Insert Picture here
Project Description: This program evaluates City streets every two years based on pavement condition and provides pavement repair options. The City will seek a federal grant, P-TAP (Pavement Management Technical Assistant Program) to assist with the program.

Justification: A Pavement Management Plan is required as a condition of Measure "J" funding for street improvements. P-TAP Funding is often available for this work.

7362
Location: Citywide
Project Manager: Scott Buenting
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Measure J 308,053 $ - $ 200,000$ 500,000$ - $ - $ 1,008,053$ RMRA 2,000,000 $ - $ 1,500,000$ - $ 1,000,000$ - $ 4,500,000$ TOTAL 2,308,053$ - $ 1,700,000$ 500,000 $ 1,000,000$ - $ 5,508,053$ Funding Sources Proposed Total
Roadway Improvements
Pavement Surface Treatments
Insert Picture here
Project Description: This program provides pavement preservation treatments such as cape seal, micro-surfacing and other preventative maintenance treatments to extend the useful life of a roadway.

Justification: The program implements the Pavement Management System program and recommendations from residents.

7363
Location: Hillcrest Avenue at Wildhorse Road
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Assessment District 26 - $ 350,000$ - $ - $ - $ - $ 350,000$ TOTAL -$ 350,000$ - $ - $ - $ - $ 350,000$ Funding Sources Proposed Total
Roadway Improvements
Hillcrest Ave. Left Turn at Wild Horse Road
Insert Picture here
Project Description: This project will extend the Hillcrest Avenue left turn pocket at Wildhorse Road.

Justification: Additional capacity is necessary for build out of the development to the east and future extension of Wild Horse Road to Slatten Ranch Road.

7447
Location: The intersection at James Donlon Boulevard and Metcalf Street Project Manager: Scott Buenting
Estimated Completion: 2029
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Traffic Signal Fund - $ - $ - $ 400,000$ - $ - $ 400,000$ TOTAL -$ - $ - $ 400,000$ - $ - $ 400,000$ Funding Sources Proposed Total
Traffic Signals
Traffic Signal: James Donlon Blvd./Metcalf St
Insert Picture here
Project Description: This project will install a new traffic signal and related facilities at the intersection of James Donlon Blvd. /Metcalf Street.

Justification: This facility is expected to improve traffic safety in the area following additional development.

7448
Location: Citywide
Project Manager: Scott Buenting
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Measure J 41,000 $ 45,000$ - $ - $ - $ - $ 86,000$ TOTAL 41,000$ 45,000$ - $ - $ - $ - $ 86,000$ Funding Sources Proposed Total
Roadway Improvements
Transportation Impact Fee Study
Insert Picture here
Project Description: This study will update the traffic impact fee program.

Justification: This study is used to assist with financing transportation improvements needed to support new development and redevelopment activities throughout the City.

7628
Location: Citywide
Project Manager: Scott Buenting
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water System Improvement Fund2,500,000$ - $ 2,000,000$ - $ 2,000,000$ - $ 6,500,000$ TOTAL 2,500,000$ - $ 2,000,000$ - $ 2,000,000$ - $ 6,500,000$ Funding Sources Proposed Total
Water System
Water Main Replacement Program
Insert Picture here
Project Description: This program replaces deteriorated water facilities to improve efficiency in the existing system as identified in the Water System Master Plan or as requested by the Water Distribution Division.

Justification: Portions of the existing water system are aging and/or have experienced failures due to deterioration and need replacement and upgrades.

7670
Location: Water Treatment Plant
Project Manager: Marcus Woodland
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund 500,000 $ - $ 500,000$ - $ 500,000$ - $ 1,500,000$ TOTAL 500,000$ - $ 500,000$ - $ 500,000$ - $ 1,500,000$ Funding Sources Proposed Total
Water System
Water Treatment Plant Operations
Insert Picture here
Project Description: This project will replace the granular activated carbon filters of both Plant "A" and "B".

Justification: The granular activated carbon filters must be replaced every four to five years to perform efficiently.

7672
Location: Citywide
Project Manager: Scott Buenting
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund 828,034 $ 500,000$ 425,000$ 200,000$ 300,000$ 300,000$ 2,553,034$ TOTAL 828,034$ 500,000$ 425,000$ 200,000$ 300,000$ 300,000$ 2,553,034$ Funding Sources Proposed Total
Water System
Water Studies and Planning
Insert Picture here
Project Description: This project will prepare and update various water studies and planning documents including the Water System Master Plan, Water Rate Study, Risk Management Plan, Urban Water Management Plan Update, Watershed Sanitary Survey Update, Groundwater Sustainability Plan, Integrated Regional Water Management Plan, Risk Resilience Assessment and Emergency Response Plan.

Justification: Various water related studies and planning documents must be completed for the City to be compliant with State and industry requirements.

7674
Location: Citywide
Project Manager: Scott Buenting
Estimated Completion: 2030
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund - $ 1,600,000$ 1,500,000$ - $ - $ 800,000$ 3,900,000$ TOTAL -$ 1,600,000$ 1,500,000$ - $ - $ 800,000$ 3,900,000$ Funding Sources Proposed Total
Water System
Storage Reservoir Rehabilitation
Insert Picture here
Project Description: This project rehabilitates water storage reservoirs throughout the City. Work to be performed may include recoating, repainting, installation of mixers and sampling stations and seismic upgrades.

Justification: Maintenance and upgrades of water storage reservoirs are necessary to prolong their useful lives.

7675
Location: Water Treatment Plant
Project Manager: Marcus Woodland
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund 787,341 $ 500,000$ 450,000$ 500,000$ 450,000$ 500,000$ 3,187,341$ TOTAL 787,341$ 500,000$ 450,000$ 500,000$ 450,000$ 500,000$ 3,187,341$ Funding Sources Proposed Total
Water System
Water Treatment Plant Improvements
Insert Picture here
Project Description: This project will perform minor improvements at the Water Treatment Plant. The work may include replacement of deteriorating equipment, installation of new controls, construction of facilities, clearwell improvements.

Justification: Upgrades to the plant are required to maintain and/or improve the efficiency of the facility.

7682
Location: Water Treatment Plant
Project Manager: Marcus Woodland
Estimated Completion: 2029
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund 1,188,996$ - $ 250,000$ - $ - $ - $ 1,438,996$ TOTAL 1,188,996$ - $ 250,000$ - $ - $ - $ 1,438,996$ Funding Sources Proposed Total
Water System
Water Treatment Plant Solids Handling Improvements
Insert Picture here
Project Description: This project will evaluate the existing solids handling and dewatering operation at the Water Treatment Plant and, if warranted, design and construct additional facilities.

Justification: Solids handling and dewatering are currently performed by a private contractor. This exercise will determine if a City owned system may be more cost effective.

7684
Location: Water Treatment Plant
Project Manager: Scott Buenting
Estimated Completion: 2028
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund - $ - $ 200,000$ - $ - $ - $ 200,000$ TOTAL -$ - $ 200,000$ - $ - $ - $ 200,000$ Funding Sources Proposed Total
Water System
Water Treatment Plant Drainage Capture
Insert Picture here
Project Description: This project will re-evaluate the existing sludge lagoon. This project may include removal of accumulated solids, stabilization of banks and installation of decant/disposal system or constructing a new City owned facility.

Justification: The City may require additional capacity to accommodate emptying the clarifiers for routine or special maintenance.

7697
Location: Water Treatment Plant
Project Manager: Scott Buenting
Estimated Completion: 2028
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund 1,350,000 $ - $ 1,000,000$ - $ - $ - $ 2,350,000$ TOTAL 1,350,000$ - $ 1,000,000$ - $ - $ - $ 2,350,000$ Funding Sources Proposed Total
Water System
Water Treatment Plant Electrical Upgrade
Insert Picture here
Project Description: The project will relocate and upgrade the aging electric facilities at the Water Treatment Plant.

Justification: Electrical equipment is aging and requires upgrades to continue to function properly.

7699
Location: Water Treatment Plant
Project Manager: Scott Buenting
Estimated Completion: 2025
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund 4,537,070 $ - $ - $ - $ - $ - $ 4,537,070$ TOTAL 4,537,070$ - $ - $ - $ - $ - $ 4,537,070$ Funding Sources Proposed Total
Water System
Brackish Water Desalination
Insert Picture here
Project Description: This project will construct a 6 MGD brackish water desalination plant that would treat water from the San Joaquin River during times of high chloride content. The work will include the replacement of the City’s river intake facility and install a new fish Justification: This process will enable the City the ability to treat river water in times of drought and future dry conditions due to climate change and protect the City’s Pre‐1914 water rights.

7724
Location: Citywide
Project Manager: Scott Buenting
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Sewer System Improvement Fund 150,000$ 150,000$ 2,000,000$ 150,000 $ 1,000,000$ 150,000 $ 3,600,000$ TOTAL 150,000$ 150,000$ 2,000,000$ 150,000 $ 1,000,000$ 150,000 $ 3,600,000$ Funding Sources Proposed Total
Wastewater & Storm Drain System
Sewer Main Improvements Program
Insert Picture here
Project Description: Improvements to the existing sanitary sewer collection system are needed to increase functionality or expand capacity.

Justification: The Wastewater System Collection Master Plan and the Public Works Department have identified existing sewer lines to be upgraded.

7736
Location: Citywide
Project Manager: Scott Buenting
Estimated Completion: Ongoing Program
Project Description: This program rehabilitates damaged and deteriorating sewer collection facilities.

Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Sewer Fund 75,000 $ 75,000$ 75,000$ 75,000$ 75,000$ 75,000$ 450,000$ TOTAL 75,000$ 75,000$ 75,000$ 75,000$ 75,000$ 75,000$ 450,000$ Wastewater & Storm Drain System
Sewer Facility Rehabilitation Program
Insert Picture here - Update Photo
Justification: These improvements reduce maintenance cost, prevent overflows, and improve sewer flow capacity.

Funding Sources Proposed Total

7745
Location: Northeast Annexation area
Project Manager: Scott Buenting
Estimated Completion: 2028
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 NE Annexation - $ 1,998,000$ - $ - $ - $ - $ 1,998,000$ Unfunded - $ - $ 1,500,000$ - $ - $ - $ 1,500,000$ TOTAL -$ 1,998,000$ 1,500,000$ - $ - $ - $ 3,498,000$ Funding Sources Proposed Total
Wastewater & Storm Drain System
Northeast Antioch Annexation Infrastructure
Insert Picture here
Project Description: This project will construct new underground facilities and provide additional infrastructure on St. Claire Dr, Trembath Lane, Viera Ave, Stewart Lane, Vine Lane, Bown Ave, Walnut Ave, Santa Fe Ave, and Wilbur Ave.

Justification: Domestic water and sanitary sewer facilities have been installed in some of these areas. Additional work may include storm water collection, curb, gutter and sidewalk and street lighting.

7750
Location: Citywide
Project Manager: Scott Buenting
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 NPDES 200,000 $ 100,000$ 100,000$ 100,000$ 100,000$ 100,000$ 700,000$ TOTAL 200,000$ 100,000$ 100,000$ 100,000$ 100,000$ 100,000$ 700,000$ Funding Sources Proposed Total
Wastewater & Storm Drain System
Trash Capture Devices
Insert Picture here
Project Description: This program will install full trash capture devices at various locations throughout the City to prevent trash from reaching the storm drain system, channels, creeks, and San Joaquin River. Locations will be determined depending on the type of device selected.

Justification: To provide compliance with Provision C.10 the City's MS4 National Pollutant Discharge Elimination System stormwater permit (R2-2015-0049; as amended by R2-2019-0004).

7921
Location: Citywide
Project Manager: Scott Buenting
Estimated Completion: 2028
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 General Fund 417,649 $ - $ - $ - $ - $ - $ 417,649$ Unfunded - $ 500,000$ 500,000$ - $ - $ - $ 1,000,000$ TOTAL 417,649$ 500,000$ 500,000$ - $ - $ - $ 1,417,649$ Funding Sources Proposed Total
Roadway Improvements
Citywide Signage Program
Insert Picture here
Project Description: This program includes designing and installing park facility, location and point of interest signs throughout the City.

Justification: The program will enlighten residents and visitors of numerous parks, facilities, and attractions within the City.

7922
Location: Citywide
Project Manager: Mitchell Loving
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Measure J 530,175 $ 250,000$ 250,000$ 250,000$ 250,000$ 250,000$ 1,780,175$ Gas Tax 100,000 $ 100,000$ 100,000$ 100,000$ 100,000$ 100,000$ 600,000$ TOTAL 630,175$ 350,000$ 350,000$ 350,000$ 350,000$ 350,000$ 2,380,175$ Funding Sources Proposed Total
Roadway Improvements
Traffic Calming Program
Insert Picture here
Project Description: This program implements traffic calming strategies on roadways that have been identified by residents and confirmed by the City Engineer.

Justification: Excessive speed on residential roadways is a safety concern. This program strives to reduce the risks of traffic accidents throughout the City.

7923
Location: Citywide
Project Manager: Scott Buenting
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Sewer System Improvement Fund 50,000$ 150,000$ 150,000$ 150,000$ 150,000$ 150,000$ 800,000$ TOTAL 50,000$ 150,000$ 150,000$ 150,000$ 150,000$ 150,000$ 800,000$ Funding Sources Proposed Total
Wastewater & Storm Drain System
Sewer Main Trenchless Rehabilitation
Insert Picture here
Project Description: This program rehabilitates damaged and deteriorated sanitary sewer pipelines utilizing trenchless methods such as pipe bursting and cured in-place pipe installation.

Justification: Portions of the existing sanitary sewer collection system are damaged or deteriorating and need replacement and upgrades.

Trenchless rehabilitation of sanitary sewer pipelines is much less expensive than replacement of the pipeline due to the small excavation required to access the pipelines and minimum damage to the ground surface.

7925
Location: L Street between Highway 4 and the Antioch Marina Project Manager: Scott Buenting
Estimated Completion: 2028
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 RMRA 5,224,167 $ - $ - $ - $ - $ - $ 5,224,167$ Measure J 1,192,350 $ - $ - $ - $ - $ - $ 1,192,350$ OBAG2 1,468,115 $ - $ - $ - $ - $ - $ 1,468,115$ SS4A Grant 13,008,000$ - $ - $ - $ - $ - $ 13,008,000$ TOTAL 20,892,632$ - $ - $ - $ - $ - $ 20,892,632$ Funding Sources Proposed Total
Roadway Improvements
L Street Improvements
Insert Picture here
Project Description: This project will consist of modifying and widening portions of the roadway, constructing new concrete curb, gutter, sidewalks and curb cuts, installing landscaping and decorative hardscape, improve bicycle access and upgrading signage and striping throughout the project. The project will be constructed in 2 phases. Phase 1 is Hwy 4 to Sycamore and W 10th to Marina.

Phase 2 is Sycamore to W 10th.

Justification: Improve pedestrian and bicycle safety, traffic flow and aesthetics from Highway 4 to the Marina and the Rivertown District.

7928
Location: 100 I Street
Project Manager: Scott Buenting
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Gas Tax 374,894 $ - $ - $ - $ - $ - $ 374,894$ TOTAL 374,894$ - $ - $ - $ - $ - $ 374,894$ Funding Sources Proposed Total
Community Facilities
Amtrak Station Improvements
Insert Picture here
Project Description: This project will install landscaping, hardscaping, and benches at the current train station.

Justification: The non-operational ticket booth and bathroom have been demolished and this project will improve usage and beautify the area for better use.

7929
Location: Antioch Marina
Project Manager: Carlos Zepeda
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Tidelands AB1900 75,000 $ - $ - $ - $ - $ - $ 75,000$ Unfunded - $ 425,000$ - $ - $ - $ - $ 425,000$ TOTAL 75,000$ 425,000$ - $ - $ - $ - $ 500,000$ Funding Sources Proposed Total
Community Facilities
Marina Basin Dredging
Insert Picture here
Project Description: This project will remove sediment within the Marina basin to maintain an appropriate depth throughout the marina berths and waterway.

Justification: If proper depths are not maintained berths become silted and unusable resulting in a loss of revenue for the marina and loss of rentable spaces for residents.

7935
Location: Water Treatment Plant
Project Manager: Marcus Woodland
Estimated Completion: 2028
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund - $ - $ 300,000$ - $ - $ - $ 300,000$ TOTAL -$ - $ 300,000$ - $ - $ - $ 300,000$ Funding Sources Proposed Total
Water System
Re-Coating Surface of Clearwells and Fluoride Storage
Insert Picture here
Project Description: The project will re-coat the top surface of the Plant “B” clearwell and the fluoride bulk tank.

Justification: Maintaining protective coating increases the life expectancy of the facilities by sealing the surface.

7937
Location: Intersection of Delta Fair Blvd. and E. Leland Rd.

Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund - $ 775,000$ - $ - $ - $ - $ 775,000$ TOTAL -$ 775,000$ - $ - $ - $ - $ 775,000$ Funding Sources Proposed Total
Water System
Pittsburg / Antioch Water Intertie
Insert Picture here
Project Description: This project will improve the connections between the City of Antioch and City of Pittsburg’s water systems.

Justification: The current intertie is unreliable and in the event of an emergency, a reliable interconnection between the cities of Antioch and Pittsburg should be established to help maintain water supply.

7940
Location: Citywide
Project Manager: Mitchell Loving
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 RMRA 2,380,390 $ 2,500,000$ - $ 2,000,000$ - $ 2,000,000$ 8,880,390$ TOTAL 2,380,390$ 2,500,000$ - $ 2,000,000$ - $ 2,000,000$ 8,880,390$ Funding Sources Proposed Total
Roadway Improvements
Pavement Plugs and Leveling Courses
Insert Picture here
Project Description: This program prepares roadways to receive a full street width surface treatment such as a Cape Seal or micro- surfacing by constructing asphalt concrete plugs and leveling courses typically within the driving lanes.

Justification: Roadway rehabilitation utilizing asphalt concrete plugs and leveling courses in conjunction with a surface treatment is a cost-effective way of extending the useful life of a roadway.

7941
Location: Citywide
Project Manager: Carlos Zepeda
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Gas Tax 463,550 $ - $ - $ - $ - $ - $ 463,550$ Unfunded 1,100,000 $ 1,000,000$ - $ - $ - $ - $ 2,100,000$ TOTAL 1,563,550$ 1,000,000$ - $ - $ - $ - $ 2,563,550$ Funding Sources Proposed Total
Roadway Improvements
Streetlighting Improvements
Insert Picture here
Project Description: This project will survey the existing street lighting throughout the City and implement improvements to increase safety and decrease energy usage.

Justification: Street lighting is inconsistent in various areas. Evaluating the existing conditions and implementing improvements increases public safety.

7943
Location: Citywide
Project Manager: Carlos Zepeda
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Gas Tax 800,000 $ 400,000$ 400,000$ 400,000$ 400,000$ 400,000$ 2,800,000$ Measure J 735,376 $ 550,000$ 550,000$ 550,000$ 550,000$ 550,000$ 3,485,376$ TOTAL 1,535,376$ 950,000 $ 950,000$ 950,000$ 950,000$ 950,000$ 6,285,376$ Funding Sources Proposed Total
Roadway Improvements
Median Island Improvements
Insert Picture here
Project Description: This project will improve existing median islands by installing low maintenance landscape and decorative hardscape in various locations throughout the City.

Justification: These improvements will improve median islands with beautiful vegetation and decorative hardscape that will enhance the street scape aesthetics.

7945
Location: Jacobsen Park
Project Manager: Scott Buenting
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Park-In-Lieu Fund 561,912 $ - $ - $ - $ - $ - $ 561,912$ TOTAL 561,912$ - $ - $ - $ - $ - $ 561,912$ Funding Sources Proposed Total
Parks & Trails
Jacobsen Park Renovation
Insert Picture here
Project Description: This project will renovate Jacobsen Park including replacing aging playground equipment and rehabilitating existing fields and courts.

Justification: The facilities and amenities within this park are aging and deteriorated.

7946
Location: Marchetti Park
Project Manager: Scott Buenting
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Park-In-Lieu Fund 1,192,278$ - $ - $ - $ - $ - $ 1,192,278$ Prop 68 Grant 247,566 $ - $ - $ - $ - $ - $ 247,566$ General Fund 400,000 $ - $ - $ - $ - $ - $ 400,000$ TOTAL 1,839,844$ - $ - $ - $ - $ - $ 1,839,844$ Funding Sources Proposed Total
Parks & Trails
Marchetti Park Renovation
Project Description: This project will renovate Marchetti Park including replacing aging playground equipment and rehabilitating existing fields and courts.

Justification: The facilities and amenities within this park are aging and deteriorated.

7948
Location: Citywide
Project Manager: Carlos Zepeda
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 General Fund 46,648 $ - $ - $ - $ - $ - $ 46,648$ Unfunded 25,000 $ 25,000$ 25,000$ 25,000$ 25,000$ 25,000$ 150,000$ TOTAL 71,648$ 25,000$ 25,000$ 25,000$ 25,000$ 25,000$ 196,648$ Funding Sources Proposed Total
Community Facilities
Restoration of Public Art
Insert Picture here
Project Description: This project will include the restoration of various public art pieces throughout the City.

Justification: Many art pieces within the City are deteriorating or have been damaged and are in need of restoration.

7949
Location: Prewett Park
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 AD 27/31 - $ 74,000$ - $ - $ - $ - $ 74,000$ Gas Tax - $ 30,000$ - $ - $ - $ - $ 30,000$ General Fund - $ 35,000$ - $ - $ - $ - $ 35,000$ Unfunded - $ 414,000$ - $ - $ - $ - $ 414,000$ TOTAL -$ 553,000$ - $ - $ - $ - $ 553,000$ Funding Sources Proposed Total
Community Facilities
Prewett Park Easement Fencing
Insert Picture here
Project Description: This project will construct a custom wooden fence along the property line between Lone Tree Way and the East Bay Municipal Utility District. The fence will extend a distance of approximately 3,100 feet from Deer Valley Road to the commercial property east of Prewett Park.

Justification: The existing barbed wire fencing is deteriorating and needing replacement.

7952
Location: Water Treatment Plant
Project Manager: Scott Buenting
Estimated Completion: 2030
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund - $ - $ - $ - $ - $ 2,000,000$ 2,000,000$ TOTAL -$ - $ - $ - $ - $ 2,000,000$ 2,000,000$ Funding Sources Proposed Total
Water System
Parallel Raw Water Pipeline
Insert Picture here
Project Description: This project will construct a second pipeline for conveying raw water from the Municipal Reservoir to the Water Treatment Plant.

Justification: An additional pipeline will increase the reliability of the raw water conveyance system.

7954
Location: Citywide
Project Manager: Shahad Wright
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded 80,000 $ 80,000$ 80,000$ 80,000$ 80,000$ 80,000$ 480,000$ TOTAL 80,000$ 80,000$ 80,000$ 80,000$ 80,000$ 80,000$ 480,000$ Funding Sources Proposed Total
Community Facilities
Murals
Insert Picture here
Project Description: This project will restore and paint new murals throughout the City.

Justification: The beautification of the City is important to the quality of life of residents.

7957
Location: City Hall at 200 H St.

Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Development Impact Fees 173,476$ - $ - $ - $ - $ - $ 173,476$ General Fund 1,433,337$ - $ - $ - $ - $ - $ 1,433,337$ TOTAL 1,606,813$ - $ - $ - $ - $ - $ 1,606,813$ Funding Sources Proposed Total
Community Facilities
City Hall Office Modifications, Phase 2
Insert Picture here
Project Description: The project will consist of the second phase of remodeling the interior office space on the basement, first and second floor of City Hall to make it better suited for staffing needs.

Justification: The current layout of the office space is not using the space efficiently; modifications would allow for more staff working more effectively.

7967
Location: Prewett Park
Project Manager: Shahad Wright
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 General Fund 567,052 $ - $ - $ - $ - $ - $ 567,052$ Unfunded - $ 130,000$ - $ - $ - $ - $ 130,000$ TOTAL 567,052$ 130,000$ - $ - $ - $ - $ 697,052$ Funding Sources Proposed Total
Community Facilities
Prewett Park Pool Resurfacing
Insert Picture here
Project Description: This project will replace the deteriorating pool plaster on multiple pools.

Justification: Industry standard is to replaster commercial pools once every 10 years. None of the Water Park pools have been replastered in that timeframe. Aging pool plaster emits mineral dust that clogs pool filters creating future repairs for filtration systems.

Additionally, rough spots where plaster has worn out are currently showing, creating safety hazards for guests, and generally contributing to an undesirable appearance.

7969
Location: Police Department
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Development Impact Fees 73,497$ - $ - $ - $ - $ - $ 73,497$ TOTAL 73,497$ - $ - $ - $ - $ - $ 73,497$ Funding Sources Proposed Total
Community Facilities
Police Department Parking Lot Expansion
Insert Picture here
Project Description: This project will expand staff parking at the Police Department by converting the open space located in the northwest corner of the Police facility into paved parking.

Justification: Additional parking is needed to accommodate staffing at the Police Department.

7970
Location: Police Department
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Development Impact Fees 85,000$ - $ - $ - $ - $ - $ 85,000$ TOTAL 85,000$ - $ - $ - $ - $ - $ 85,000$ Funding Sources Proposed Total
Community Facilities
Police Department Investigation Unit Remodel
Insert Picture here
Project Description: This project will reconfigure the Investigations Unit area within the Police Department.

Justification: Remodeling of the area is needed to better accommodate current usage and staffing.

7971
Location: Emergency Operations Center
Project Manager: Scott Buenting
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 PEG Franchise Fee 600,000 $ - $ - $ - $ - $ - $ 600,000$ TOTAL 600,000$ - $ - $ - $ - $ - $ 600,000$ Funding Sources Proposed Total
Community Facilities
Emergency Operations Center Improvements
Insert Picture here
Project Description: This project will upgrade facilities, such as data connections, network components, laptops, projectors, and other technology required to effectively operate the City's Emergency Operations Center.

Justification: The Emergency Operations Center is a critical facility when disasters occur. The facilities required to effectively operate the Emergency Operations Center are currently aging and unreliable and need to be upgraded.

7976
Location: Citywide
Project Manager: Carlos Zepeda
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
Water Fund - $ - $ 150,000$ - $ - $ - $ 150,000$ General Fund 800,000 $ 195,000$ 175,000$ 100,000$ 100,000$ 100,000$ 1,470,000$ Unfunded - $ 100,000$ - $ 305,000$ - $ - $ 405,000$ TOTAL 800,000$ 295,000$ 325,000$ 405,000$ 100,000$ 100,000$ 2,025,000$ Funding Sources Proposed Total
Community Facilities
Facility Maintenance and Repairs
Insert Picture here
Project Description: This project consists primarily of roof repairs at several City facilities. There will be additional siding repair at the Prewett Water Park and incidental HVAC ducting repairs due to roof repairs and maintenance.

Justification: Ongoing maintenance of City owned facilities is crucial to continue providing needed services to the City's residents and to maintain the value of the City's assets.

7977
Location: Heidorn Ranch Road and Prewett Ranch Drive
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Traffic Signal Fund - $ 394,589$ - $ - $ - $ - $ 394,589$ TOTAL -$ 394,589$ - $ - $ - $ - $ 394,589$ Funding Sources Proposed Total
Traffic Signals
Traffic Signal: Heidorn Ranch Road/Prewett Ranch Drive
Insert Picture here
Project Description: This project will install a new traffic signal and related facilities at the intersection of Heidorn Ranch Road and Prewett Ranch Drive.

Justification: This is a developer funded facility constructed for future traffic needs.

7978
Location: Water Treatment Plant
Project Manager: Scott Buenting
Estimated Completion: 2028
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund - $ - $ 1,500,000$ - $ - $ - $ 1,500,000$ TOTAL -$ - $ 1,500,000$ - $ - $ - $ 1,500,000$ Funding Sources Proposed Total
Water System
Water Treatment Plant HVAC Systems
Insert Picture here
Project Description: This project will replace various HVAC systems within the Water Treatment Plant.

Justification: The systems are aging and unreliable and need to be replaced.

7979
Location: Water Treatment Plant
Project Manager: Marcus Woodland
Estimated Completion: 2031
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund - $ - $ - $ - $ - $ 500,000$ 500,000$ TOTAL -$ - $ - $ - $ - $ 500,000$ 500,000$ Funding Sources Proposed Total
Water System
Water Treatment Plant B Flash Mixers
Insert Picture here
Project Description: This project will conduct maintenance and repairs on the flash mixers at Plant B at the Water Treatment Plant.

Justification: The system has met its useful life and needs to be replaced.

7980
Location: Water Treatment Plant
Project Manager: Marcus Woodland
Estimated Completion: 2030
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund - $ - $ - $ - $ 500,000$ - $ 500,000$ TOTAL -$ - $ - $ - $ 500,000$ - $ 500,000$ Funding Sources Proposed Total
Water System
Water Treatment Plant B Solar Covers
Insert Picture here
Project Description: This project will replace the solar covers at Plant B at the Water Treatment Plant.

Justification: The covers help regulate temperature within the basins. The existing covers are deteriorating and need to be replaced.

7981
Location: Water Treatment Plant
Project Manager: Marcus Woodland
Estimated Completion: 2029
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund - $ 500,000$ - $ 500,000$ - $ 500,000$ 1,500,000$ TOTAL -$ 500,000$ - $ 500,000$ - $ 500,000$ 1,500,000$ Funding Sources Proposed Total
Water System
Water Treatment Plant B Improvements
Insert Picture here
Project Description: This project will replace deteriorating equipment, repair aging and damaged facilities, upgrade controls and install new facilities.

Justification: Upgrades to the facility are required to maintain and improve the efficiency of the plant.

7983
Location: Various Trails Citywide
Project Manager: Carlos Zepeda
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Gas Tax 234,630 $ 175,000$ 175,000$ 175,000$ 175,000$ 175,000$ 1,109,630$ TOTAL 234,630$ 175,000$ 175,000$ 175,000$ 175,000$ 175,000$ 1,109,630$ Funding Sources Proposed Total
Parks & Trails
Trail Maintenance Program
Insert Picture here
Project Description: This program will install asphalt concrete overlays on existing paved trails to preserve the integrity of the pathways.

The work is scheduled to be performed on Mokelumne Trail, Deerfield Corridor, Almondridge Trail, Lexington Pathway, Bellflower Trail, and Mesa Ridge Trail from Deer Valley to Grass Valley and Mokelumne Dr. to Deer Valley Road.

Justification: Maintenance of the City's trail system provides safe access through the City's open spaces.

7984
Location: Community Park
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded - $ 2,200,000$ - $ - $ - $ - $ 2,200,000$ TOTAL -$ 2,200,000$ - $ - $ - $ - $ 2,200,000$ Funding Sources Proposed Total
Parks & Trails
Community Park Synthetic Turf Replacement
Insert Picture here
Project Description: This project will rehabilitate the base material and replace the synthetic turf at the Community Park soccer fields.

Justification: The synthetic turf fields have reached their useful life.

7989
Location: All City Facilities
Project Manager: Carlos Zepeda
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
Water Fund 195,000 $ - $ - $ - $ - $ - $ 195,000$ Recreation 20,000 $ - $ - $ - $ - $ - $ 20,000$ TOTAL 215,000$ - $ - $ - $ - $ - $ 215,000$ Funding Sources Proposed Total
Community Facilities
Integration and Upgrade of Access Control, Surveillance, Monitoring, and Fire Alarm
Insert Picture here
Project Description: This project will include installation of new security access, monitoring and surveillance hardware at all City facilities. Cameras, intrusion, and security access will be added at facilities which currently do not have security monitoring. Existing facilities with security will be upgraded as well to bring all the City's building under one security monitoring systems provider.

Justification: The City seeks to always maintain the security of its employees and infrastructure. Upgrading and adding security and fire monitoring capabilities throughout the City's facilities achieves this goal.

7990
Location: 75 Walton Lane
Project Manager: Scott Buenting
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 General Fund 165,051 $ - $ - $ - $ - $ - $ 165,051$ TOTAL 165,051$ - $ - $ - $ - $ - $ 165,051$ Funding Sources Proposed Total
Community Facilities
Installation of Police Department Radio Simulcast Tower Insert Picture here
Project Description: This project will install a simulcast tower at 75 Walton Lane that will provide additional radio coverage in the southwest part of the City.

Justification: Currently, there is a large "dead" radio coverage area in the southwest part of the city. This creates a significant safety issue for our employees, as well as the public. Installation of the radio simulcast tower will improve response to calls in this area.

7991
Location: Nick Rodriguez Community Center/Antioch Senior Center Project Manager: Shahad Wright
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 State Grant - CNRA 2,162,059$ - $ - $ - $ - $ - $ 2,162,059$ General Fund 259,000 $ - $ - $ - $ - $ - $ 259,000$ TOTAL 2,421,059$ - $ - $ - $ - $ - $ 2,421,059$ Funding Sources Proposed Total
Community Facilities
Nick Rodriguez Community Center Rehab
Insert Picture here
Project Description: This project will remodel, upgrade ADA accessibility and technology, and replace the roof at the Nick Rodriguez Community Center and Antioch Senior Center.

Justification: Currently, the facility is not ADA compliant, existing amenities have reached the end of service life, and hazardous material mitigation will be necessary during construction. Upgrades are needed to provide high quality recreation programs and services to the residents in downtown/northern Antioch.

7992
Location: Citywide
Project Manager: Shaun Connelly
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund 1,875,874$ 1,500,000$ - $ - $ - $ - $ 3,375,874$ TOTAL 1,875,874$ 1,500,000$ - $ - $ - $ - $ 3,375,874$ Funding Sources Proposed Total
Water System
AMI Water Meter Reading Upgrade
Insert Picture here
Project Description: This project will replace the existing drive-by Automatic Meter Reading system with Advanced Metering Infrastructure (AMI) which provides real-time water meter reading. This project requires a full retrofit of all existing water meter and meter box lids to allow water meter readings to communicate through a cellular network.

Justification: The cellular water meter upgrade will provide real-time meter readings to residents online. City staff will have access to reliable water meter readings and effectively address customer service concerns. Water conservation is a priority to the City and this system upgrade enables the City to continue improving its conservation efforts.

7993
Location: East Antioch Creek
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
Sewer System Improvement Fund 1,000,000$ - $ - $ - $ - $ - $ 1,000,000$ TOTAL 1,000,000$ - $ - $ - $ - $ - $ 1,000,000$ Funding Sources Proposed Total
Wastewater & Storm Drain System
East Antioch Creek Outfall Improvements
Insert Picture here
Project Description: This project will replace the East Antioch Creek outfall near the intersection of Fulton Shipyard Road and McElhaney Road. The work will include replacement of two sections of storm drainpipe with associated flapper gates and reconstructing a deteriorating sanitary sewer pipeline that crosses the outfall piping.

Justification: The storm drains and sewer pipelines are deteriorating and causing tidal water to erode soil on the outside of the pipes.

These lines affect soil stability under an access road.

7997
Location: Water Treatment Plant
Project Manager: Marcus Woodland
Estimated Completion: 2029
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund - $ - $ - $ 500,000$ - $ - $ 500,000$ TOTAL -$ - $ - $ 500,000$ - $ - $ 500,000$ Funding Sources Proposed Total
Water System
Water Treatment Plant Variable Frequency Drives
Insert Picture here
Project Description: This project will add variable frequency drives to the City's existing treated water distribution system with the Water Treatment Plant.

Justification: The system will allow operators to slowly ramp up and control the flow of water leaving the treatment plant into the distribution system. The current motors do not allow any modification and are off or on, which is not ideal to maintain pressure and manage the system efficiently. Variable frequency drives will lessen the likelihood of main breaks from turning on and off pumps at the plant and provide a more consistent method of operation.

8002
Location: Water Treatment Plant
Project Manager: Scott Buenting
Estimated Completion: 2028
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund - $ - $ 900,000$ - $ - $ - $ 900,000$ TOTAL -$ - $ 900,000$ - $ - $ - $ 900,000$ Funding Sources Proposed Total
Water System
Water Treatment Plant Generator Replacement
Insert Picture here
Project Description: This project will replace the existing water treatment plant generators.

Justification: The current generators are nearing the end of their useful service life and need to be replaced to maintain future operations reliability in the event of a power failure.

8003
Location: Canal Pump on Lone Tree Way
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund - $ 300,000$ - $ - $ - $ - $ 300,000$ TOTAL -$ 300,000$ - $ - $ - $ - $ 300,000$ Funding Sources Proposed Total
Water System
Canal Pump Variable Frequency Drives
Insert Picture here
Project Description: This project will install variable frequency drives at the canal pumps.

Justification: The variable frequency drive motors will increase the lifespan of existing pumps and allow operations to fill and drain the Antioch Municipal Reservoir more responsibly and efficiently. This addition will lessen the impact on the reservoirs earthen dam.

8004
Location: Lone Tree Way Booster Pump Station
Project Manager: Scott Buenting
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund 1,100,000 $ - $ - $ - $ - $ - $ 1,100,000$ TOTAL 1,100,000$ - $ - $ - $ - $ - $ 1,100,000$ Funding Sources Proposed Total
Water System
Lone Tree Way Booster Pump Improvements
Insert Picture here
Project Description: This project will replace outdated generator, electrical panels, pumps, motors, control valves and install a new flow meter at the Lone Tree Way Booster Pump Station.

Justification: The facility is aging and requires improvements for reliability and efficiency.

8006
Location: 800 W 2nd Street
Project Manager: Carlos Zepeda
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 ARPA 780,000 $ - $ - $ - $ - $ - $ 780,000$ Capital Improvement Fund 200,000$ - $ - $ - $ - $ - $ 200,000$ Development Impact Fees 900,000$ - $ - $ - $ - $ - $ 900,000$ TOTAL 1,880,000$ - $ - $ - $ - $ - $ 1,880,000$ Funding Sources Proposed Total
Community Facilities
Finance & Human Resources Department Facility
Insert Picture here
Project Description: This project will evaluate locations for housing the Finance and Human Resources Departments. This includes the purchase of a new facility and modifying existing facilities as needed to accommodate the new department.

Justification: These departments currently do not have space suitable for staffing needs.

8007
Location: Prewett Community Park
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 SS4A Grant 4,000,000 $ - $ - $ - $ - $ - $ 4,000,000$ Development Impact Fees 895,303$ - $ - $ - $ - $ - $ 895,303$ TOTAL 4,895,303$ - $ - $ - $ - $ - $ 4,895,303$ Funding Sources Proposed Total
Parks & Trails
Bicycle Garden Construction
Insert Picture here
Project Description: The Bicycle Garden will be a hands-on bicycle training facility and designed like a miniature city streetscape. The park would consist of small roads that weave in and around landscaped areas with smaller scaled versions of real-life traffic features including signals, traffic signs, road markings, bus stops, bike lanes, train tracks, and more to help youth learn the rules-of-the-road.

Justification: To improve amenities to the residents of Antioch.

8009
Location: Various schools throughout the City
Project Manager: Scott Buenting
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Gas Tax 100,000 $ 50,000$ 50,000$ 50,000$ 50,000$ 50,000$ 350,000$ TDA Grant - $ 100,000$ - $ - $ - $ - $ 100,000$ Unfunded 50,000 $ 50,000$ 50,000$ 50,000$ 50,000$ 50,000$ 300,000$ TOTAL 150,000$ 200,000$ 100,000$ 100,000$ 100,000$ 100,000$ 750,000$ Funding Sources Proposed Total
Roadway Improvements
Antioch School Pedestrian Safety Improvements
Insert Picture here
Project Description: The project will install bicycle and pedestrian safety improvements near Antioch schools. Work may include items such as curb cuts, rectangular rapid flashing beacons, a speed radar, pedestrian warning devices, and updated school crossings and legends.

Justification: The project will improve access and safety within the City.

8011
Location: Prewett Water Park
Project Manager: Shahad Wright
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 General Fund 16,381 $ - $ - $ - $ - $ - $ 16,381$ Unfunded 1,155,000 $ - $ - $ - $ - $ - $ 1,155,000$ TOTAL 1,171,381$ - $ - $ - $ - $ - $ 1,171,381$ Funding Sources Proposed Total
Community Facilities
Prewett Park Buildings Renovation
Insert Picture here
Project Description: This project will rehabilitate both buildings at the Antioch Water Park, which will include roof and siding of the rear building, new flooring and paint, renovated locker rooms, restrooms and staff areas.

Justification: The Water Park has operated for 27 years without a major renovation. Most of the fixtures have reached the end of useful life. Both buildings are in need of rehabilitation.

8012
Location: Prewett Water Park
Project Manager: Scott Buenting
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 General Fund 629,965 $ - $ - $ - $ - $ - $ 629,965$ TOTAL 629,965$ - $ - $ - $ - $ - $ 629,965$ Funding Sources Proposed Total
Community Facilities
Prewett Park Concrete Improvements, Phase 4
Insert Picture here
Project Description: This project will rehabilitate portions of the existing concrete deck and pool coping.

Justification: The deck presents a safety issue in many areas. It is worn, cracked, and rough and will result in patron injury if not addressed soon.

8013
Location: Prewett Water Park
Project Manager: Shahad Wright
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 General Fund 50,000 $ - $ - $ - $ - $ - $ 50,000$ TOTAL 50,000$ - $ - $ - $ - $ - $ 50,000$ Funding Sources Proposed Total
Community Facilities
Prewett Park Mechanical and Structural Evaluation
Insert Picture here
Project Description: This project will evaluate Antioch Water Park's aging equipment and structures to determine the best course of action for rehabilitation. The Sport Pool is one example which has settled and is no longer level and other equipment has reached its useful life.

Justification: The structures needing repair will eventually become inoperable if not addressed.

8014
Location: Various Trail Crossings
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 HSIP Grant 828,000 $ - $ - $ - $ - $ - $ 828,000$ Traffic Signal Fund 89,336 $ - $ - $ - $ - $ - $ 89,336$ TOTAL 917,336$ - $ - $ - $ - $ - $ 917,336$ Funding Sources Proposed Total
Traffic Signals
Trail Crossing Improvements
Insert Picture here - Update Photo
Project Description: This project will install Hawk signals at trail crossings to enhance pedestrian and bicycle safety.

Justification: Installation of Pedestrian Hybrid Beacon (HAWK Signal) at the trail crossings has a potential to greatly enhance pedestrians' safety at locations that are noted as being problematic in the past.

8015
Location: Various Locations
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 HSIP Grant 2,521,000 $ - $ - $ - $ - $ - $ 2,521,000$ Traffic Signal Fund 274,146 $ - $ - $ - $ - $ - $ 274,146$ TOTAL 2,795,146$ - $ - $ - $ - $ - $ 2,795,146$ Funding Sources Proposed Total
Traffic Signals
Signal System Upgrade at Various Locations
Insert Picture here
Project Description: This project will improve signal hardware including lenses, backplates with retroflective borders, mounting, size, and number. This will also install pedestrian countdown signal heads and install an advance stop bar before cross walk.

Justification: Enhancing the signal hardware will provide better visibility of intersection signals and aid the drivers in advance perception of the upcoming intersection. Installation of pedestrian countdown signal heads will enhance pedestrian safety and result in reduction of collisions between pedestrians and vehicles. Installation of an advance stop bar before crosswalk will enhance pedestrian and bicycle safety by providing a buffer between the vehicles and pedestrians and bicycles.

8017
Location: 4040 Lone Tree Way
Project Manager: Marcus Woodland
Estimated Completion: 2028
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund 550,000 $ - $ 700,000$ - $ - $ - $ 1,250,000$ TOTAL 550,000$ - $ 700,000$ - $ - $ - $ 1,250,000$ Funding Sources Proposed Total
Water System
Reservoir Road Rehabilitation
Insert Picture here
Project Description: This project will reinforce and repair the access road for the Antioch Municipal Reservoir.

Justification: The road to the dam is eroding and is hazardous to drive when wet.

8019
Location: Prewett Water Park
Project Manager: Shahad Wright
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded - $ 364,000$ - $ - $ - $ - $ 364,000$ TOTAL -$ 364,000$ - $ - $ - $ - $ 364,000$ Funding Sources Proposed Total
Community Facilities
Prewett Water Park Prewett Peak Structure Remediation
Insert Picture here
Project Description: Repair and replace corroded steel structure inside Prewett Peak, which supports the park's two tallest slides.

Justification: Continued operation of the City's only Aquatic Facility.

8020
Location: Prewett Water Park
Project Manager: Shahad Wright
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 General Fund 132,922 $ - $ - $ - $ - $ - $ 132,922$ TOTAL 132,922$ - $ - $ - $ - $ - $ 132,922$ Funding Sources Proposed Total
Community Facilities
Prewett Water Park Mechanical Improvements
Insert Picture here
Project Description: Replace various water pumps, heaters, and other mechanical items at the Water Park.

Justification: Continued operation of the City's only Aquatic Facility.

8021
Location: Antioch Community Center
Project Manager: Shahad Wright
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded 50,000 $ - $ - $ - $ - $ - $ 50,000$ TOTAL 50,000$ - $ - $ - $ - $ - $ 50,000$ Funding Sources Proposed Total
Community Facilities
Antioch Community Center Interior Painting
Insert Picture here
Project Description: Repaint interior of facility where there is currently a vinyl wrap that is breaking down.

Justification: Beautification of public facilities.

8022
Location: 300 L Street
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded 1,300,000 $ 300,000 $ - $ - $ - $ - $ 1,600,000$ TOTAL 1,300,000$ 300,000 $ - $ - $ - $ - $ 1,600,000$ Funding Sources Proposed Total
Community Facilities
Dispatch Communications Center Improvements
Insert Picture here
Project Description: Update communication center with additional space and seismic retrofits.

Justification: As staffing increases there will be a need for additional spaces and the building needs updates.

8023
Location: 300 L Street
Project Manager: Scott Buenting
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Development Impact Fees 300,000$ - $ - $ - $ - $ - $ 300,000$ TOTAL 300,000$ - $ - $ - $ - $ - $ 300,000$ Funding Sources Proposed Total
Community Facilities
Property and Evidence Storage Building
Insert Picture here
Project Description: The Police Department is in need of a new property and evidence building to safely and securely house old and new evidence and dramatically cut the cost for on and off site evidence storage.

Justification: The Police Department is spending approximately $50,000 per year for on and off site storage of evidence. By constructing this building, the PD will have paid for the cost of the building in a little more than 2 years and dramatically reduce annual expenses .

8024
Location: 300 L Street
Project Manager: Scott Buenting
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded 70,000 $ - $ - $ - $ - $ - $ 70,000$ TOTAL 70,000$ - $ - $ - $ - $ - $ 70,000$ Funding Sources Proposed Total
Community Facilities
Police Department Records Area Remodel
Insert Picture here
Project Description: Records Division remodel. Arrange space in the Records Division with office equipment and work spaces to accommodate current staffing needs.

Justification: There are currently not enough desks in one room to house all records employees and staff continues to increase.

8025
Location: Various City Properties
Project Manager: Scott Buenting
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund 112,000 $ - $ - $ - $ - $ - $ 112,000$ Delta Fair Fund 56,000 $ - $ - $ - $ - $ - $ 56,000$ TOTAL 168,000$ - $ - $ - $ - $ - $ 168,000$ Funding Sources Proposed Total
Community Facilities
Security Fencing at City Facilities
Insert Picture here
Project Description: This project will install security fencing at various locations throughout the City.

Justification: The City maintains numerous properties and facilities. Additional fencing is necessary to better secure the sites.

8027
Location: 200 H Street
Project Manager: Scott Buenting
Estimated Completion: 2028
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded - $ - $ - $ 50,000$ - $ - $ 50,000$ TOTAL -$ - $ - $ 50,000$ - $ - $ 50,000$ Funding Sources Proposed Total
Community Facilities
Window Security at City Hall
Insert Picture here
Project Description: This project will install some type of device or mechanism to the windows to eliminate a break-in.

Justification: Adding security to City Hall windows will prevent break-ins and help secure the facility.

8028
Location: Various City Facilities
Project Manager: Carlos Zepeda
Estimated Completion: 2028
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded - $ 250,000$ - $ 250,000$ - $ - $ 500,000$ TOTAL -$ 250,000$ - $ 250,000$ - $ - $ 500,000$ Funding Sources Proposed Total
Community Facilities
Citywide Key Upgrades
Insert Picture here
Project Description: This project consists of replacing all keyed door locks inside and out for all City owned facilities.

Justification: The primary reason for the key upgrades is to provide better security to the facilities. Secondly, many key cores are old and worn out and in need of replacement.

8029
Location: Various Locations throughout the City
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Gas Tax 50,000 $ - $ - $ - $ - $ - $ 50,000$ Measure J 65,363 $ - $ - $ - $ - $ - $ 65,363$ OBAG3 2,514,000 $ - $ - $ - $ - $ - $ 2,514,000$ TOTAL 2,629,363$ - $ - $ - $ - $ - $ 2,629,363$ Funding Sources Proposed Total
Traffic Signals
Countywide Smart Signals
Project Description: The Project will install a signal system and Intelligent Transportation System (ITS) equipment upgrades to key identified intersections within Contra Costa County cities with the objective to coordinate and synchronize the timing of the signals.

Justification: The existing traffic signal systems are outdated or antiquated compared to newer traffic signal systems. These signal systems currently lack communication infrastructure such as fiber and cellular/wireless-based communication, which makes it difficult to implement traffic signal synchronization and coordination between traffic signals along an arterial.

8030
Location: Various parks, rights-of-way and medians throughout the City Project Manager: Carlos Zepeda
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded 200,000 $ 200,000$ 200,000$ 200,000$ 200,000$ 200,000$ 1,200,000$ TOTAL 200,000$ 200,000$ 200,000$ 200,000$ 200,000$ 200,000$ 1,200,000$ Funding Sources Proposed Total
Project Description: This project will replace the aging irrigation controllers.

Community Facilities
Irrigation Controller Upgrades
Insert Picture here
Justification: The current model of the existing irrigation controllers is being phased out of production and will no longer be available in a few years. The aging irrigation controllers will need to be replaced with the new model in order to be compatible with the current irrigation systems.

8031
Project Manager: Carlos Zepeda
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded 1,000,000 $ 1,000,000$ 1,000,000$ 1,000,000$ 1,000,000$ 1,000,000$ 6,000,000$ TOTAL 1,000,000$ 1,000,000$ 1,000,000$ 1,000,000$ 1,000,000$ 1,000,000$ 6,000,000$ Funding Sources Proposed Total
Parks & Trails
Playground Replacement Program
Insert Picture here
Project Description: This project will replace seven playgrounds identified as high safety risks based on the citywide park assessments conducted by Miracle PlaySystems in March 2025.

Location: Harbour, Mountaire, Antioch Community, Williamson Ranch, Chapparal, and Meadow Creek Parks
Justification: This project will meet the Consumer Product Safety Commission (CPCS) and the American Society for Testing and Materials (ASTM) standards for playground systems and eliminate the existing safety risks with the existing playground.

8032
Location: Antioch Marina at the foot of L Street
Project Manager: Carlos Zepeda
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded - $ 200,000$ - $ - $ - $ - $ 200,000$ TOTAL -$ 200,000$ - $ - $ - $ - $ 200,000$ Funding Sources Proposed Total
Justification: Pedestals are showing signs of age, metal pieces are rusting, plastic covers have become brittle, and water supplies are rotting out.

Community Facilities
Marina Pedestals Replacement
Project Description: This project will replace the pedestals located at the Marina that supply shore power to customer boats. The pedestal meters are having electrical issues on a regular basis and require costly repairs by an electrical contractor.

8033
Location: Antioch Marina at the foot of L Street
Project Manager: Carlos Zepeda
Estimated Completion: Ongoing Program
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded 150,000 $ 150,000$ 150,000$ 150,000$ 150,000$ 150,000$ 900,000$ TOTAL 150,000$ 150,000$ 150,000$ 150,000$ 150,000$ 150,000$ 900,000$ Funding Sources Proposed Total
Justification: Various parts of the docks, floats and slips at the Marina are aging and in need of repair posing safety hazards.

Community Facilities
Marina Upgrades
Project Description: This project will replace the docks, floats, and slips at the Marina. Assessments of dock conditions and dive survey to assess the floats will need to be conducted and corner board of slips should be replaced with newer Ultra High Molecular Weight Polyethylene plastic boards.

8034
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Gas Tax 865,000 $ - $ - $ - $ - $ - $ 865,000$ TOTAL 865,000$ - $ - $ - $ - $ - $ 865,000$ Funding Sources Proposed Total
Justification: Excessive speed on residential roadways is a safety concern. This project strives to reduce the risks of traffic accidents throughout the City.

Roadway Improvements
James Donlon Traffic Calming
Project Description: This project will implement traffic calming strategies that have been identified by residents, City Council and confirmed by the City Engineer.

Location: James Donlon Boulevard from Somersville Road to Lone Tree Way

8035
Location: Sycamore Drive
Project Manager: Scott Buenting
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Gas Tax 425,000 $ - $ - $ - $ - $ - $ 425,000$ TOTAL 425,000$ - $ - $ - $ - $ - $ 425,000$ Funding Sources Proposed Total
Roadway Improvements
Sycamore Traffic Calming
Project Description: This project will implement traffic calming strategies that have been identified by residents, City Council and confirmed by the City Engineer.

Justification: Excessive speed on residential roadways is a safety concern. This project strives to reduce the risks of traffic accidents throughout the City.

8036
Location: West Tenth Street, from A Street to L Street Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Gas Tax 220,000 $ - $ - $ - $ - $ - $ 220,000$ TOTAL 220,000$ - $ - $ - $ - $ - $ 220,000$ Funding Sources Proposed Total
Roadway Improvements
West Tenth Street Traffic Calming
Insert Picture here
Project Description: This project will implement traffic calming strategies that have been identified by residents, City Council and confirmed by the City Engineer.

Justification: Excessive speed on residential roadways is a safety concern. This project strives to reduce the risks of traffic accidents throughout the City.

8038
Location: Citywide
Project Manager: Scott Buenting
Estimated Completion: 2026
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Sewer Fund 700,000 $ - $ - $ - $ - $ - $ 700,000$ TOTAL 700,000$ - $ - $ - $ - $ - $ 700,000$ Funding Sources Proposed Total
Wastewater & Storm Drain System
Sewer System Master Plan Update
Insert Picture here
Project Description: This project will update the Sewer System Master Plan to protect public health, reduce overflows, and ensure future growth.

Justification: The Sewer System Master Plan needs to be updated every 5 to 6 years to comply with state regulations.

8039
Location: 300 L Street
Project Manager: Lt. Mellone
Estimated Completion: 2030
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded - $ 1,000,000$ 1,000,000$ 1,000,000$ 1,000,000$ - $ 4,000,000$ TOTAL -$ 1,000,000$ 1,000,000$ 1,000,000$ 1,000,000$ - $ 4,000,000$ Funding Sources Proposed Total
Community Facilities
PD Dispatch / Real-Time Crime Center
Insert Picture here
Project Description: This project is proposing the relocation and modernization of the Dispatch Center and to establish a Real-Time Crime Center (RTCC).

Justification: The current facility is outdated and unable to support modern communications technology. Integrating an RTCC with the updated Dispatch Center will improve connectivity, response, and technology in public safety.

8040
Location: Donlon Booster Pump Station
Project Manager: Marcus Woodland
Estimated Completion: 2028
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Water Fund - $ - $ - $ 2,500,000$ - $ - $ 2,500,000$ TOTAL -$ - $ - $ 2,500,000$ - $ - $ 2,500,000$ Funding Sources Proposed Total
Water System
Removal of Underground Storage Tank
Insert Picture here
Project Description: Removal of the Underground Storage Tank will be at the Donlon Booster Pump Station and will be replaced with an Above Ground Storage Tank.

Justification: Diesel storage tanks are needed at the booster pump station to support emergency water delivery, but the current underground tank is aging, costly to maintain, and heavily regulated.

8041
Location: 4703 Lone Tree Way
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded - $ 540,000$ - $ - $ - $ - $ 540,000$ TOTAL -$ 540,000$ - $ - $ - $ - $ 540,000$ Funding Sources Proposed Total
Community Facilities
Antioch Community Center Roof Improvements
Insert Picture here
Project Description: Replacement of the roof at the Antioch Community Center.

Justification: Based on a recent roof assessment, a flat roof is recommended for replacement due to cracks and aging.

8042
Location: 200 H Street
Project Manager: Scott Buenting
Estimated Completion: 2028
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded - $ - $ 345,000$ - $ - $ - $ 345,000$ TOTAL -$ - $ 345,000$ - $ - $ - $ 345,000$ Funding Sources Proposed Total
Community Facilities
City Hall Roof Improvements
Insert Picture here
Project Description: This project will restore and replace portions of the City Hall roof.

Justification: Based on a recent roof assessment, a flat roof is recommended for restoration and maintenance due to the aging roof.

8043
Location: 300 L Street
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded - $ 1,350,000$ - $ - $ - $ - $ 1,350,000$ TOTAL -$ 1,350,000$ - $ - $ - $ - $ 1,350,000$ Funding Sources Proposed Total
Community Facilities
Antioch Police Department Roof Improvements
Insert Picture here
Project Description: Replacement of the roof and gutters at the Antioch Police Department.

Justification: Based on a recent roof and Weather Weld Systems' assessment, a tar and gravel roof is recommended for replacement due to aging.

8044
Location: 1201 W 4th Street
Project Manager: Scott Buenting
Estimated Completion: 2028
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded - $ - $ 490,000$ - $ - $ - $ 490,000$ TOTAL -$ - $ 490,000$ - $ - $ - $ 490,000$ Funding Sources Proposed Total
Community Facilities
Public Works Roof Improvements
Insert Picture here
Project Description: This project will repair and upgrade the Water Distribution office/shop, including drain areas, equipment spaces, and roof sealing, and replace roofs at the main vehicle shop, satellite shop, and streets equipment storage facilities.

Justification: Based on a recent roof assessment, the roofs at several Public Works facilities are recommended for restore/replacement due to the aging of roofs and increase of maintenance costs.

8045
Location: Slatten Ranch Road from Wicklow Way to Wild Horse Road Project Manager: Scott Buenting
Estimated Completion: 2031
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 East LT Spec Plan Ben District -$ - $ 2,800,000$ 6,000,000$ 2,500,000$ - $ 11,300,000$ ECCRFFA - $ - $ 1,200,000$ 4,000,000$ 3,500,000$ - $ 8,700,000$ Unfunded - $ - $ - $ - $ 6,000,000$ 8,000,000$ 14,000,000$ TOTAL -$ - $ 4,000,000$ 10,000,000$ 12,000,000$ 8,000,000$ 34,000,000$ Funding Sources Proposed Total
Roadway Improvements
Slatten Ranch Road, Phase I
Insert Picture here
Project Description: This project consists of planning, designing and construction of a four-lane Slatten Ranch Road segment with sidewalks, bike lanes, lighting, drainage, traffic features, and a new canal bridge.

Justification: Construction of this roadway will improve traffic flow and support development.

8046
Location: 519 F Street
Project Manager: Scott Buenting
Estimated Completion: 2027
Current
FY 25/26 FY 26/27 FY 27/28 FY 28/29 FY 29/30 FY 30/31
1 Unfunded 200,000 $ - $ - $ - $ - $ - $ 200,000$ TOTAL 200,000$ - $ - $ - $ - $ - $ 200,000$ Funding Sources Proposed Total
Community Facilities
Carnegie Library Renovation
Insert Picture here
Project Description: This project will provide access improvements, sub-floor and floor repairs, ADA bathroom remodel, repairs to the exterior stucco and interior refinishing.

Justification: Upgrades to the existing facility will be utilized by City staff and/or residents.

10 Agenda Item #

STAFF REPORT TO THE CITY COUNCIL

DATE: Regular Meeting of June 9, 2026

TO: Honorable Mayor and Members of the City Council

SUBMITTED BY: Desmond Bittner, Captain

APPROVED BY: Joe Vigil, Chief of Police

SUBJECT: Resolution Adopting the City's Local Hazard Mitigation Plan (LHMP)

RECOMMENDED ACTION
It is recommended that the City Council adopt a resolution approving the City’s Local Hazard Mitigation Plan.

FISCAL IMPACT
There is no additional fiscal impact. The cost associated with preparing the City’s Local Hazard Mitigation Plan was included in the FY 2025/26 Police Department General Fund budget.

DISCUSSION
The Federal Disaster Act of 2000 requires local governments to adopt a comprehensive Hazard Mitigation Plan (HMP) to receive full federal funding after a disaster. By law, a Hazard Mitigation Plan must describe the type, location, and extent of all natural hazards that can affect a jurisdiction; describe the jurisdiction’s vulnerability to these hazards; include a mitigation strategy that provides the jurisdiction’s blueprint for reducing the potential losses; and contain a plan maintenance process. The Disaster Mitigation Act of 2000 strongly encourages state
and local authorities to work together
on pre- disaster planning, and it promotes “sustainable hazard mitigation”, which includes sound management of natural resources, local economic and social resiliency, and the recognition that hazards and mitigation must be understood in the largest possible social and economic context. The Disaster Mitigation Act of 2000 called for an enhanced planning network to help local governments accurately assess mitigation needs, enabling faster allocation of funding for disaster assistance and cost -effective risk-reduction projects.

State Assembly Bill (AB) 2140, which became effective on January 1, 2007, places limits on the amount of additional state funding to local jurisdictions for certain disaster recovery projects funded by the California Disaster Assistance Act (CDAA). Under AB 2140, unless the local jurisdiction has an approved Hazard Mitigation Plan and has Antioch City Council Report
June 9, 2026 Agenda Item #10 2

incorporated that Hazard Mitigation Plan into the jurisdiction’s General Plan Safety Element, it might not be eligible to obtain additional funding from the state for certain disaster recovery projects. Although compliance with AB 2140 is optional, noncompliance limits the City's ability to obtain additional disaster assistance and recovery funding from the state.

On July 1, 2024, a request for proposals w as solicited on the City’s website for Hazard Mitigation Plan Preparation consulting services. On August 1, 2024, seven (7) proposals were received. Staff reviewed and scored the proposals and determined that Navigating Preparedness Associates met the City's needs
. On September 10, 2024, Council
approved the award to Navigating Preparedness Associates for the preparation of the City’s Local Hazard Mitigation Plan. The Local Hazard Mitigation plan was prepared and submitted to the California Office of Emergency Services on February 17, 2026 . It was later approved by the California Office of Emergency Services and the Federal Emergency Management Agency (FEMA) on May 1, 2026.

Adoption of this plan demonstrates the City’s continued commitment to hazard mitigation and resilience. The LHMP will guide future mitigation actions, support eligibility for federal mitigation funding programs, and enhance our ability to protect the health, safety, and welfare of our residents. FEMA requires Local Hazard Mitigation Plans to be updated every five years.

Listed below are links to the City of Antioch’s Emergency Operation Plan, the Contra Costa Water District Dam Safety Program, and Emergency Planning and Preparation Resources for local Hospitals.

Antioch-Emergency-Operations-Plan-2021-PDF
https://www.antiochca.gov/478/Disaster-Preparedness#docaccess- 0fd3a7f60f354083adc228f73c62814c34ada3c46e3a9f1f8c84935a2a60719f Dam Safety Program | Contra Costa Water District, CA
https://www.ccwater.com/1051/Dam-Safety-Program
Hospital Disaster Preparedness - California Hospital Association https://calhospital.org/calhospitalprepare/

ATTACHMENTS
A. Resolution
Exhibit A to Resolution - Local Hazard Mitigation Plan
B. FEMA Approval Letter

Antioch City Council Report
June 9, 2026 Agenda Item #10 3

ATTACHMENT A

RESOLUTION NO. 2026/**

RESOLUTION OF THE CITY COUNCIL OF THE CITY OF ANTIOCH

ADOPTING THE CITY OF ANTIOCH LOCAL HAZARD MITIGATION PLAN

WHEREAS, the City of Antioch recognizes the threat that natural hazards pose to people and property within the City of Antioch; and

WHEREAS, the City of Antioch has prepared a local hazard mitigation plan, hereby known as the City of Antioch Local Hazard Mitigation Plan, May 2026, in accordance with federal laws, including the Robert T. Stafford Disaster Relief and Emergency Assistance Act, as amended; the National Flood Insurance Act of 1968, as amended; and the National Dam Safety Program Act, as amended; and

WHEREAS, the City of Antioch Local Hazard Mitigation Plan, May 2026, identifies mitigation goals and actions to reduce or eliminate long-term risk to people and property in the City of Antioch from the impacts of future hazards and disasters; and

WHEREAS, adoption by the City Council demonstrates its commitment to hazard mitigation and achieving the goals outlined in the City of Antioch Local Hazard Mitigation Plan, May 2026.

WHEREAS, the City Council has considered adoption of the City of Antioch Local Hazard Mitigation Plan, May 2026, as approved by the California Office of Emergency Services and Federal Emergency Management Agency on May 1, 2026;

NOW, THEREFORE, BE IT RESOLVED that the City Council of the City of Antioch hereby adopts the City of Antioch Local Hazard Mitigation Plan, May 2026, incorporated by reference as Exhibit A.

* * * * * * *

I HEREBY CERTIFY that the foregoing resolution was passed and adopted by the City Council of the City of Antioch, at a regular meeting thereof, held on the 26th day of May 2026, by the following vote:

AYES:

NOES:

ABSTAIN:

ABSENT:

_________________________________________
MICHAEL J. MANDY

CITY CLERK OF THE CITY OF ANTIOCH
CITY OF AN TIOC H 2025 LOC AL HAZ AR D M ITIGATION PLAN _______________________________________________________________________ _____________

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 2 –

THIS PAGE INTENTIONALLY LEFT BLANK

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 3 –

RECORD OF REVIEWS AND REVISIONS
Revision # Date Revisions Made Entered By

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 4 –

THIS PAGE INTENTIONALLY LEFT BLANK

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 5 –

PLAN DISTRIBUTION
Date Plan
Version
Method of Distribution
(Email, Post on Server,
Provide Hard Copy, etc.)
Distributed To (Name and
Department/Organization

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 6 –

TABLE OF CONTENTS
RECORD OF REVIEWS AND REVISIONS ................................ ................................ ............... 3 PLAN DISTRIBUTION ................................ ................................ ................................ ............... 5 SECTION 1: INTRODUCTION ................................ ................................ ................................ ... 9

1.1 Hazard Mitigation Planning ................................ ................................ ............................... 9

1.2 Local Mitigation Planning Requirements ................................ ................................ ..........10

1.3 Hazard Mitigation Plan Description ................................ ................................ ..................10

1.3 Assembly Bill 2140 ................................ ................................ ................................ ..........12

1.4 Grant Programs with Mitigation Plan Requirements ................................ .........................12 \SECTION 2: HAZARD MITIGATION PLANNING PROCESS ................................ .................14

2.1 Plan History ................................ ................................ ................................ .....................14

2.2 Plan Purpose and Authority ................................ ................................ .............................. 14

2.3 Planning Process Description ................................ ................................ ...........................15

2.4 Planning Team ................................ ................................ ................................ .................15

2.5 Community Engagement ................................ ................................ ................................ ..17

2.6 Incorporation into Other Planning Mechanisms ................................ ................................ .18

2.7 Review of Existing Plans, Reports, Technical Documents, and Data ............................... 19 SECTION 3: PLANNING AREA DESCRIPTION ................................ ................................ ......22

3.1 Location and Description ................................ ................................ ................................ .22

3.2 Geology ................................ ................................ ................................ ...........................24

3.3 Climate ................................ ................................ ................................ ............................24

3.4 History ................................ ................................ ................................ .............................24

3.5 Government ................................ ................................ ................................ .....................24

3.6 Economy ................................ ................................ ................................ .........................25

3.7 Demographics ................................ ................................ ................................ .................25

3.8 Land Use ................................ ................................ ................................ .........................26

3.9 Changes in Development ................................ ................................ ................................ 26 SECTION 4: Hazard Identification and Assessment ................................ .............................28

4.1 Hazard Analysis ................................ ................................ ................................ ...............28

4.2 Disaster Proclamation History and Process ................................ ................................ .....28

4.3 Hazard Identification ................................ ................................ ................................ ........30 CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 7 –

4.5 Hazard Profiles ................................ ................................ ................................ ................38

4.5.1 Climate Change ................................ ................................ ................................ ........38

4.5.2 Aquatic Invasive Species ................................ ................................ ..........................44

4.5.3 Dam Failure ................................ ................................ ................................ ..............47

4.5.4 Drought ................................ ................................ ................................ .....................51

4.5.5 Earthquake ................................ ................................ ................................ ...............57

4.5.6 Severe Weather (Severe Wind, Extreme Heat, Severe Rainstorm) ...........................67

4.5.7 Flooding ................................ ................................ ................................ ....................73

4.5.8 Fire ................................ ................................ ................................ ...........................79

4.5.9 Human-Caused Hazards ................................ ................................ ...........................85

4.5.10 Landslide ................................ ................................ ................................ ................91 SECTION 5: RISK ASSESSMENT ................................ ................................ ......................... 100

5.1 Hazard Risk Rating ................................ ................................ ................................ ........ 100

5.2 Populations and Infrastructure At Risk ................................ ................................ ........... 105

5.3 Critical Facilities and Facilities of Concern ................................ ................................ ..... 105

5.4 Analysis of Potential Losses by Hazard ................................ ................................ ......... 109

5.4.1 Aquatic Invasive Species ................................ ................................ ........................ 109

5.4.2 Climate Change ................................ ................................ ................................ ...... 109

5.4.3 Dam Failure ................................ ................................ ................................ ............ 110

5.4.4 Drought ................................ ................................ ................................ ................... 112

5.4.5 Earthquake/Geological Hazards ................................ ................................ .............. 113

5.4.6 Extreme Weather (Severe Winds, Extreme Heat, Severe Rainstorms) ................... 117

5.4.7 Flooding ................................ ................................ ................................ .................. 119

5.4.8 Fire ................................ ................................ ................................ ......................... 122

5.4.9 Landslide ................................ ................................ ................................ ................ 126

5.4.10 Human-Caused Hazards ................................ ................................ ....................... 128 SECTION 6: CAPABILITIES ASSESSMENT ................................ ................................ ......... 131

6.1 Existing Authorities, Policies, Programs, and Resources ................................ ............... 131

6.1.1 Planning and Regulatory Capabilities ................................ ................................ ...... 131

6.1.2 Administrative and Technical Capabilities ................................ ............................... 134

6.1.3 Fiscal Capabilities ................................ ................................ ................................ ... 139

6.1.4 Education and Outreach Capabilities ................................ ................................ ...... 140 CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 8 –

6.2 National Flood Insurance Program Participation ................................ ............................ 141 SECTION 7: MITIGATION STRATEGY ................................ ................................ .................. 143

7.1 Hazard Mitigation Statement ................................ ................................ .......................... 143

7.2 Hazard Mitigation Goals and Objectives ................................ ................................ ........ 143

7.3 Mitigation Actions/Projects and Implementation Strategy ................................ ............... 144

7.4 Previous Mitigation Actions/Projects Assessment ................................ .......................... 144

7.4.1 New Mitigation Actions ................................ ................................ ............................ 146

7.4.2 Mitigation Action Plan ................................ ................................ .............................. 148

7.5 Incorporation into Other Plans ................................ ................................ ........................ 150 SECTION 8: PLAN MAINTENANCE PROCEDURES ................................ ............................ 158

8.1 Monitoring and Evaluation ................................ ................................ ............................. 158

8.2 Plan Update ................................ ................................ ................................ ................... 158

8.3 Continued Public Involvement ................................ ................................ ....................... 159 APPENDIX A – LOCAL MITIGATION PLAN REVIEW TOOL ................................ ................ 161 APPENDIX B – PLANNING TEAM MEETING DOCUMENTATION ................................ ....... 162 APPENDIX C – PUBLIC ENGAGEMENT DOCUMENTATION ................................ .............. 170 APPENDIX D – ACRONYMS AND ABBREVIATIONS ................................ ........................... 192

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 9 –
SECTION 1: INTRODUCTION
The City of Antioch (City) has prepared this update to its Local Hazard Mitigation Plan (LHMP) in order to assess the natural, technological, and human-caused risks to the City so as to reduce the potential impact of the hazards by creating mitigation strategies. The 2025 HMP represents the City’s commitment to create a safer, more resilient, community by taking actions to reduce risk and by committing resources to lessen the effects of hazards on the people and property of the City .

This plan complies with the Federal Disaster Mitigation Act (2000), Federal Register 44 Code of Federal Regulations (CFR) Parts 201 and 206, which modified the Robert T. Stafford Disaster Relief and Emergency Assistance Act by adding a new section, 322 - Mitigation Planning. This law, as of November 1, 2004, requires local governments to develop and submit hazard mitigation plans as a condition of receiving Hazard Mitigation Grant Program (HMGP) and other mitigation project grants. The City Manager’s Office and Police Department have coordinated preparation of the HMP in cooperation with other Antioch departments, community stakeholders, partner agencies, and members of the public.

This introduction to the HMP provides a brief description of hazard mitigation planning, local mitigation plan requirements, and an outline of the 2025 LHMP. There is also an overview of Federal Emergency Management Agency (FEMA) programs and grants related to hazard mitigation.

1.1 Hazard Mitigation Planning
Hazard mitigation is any sustained action taken to reduce or eliminate the long-term risk to human life and property from hazards. In general, hazard mitigation is done to minimize the impact of a hazard event before it occurs, with the goal of reducing losses from future disasters. 44 CFR § 201.1(b) describes the purpose of mitigation planning is for local governments to identify the hazards that impact them; to identify actions and activities to reduce losses from those hazards and to establish a coordinated process to implement the plan, taking advantage of a wide range of resources.

For the City of Antioch (City), hazard mitigation planning is a process in which the City will:

1. Identify and profile hazards that affect the local area.

2. Analyze the population and facilities at risk from those hazards.

3. Develop a mitigation strategy and actions to lessen or reduce the impact of the profiled hazards.

4. Implement the strategy and actions that may involve planning, policy changes, programs, projects, and other activities.

The City’s implementation of mitigation actions, which may be short-term or long-term strategies, is the primary objective of the planning process. This type of planning will supplement the City’s comprehensive emergency management program.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 10 –

1.2 Local Mitigation Planning Requirements
Hazard mitigation planning is governed by the Stafford Act, as amended by the Disaster Mitigation Act of 2000 (DMA 2000), and by federal regulations implementing the Stafford Act. DMA 2000 revised the Stafford Act to require state, local, and tribal govern ments to develop and submit to FEMA a mitigation plan that outlines processes for identifying the natural hazards, risks, and vulnerabilities of the jurisdiction. Plan approval by FEMA is a prerequisite to receiving federal hazard mitigation grant funds.

FEMA promulgated 44 CFR Part 201, the federal regulations governing the planning process, plan content, and the process for obtaining approval of the plan from FEMA to implement the mitigation planning requirements of the Stafford Act. The planning requirements set forth in the CFR are identified throughout this plan mirroring the order of the FEMA Regulation Checklist in the Local Mitigation Plan Review Tool.

Federal law and the State of California’s requirements for hazard mitigation plans require coverage of only natural hazards. The City’s 20 18 Hazard Mitigation Plan does not include technological and human- caused hazards. For the 2025 plan, the planning team decided to cover both natural and technological/human -caused hazards, including a description and analysis of each hazard.

FEMA has produced a Local Mitigation Plan Review Tool, which has been tailored by Region IX as an appendix to the Local Mitigation Planning Handbook (2023), to demonstrate how the mitigation plan meets the regulation in 44 CFR § 201.6 and offers State and FEMA Mitigation Planners an opportunity to provide feedback to the jurisdiction. The Plan Review Tool has a regulation checklist that provides a summary of FEMA’s evaluation of whether the plan has addressed all requirements. Local planners can also use the checklist prior to submitting the plan for approval to ensure they have addressed all the requirements. The Local Mitigation Plan Review Tool Regulation Checklist is provided in Appendix A of this document.

1.3 Hazard Mitigation Plan Description
The 2025 LHMP consists of the sections and appendices described below:

Table 1-1: Plan Sections, Appendices, and Descriptions
Section 1:

Introduction
Section 1 includes an introduction to hazard mitigation planning, lists the LHMP planning requirements, provides a description of the plan, and discusses grants related to hazard mitigation.

Section 2:

Hazard
Mitigation
Planning
Process
Section 2 describes the planning process for the 2025 LHMP, including an overview of how the LHMP was prepared, identification of the LHMP planning team, involvement of outside agencies and communities, the inclusion of related plans, reports, and information, and stakeholder and public outreach activities.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 11 –
Table 1-1: Plan Sections, Appendices, and Descriptions
Section 3:

Planning Area
Description
Section 3 includes a description of the natural and built states of the City, including climate, geography, demographics, land use, and economic conditions.

Section 4:

Hazard
Identification
and Assessment
Section 4 provides a list of the hazards identified in the 2025 LHMP, a profile of each hazard and hazard summary, and a risk assessment of the planning area. Additionally, identifies and evaluates the resources available for hazard mitigation within the City.

Section 5: Risk
Assessment
Section 5 provides a list of the hazards identified in the 2025 LHMP, a profile of each hazard and hazard summary, and a risk assessment of the planning area.

Section 6:

Capabilities
Assessment
Section 6 identifies and evaluates the resources available for hazard mitigation within the City.

Section 7:

Mitigation
Strategy
Section 7 identifies and evaluates the current, ongoing, and completed mitigation projects and programs in the City and lists mitigation strategies for reducing potential losses.

Section 8: Plan
Maintenance
Procedures
Section 8 includes documentation of Cal OES and FEMA processes and adoption of the LHMP by the City Council
Appendix A Appendix A contains the FEMA Local Mitigation Plan Review Tool, which documents the City’s compliance with the local hazard mitigation plan requirements of 44 CFR Part 201.

Appendix B Appendix B contains documentation of the planning process for the planning team, including invitations, attendee lists, meetings minutes, presentations, emails, etc.

Appendix C Appendix C contains documentation of the planning process, including surveys, social media outreach and opportunity for comment for the stakeholders and public, and other stakeholder/public outreach efforts.

Appendix D Appendix D lists acronyms and abbreviations used in the 2025 LHMP.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 12 –

1.3 Assembly Bill 2140
The California Disaster Assistance Act limits the state share for any eligible project to no more than 75% of total state eligible costs, except that the state share shall be up to 100% of total state eligible costs connected with certain events. AB 2140 p rohibits the state share for any eligible project from exceeding 75% of total state eligible costs unless the local agency is located within a city, county, or city and county that has adopted a local hazard mitigation plan in accordance with the federal D MA 2000 as part of the safety element of its general plan, in which case the Legislature may provide for a state share of local costs that exceeds 75% of total state eligible costs.

The California Government Code, Sections 8685.9 and 65302.6, allow for the State Legislature to provide for a state share of local costs that exceeds 75% of total state eligible costs where the local agency is located within a city, county, or city and county that has adopted a local hazard mitigation plan in accordance with the federal Disaster Mitigation Act of 2000 (P.L.106 -390) as part of the safety element of its general plan adopted pursuant to subdivision (g) of Section 65302.

1.4 Grant Programs with Mitigation Plan
Requirements
Currently, three (3) FEMA grant programs provide funding to local entities that have a FEMA - approved local mitigation plan meeting federal hazard mitigation plan requirements. One of the grant programs is authorized under the Stafford Act. The remaining two (2) programs are authorized under the National Flood Insurance Act.

1.4.1 STAFFORD ACT GRANT PROGRAMS
FEMA funding is provided to state, local, and tribal governments that have an approved Hazard Mitigation Plan through the Hazard Mitigation Grant Program.

Hazard Mitigation Grant Program (HMGP)
The HMGP provides grants to implement long-term hazard mitigation measures after declaration of a major disaster. The purpose of the HMGP is to reduce the loss of life and property due to natural disasters and to enable mitigation measures to be implemented during the immediate recovery from a disaster. To qualify for HMGP funding, projects must provide a long-term solution to a problem, and the project’s potential savings must exceed the cost of implementing the project.

HMGP funds may be used to protect either public or private property or to purchase property that has been subjected to, or is in danger of, repetitive damage. The amount of funding available for the HMGP under a particular disaster declaration is limited. Under the program, the federal government may provide a state or tribe with up to 20 % of the total disaster grants awarded by FEMA and may provide up to 75% of the cost of projects approved under the program.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 13 –

1.4.2 NATIONAL FLOOD INSURANCE ACT GRANT PROGRAMS
Flood Mitigation Assistance Grant Program
The goal of the Flood Mitigation Assistance (FMA) Grant Program is to reduce or eliminate flood insurance claims under the National Flood Insurance Program (NFIP). This program emphasizes mitigating repetitive loss (RL) properties. The primary source of fu nding for the FMA program is the National Flood Insurance Fund. Grant funding is available for planning, project, and technical assistance. Project grants are awarded to local entities to apply mitigation measures to reduce flood losses to properties insured under the NFIP. In FY 2014, FMA funding totaled $89 million.

The cost-share for this grant is 75% federal and 25 percent nonfederal. However, a cost-share of 90% federal and 10% nonfederal is available in certain situations to mitigate severe repetitive loss (SRL) properties.

Repetitive Flood Claims Program
The Repetitive Flood Claims (RFC) Program provides funding to reduce or eliminate the long - term risk of flood damage to residential and non -residential structures insured under the NFIP.

Structures considered for mitigation must have had one (1) or more claim payments for flood damage. All RFC grants are eligible for up to 100% federal assistance.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 14 –
SECTION 2: HAZARD MITIGATION PLANNING

PROCESS
The requirements for documentation of the LHMP planning process are described below. This section summarizes the planning area’s hazard mitigation planning efforts in 2025. In addition, the section describes public and stakeholder outreach efforts as part of the LHMP planning process. The section also summarizes the review and incorporation of existing plans, studies, and reports used to develop the LHMP. Documentation of the 2025 LHMP planning process for the Hazard Mitigation Planning Team (HMPT) is provided in Appendix B, and documentation of the process for the public and stakeholders is found in Appendix C. These appendices document the planning meetings and outreach and include meeting agendas, presentation, sign -in sheet, minutes, social media materials and other documentation used to conduct the planning process.

The planning process began with the City establishing the planning team and emailing City stakeholders within the planning area to invite them to participate in the process. The City also posted a notice on its website announcing the planning process that contained a mechanism to provide input and feedback. In addition, the City identified the financial and technical resources required to update the LHMP. Once all the City’s financial and technical resources were identified, the City established the planning team and created a schedule for the process.

2.1 Plan History
The 2025 LHMP is an update of the 2018 Plan. The Plan addresses and consolidates hazards analyzed in the previous plan and adds new hazards such as Human-Caused Hazards, Hazardous Materials, Climate Change, and Aquatic Invasive Species. The 2025 LHMP contains many of the mitigation actions listed in the 2018 version as they are ongoing and still relevant.

2.2 Plan Purpose and Authority
The purpose of the Plan is to identify natural and human-caused hazards that impact the City, to assess the vulnerability and risk posed by those hazards to City -wide human and structural assets, to develop strategies for mitigation of those identified haz ards, to present future maintenance procedures for the plan, and to document the planning process. The Plan is prepared in compliance with DMA 2000 requirements and represents an updated LHMP.

The requirements for adopting this LHMP by all local governing bodies, as set forth in the Stafford Act and as amended by DMA 2000 and its implementing regulations, are described below . The local planning requirements are documented throughout the LHMP and in Appendix A, FEMA Local Mitigation Plan Review Tool. This Plan Review Tool is documented in the governing body meeting resolution contained in Appendix A.

Funding for the development of the Plan was provided by the City’s 2025 Operations Budget.

Navigating Preparedness Associates was retained by the City to provide consulting services in guiding the planning process and Plan development.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 15 –

2.3 Planning Process Description
In December 2024, the planning process for the 2025 LHMP began. Select staff from various departments in the City and other stakeholders were invited to join the Hazard Mitigation Planning Team (HMPT) to develop the 2025 LHMP via an MS Outlook Email. Additionally, representatives from the County of Contra Costa, City of Pittsburg, Brentwood, and Oakley were invited to provide input on the plan via a MS Outlook Email . Documentation of participant outreach and a list of members of the Planning Team are located in Appendices B and C.

Email solicitations were sent to other cities and partners surrounding Antioch, requesting participation in the LHMP planning process via an MS Outlook Email. Documentation of the emails is contained in Appendix C, Public Engagement Process.

2.4 Planning Team
Members of the LHMP planning team are listed in Table 2-1 below.

Table 2-1: LHMP Planning Team
Department or Agency Member Name Key Role
Public Works - GIS Brandon Peters, GIS
Manager
Planning Team Representative/
Plan Reviewer
Public Works - Facilities Jason Bonilla,
Operations Manager
Planning Team Representative/
Plan Reviewer
Public Works Scott Buenting, Public
Works Director
Planning Team Representative/
Plan Reviewer
Police Department Desmond Bittner,
Police Captain
Planning Team Representative/
Plan Reviewer
Public Works - Water
Treatment
Marcus Woodland,
Water Treatment Plant
Manager
Planning Team Representative/
Plan Reviewer
Public Works - City
Engineer
Scott Buenting, Public
Works Director / City
Engineer
Planning Team Representative/
Plan Reviewer
Community Development Kevin Scudero,
Principal Planner
Planning Team Representative/
Plan Reviewer
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 16 –
Economic Development Kwame Reed,
former acting City
Manager
Planning Team Representative/
Plan Reviewer
CrisisMC 911 Doug Pittman Project Support
CrisisMC 911 John Liu Project Support
Navigating Preparedness
Associates (NPA)
Lee Rosenberg NPA Project Manager
Navigating Preparedness
Associates (NPA)
Francisco Soto NPA Lead Planner

2.4.1 PLANNING TEAM ACTIVITIES
Two (2) meetings were held with the planning team: representatives from the City held the responsibility of chairing the planning team. The City project manager reviewed all documents and sent out meeting notices. Appendix B documents the LHMP planning activities. The planning team’s responsibility included providing feedback on hazards that affect the planning area, reviewing drafts of the plan, and participating in developing mitigation activities.

Table 2-2: Planning Activities
Date Activity Purpose
November
21, 2024
LHMP Project Kickoff Meeting
Team Meeting #1
Introduce core Planning Team
members, review the project
management plan, align expectations.

Describe the regulatory issues of
LHMP, the value of them, and the
LHMP planning process. Distribute data
collection forms.

January 9,
2025
LHMP Planning Team Meeting #2 Review potential hazards and select those that pose risks. Use CPRI.

Review status of 2018 mitigation
activities and update status. Review
data-collection-sheet inputs, begin to
develop potential mitigation activities.

Request information for hazard analysis
and potential losses
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 17 –

2.4.2 OTHER JURISDICTIONS AGENCY/ORGANIZATIONAL

PARTICIPATION
External organizations listed below reviewed drafts of the plan. They were invited by an MS Outlook Email to the meetings. Appendix B, Planning Team Meetings notes, documents their engagement. Table 2-3 lists the organizations and attendees that were contacted to participate in the planning process.

Table 2-3: Organization Participation
Organization Staff
Contra Costa County Jimmy Lee
City of Pittsburg Zuna Barker
City of Oakley Danielle Navarro
City of Brentwood Michael Thompson
Chamber of Commerce Jack Monroe
Los Medanos College Johnny Curtis
Red Cross Bay Area Chapter John Ruiz

Copies of the draft LHMP were provided to the City Planning Team, including the participating organizations above, and distributed to the public for their review. Comments received from these partners are incorporated in the final draft of the LHMP and are documented in Appendix C.

2.5 Community Engagement
Once the planning process commenced, the City provided public notification through its website, press releases, and social media accounts. Additionally, the City conducted an online survey to solicit input on the hazards that the city faces and the types of mitigation activities the City should undertake. The draft LHMP was placed on the City website; and hard copies were posted at City Hall and city libraries for public review and comment. Finally, notification of the draft LHMP review and adoption by the City Council was advertised as required by the Brown Act.

The public survey input from the 46 responders was used to select hazards and rank their effects.

Wildfire and earthquakes were ranked as the two top hazards of concern to the public. This input was also used to inform the Calculated Priority Risk Index (CPRI) in Table 5-4. Finally, survey input was used to select mitigation actions. Input from publicly posting the draft LHMP was used to refine the Plan and to prepare it for submission for review. Appendix C contains a full description of the process for and documentation of community outreach efforts and public participation.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 18 –
On March 12th, 2025, the City posted information about the LHMP update process on its website and social media channels; and invited the public to take a Hazard Mitigation Survey to gather information about the public’s knowledge of hazards in the City and their level of preparedness.

Appendix C contains screenshots of the website, social media, and survey. The City also invited surrounding cities and other stakeholders to review the LHMP. Appendix C contains the invitation and feedback received. There were no comments or recommendations for revisions to the draft LHMP received from the public or neighboring jurisdictions.

2.6 Incorporation into Other Planning Mechanisms
The LHMP planning process provided the City with an opportunity to review and expand on policies contained in its capital improvement plan (CIP) and other plans. The City views the CIP and the hazard mitigation plan as complementary documents that work together to reduce risk exposure to the residents of its service area. Many of the ongoing recommendations identified in the LHMP are programs or projects that are in the CIP.

The City will incorporate hazard mitigation identificati on and risk assessment, and plan recommendations and mitigation actions contained in the LHMP into the following documents:
• City of Antioch Emergency Operations Plan – Hazards identified in this LHMP were incorporated into the EOP. The EOP incorporates hazard profiles and mitigation strategies from the LHMP for a cohesive response framework. The team e nsured response objectives align with the risk identified in the LHMP.
• Capital Improvement Plan (CIP) – Aligned LHMP actions with climate adaptation strategies to address the increasing frequency and severity of hazards due to climate change. The Planning Team ensured the updated CIP’s goals align with the 2025 LHMP • City of Antioch General Plan
o When possible, updated the Housing Element, Safety Element, and/or local hazard mitigation plan concurrently or sequentially to synchronize long -term integration and meet SB 1035 requirements.
o Incorporated Hazard Mitigation Goals: Embed the LHMP's goals and objectives into the city's general plan to ensure alignment with broader land use and development policies.
o Land Use Policies: Updated zoning and land use policies to reflect hazard mitigation priorities, such as restricting development in flood-prone areas.

Incorporating action items and processes from the 2025 LHMP into various planning documents will be completed as other plans are updated, and new plans are developed. These efforts may coincide with the Plan Maintenance Method and Schedule activities listed in Section 8. Additional action items may be implemented by creating new public educational programs, continued interagency coordination, and public input and participation. Additional action items may be implemented by creating new public educational pr ograms, continued interagency coordination, and public input and participation.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 19 –

2.7 Review of Existing Plans, Reports, Technical
Documents, and Data
In updating the LHMP, the Planning Team used a large number of resource documents and references. Table 2-4 contains a comprehensive list of guidance, policy tools, extant plans, and authorities incorporated to create the current Plan.

Table 2-4: Resource Documents and References Reviewed
and Incorporated in the Plan
Referenced Document or
Technical Source Resource Type Description of Reference and Its Use California Energy Commission
(2018). California’s Fourth
Climate Change Assessment
https://www.energy.ca.gov/data-
reports/reports/californias-fourth-
climate-change-assessment
Technical and
Planning
Resource
Describes monitoring, analysis,
and modeling of climate as well as
efforts designed to reduce emissions.

FEMA Dam Safety
https://www.fema.gov/emergency
-managers/risk-
management/dam-safety
Technical
Resource
Database used in the dam failure hazard
profiling. Used in the risk assessment.

National Weather Service
https://www.weather.gov/
Technical
Resource
Source for hazard information, data sets,
and historical event records. Used in the
risk assessment.

United States Geological
Survey Earthquake Hazards
Program.
https://www.usgs.gov/programs/e
arthquake-hazards
Technical Data Source for geological hazard data and
incident data. Used in the risk
assessment.

Western Regional Climate
Center
https://wrcc.dri.edu/
Website Data Online resource for climate data used in
climate discussion.

California Department of
Conservation
https://www.conservation.ca.gov/
cgs/geohazards
Technical and
Planning
Resource
Identifies significant geologic hazards
that exist, or are likely to exist, so that
informed land use and emergency
response planning decisions can be
made.

California Department of Water
Resources
Technical and
Planning
Resource
Provides information on dam safety, a
list of dams within California and dam
inundation maps for dams in the
planning area.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 20 –
Table 2-4: Resource Documents and References Reviewed
and Incorporated in the Plan
Referenced Document or
Technical Source Resource Type Description of Reference and Its Use https://water.ca.gov/Programs/All
-Programs/Division-of-Safety-of-
Dams/Inundation-Maps
https://fmds.water.ca.gov/webgis/
?appid=dam_prototype_v2
Federal Emergency
Management Agency
Technical and
Planning
Resource
Resource for LHMP guidance (How-To
series), floodplain and flood-related NFIP
data (mapping, repetitive loss, NFIP
statistics), and historic hazard incidents.

Used in the risk assessment and
mitigation strategy.

Cybersecurity & Infrastructure
Security Agency
https://www.cisa.gov/
Technical and
Planning
Resource
Resource for cybersecurity and
cyberattack guidance, especially
regarding critical infrastructure and
public utilities. Describes historical
cybersecurity incidents and lessons
learned. Used in the risk assessment
and mitigation strategy.

HAZUS-MH Technical
Resource
Base data sets within the program were
used in the vulnerability analysis.

National Centers for
Environmental Information
https://www.ncdc.noaa.gov/data-
access
Technical
Resource
Online resource for weather-related data
and historic hazard event data. Used in
the risk assessment.

National Integrated Drought
Information System (2025)
https://www.drought.gov/drought/
Technical
Resource
Source for drought-related projections
and conditions. Used in the risk
assessment.

California Energy Commission
(2018). California’s Fourth
Climate Change Assessment
https://www.energy.ca.gov/data-
reports/reports/californias-fourth-
climate-change-assessment
Technical and
Planning
Resource
Describes monitoring, analysis,
and modeling of climate as well as
efforts designed to reduce emissions.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 21 –
Table 2-4: Resource Documents and References Reviewed
and Incorporated in the Plan
Referenced Document or
Technical Source Resource Type Description of Reference and Its Use California Governor’s Office of
Emergency Services
http://myhazards.caloes.ca.gov/
Technical and
Planning
Resource
Provides a tool for the general public to
discover hazards in their area
(earthquake, flood, fire, and tsunami)
and learn steps to reduce personal risk.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 22 –
SECTION 3: PLANNING AREA DESCRIPTION
The following section provides an overview of the City’s planning area. It includes a description of the natural and population characteristics.

3.1 Location and Description
Antioch is a city in the East Bay region of the San Francisco Bay area at the confluence of the Sacramento and San Joaquin Rivers, at the gateway to the agriculturally rich San Joaquin Delta.

The city is slightly more than 50 miles east of San Francisco an d 55 miles southwest of Sacramento (at 38°00'N, 121°48'21 "W). The City has a total area of 28.16 square miles. Figure 3-1 on the next page shows the City’s boundaries.

Antioch is home to 31 parks covering 310 acres, with an additional 600 acres of City-owned open space. It has 11 miles of walking paths connecting communities to parks and schools. Within its boundaries, Antioch has Contra Loma Regional Park, the Antioch/Oakley Regional Shoreline and a portion of the Black Diamond Mines Regional Park, and the Mokelumne Coast to Crest Trail and Delta De Anza. Regional Trail. These three parks cover 6,493 acres: approximately 38 % of Antioch's total area. Just outside Antioch' s city limit is the 2,024 -acre Round Valley Regional Preserve. In addition, established in 1980, the Antioch Dunes National Wildlife Refuge was the first national wildlife refuge in the country established for the purpose of protecting endangered plants and insects. It is located on the south shore of the San Joaquin River in Antioch.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 23 –

Figure 3-1: City Boundary

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 24 –

3.2 Geology
Antioch is situated on a varied geological landscape that includes sedimentary formations created by the ancient river systems of the Sacramento and San Joaquin Rivers. These formations consist of alluvial soils and river deposits that have accumulated over millennia, contributing to the fertile lands that are ideal for agriculture. The City's terrain features rolling hills and leveled plains, with significant geological diversity in its regional parks. The Black Diamond Mines Regional Park, located within Antioch's boundaries, showcases the coal mining history with exposed coal seams and sandstone formations. This area provides a glimpse into the geological processes and historical mining activities that shaped the region.

3.3 Climate
The climate is mild, with annual temperatures ranging between a high of 96°F and a low of 34°F.

Humidity levels are generally low, and the City's riverfront location often provides cooling breezes.

Annual rainfall is just over 15.4 inches, the majority of which falls between October and May.

Average annual snowfall is essentially zero (0).

3.4 History
In 1849, the town was founded by brothers William and Joseph Smith, who named the town Smith's Landing. On February 5, 1850, Joseph Smith died of malaria and his brother moved to a higher ground overlooking the river. On July 4, 1851, William Smith held a picnic for the town residents on the bluff near his home. They discussed naming the community and Smith finally suggested the biblical name of Antioch, a town in Syria where the Christians were first named.

Antioch was the name chosen and dedicated to the memory of Joseph.

Around 1859, coal was discovered in the hills south of Antioch, and coal mining formed the first substantial business in the area apart from farming and dairying. In 1872, Antioch incorporated as a General Law city. The town continued to prosper into the 1 900s, becoming a "blue collar" factory community also supporting a fishing and commercial boating industry. In the latter part of the 1900s, as the factories began to close or move elsewhere, Antioch began to take on a new look.

Today, Antioch is mainly a "bedroom" community, with most adults working in central Contra Costa County and larger cities toward Oakland and San Francisco. The City has seen an enormous amount of growth in the last 25 years as the population of the greater Bay Area grew.

The City will continue to grow as real estate prices force families to move toward the suburbs.

3.5 Government
The City has a Council/Manager form of government. Policy making and legislative authority is vested in a five (5)-member City Council consisting of a Mayor and four Council Members. The four (4) Council Members are elected to four (4)-year overlapping terms. The Mayor is directly elected to a four(4)-year term. The City Council assumes responsibility for adoption of this plan, and the City Manager will oversee its implementation. The City Council presides over and adopts CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 25 –
the City's annual budget and financial affairs; appoints commissions and committees; and hires and supervises the City Manager and City Attorney. City Council members are responsible for service to the citizens, businesses, and policies of the City. The City Manager advises City Council; supervises personnel and all City departments; enforces ordinances and programs approved by City Council; and oversees day-to-day City government operations.

3.6 Economy
Antioch has a healthy workforce, diverse and educated in a variety of industries. One of the City’s top industries is healthcare. Antioch has two (2) major hospitals, Kaiser Permanente and Sutter Health. There is a demand for office space, products, and companies moving to Antioch that serve this industry. Retaining and growing is fueled by its educational institutions of Dozier-Libby Medical High School and Contra Costa Medical Career College. Antioch is strategically laid out and lends itself to growth more industries. Antioch has a variety of market rate housing projects in the pipeline. Planning for growth, the City has large areas where companies can create a campus for technology, manufacturing, and innovation.

3.7 Demographics
The demographics of Antioch reflect the City’s rich diversity and evolving population. The racial composition of the City includes a mix of White, African American, Hispanic, Asian, and other ethnic groups, contributing to the multicultural fabric of the community. This diversity is celebrated through various cultural events, festivals, and community programs that highlight the traditions and contributions of each group.

The age demographics of Antioch show a balanced distribution across different age groups. The City is home to a significant number of young families, with a notable percentage of residents under the age of 18. This younger demographic is supported by numerous educational institutions, recreational facilities, and family -oriented services. Meanwhile, the presence of a substantial adult and senior population ensures a blend of experience and wisdom, with many residents actively participating in civic and social activities. Table 3-1 summarizes the City’s ethnic make-up.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 26 –
Table 3-1: City Demographics
Total
Population,
All Races
Population of One Race Alone
Two (2)
or More
Races
Hispanic or
Latino
(Overlaps
with other
race
categories)
American
Indian &
Alaska
Native
Asian
Black or
African
American
Native
Hawaiian
& Other
Pacific
Islander
White
(Not
Hispanic
or
Latino)
Some
Other
Race
117,096 1.6% 13.6% 19.7% 1.1% 29.5% 16.6% 36.1%

Note: Population by race for each racial category is also shown as a percentage of the total population for that community. U.S. Census estimates based upon data and surveys collected by the American Community Survey over a five(5)-year period. These estimates are issued annually between full Decennial Census counts conducted each decade.

3.8 Land Use
Antioch's land use is diverse and strategically planned to accommodate the City's growing population and industries. The City is characterized by a mix of residential, commercial, industrial, and open space areas. Residential zones include a variety of housing types, from single -family homes to multi -family apartments, catering to the needs of their diverse population. The commercial areas are concentrated along major thoroughfares, providing retail, dining, and service options for residents and visitors.

Industrial zones are located mainly in the southern parts of the city, where manufacturing, technology, and innovation campuses are encouraged to establish and thrive. Additionally, Antioch has set aside significant areas for parks and recreational spaces, preserving natural landscapes and providing outdoor amenities for the community.

3.9 Changes in Development
Tracking previous and future growth in potential hazard areas provides an overview of increased exposure to hazards within a community. Hazard mitigation plan updates must be revised to reflect changes in development within the planning area during the previous performance period of the plan, as stated in 44 CFR Section 201.6(d)(3). The plan must describe changes in development in hazard- prone areas that increased or decreased vulnerability since the last plan was approved.

The City has adopted a general plan that governs land -use decisions and policymaking, as well as a building code and specialty ordinances based on state and federal mandates. This hazard mitigation plan update assumes that some new development over the per formance period occurred in hazard areas. All new development would have been regulated pursuant to local programs and codes, such as the International Building Code and flood damage prevention requirements of the National Flood Insurance Program (NFIP). T herefore, it is assumed that CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 27 –
hazard vulnerability did not measurably increase, even if exposure did. Figure 3-2 shows the land use diagram.

Figure 3-2: City Land Use Diagram

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 28 –
SECTION 4: HAZARD IDENTIFICATION AND

ASSESSMENT
This section of the LHMP includes requirements for hazard profiles and a risk assessment, as provided in the CFR. The goal of mitigation is to reduce the future impacts of hazards, including loss of life, property damage, disruption to the local economy, and the expenditure of public and private funds for recovery.

4.1 Hazard Analysis
A hazard analysis consists of identifying, screening, and profiling each hazard. The hazard analysis encompasses natural, human-caused, and technological hazards. Natural hazards result from unexpected or uncontrollable natural events of significant size a nd destructive power.

Human-caused hazards result from human activity and encompass technological hazards.

Technological hazards are generally accidental or result from events with unintended consequences (for example, accidental release of hazardous materials).

The goal of mitigation is to reduce the future impacts of hazards, including loss of life, property damage, disruption to the local economy, and the expenditure of public and private funds for recovery. Hazard identification was conducted as part of the planning process.

4.2 Disaster Proclamation History and Process
When there is a condition of extreme peril or potential peril to the safety of persons and property, and the condition is beyond the capability of the local jurisdiction to control effectively, the local governing body (city council, board of supervisors, or a person authorized by ordinance) may proclaim that a local emergency exists. The local government may request the California Governor’s Office of Emergency Services (Cal OES) Director to concur in their proclamation of a local emergency and to provide assistance under the California Disaster Assistance Act (CDAA).

A copy of the resolution must be provided to the Operational Area as soon as possible for transmission to Cal OES. When a county proclaims a local emergency pursuant to Section 8630 of the Government Code, based upon conditions which include both incorpora ted and unincorporated territory of the county, it is not necessary for the cities to also proclaim the existence of a local emergency independently.

If sufficient conditions occur, the state may proclaim a state of emergency to fully commit state and mutual aid assistance and provide resources to assist local government. Following the proclamation of a state of emergency, the Cal OES Director may recommend that the Governor request a Presidential declaration of a major disaster under the authority of Public Law 93 -288.

The Governor’s request to the president is submitted through FEMA.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 29 –
Table 4-1 below lists the state and federal disaster declarations affecting Contra Costa County since 1969. In the last 5 years, there have not been any disaster declarations affecting Contra Costa County for dam failure, extreme heat, and fire.

Table 4-1: Contra Costa County Disaster Proclamation History Since 1969 Year Disaster # Incident Type Declaration Title
2023 DR-4683-CA Flood SEVERE WINTER STORMS, FLOODING,

LANDSLIDES, AND MUDSLIDES
2023 EM-3591-CA Flood SEVERE WINTER STORMS, FLOODING, AND

MUDSLIDES
2020 DR-4482-CA Biological COVID-19 PANDEMIC
2020 EM-3428-CA Biological COVID-19
2017 DR-4308-CA Flood SEVERE WINTER STORMS, FLOODING, AND

MUDSLIDES
2017 DR-4305-CA Flood SEVERE WINTER STORMS, FLOODING, AND

MUDSLIDES
2017 DR-4301-CA Severe Storm SEVERE WINTER STORMS, FLOODING, AND

MUDSLIDES
2006 DR-1628-CA Severe Storm SEVERE STORMS, FLOODING, MUDSLIDES,

AND LANDSLIDES
2005 EM-3248-CA Hurricane HURRICANE KATRINA EVACUATION
1998 DR-1203-CA Severe Storm SEVERE WINTER STORMS AND FLOODING 1997 DR-1155-CA Severe Storm SEVERE STORMS, FLOODING, MUD AND

LANDSLIDES
1995 DR-1046-CA Severe Storm SEVERE WINTER STORMS, FLOODING

LANDSLIDES, MUD FLOW
1995 DR-1044-CA Severe Storm SEVERE WINTER STORMS, FLOODING,

LANDSLIDES, MUD FLOWS
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 30 –
1993 DR-979-CA Flood SEVERE WINTER STORM, MUD & LAND

SLIDES, & FLOODING
1990 DR-845-CA Earthquake LOMA PRIETA EARTHQUAKE
1986 DR-758-CA Flood SEVERE STORMS & FLOODING
1983 DR-677-CA Coastal Storm COASTAL STORMS, FLOODS, SLIDES &

TORNADOES
1982 DR-651-CA Flood SEVERE STORMS, FLOOD, MUDSLIDES &

HIGH TIDE
1980 EM-3078-CA Coastal Storm TORRENTIAL RAIN, HIGH TIDE & WINDS 1977 EM-3023-CA Drought DROUGHT
1969 DR-253-CA Flood SEVERE STORMS & FLOODING

4.3 Hazard Identification
A list of all hazards that had the potential to occur in the City was presented to stakeholders in the first planning team meeting and to the general public through a survey. The list of hazards was derived from the previous LHMP, the Emergency Operations Plan, the Contra Costa County Hazard Mitigation Plan (CCC HMP), and the 2023 California State Hazard Mitigation Plan. The 2018 LHMP contained the following hazards:
• Earthquake • Dam and Levee Failure
• Severe Weather • Wildfire
• Landslide • Sea Level Rise
• Flood • Tsunami
• Drought

FEMA guidance identifies several hazards that communities should evaluate for inclusion in a hazard mitigation plan. Communities may also consider additional hazards for their plans. The HMPT reviewed the previous hazards in the 2018 plan and discussed other potential hazards, excluding ones that do not pose a threat or are not a significant concern to Antioch.

Table 4-2 lists all the hazards considered and explains the reasoning for inclusion/exclusion. For context, this table also shows if a hazard is recommended for consideration by FEMA, if it is included in the 2023 California State Hazard Mitigation Plan (SHMP), and if it is included in the CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 31 –
CCC LHMP.

Table 4-2: Hazard Evaluation for Antioch LHMP
Hazard Recommendation
for Consideration
Included in
LHMP?
Reason for Inclusion or
Exclusion
Agricultural
Pests
SHMP No Most farmland has been replaced
by new residential and commercial
developments. Without the
presence of these large agricultural
areas in the community, the HMPT
did not identify this as a hazard of
concern for the City.

Air Pollution SHMP No Air pollution is a state and regional issue that is addressed through
plans and regulations administered
by the Air Quality Management
District and/or California Air
Resources Board. Since the City
does not regulate these resources,
the HMPT did not identify this as a
hazard of concern that could be
addressed in this plan.

Aircraft Incident SHMP No Given the lack of control over any airport in the area, the HMPT
determined that this hazard should
not be included in the plan.

Aquatic Invasive
Species
SHMP Yes Antioch Reservoir is susceptible to
aquatic invasive species.

Avalanche FEMA guidance
SHMP
No Antioch is not located within
potential avalanche zones.

Civil Disturbance
or Riot
SHMP No The Planning Team did not include
this in the plan.

Climate Change SHMP

CCC HMP
Yes Climate change is discussed as a
function of each relevant hazard
and is mentioned throughout the
Plan.

Coastal Flooding
and Storm
FEMA guidance
SHMP

Yes Antioch is located along the coast
of California. Coastal flooding
associated with climate change
and high tides is possible.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 32 –
Table 4-2: Hazard Evaluation for Antioch LHMP
Hazard Recommendation
for Consideration
Included in
LHMP?
Reason for Inclusion or
Exclusion
Cyber Threats SHMP

CCC HMP
Yes With the increase in cyber threats
occurring throughout California and
the nation, the HMPT is concerned
about the potential effects on vital
records, communications, and
industrial control systems.

Dam Failure FEMA guidance
SHMP

CCC HMP
Yes Antioch is located downstream of
Antioch Reservoir, classified by the
California Department of Water
Resources as an extremely high
danger dam, operated by the City.

Due to City's location downstream
of these facilities, the HMPT
identified dam failure as a hazard
of concern.

Drought SHMP

CCC HMP
Yes While the HMPT is confident in the
current hydrologic infrastructure to
supply water for the City, drought
can potentially impact the
operations of Antioch Public
Works. The HMPT does not
consider drought to be a local issue
alone, but rather a regional one. It
is addressed in both the State and
Contra Costa County HMP's.

Loss of Power SHMP

CCC HMP
Yes Loss of power can affect critical
infrastructure services such as the
City’s water infrastructure.

Epidemic,
Pandemic,
Vector-Borne
Disease
SHMP No Antioch is in Contra Costa County,
which has experienced several
health-related incidents in the past.

The HMPT felt it was best to
address issues with infectious
diseases and other public health
issues through the County
Department of Public Health
preparedness planning
mechanisms.

Erosion FEMA guidance
SHMP
No Erosion does not affect land within
the City.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 33 –
Table 4-2: Hazard Evaluation for Antioch LHMP
Hazard Recommendation
for Consideration
Included in
LHMP?
Reason for Inclusion or
Exclusion
Expansive Soil FEMA guidance No Expansive soils were not identified by the HMPT as a hazard of
concern. While they could exist, the
City requires compliance with the
California Building Code, which is
intended to mitigate hazards
associated with this condition.

Extreme Cold FEMA guidance
SHMP
No Temperatures in the City do not
reach a level that would be
considered a danger to public
safety. Due to this the HMPT did
not identify this as a hazard of
concern.

Extreme Heat FEMA guidance
SHMP

CCC HMP
Yes Extreme heat scenarios have
occurred in the past. The most
recent was in 2024 where the 4th of
July Parade was cancelled due to
extreme heat and cooling centers
were provided.

Fault Rupture FEMA guidance
SHMP

CCC HMP
Yes There are various faults that have
the potential to impact Antioch,
including the Concord-Green
Valley Fault, Hayward Fault,
Greenville Fault, and San Andreas
Fault. As a result, the HMPT
identified this as a hazard of
concern to the City. Fault rupture is
included in the discussion of
Seismic Hazards.

Flooding FEMA guidance
SHMP

CCC HMP
Yes There have been several flooding
events in the City, because of this
the HMPT identified flooding as a
hazard of concern.

Fracking SHMP No Fracking does not occur in the City.

Hail FEMA guidance No Hail severe enough to pose a
threat to people and property is too
rare in Antioch to be included.

Hazardous
Materials release
SHMP

CCC HMP
Yes There are several facilities in and
around Antioch that could cause
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 34 –
Table 4-2: Hazard Evaluation for Antioch LHMP
Hazard Recommendation
for Consideration
Included in
LHMP?
Reason for Inclusion or
Exclusion
Hazardous Materials release.

These include the Corteva plant,
nearby refineries, and railroads that
traverse the city.

Hurricane FEMA guidance
SHMP
No Hurricanes do not occur in Antioch.

Although the effects of Tropical
Storm Hillary impacted the City in
August 2023, no fatalities from
Hillary were reported in the state.

Infrastructure
Failure
SHMP Yes Infrastructure failure can pose a
threat to people and property in
Antioch. The water treatment plant
is a critical infrastructure that could
be vulnerable.

Landslide FEMA guidance
SHMP

CCC HMP
Yes Landslides associated with
earthquakes can occur in the hilly
sections of the City.

Levee Failure SHMP No The City is not responsible for any levees.

Lightning FEMA guidance No Although lightning does
occasionally occur in Antioch, it
does not pose a significant threat
to people or property.

Liquefaction FEMA guidance
SHMP

CCC HMP
Yes According to mapping prepared by
the California Geological Survey, a
large area of the City is prone to
liquefaction. This hazard is
included in the discussion of the
Seismic Hazards section.

Methane
Containing Soils
CCC HMP No The City does not have methane-
containing soils that pose a threat
to the public health and safety of
residents and businesses. The
HMPT did not identify this as a
hazard of concern to the City.

Natural Gas
Pipeline Hazards
SHMP No Natural gas pipelines traverse
Antioch, posing a danger to people
and property if they were to breach
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 35 –
Table 4-2: Hazard Evaluation for Antioch LHMP
Hazard Recommendation
for Consideration
Included in
LHMP?
Reason for Inclusion or
Exclusion
and release their contents. The
HMPT feels these events are rare
and do not pose a significant threat
to the population.

Oil Spills SHMP No There is no history of oil drilling and extraction within the City. Based on
this, the HMPT did not identify this
as a hazard of concern to the City.

Power Failure SHMP Yes Power Failure events have
occurred in the planning area
Radiological
Accidents
SHMP No There are no known major sources
of radiation in Antioch or the
immediate surrounding area that
could pose a serious threat to the
community.

Sea-level Rise FEMA guidance
SHMP
No The HMPT did not identify this as a
hazard of concern for the City
Seiche FEMA guidance
SHMP
No There are no major enclosed
bodies of water in Antioch that
could be subjected to seiche.

Seismic Shaking FEMA guidance
SHMP

CCC HMP
Yes Antioch is in a seismically active
area where shaking can be severe
enough to damage property or
cause loss of life. For this reason,
the HMPT determined it should be
addressed in this plan.

Severe Wind FEMA guidance

CCC HMP
Yes Severe Weather includes
discussions regarding extreme
heat, severe wind, and rain, which
are weather-related hazards that
are most common in Antioch.

Severe Weather
and Storms
FEMA guidance
SHMP

CCC HMP
Yes Severe Weather includes
discussions regarding extreme
heat, severe wind, and rain, which
are weather-related hazards that
are most common in Antioch.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 36 –
Table 4-2: Hazard Evaluation for Antioch LHMP
Hazard Recommendation
for Consideration
Included in
LHMP?
Reason for Inclusion or
Exclusion
Storm Surge FEMA guidance No Antioch is a coastal community and has been impacted by storm surge
in the past. The HMPT did identify
this as a hazard of concern to the
City.

Subsidence FEMA guidance No Subsidence is not discussed as a stand-alone hazard but rather is a
function of the Seismic Hazards
profile.

Terrorism SHMP

CCC HMP
No

The HMPT was not concerned
about terrorism incidents posing a
threat to public safety.

Thunderstorm SHMP

CCC HMP
No Thunderstorms that cause damage
and endanger public safety are
rare in the California region. The
HMPT did not identify this as a
hazard of concern.

Tornadoes FEMA guidance
SHMP

CCC HMP
No An EF1 tornado was verified in
Brentwood, CA, a nearby city, on
January 23, 2010. It caused
$25,000 of damage. This is the
only tornado reported in the county
since 2000. An EF1 tornado
touched down in Scotts Valley in
Santa Cruz County on December
14, 2024 . Five (5) people were
injured, and several cars were
flipped over. Due to its rare
occurrence, the HMPT did not
identify this as a hazard of concern.

Transportation
Accidents
SHMP No The HMPT did not identify this as a
hazard of concern.

Tree Mortality SHMP No The HMPT noted that the City's
has a significant number of trees,
however the City currently
manages these resources
effectively and did not feel it was
necessary to profile as a hazard of
concern.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 37 –
Table 4-2: Hazard Evaluation for Antioch LHMP
Hazard Recommendation
for Consideration
Included in
LHMP?
Reason for Inclusion or
Exclusion
Tsunami FEMA guidance
SHMP

CCC HMP
No Although Antioch is a coastal
community, Antioch is not in a
Tsunami inundation zone. The
HMPT did not identify this as a
hazard of concern to the City
Urban Fire SHMP CCC HMP Yes The HMPT identified urban fires as a risk to property and life in
Antioch.

Volcano SHMP No There are no volcanoes near
Antioch to reasonably pose a
threat. The HMPT did not identify
this as a hazard of concern to the
City
Wildland Fire FEMA guidance
SHMP
Yes Portions of the City are in the very
high fire danger zone as
determined by Cal Fire.

Following hazard evaluation by the HMPT, this Plan identified 10 broad hazard types with their respective sub-categories. During a review of the 2018 hazards, the planning team decided to remove Tsunami as a hazard of concern since the City is not in a tsunami inundation zone and add new hazards such as Human-Caused Hazards, Hazardous Materials, Climate Change, and Aquatic Invasive Species.

The planning team also decided to combine extreme heat, Severe Winds, and Severe Rainstorm into a single hazard named Extreme Weather. Additionally, the planning team combined Cyber Attack, Power Outage, Hazardous Materials Release, and Infrastructure Failure into a single hazard, Human-Caused Hazards.

Table 4-3: Hazards Profiled in 2025 Plan
Hazard Type Sub-Categories
Aquatic Invasive Species N/A
Climate Change N/A
Dam Failure N/A
Drought N/A
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 38 –
Table 4-3: Hazards Profiled in 2025 Plan
Hazard Type Sub-Categories
Earthquake/Geologic Hazards Seismic Shaking
Subsidence
Liquefaction
Fault Rupture
Landslide N/A
Severe Weather Severe Winds
Extreme Heat
Severe Rainstorm
Flooding Urban Flooding
Coastal Flooding
Fire Wildland Fire
Urban Fire
Hazardous Materials Release Profiled in Human Caused Hazards Human-Caused Hazards Cyber Attack
Power Outage
Hazardous Materials Release
Infrastructure Failure

4.5 Hazard Profiles
The hazards that exist in the City are profiled below. Each hazard profile includes a description of the type, location, extent, previous occurrences, regulatory environment, and probability of future events within the description. Maps and graphs are used in this plan to display hazard identification data.

The 2025 LHMP lists 10 broad hazard categories that affect the planning area based on historical information, the presence of the hazard, and the likelihood of future occurrences of the hazard.

Hazard profiles serve as the basis for the hazard assessment.

4.5.1 CLIMATE CHANGE
Hazard Description
The earth’s climate is changing. The State has warmed about 2 .0°F in the last century. Heat waves are becoming more common throughout the southwestern United States, and snow is melting earlier in spring. In the coming decades, changing climate is likely to decrease the CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 39 –
Colorado River's water flow, threaten livestock's health, increase the frequency and intensity of wildfires, and convert some rangelands to the desert.

The U.S. Environmental Protection Agency (EPA) describes climate change as “ any significant change in the measures of climate lasting for an extended period. In other words, climate change includes major changes in temperature, precipitation, or wind patterns, among other effects, which occur over several decades or longer.”
Many people confuse climate change with global warming, the recent and ongoing rise in global average temperatures near Earth’s surface. However, global warming represents only one aspect of climate change. The Earth’s average temperature has risen by 1.4°F over the past century and is projected to rise another 2.0°F to 11.5°F over the next hundred years. Rising globa l temperatures have been accompanied by changes in weather and climate. Many places have seen changes in rainfall, resulting in more floods, d roughts, or intense rain, as well as more frequent and severe heat waves. The planet's oceans and glaciers have also experienced changes, with every glacier and permanent icefield in the State of California receding or melting entirely. Oceans are warming and becoming more acidic, ice caps are melting, and sea levels are rising. The effects of these indicators include:
• Greenhouse Gases: Human activities have increased the emissions of greenhouse gases. As a result of the increase in emissions, average concentrations of heat-trapping gases in the atmosphere are also increasing.
• Weather and Climate : Average U.S. and global temperatures are increasing while weather and climate attributes, such as precipitation, drought and tropical cyclone activity, are changing.
• Oceans: Average oceanic temperatures are increasing. Sea levels are rising worldwide due to thermal expansion and increases from ice melt, and waters are becoming more acidic.
• Snow and Ice: Glaciers in the U.S. and worldwide are generally shrinking, while snowfall and snow cover in the U.S. have decreased overall. The extent of the Arctic Sea ice is declining.
• Health and Society: Warmer temperatures and later fall frosts allow ragweed plants to produce pollen later into the year, potentially prolonging allergy season. The length of ragweed pollen season has increased at 10 out of 11 locations studied in the central U.S. and Canada since 1995. The change becomes more pronounced from south to north. • Ecosystems: Many areas are experien cing earlier spring events, such as peak stream runoff and flower blooms. Bird migration patterns are changing, and wildfire zone size has increased.

History
Climate change has occurred throughout the planet's history due to variations in the earth’s inclination to the sun, volcanic activity, and other factors such as asteroid impacts and the amount of solar radiation reaching the earth’s surface rises and falls. The planet's temperature correlates to the amount of solar radiation arriving at the surface and the climate with it.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 40 –
In relatively recent history, the last glacial period, popularly known as the Ice Age, occurred from c. 110,000 to 12,000 years ago. This most recent glacial period is part of a larger pattern of glacial and interglacial periods known as the Quaternary glaciation (c. 2,588,000 years ago to present).

From this point of view, scientists consider this "ice age" to be merely the latest glaciation event in a much larger ice age that dates back over two (2) million years and is still ongoing.

During this last glacial period, there were several changes between glacier advance and retreat.

The Last Glacial Maximum, the maximum extent of glaciation within the last glacial period, was approximately 22,000 years ago. While the general pattern of global cooling and glacier advance was similar, local differences in the development of glacier advance and retreat make it difficult to compare the details from continent to continent. Generally, temperature variation and glaciation patterns have lagged in atmospheric carbon dioxide (CO2) content.

Figure 4 -1 depicts global variations during the past 400,000 years as a correlation between temperature and atmospheric CO2 content in part per million.

Figure 4-1: Temperature and Atmospheric CO2 Variation Past 400,000 Years

The planet has slowly warmed over the last 22,000 years and the glaciers have retreated to high northern latitudes and mountains. In the last several decades of this period, human activity has likely led to a rapid increase in atmospheric CO 2 and a matching rise in global temperature. The result has been that climate change may be accelerating. Figure 4 -2 provides a graphical depiction of the recent history of temperature rise.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 41 –

Figure 4-2: Temperature Rise Since 1880
Location
Warming and climate change are occurring globally with wide variations based on location and latitude. The polar regions have experienced particularly rapid changes in climate with increased ice melt and more sea -ice-free days. Climate change by its very d efinition is a global phenomenon, and so it is expected to affect the entire City.

Extent
Climate change is likely to affect the entire earth’s population. More widespread drought and associated crop failure, movement of invasive species, more frequent wildfires, increased energy emergencies, and more intense climate events such as storms and e xtreme heat will occur throughout California. The entire planning area is subject to climate change.

Specific Likely Impacts on California
Increasing droughts and higher temperatures will likely affect California’s top agricultural products, including cattle, dairy, and vegetables. Hot temperatures threaten the health of cows and cause them to eat less, grow more slowly, and produce less milk . Livestock operations could also be impaired by fire, the lack of water, and changes in the landscape from grassland to woody shrubs, more typical of a desert. Reduced water availability would also create challenges for irrigated farms, which account for two-thirds of the water used in the state.

Wildfires, changing landscapes, higher temperatures, and drought are likely to increase the severity, frequency, and extent of wildfires which could harm property, livelihoods, and human health. On average, more than two percent (2%) of the land in California has burned per decade since 1984. Wildfire smoke can reduce air quality and increase medical visits for chest pains, respiratory problems, and heart problems. The combination of more fires and drier conditions may expand deserts and otherwise change parts of California’s landscape. Many plants and animals

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 42 –
living in arid lands are already near the limits of what they can tolerate. A warmer and drier climate would generally extend deserts to higher elevations and expand their geographic ranges.

In some cases, native vegetation may persist and delay or prevent the expansion of the desert.

In other cases, fires or livestock grazing may accelerate the conversion of grassland to desert in response to a changing climate. For similar reasons, some forests may change to deserts or grassland.

Warmer and drier conditions make forests more susceptible to pests. Drought reduces the ability of trees to defend against attacks from pests such as bark beetles which have infested 100,000s of acres in California. Temperature controls the life cycle and winter mortality rates of many pests.

With higher winter temperatures, some pests can persist year-round, and new pests and diseases may become established.

Hot days can be unhealthy, even dangerous. Certain people are especially vulnerable, including children, the elderly, the sick, and the poor. High air temperatures can cause heat stroke and dehydration and affect people’s cardiovascular, respiratory, and n ervous systems. Higher temperatures are amplified in urban settings where paved and other surfaces tend to store heat.

Construction crews may have to increasingly operate on altered time schedules to avoid the heat of the day.

Rising temperatures can increase the formation of ground-level ozone, a key component of smog.

Ozone has various health effects, aggravates lung diseases such as asthma, and increases the risk of premature death from heart or lung disease. The U.S. EPA and the California Air Resources Board have been working to reduce ozone concentrations. As the climate changes, continued progress toward clean air will be more difficult.

Probability of Future Events
Climate change is an ongoing, long-term hazard. The effects of increased CO2 in the atmosphere will likely increase and persist for hundreds or thousands of years. It is likely (75% Chance) that Antioch will be affected by the result of climate change every year.

Regulatory Context
The State of California has stepped into a leadership role in planning for reducing greenhouse gas emissions and adapting to the potential impacts of climate change. Key laws, regulations, and policies helping to reduce Greenhouse Gas (GHG) emissions include:

The California Global Warming Solutions Act of 2006 (Assembly Bill [AB] 32 and Senate Bill [SB] 32)
AB 32 is the primary legislation that has driven GHG regulation and analysis in California between 2006 and 2016 by instructing the California Air Resource Board (CARB) to develop and enforce regulations for reporting and verifying statewide GHG emissions. The heart of the bill is the requirement that statewide GHG emissions be reduced to 1990 levels by 2020. Based on CARB’s calculations of emissions levels, California must reduce GHG emissions by approximately 15% below 2005 levels to achieve this goal. In September 2016, the Governor signed SB 32, which builds upon the statewide targets for 2020 by establishing a longer-term target so that “statewide CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 43 –
greenhouse gas emissions are reduced to 40% below the 1990 levels by 2030.” The bill further authorized CARB to adopt regulations to achieve the maximum technologically feasible and cost- effective greenhouse gas emissions reductions.

California Executive Orders S -3-05 (2005) and B -30-15 (2015) These two (2) executive orders highlight longer -term GHG emissions reduction targets for the state, though such targets have not yet been adopted by the legislature and signed into law.

Specifically, Executive Order (EO) S-3-05 seeks to achieve a reduction of GHG emissions of 80% below 1990 levels by 2050, consistent with the scientific consensus that developed regions will need to reduce emissions at least 80% below 1990 levels to limit global warming to 2.0°C.

Executive Order B-30-15 seeks to establish an interim target between the 2020 target established through AB 32 and the long-term targets in EO S-3-05, to achieve a reduction of GHG emissions of 40% below 1990 levels by 2030.

CEQA and Greenhouse Gas Emissions (Senate Bill 97)
In 2007, the Natural Resources Agency was directed by the legislature to prepare amendments to the California Environmental Quality Act (CEQA) Guidelines, providing direction to lead agencies on how to analyze and mitigate greenhouse gas emissions.

Senate Bill 379 (2015) Planning and Zoning Law
This legislation requires that the next revision of a
jurisdiction’s local hazard mitigation plan on or after January 1, 2017, or, if the local jurisdiction has not adopted a local hazard mitigation plan, beginning on or before
January 1, 2022, include a review and update of the safety element to address climate adaptation and resiliency
strategies applicable to that city or county. The bill would require the update to include a set of goals, policies, and objectives based on a vulnerability assessment, identifying the risks that climate change poses to the local jurisdiction and the geographic areas at risk from climate change
impacts.

California has also prepared programs and guidance for
local governments to consider in identifying hazards and adapting to a changing climate.

California Climate Adaptation Strategy
Executive Order S-13-08: In 2008, the Governor signed EO S-13-08, which directed the California Natural Resources Agency to lead a statewide effort to develop a climate adaptation strategy.

Published in 2009, the statewide plan describes climate trends and the potential impacts of climate change on key sectors, and it outlines short - and long-term actions that state and local governments can take to address future climate impacts.

California Adaptation Planning Guide (APG)

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 44 –
Published in 2012, this statewide resource serves as a guide to local governments to identify, evaluate, and plan for the range of unavoidable consequences their community may face in the future due to climate change. The APG includes a step -by-step proces s for conducting a vulnerability assessment and identifying potential adaptation strategies.

City Response to Climate Change
City of Antioch Climate Action and Resilience Plan
In response to Climate change the City developed a Climate Action and Resilience Plan which was adopted by City Council on May 12, 2020, in order to begin preparing the Antioch community for hazards shocks such as drought, flood, and extreme heat that are expected to intensify in the future and to reduce the community’s reliance on carbon-based energy sources.

The primary goal of the Climate Action and Resilience Plan is to provide tools for the City and the Antioch community to build community resilience to climate challenges. Actions that build resilience have benefits that fall into three (3) broad categories: adaptation to climate related changes, mitigation of greenhouse gas emissions, and community development for building strong communities that can withstand the climate challenge. Many proposed actions have multiple benefits and provide be nefits in more t han one (1) category. The image below summarizes these benefits. The Climate Action and Resilience Plan prioritizes actions that provide multiple benefits for the community.

4.5.2 AQUATIC INVASIVE SPECIES
Hazard Description
The City’s Public Works Department has identified several aquatic invasive species of concern, all of which are present in California:
o Animals – Nutria, Golden Mussel, Quagga mussel, Zebra mussel o Plants – Curly-leaf pondweed, Water hyacinth, Eurasian watermilfoil; Brazilian waterweed, Water primrose
Aquatic (water-dwelling) invasive species are non-native plants, animals, and other organisms that have evolved to live primarily in water (aquatic habitats) rather than on land (terrestrial habitats). Aquatic habitats are habitats that are covered with water all or part of every year. From oceans to bogs, many types of aquatic habitats exist.

Aquatic invasive plants include algae, floating plants, submersed plants, and emergent plants.

Aquatic invasive animals include insects, fish, reptiles, mollusks, crustaceans, and amphibians.

Other aquatic invasive organisms include pathogens (disease -causing organisms), such as molds, fungi, bacteria, and viruses. Aquatic invasive species cause tremendous harm to our environment, our economy, and our health. They can drive out and eat native plants and wildlife, spread diseases, and damage infrastructure. (Source: National Invasive Information Center Website)
Invasive aquatic plants include plants (members of the kingdom Plantae) and algae (primitive organisms that contain chlorophyll) that grow partially or entirely submerged in water. This CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 45 –
includes plants that are rooted in the sediment with part or all of the plant underwater, as well as plants that float freely without contacting the sediment (Anderson 2011; Smith 2011). Aquatic plants may invade both marine and freshwater environments, including habitats such as wetlands, lakes, rivers, estuaries, coastal zones, irrigation systems, hydroelectric systems, and aquaculture facilities. (Source: National Invasive Species Information Center Website) Aquatic invasive invertebrates are non-native animals that lack a vertebral column (backbone) and spend the majority of their lives in freshwater, marine, or estuarine environments (including inland waters, riparian areas, and wetlands). Crustaceans and mollusks are the most common invasive aquatic invertebrates found in the United States. (Source: National Invasive Species Information Website)
History
Aquatic invasive species have a long history of impacting ecosystems in California. These non - native species, including plants, animals, and pathogens, thrive in aquatic habitats and often outcompete native species, causing significant environmental, economic, and health -related challenges.

One notable example is the nutria, a large semi -aquatic rodent native to South America. Initially brought to the U.S. in 1889 for its fur, the nutria population surged after the collapse of the fur market in the 1940s. Thousands of these rodents either escaped or were released into the wild by ranchers, leading to widespread ecological disruption. While nutria are effective at consuming overabundant vegetation, their feeding habits also devastate native aquatic plants, crops, and wetlands.

Aquatic invasive species in California's waterways, lakes, ponds, and reservoirs have caused the destruction or eradication of native species, clogged waterways , and introduced pests or biological agents that contaminate freshwater supplies. This damage poses a threat not only to ecosystems but also to public health, as invasive species may clog potable water delivery infrastructure such as pipes and pumps.

Location
The Antioch Municipal Reservoir is a key component of the City’s water system, as the reservoir provides a means of equalizing demand and ensuring the reliability of the supply from the Contra Costa Canal. The Reservoir is home to most of the identified Aquatic Invasive Species.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 46 –

Figure 4-3: Antioch Reservoir
Extent
Aquatic invasive species are present in nearly every major watershed in California. The Sacramento–San Joaquin Delta, a critical hub for the state’s water supply, is especially impacted, with multiple invasive plants and animals established throughout the system.

Reservoirs in California have experienced rapid colonization by mussels, while rivers and streams statewide are vulnerable to invasive fish and invertebrates. The spread of AIS is facilitated by recreational boating, aquarium releases, and water transfers between regions.

The California Department of Fish and Wildlife has an Invasive Species Program that aims to reduce the negative effects of non -native invasive species on the wildlands and waterways of California.

Probability of Future Events
Aquatic invasive species are nearly impossible to eradicate. The City implements measures to reduce the population of invasive species to maintain water quality and public health . The City will continue to see impacts of invasive species for the foreseeable future. It is likely (75% Chance) that Antioch will be affected by the result of aquatic invasive species yearly.

Aquatic invasive species pose a significant risk to the facility, potentially rendering the water inaccessible or unsuitable for distribution for potable use. The effects of climate change pose a dual threat to the facility: periodic droughts may increase the demand for water from the reservoir,

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 47 –
and a warming climate may make the facility a more inviting habitat for invasive animal and plant species. It is likely that the protection of the reservoir from aquatic invasive species will involve continuing and possibly increased efforts over time.

Regulatory Environment
The California Department of Fish and Wildlife regulate s the management of aquatic invasive species. The California Aquatic Invasive Species Management Plan proposes management actions for addressing aquatic invasive species (AIS) threats to the State of California. It focuses on the non -native algae, crabs, clams, fish, plants and other species that continue to invade California’s creeks, wetlands, rivers, bays and coastal waters.

4.5.3 DAM FAILURE
Hazard Description
Dam Failure
Dams and reservoirs of jurisdictional size are defined in the California Water Code Sections 6000 through 6008. There are currently more than 1,400 dams of jurisdictional size in California.

Approximately 1,250 of these dams are under the jurisdiction of California’s Department of Water Resources, Division of Safety of Dams. Dams and reservoirs owned by the federal government are not subject to state jurisdiction except as otherwise provided by federal law. In California, there are currently 149 dams owned by federal government agencies such as the U.S. Forest Service, Bureau of Reclamation, Army Corps of Engineers, and the U.S. Military.

A dam failure is a sudden rapid and uncontrolled release of impounded water or liquid -borne solids from an impounding structure . The term “dam failure” encompasses a wide variety of circumstances. Situations that constitute a dam failure vary widely, from developing problems to a partial or catastrophic collapse of the entire dam. Potential causes of a dam failure are numerous and can be attributed to deficiencies in the original design of the dam, the quality of construction, the maintenance of the dam, op eration of the appurtenances and acts of nature including precipitation more than the design, flood, and damage from earthquakes.

Dam failures are most likely to happen for one (1) of five (5) reasons:

1. Water Overtopping: Overtopping will cause erosion of the dam crest and eventually dam breach.

2. Foundation Defects: Including settlement and slope instability, cause about 30% of all dam failures.

3. Cracking: Caused by movements like the natural settling of a dam.

4. Inadequate Maintenance and Upkeep: Especially important for older dams and those with previous impact due to hazards (e.g., seismic shaking).

5. Piping: Piping is a form of erosion that occurs underground caused by rodent burrowing and extensive root systems from vegetation growing on and around the dam.

Dam failure is potentially extremely dangerous if it occurs catastrophically with little or no warning.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 48 –
Dam inundation areas may contain large populations and significant critical infrastructure. During a catastrophic failure, the water flow may be dozens of feet high and move at high velocity. For large dams, evacuation procedures may not be adequate to prevent large loss of life and property damage.

Location
According to the National Inventory of Dams, there are 27 dams within Contra Costa County of which 23 are classified as high hazard dams. two of the 23 classified high hazard dams can impact the City in the event of a dam failure. Figure 4-7 provides the location and the inundation zone for the reservoirs that could result from failure of the reservoir dam.

Antioch Reservoir
Antioch Municipal Reservoir, National Inventory of Dams Nr. CA00057, was built in 1935 and contains 722-acre feet of water at full capacity. It is rated as an extremely high hazard dam by DWR. It is operated by the City of Antioch.

Upper Sand Creek Retention Basin
Upper Sand Creek Retention Basin, National Inventory of Dams Nr. CA01555 was constructed in 2014 and contains 895 acre feet of water at full capacity. It is rated as an extremely high hazard dam by DWR. It is operated by the Contra Costa County Flood Contr ol and Water Conservation District. Figure 4-7 on the next page provides the location and the inundation zone for the reservoir that could result from failure of the reservoir dam.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 49 –

Figure 4-4: Dam Inundation Areas
History
There are no previous dam failure events reported in Contra Costa County.

Extent
Dam Failure
The California Division of Safety of Dams (DSOD) uses a scale for defining the intensity or potential severity of dam failure solely based on potential downstream impacts to life and property.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 50 –
Additionally, the hazard is not related to the condition of the dam or its pertinent structures. This scale has four (4) categories which include the Federal categories and adds a fourth category of “extremely high”. Table 4 -6 outlines the downstream hazard potential classifications used by DSOD. Antioch Reservoir is rated as a High Hazard Dam with potential to cause the loss of at least one human life.

Table 4-6: California Department of Water Resources Division of Safety of Dams – Downstream Hazard Classifications
Downstream Hazard
Potential Classifications Potential Downstream Impacts on Life and Property Low No probable loss of human life and low economic and environmental losses. Losses are expected to be principally limited to the owner’s property.

Significant No probable loss of human life, but it can cause economic loss, environmental damage, impacts to critical facilities, or other significant impacts.

High Expected to cause the loss of at least one human life.

Extremely High Expected to cause loss of at least one human life and one of the following:
(A) Result in an inundation area with a population of 1,000 persons or more, or
(B) Result in the inundation of facilities or infrastructure, the inundation of which poses a significant threat to public safety as determined by the department on a case-by-case basis.

Probability of Future Event
Dam failure can result from numerous natural or human activities. Earthquakes, internal erosion, improper siting, structural and design flaws, or rising floodwaters can all result in the collapse or failure of a dam. A dam failure may also be a result of the age of the structure or inadequate spillway capacity. The probability of a future dam failure affecting the City is unknown. While possible, it is unlikely that a dam failure event will occur within the next 10 years. Event history is less than or equal to 10% likelihood per year.

Regulatory Context
In California, the regulation of dams is primarily overseen by DSOD under the Department of Water Resources. This division is responsible for the review, approval, and supervision of dam construction, maintenance, and safety protocols to prevent failure an d mitigate risks associated with dam operations.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 51 –
Impact of Climate Change
More frequent storms with greater durations and precipitation content may result from climate change. This increase has the potential to cause overtopping of a dams and resultant failure.

4.5.4 DROUGHT
Hazard Description
Drought is a normal part of virtually every climate on the planet, including areas of high and low rainfall. It is different from normal aridity, which is a permanent characteristic of the climate in areas of low rainfall. Drought is the result of a natura l decline in the expected precipitation over an extended period, typically one or more seasons in length. The severity of drought can be aggravated by other climatic factors, such as prolonged high winds and low relative humidity.

Drought is a complex natural hazard which is reflected in the following four (4) definitions commonly used to describe it:
• Meteorological drought is defined solely on the degree of dryness, expressed as a departure of actual precipitation from an expected average or normal amount based on monthly, seasonal, or annual time scales.
• Hydrological drought is related to the effects of precipitation shortfalls on stream-flows and reservoir, lake, and groundwater levels.
• Agricultural drought is defined principally in terms of naturally occurring soil moisture deficiencies relative to water demands of plant life, usually arid crops • Socioeconomic drought associates the supply and demand of economic goods or services with elements of meteorological, hydrologic, and agricultural drought.

Socioeconomic drought occurs when the demand for water exceeds the supply because of a weather- related supply shortfall. It may also be called a water management drought.

Drought severity depends on numerous factors, including duration, intensity, geographic extent, and regional water supply demands by humans and vegetation. Due to its multi -dimensional nature, drought is difficult to define in exact terms and also poses challenges in terms of comprehensive risk assessments.

Drought differs from other natural hazards in three (3) ways. First, the onset and end of a drought are difficult to determine due to the slow accumulation and lingering effects of an event after its apparent end. Second, the lack of an exact and universal ly accepted definition adds to the confusion of its existence and severity. Third, in contrast with other natural hazards, the impact of drought is less obvious and may be spread over a larger geographic area. These characteristics have hindered the preparation of drought contingency or mitigation plans by many governments.

Droughts may cause a shortage of water for human and industrial consumption, hydroelectric power, recreation, and navigation. Water quality may also decline, and the number and severity of wildfires may increase. Severe droughts may result in the loss of a gricultural crops and forest products, undernourished wildlife and livestock, lower land values, and higher unemployment.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 52 –
History
Droughts frequently occur in California. Recent periods of drought include:
• 1986–1992: California endured one of its most prolonged droughts ever, observed from late 1986 through late 1992. Drought worsened in 1988 as much of the U.S. also suffered from severe drought. In California, the six(6)-year drought ended in late 1992 as a significant El Niño event in the Pacific Ocean (and the eruption of Mount Pinatubo in June 1991) most likely caused unusual persistent heavy rains. • 2007–2009: Saw three (3) years of drought conditions, the 12th worst drought period in the state's history, and the first drought for which a statewide proclamation of emergency was issued. The drought of 2007 –2009 also saw greatly reduced water diversions from the state water project.
• 2011–2017: The period between late 2011 and 2014 was the driest in California history since record -keeping began. The drought led to Governor Jerry Brown instituting mandatory 25 % water restrictions in June 2015. Many millions of trees died from the drought – approximately 102 million, including 62 million in 2016 alone. By the end of 2016, 30% of California had emerged from the drought, mainly in the northern half of the state, while 40% of the state remained in the extreme or exceptional drought levels. • 2020–2023: The driest three(3)-year period in recorded California history, 1337 days, ended in October 2023. The year 2021 was the third driest every recorded for the state, resulting in emergency proclamations for the Russian, Scott, and Shasta river basins.

The following maps show the extent of drought conditions in California from February 2025, 2020 and 2015. They also include a chart showing the history of drought conditions in California from 2001 through early 2025.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 53 –

Figure 4-5: California Drought Monitor February 2025

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 54 –

Figure 4-6: California Drought Monitor February 2020

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 55 –

Figure 4-7: California Drought Monitor February 2015

Location
By definition, droughts are regional events. It is not possible for one area of the City to be under drought when another is not. Therefore, when a drought is declared, then the entire City is affected.

Extent
The National Integrated Drought Information System (NIDIS) Act of 2006 (Public Law 109 -430) prescribes an interagency approach for drought monitoring, forecasting, and early warning. The NIDIS maintains the U.S. Drought Portal, a centralized, web -based access point to several

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 56 –
drought-related resources, including the U.S. Drought Monitor (USDM) and the U.S. Seasonal Drought Outlook (USSDO).

The primary indicators for these maps for the Western U.S. are the Palmer Hydrologic Drought Index and the 60 -month Palmer Z -index. The Palmer Drought Severity Index (PSDI) is a commonly used index that measures the severity of drought for agriculture and water resource management. It is calculated from observed temperature and precipitation values and estimates soil moisture. However, the Palmer Index is not considered consistent enough to characterize the risk of drought on a nationwide basis. Commonly used drought severity classifications are depicted in Figure 4-8.

Figure 4-8: Commonly Used Drought Severity Classifications

Probability of Future Events
There is no commonly accepted return period or non-exceedance probability for defining the risk from drought (such as the 100-year or 1.0% annual chance of flooding). The magnitude of drought is usually measured in time and the severity of the hydrologic deficit. There are several resources available to evaluate drought status and even project expected conditions for the near future.

Drought conditions can be monitored on the NIDIS website. The probability that Antioch will experience the affects of Drought within the next year is likely (75% chance).

Regulatory Requirements
Federal, state, and local governments often implement various regulatory requirements to manage and mitigate the impacts of drought. These regulations can include water use restrictions,

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 57 –
mandates for water conservation practices, and requirements for drought contingency planning.

In accordance with the NIDIS Act of 2006, the NIDIS provides essential guidelines and resources for improving drought preparedness and resilience. Local governments are encou raged to develop drought response plans that identify critical water usage priorities, outline strategies to reduce water consumption, and establish protocols for public communication during drought emergencies.

Impact of Climate Change
Higher temperatures throughout the state will result in increasing droughts and are likely to affect the City. Annual precipitation has decreased in California during the last century, and it may continue to decrease. Soils are likely to be drier, and periods without rain are likely to become longer, making droughts more severe.

The changing climate is likely to increase the need for water but reduce the supply. Rising temperatures increase the rate at which water evaporates (or transpires) i nto the air from soils, plants, and surface waters. Irrigated farmland would thus need more water. But less water is likely to be available because precipitation is unlikely to increase enough to make up for the additional water lost to evaporation.

4.5.5 EARTHQUAKE
Hazard Description
An earthquake is the vibration of the earth’s surface following a release of energy in the earth’s crust. This energy can be generated by a sudden dislocation of the crust or by a volcanic eruption.

Most destructive quakes are caused by dislocations of the crust. The crust may first bend and then, when the stress exceeds the strength of the rocks, break and snap to a new position. In the process of breaking, vibrations called “seismic waves” are generated. These waves travel outward from the source of the earthquake at varying speeds.

The City is located in a high seismic risk zone. This region is one of the most seismically active in the world, marked by the number of large, damaging earthquakes that have occurred in the past.

The geologic sub-hazards described below are associated with earthquakes and may be caused by seismic activity, increasing the resulting damage.

Liquefaction (Secondary Hazard)
Soil liquefaction is a phenomenon in which soil's strength and stiffness are reduced by earthquake shaking or other rapid loadings. Liquefaction and related phenomena have been responsible for tremendous amounts of damage in historical earthquakes around the world. Liquefaction can result in the settling and compacting of unconsolidated sedim ent in the event of a major earthquake. Liquefaction may increase as the ground acceleration and duration of shaking due to an earthquake.

Locations of liquefaction in the City are shown in Figure 4-9.

Subsidence (Secondary Hazard)
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 58 –
Land subsidence is defined as the lowering of the land surface. Many different factors can cause the land surface to subside, such as a sinkhole or underground mine collapse, or during a major earthquake. Land subsidence can also occur when large amounts of groundwater have been excessively withdrawn from an aquifer. The clay layers within the aquifer compact and settle, resulting in lowering the ground surface in the area from which the groundwater is being pumped.

Over time, as more water is removed from the area, the ground drops and creates a cone. Once the water has been removed from the sediment, it cannot be replaced.

Land subsidence can occur in various ways during an earthquake. Movement that occurs along faults can be horizontal or vertical or have a component of both. As a result, a large area of land can subside drastically during an earthquake. Land subsidence can also be caused during liquefaction. Liquefaction can result in the settling and compacting of unconsolidated sediment in the event of a major earthquake. This can result in the lowering of the land surface.

Expansive Soils (Secondary Hazard)
Expansive soils contain mixed -layer clay minerals that increase and decrease in volume upon wetting and drying, respectively. Expansive soils are common throughout California and can damage foundations and slabs unless properly treated during construction. Expansive soils usually occur during an earthquake.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 59 –

Figure 4-9: Areas Subject to Liquefaction
History
California is one of the most seismically active areas in the U.S. The Northern California region has experienced at least nine (9) earthquakes of Magnitude 6.5 or higher since 1812.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 60 –
Table 4-8: Historical Earthquakes Recorded in Central California Date Magnitude Fault Name (Incident Name)
August 24, 2014 6.0 West Napa Fault (South Napa Earthquake) December 22, 2003 6.5 San Simeon Fault (San Simeon)
October 17, 1989 6.9 San Andreas Fault (Loma Prieta)
April 24, 1984 6.2 Calaveras Fault (Morgan Hill)
November 4, 1927 7.1 San Simeon-Hosgri Fault (Lompoc)
April 18, 1906 7.9 San Andreas Fault (San Francisco)
October 22, 1868 6.8 Hayward Fault (Hayward)

Location
The City is located in a seismically active area. The Alquist-Priolo Act requires that the California Geologic Survey identify faults in the state that may pose a risk of fault rupture. These faults, known as Alquist-Priolo faults, can create a significant ground-shaking event and include most of the major faults present in California. While there are no Alquist-Priolo faults within the City, there are many of these faults in the surrounding area. The most active strike-slip fault is the Hayward Fault, which has three fault segm ents (Rodgers Creek, North Hayward, and South Hayward).

Fault locations in the City are shown in Figure 4-10.

The following active faults, most of which are designated as Alquist -Priolo faults, are located within 60 miles of the community and are capable of producing significant earthquakes:
• San Andreas Fault: West of Antioch, the San Andreas Fault (the largest fault in California) is the major tectonic boundary between the Pacific and North American plates. The Pacific plate is moving northwest relative to North America while the North American plate is moving southward. The San Andreas Fault has a Maximum Earthquake Potential (MW) of 8.0.
• Hayward Fault: The Hayward Fault runs along the western portion of Contra Costa County and is divided into southern and northern segments. This Hayward Fault is considered to be the most likely source of the next major earthquake in the San Francisco Bay Area. The Hayward Fault was assigned a MW 6.9 for both the northern and southern segments.
• Rodgers Creek Fault: The Rodgers Creek Fault lies in the northern central portion of Contra Costa County and is a right -lateral strike-slip fault. The Rodgers Creek Fault has a predicted earthquake recurrence interval of 230 years with a MW 7.0. • Calaveras Fault: The Calaveras Fault represents a significant seismic source in the CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 61 –
southern and eastern San Francisco Bay region. It runs east of San Jose, and along the Pleasanton- Dublin-San Ramon urban corridor, including Highway 680. Seismologic evidence suggests that the southern and central sections of this fault may produce earthquakes as large as MW 6.2, while the northern section of the fault may produce earthquakes as large as MW 7.0.
• Concord-Green Valley Fault Zone : The Concord -Green Valley Fault is a right -lateral strike- slip fault zone that extends from the Walnut Creek area across Suisun Bay and continues to the north. The Concord fault extends approximately 12 miles, from the northern slopes of Mt. Diablo to Suisun Bay. North of Suisun Bay, the Green Valley fault continues to the north about 28 miles. It is estimated that the recurrence interval for these faults is approximately 180 years, and a rupture of both faults would produce a maximum earthquake of about MW 6.9.
• Greenville-Marsh Creek Fault: The Greenville-Marsh Creek Fault is a strike-slip fault of the San Andreas system extending from Bear Valley to the east side of Mount Diablo. It is estimated this fault has a maximum earthquake of MW 6.9 to the Greenville portion of the fault with a recurrence interval of about 550 years. • Pittsburg-Kirby Hills Fault: The Pittsburg-Kirby Hills fault extends some distance from the Kirby Hills north of the Sacramento River, to the eastern side of Mount Diablo, south of Pittsburg. The fault is believed to be a right -lateral strike-slip capable of generating a MW 6.5.
• Mount Diablo Thrust Fault: The Mount Diablo thrust fault is a northeast-dipping structure located beneath the Mount Diablo anticline. This blind thrust fault is considered capable of generating a maximum earthquake of MW 6.25.

Antioch has two (2) known, small earthquake faults within its boundaries as shown on the Figure 4-10. Due to the close proximity of several major faults, the entire City is equally subject to the earthquake hazard San Francisco Bay Area Major Seismic Faults. Figure 4-11 demonstrates the seismic shake potential given the proximity of the faults.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 62 –

Figure 4-10: Major Faults near the City

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 63 –
Extent
Two (2) scales are used to measure the severity and intensity of an earthquake. The Modified Mercalli Intensity (MMI) Scale measures the ground shaking intensity in terms of acceleration, velocity, and displacement. The Moment Magnitude (Mw) Scale measures the severity of the earthquake by the amount of energy released at the source of the earthquake. The Mw scale, based on the concept of seismic moment, is uniformly applicable to all sizes of earthquakes. The extent of damage from an earthquake is determined by the magnitude of the earthquake, distance from the epicenter, and characteristics of su rface geology. Table 4 -9 shows an approximate correlation between the Mw and the MMI Scale and its effects.

Table 4-9: Severity (Mw) and Intensity (MMI) Comparison Magnitude
(Mw)
MMI
Scale:

Intensity
Abbreviated MMI Scale: Effects

1.0 - 3.0 I I. Not felt except by a very few under especially favorable conditions.

3.0 - 3.9 II – III II. Felt only by a few persons
at rest, especially on upper
floors of buildings.

III. Felt quite noticeably by
persons indoors, especially on
upper floors of buildings. Many
people do not recognize it as an
earthquake. Standing motor cars
may rock slightly. Vibrations
similar to the passing of a truck.

Duration estimated.

4.0 - 4.9 IV – V IV. Felt indoors by many,
outdoors by few during the
day. At night, some
awakened. Dishes, windows,
doors disturbed; walls make
cracking sound—a sensation
like heavy truck striking
building. Standing motor cars
rocked noticeably.

V. Felt by nearly everyone; many
awakened. Some dishes, windows
broken. Unstable objects
overturned. Pendulum clocks may
stop.

5.0 - 5.9 VI – VII VI. Felt by all, many
frightened. Some heavy
furniture moved; a few
instances of fallen plaster—
damage slight.

VII. Damage negligible in buildings
of good design and construction;
slight to moderate in well-built
ordinary structures; considerable
damage in poorly built or badly
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 64 –
Table 4-9: Severity (Mw) and Intensity (MMI) Comparison Magnitude
(Mw)
MMI
Scale:

Intensity
Abbreviated MMI Scale: Effects
designed structures; some
chimneys broken.

6.0 - 6.9 VIII – IX VIII. Damage slight in
specially designed structures;
considerable damage in
ordinary substantial buildings
with partial collapse. Damage
great in poorly built
structures. Fall of chimneys,
factory stacks, columns,
monuments, walls. Heavy
furniture overturned.

IX. Damage considerable in
specially designed structures;
well-designed frame structures
thrown out of plumb. Damage
great in substantial buildings, with
partial collapse. Buildings shifted
off foundations.

7.0 and
higher
X - XI X. Some well-built wooden
structures destroyed; most
masonry and frame
structures destroyed with
foundations. Rails bent.

XI. Few, if any (masonry)
structures remain standing.

Bridges destroyed. Rails bent
greatly.

XII XII. Damage total. Lines of sight and level are distorted. Objects thrown into the air.

Source: U.S. Geological Survey (USGS): http://earthquake.usgs.gov/learn/topics/mag_vs_int.php

Probability of Future Events
Earthquake probabilities are calculated by projecting earthquake rates based on earthquake history and fault slip rates (not simply the number of occurrences within a span of years). The result is expressed as the probability that an earthquake of a specified magnitude will occur on a fault or within an area.

There is a strong likelihood that the City will experience a significant earthquake from one of the known major faults in the next 30 years. In 2017, the Working Group on California Earthquake Probabilities (WGCEP) issued its third Uniform California Earth quake Rupture Forecast (UCERF3) which determined the likelihood for magnitude 6.7 and larger earthquakes within the next 30 year, somewhere in the region remains near certainty (greater than 99%). Within the next 30 years, the probabilities of earthquakes in Northern California are:

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 65 –
• 72% that an earthquake measuring magnitude 6.7
• 51% that an earthquake measuring magnitude 7
• 20% that an earthquake measuring magnitude 7.5.

Regulatory Environment
The Alquist-Priolo Earthquake Fault Zoning Act was signed into California law on December 22, 1972, to mitigate the hazard of surface faulting to structures for human occupancy. The act in its current form has three (3) main provisions:
• It directs the state's California Geological Survey agency (then known as the California Division of Mines and Geology) to compile detailed maps of the surface traces of known active faults. These maps include both the best -known location where faults cut the surface and a buffer zone around the known trace(s).
• It requires property owners (or their real estate agents) to formally and legally disclose that their property lies within the zones defined on those maps before selling the property. • It prohibits new construction of houses within these zones unless a comprehensive geologic investigation shows that the fault does not pose a hazard to the proposed structure.

The Act was one of several that changed building codes and practices to improve earthquake safety. These changes are intended to reduce the damage from future earthquakes. The State provides extensive regulations on earthquake related issues. A key area fo r regulation is the California Building Standards Commission (CBSC). It is authorized by California Building Standards Law to administer the development, adoption, approval, publication, and implementation of California's building codes.

The California Building Standards Code, Title 24 serves as the basis for the design and construction of buildings in California. Improved safety, sustainability, maintaining consistency, new technology and construction methods, and reliability are paramoun t to the development of building codes. California’s building codes are published in their entirety every three (3) years.

Intervening Code Adoption Cycles produce supplement pages half -way (18 months) into each triennial period. Amendments to California’s building standards are subject to a lengthy and transparent public participation process throughout each code adoption cycle.

The California Seismic Safety Commission provides an array of regulatory and advisory information regarding seismic safety at: https://ssc.ca.gov/.

Impact of Climate Change
Climate change is not expected to have any direct influence on the likelihood, size, and/or severity of any future seismic-related event.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 66 –

Figure 4-11: Seismic Shake Map

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 67 –

4.5.6 SEVERE WEATHER (SEVERE WIND, EXTREME HEAT,

SEVERE RAINSTORM)
Severe Wind (Hazard Description)
Severe weather refers to any dangerous meteorological phenomena with the potential to cause damage, serious social disruption, or loss of human life. It includes thunderstorms, downbursts, tornadoes, waterspouts, snowstorms, ice storms, severe heat, and dust storms. Severe weather can be categorized into two groups: those that form over wide geographic areas are classified as general severe weather; those with a more limited geographic area are classified as localized severe weather. Severe weather, technically, is not the same as extreme weather, which refers to unusual weather events which are at the extremes of the historical distribution for a given area.

Several types of extreme weather events typically impact Contra Costa County: thunderstorms with damaging winds, tornados, extreme heat, and flooding. Tornados, damaging winds and severe heat occurring in Contra Costa County are described in detail in the following sections.

The Beaufort Wind Chart ( Table 4-11) provides terminology and a description of potential wind impacts at different levels.

The following types of damaging winds represent a hazard within the planning area:
• Downdrafts: A downdraft is a small -scale column of air that rapidly sinks toward the ground.
• Downbursts: A downburst is a strong downdraft with horizontal dimensions larger than

2.5 miles, resulting in an outward burst or damaging winds on or near the ground.

Downburst winds may sometimes produce damage similar to a strong tornado. Although usually associated with thunderstorms, downbursts can occur with showers too weak to produce thunder.
• Microbursts: Microbursts are small, concentrated downbursts that produce an outward burst of damaging winds at the surface. Microbursts are generally less than 2.5 miles across and short-lived, lasting only five (5) to 10 minutes, with maximum wind speeds up to 168 mph.
• Tornados: Tornados are formed by the turbulent mixing of layers of air with contrasting temperature, moisture, density, and wind flow. Tornados have occurred in the planning area but are not common.

Severe wind can result in collapsed or damaged buildings, damaged or blocked roads and bridges, damaged traffic signals, streetlights, and parks, and other damage. Wind speeds as low as 32 mph can cause structural damage, and winds of 100 mph can destroy wood -frame structures. They can also cause direct losses to buildings, people, and vital equipment. There are direct consequences to the local economy resulting from windstorms and the associated physical damage and interrupted services.

Extreme Heat (Hazard Description)
According to the National Weather Service (NWS), extreme heat occurs when the temperature CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 68 –
reaches high levels or when the combination of heat and humidity causes the air to become oppressive and stifling. The NWS will issue advisories or warnings when the heat index is expected to have a significant impact on public safety.

Severe Rainstorm (Hazard Description)
During severe rainstorm events can fall at such a high rate that it cannot drain away fast enough.

The resulting heavy rain can cause flooding, leading to inundation and potential damage to buildings, road networks, public areas, utilities, and other criti cal pieces of infrastructure. In California, heavy rainfall events are often short, intense bursts of rain, but in some cases, heavy rain can persist for multiple days.

History
Table 4-10 summarizes search results from the National Center for Environmental Information Storm Events Database for Contra Costa County storm events over the 20-year period from 2002 through 2025. Based on these results, wind events are likely to happen every year , significant heat events occur multiple times a year.

Table 4-10: Contra Costa County Severe Weather Events (2020-2025) Event Types Include Total Number of Events
Severe Winds 272
Extreme Heat 6
Severe Rainstorms 5

Location
Severe weather events have the potential to happen anywhere in the planning area. Wind events are most damaging to areas where trees and power lines can be knocked down. Extreme heat events may be exacerbated in the City where reduced air flow, reduced veg etation, and temperatures that are several degrees higher than in surrounding less urbanized areas.

Additionally, Extreme Heat can lead to loss of power in the planning area. Severe Rainstorms can impact the entire planning area, bringing heavy rain which can cause localized flooding.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 69 –

Figure 4-12: Scores on Heat Vulnerability Indicators
Extent
Severe Winds
Generally, winds are measured using the Beaufort scale, developed in 1805, which categorizes wind events on a force scale from “0” to “12: using their speed and impacts. Any wind classified as force nine (9) or above is generally considered a severe wind event. Table 4-11 identifies the Beaufort scale, which classifies wind events in detail . The City of Antioch has experienced category “9” winds but has the potential to experience category “11” winds.

Table 4-11: Beaufort Scale
Force Speed (mph) Description
0 0 to 1 Calm: Smoke rises vertically
1 1 to 3 Light air: The direction of the wind is shown by smoke drift but not wind vanes.
2 4 to 7 Light breeze: Wind is felt on the face, leaves rustle, and wind vanes are moved.
3 8 to 12 Gentle breeze: Leaves and small twigs are in motion, and light flags are extended.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 70 –
Table 4-11: Beaufort Scale
Force Speed (mph) Description
4 13 to 18 Moderate breeze: Dust and loose paper become airborne, and small branches are moved.
5 19 to 24 Fresh breeze: Small trees begin to sway
6 25 to 31 Strong breeze: Large branches are in motion, and using an umbrella becomes difficult.
7 32 to 38 High wind: Whole trees are in motion and walking against the wind can be hard.
8 39 to 46 Strong wind: Walking is difficult, and twigs break off trees. 9 47 to 54 Severe wind: Slight structural damage.
10 55 to 63 Storm: Trees are uprooted and considerable damage to structures. 11 63 to 72 Violent storm: Widespread damage.
12 73 and above Hurricane: Devastating damage.

Extreme Heat :

Excessive Heat Outlook occurs when the potential exists for an excessive-heat event in the next three to seven days. The NWS will provide an indication of areas where people and animals may need to take precautions. The outlook is based on a combination of temperature and humidity, Heat Index, over a certain number of days. An outlook is used to indicate that a heat event may develop. It is intended to provide information to those who need lead time to prepare for the event, such as public utilities, emergency management personnel, and public health officials.

Excessive Heat Outlook occurs when the potential exists for an excessive-heat event in the next three (3) to seven (7) days. The NWS will provide an indication of areas where people and animals may need to take precautions. The outlook is based on a combination of temperature and humidity, Heat Index, over a certain number of days. An outlook is used to indicate that a he at event may develop. It is intended to provide information to those who need lead time to prepare for the event, such as public utilities , emergency management personnel, and public health officials. The City of Antioch has experienced Heat Advisories but has the potential to experience Excessive Heat Watches do to climate change.

Table 4-12 provides a description of heat-related public notifications.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 71 –
Table 4-12: Heat-Related Public Notifications
Heat Advisories The Heat Index has to remain at or above 100°F for a minimum of two (2) hours. Heat advisories are issued by zone when any location within that zone is expected to reach criteria. For example: If you expected the heat index to reach 100°F in Visalia, a heat advisory would be issued for that county.

A heat advisory means that people can be affected by heat if precautions are not taken. The issuance of a heat advisory is important to raise public awareness that these precautions need to be taken. Heat advisories are also used to trigger other actions and regulations such as no evictions, no turning off of power, changing outdoor work requirements, etc.

Excessive Heat
Watches
Issued when Heat Warning criteria is possible (50-79%) one (1) to two (2) days in advance.

Excessive Heat
Warnings
Criteria for an Excessive Heat Warning is a Heat Index of 105°F or greater that will last for two (2) hours or more. Heat Warnings are issued by zone when any location within that zone is expected to reach criteria.

For example: If you expected the Heat Index to reach 105°F in Visalia an Excessive Heat Warning would be issued for that zone.

A heat warning means that some people can be seriously affected by heat if precautions are not taken. Studies in Canada, Europe, and the U.S. have indicated that mortality begins to increase exponentially as the heat increases or stays above a Heat Index of 104°F.

Note: In addition to raising public awareness, the issuance of a heat warning will alert hospitals and officials to take certain actions to prepare and respond to an increase in emergency calls and activate programs to check on elderly and the home-bound. In some cases, cooling centers can be open or designated and donation programs activated for fans and air conditioners. As in the case of an advisory, certain regulations may change such as turning off people's electricity, evictions, and outside work requirements.

Severe Rainstorm
California’s precipitation varies from year to year, depending on how much moisture the state receives from atmospheric rivers. Atmospheric rivers are corridors along which wet air travels from the tropics to continents. When the moisture arrives in Califo rnia, it may precipitate as rain or snow. One of California's most known atmospheric rivers is the “Pineapple Express,” which brings moist air from the ocean surrounding Hawaii to California. An immense amount of moisture may be transported along the atmospheric rivers that cross over California during certain years, leading to severe rains.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 72 –
Another weather phenomenon influencing rainfall in Northern California is “El Niño,” officially referred to as the “Southern Oscillation” or “El Niño -Southern Oscillation (ENSO).” ENSO can cause increased rainfall, particularly during the winter months, caused by warming of the surface of the eastern tropical Paci fic Ocean, leading to the evaporation of warm, moist air into the atmosphere. Winds bring this moisture to the eastern Pacific and the American continents, where it falls as rain. ENSO does not alw ays lead to increased rainfall by default, but in general, it can increase the chances of winter with higher -than-usual precipitation. The City of Antioch experiences Heavy Rain Annually but has the potential to experience Heavy Showers.

Rain events are usually measured by the amount of precipitation that falls. Table 4-13 categorizes rain events by the amount of precipitation per hour.

Table 4-13: Measuring Heavy Rain Events
Rain Type Description
Heavy Rain More than 4 mm per hour but less than 8 mm per hour Very Heavy Rain Greater than 8 mm per hour
Moderate Shower Greater than 2 mm, but less than 10 mm per hour Heavy Shower Greater than 10 mm per hour, but less than 50 mm per hour Violent Shower Greater than 50 mm per hour

Probability of Future Events:

Based on history, severe weather events, including Santa Ana winds or microburst tornadic activity can be expected, perhaps annually, across widespread areas of Contra Costa County. In the U.S., average surface temperatures have risen more quickly since th e late 1970s (0.36ºF to

0.55ºF per decade), with seven (7) of the top 10 warmest years on record since 1998. This will lead to more days of extreme heat every year.

There is no indication that rainfall or severe rain hazards will abate either in Antioch or the greater region of Northen California in the future. While Antioch may experience prolonged periods of dry or wet years, all expectations are that the probability Antioch will experience a Severe Wind, Severe Rainstorm, and/or Extreme Heat in the next year is likely (75% Chance) and is anticipated to increase in the future.

Impact of Climate Change
Climate change is a key driver of severe weather events. Climate change has led to an increase in the earth’s surface temperature which has caused hotter days and warmer nights. Winter storms have the possibility of becoming more frequent with the climate temperatures increasing, and the atmosphere becoming more convective.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 73 –

4.5. 7 FLOODING
Hazard Description
Rain that falls in the Central Valley of California and in most of the Sierra Nevada Mountains ultimately flows to the Pacific Ocean through the San Joaquin-Sacramento River Delta along the water’s edge of Antioch and the shoreline of Contra Costa County. The shoreline of Antioch is within the 100 -year flood zone which may cause localized flooding in and around watershed areas. This threat has been mitigated in some degree by improvements in the water runoff infrastructure within the City.

A flood occurs when the existing channel of a stream, river, canyon, or other watercourse cannot contain excess runoff from rainfall or snowmelt, resulting in overflow onto adjacent lands. A floodplain is the area adjacent to a watercourse or other body of water that is subject to recurring floods. Floodplains may change over time from natural processes, changes in the characteristics of a watershed, or human activity such as construction of bridges or channels. River channels change as water moves downstre am, acting on the channel banks and on the channel bottom.

On the outside of a channel curve, the banks are subject to erosion as the water scours against them. On the inside of a channel curve, the banks receive deposits of sand and sediment transferred from the eroded sites. In areas where flow contains a high-sediment load, the course of a river or stream may shift dramatically during a single flood event.

There are two (2) major types of flooding within the City: coastal flooding and urban flooding. Both are described below.

Urban Flooding
Urban flooding results in the inundation of property in a built environment, particularly in more densely populated areas, caused by rain falling on increased amounts of impervious surfaces and overwhelming the capacity of drainage systems. Although someti mes triggered by events such as flash flooding or snowmelt, urban flooding is a condition, characterized by its repetitive and systemic impacts on communities, that can happen regardless of whether or not affected communities are located within designated floodplains or near any body of water. For this HMP, flash flooding is considered as a potential cause of localized flooding and there are no specific mitigation actions within the mitigation strategy.

Coastal Flooding
Coastal flooding occurs when normally dry, low-lying coastal land is inundated by seawater. The primary causes of coastal flooding include storm surges, high tides, and heavy rainfall events that coincide with these conditions. Additionally, climate change and the subsequent rise in sea levels exacerbate the frequency and intensity of coastal flooding events. In urban areas like Antioch, coastal flooding can lead to extensive property damage, erosion of shorelines, and disruptions to infrastructure and daily life.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 74 –

History
Flooding associated with severe storms has been among the most common disaster in the Bay Area during the period from 1950 to 2015, occurring on average 1.3 times a year over the past 60 years. Often heavy rainfall brings many areas of localized flooding, especially in low -lying areas of the region. Other significant floods have occurred during this time period. Extensive flooding occurred in 1950, 1957, 1958, 1959, 1962, 1964, 1965, 1966, 1969, 1970, 1973,1980, 1982, 1983, 1992, 1995, 1996, 1997, 1998, 2005, 2006, and 2008, 2009, 2012, 2014, and 2017.

Antioch has experienced five (5) significant floods. Of these floods, zero (0) received a State or Presidential Disaster Declarations. Table 4 -13 lists these notable floods, detailing the dates, names, affected acres, and the number of deaths or lost structures associated with each event.

This historical record underscores the persistent threat of flooding in the region and the importance of ongoing flood management and preparedness measures.

Table 4-13: Significant Flooding Events in Antioch
Event Type Date Damage
Flood January 2023 Significant flooding and landslides caused damage to some of our creeks and out-fall to the river at Fulton
Shipyard Road.

Flood February 2017 No estimates are available. Flooding resulted in road closures, downed trees and flooding to some residents.

Flood October 2009 No estimates are available. Flooding resulted in road closures, downed trees and flooding to some residents.

Flood January 2006 Damage totaling $66,912. Citywide cleanup in four (4) locations.

Flood February 1998 Damage totaling $189,475. Citywide cleanup in seven (7) locations.

Location
Low lying areas are subject to flood conditions. Urban development in flood plain areas is often subject to seasonal inundation. The flood plain is a natural extension of any waterway, although infrequently used. Storm water runoff, when exceeding the capa bilities of physical channel characteristics of a stream, results in the natural flooding of a localized area, inundating vehicles and causing considerable damage to residential and industrial properties located near stream and drainage channels.

Figure 4-13 shows the FEMA flood zones for the City per the area’s Flood Insurance Rate Map CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 75 –
(FIRM).

Figure 4-13: City Flood Zones

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 76 –

Extent
The magnitude of flooding that is used as the standard for floodplain management in the U.S. is a flood with a probability of occurrence of 1.0% in any given year. This flood is also known as the 100-year flood or base flood. The most readily available source of information regarding the 100- year flood, as well as the 500-year flood (0.2% probability of occurrence in any given year), is the system of FIRMs prepared by FEMA. These maps are used to support the NFIP.

The U.S. Geological Survey (USGS) and other agencies refer to the percent chance of occurrence as an Annual Exceedance Probability (AEP). An AEP is always a fraction of one. A 0.2 AEP flood has a 20% chance of occurring in any given year, and this corresponds to a five (5)-year recurrence-interval flood. Recurrence-interval terminology tends to be more understandable for flood intensity comparisons but may be misleading since a 100 -year flood could occur two (2) years in a row.

Like many cities, Antioch has areas that are subject to flooding. FEMA provides detailed maps and categories to help communities understand and manage their flood risk. These floodplain designations are crucial for City planning, construction, insurance, and emergency preparedness.

Table 4-14 shows these detailed floodplain categories. FEMA classifies Antioch under two (2) floodplain category: X and AE, the location of these floodplains can be seen on the FEMA Flood Hazard Zone Maps.

Table 4-14: FEMA Floodplain Categories
Category Description
A Within a 100-year floodplain, but the water height of the 100-year flood is not known.

A1-30 or AE Within a 100-year floodplain and the water height of the 100-year flood is known.

AO Within a 100-year floodplain, and the water height of the 100-year flood is between one and three feet (3 ft.) but not specifically known.

A99 Within a 100-year floodplain, it is protected by flood protection infrastructures such as dams or levees.

AH Within a 100-year floodplain, and the water height of the 100-year flood is between one and three feet (3 ft.) and is specifically known.

AR Within a 100-year floodplain, it is protected by flood protection infrastructure that is not currently effective but is being rebuilt to provide protection.

V Within a 100-year floodplain for coastal floods, but the height of the flood is not known.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 77 –
Table 4-14: FEMA Floodplain Categories
Category Description
V1-30 or VE Within a 100-year floodplain for coastal floods and the water height of the flood is known.

VO Within a 100-year floodplain for shallow coastal floods with a height between one and three feet (3 ft.).

B Within a 500-year floodplain, or within a 100-year floodplain with a water height less than one foot (found on older maps).

C Outside of the 500-year floodplain (found on older maps).

X Outside of the 500-year floodplain (found on newer maps).

X500 Within a 500-year floodplain or within a 100-year floodplain with a water height less than one foot (found on newer maps).

D Within an area with a potential and undetermined flood hazard.

M Within an area at risk of mudslides from a 100-year flood event.

N Within an area at risk of mudslides from a 500-year flood event.

P Within an area at risk of mudslides from a potential and undetermined flood event.

E Within an area at risk of erosion from a 100-year flood event.

Repetitive Loss
A repetitive loss property is defined by FEMA as an NFIP-insured property that has experienced any of the following since 1978, regardless of any changes in ownership:
• Four or more paid losses in excess of $1,000
• Two (2) paid losses in excess of $1,000 within any rolling 10-year period • Three or more paid losses that equal or exceed the current value of the insured property.

Repetitive loss properties make up only 1.0% to 2.0% of flood insurance policies in force nationally, yet they account for 40 % of the nation’s flood insurance claim payments. In 1998, FEMA reported that the NFIP’s 75,000 repetitive loss structures have already cost $2.8 billion in flood insurance payments and that numerous other flood-prone structures remain in the floodplain at high risk. The government has instituted programs encouraging communities to identify and mitigate the causes of repetitive losses . A recent report on repetitive losses by the National Wildlife Federation found that 20 % of these properties are outside any mapped 100 -year floodplain.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 78 –
The key identifiers for repetitive loss properties are the existence of flood insurance policies and claims paid by the policies. FEMA-sponsored programs, such as the Community Rating System (CRS), require participating communities to identify repetitive loss areas. A repetitive loss area is the portion of a floodplain holding structures that FEMA has identified as meeting the definition of repetitive loss. Identifying repetitive loss areas helps to identify structures that are at risk but are not on FEMA’s list of repetitive loss structures because no flood insurance policy was in force at the time of loss. The following map shows the repetitive loss areas in Contra Costa County. There are no repetitive loss properties in Antioch. Figure 4-14 displays repetitive loss areas for Contra Costa County.

Figure 4-14: Repetitive Loss Areas in Contra Costa County

Probability of Future Events
The major causes of flooding in the City are short-duration, high-intensity storms. Water courses in the City can flood in response to a succession of intense winter rainstorms, usually between early November and late March. A series of such weather events can cause severe flooding in the City due to the large percentage of impervious area and the age and capacity of the drainage system. A worst-case scenario is a series of storms that flood numerous drainage basins in a short time, such as those projected by USGS in the CA ARkStorm Scenario (USGS 2018). This could overwhelm response and floodplain management capabilities within the City. Major roads could be blocked, preventing critical access for many residents and critical functions. Additionally, as the grounds become saturated, groundwater flooding issues typical for the City would be significantly enhanced. Due to its low impacts that flooding has in the City, unlikely (25% chance) that severe flooding will impact the City within the next year.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 79 –
Impact of Climate Change
Climate change acts as an amplifier of existing flood hazards. Extreme weather events have become more frequent over the past 40 to 50 years and this trend is projected to continue. Rising sea levels and shifting weather patterns (temperature, winds) are e xpected to have a significant impact on rainfall frequency, intensity and distribution, which in turn will have a significant impact on the frequency of flood occurrences.

Climate Change can also increase the frequency and/or intensity of mudflows. Changes in precipitation, specifically the increased frequency of intense precipitation, can result in a water content the ground cannot tolerate, and may cause mudflows. These mudflows may happen more frequently due to the increased number of heavy rainfall events.

4.5. 8 FIRE
Hazard Description
Wildfire
As defined in the California Fire Protection (CAL FIRE) 2010 Strategic Fire Plan, a wildfire event is an unwanted wildland fire including unauthorized human -caused fires, escaped wildfire use events, escaped prescribed wildfire projects, and all other wildfires.

Wildfire is a significant and recurrent threat in the City service area and has the potential to destroy buildings, cause damage to vital infrastructure, injure people, and can result in loss of life, agricultural land, and animals. Wildfire season commences in early spring through late fall every year during the hotter, dryer months. Highly flammable vegetation and warm, dry summers create the potential for wildland fires in Antioch.

The risk of wildland fires is related to a combination of factors, including winds, temperatures, humidity levels, and fuel moisture content. Of these four (4) factors, wind is the most crucial. Steep slopes also contribute to fire hazards by intensifying the effects of wind and making fire suppression difficult. Where there is easy public access to dry vegetation, fire hazards increase due to greater chance of human carelessness. High hazard areas include outlying residential parcels and open lands adjacen t to residential areas. Such development has also moved the urban wildland interface (the area where human development meets undeveloped wildland) closer to higher-risk, wildfire hazard areas, increasing the number of people and buildings at risk as illustrated in Figure 4-15.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 80 –

Figure 4-15: City of Antioch Fire Hazard Severity Zones

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 81 –
Wildland Urban Interface Fire (WUI )
A WUI fire includes situations in which a wildland fire enters an area that is developed with structures and other human developments. In WUI fires, the fire is fueled by both naturally occurring vegetation and the urban structural elements themselves. According to the National Fire Plan issued by the U.S. Departments of Agriculture and Interior, the wildland -urban interface is defined as “…the line, area, or zone where structures and other human development meet or intermingle with undeveloped wildland or vegetative fuels.” The WUI fire can be subdivided into three (3) categories (NWUIFPP, 1998): 1) classic wildland - urban interface; 2) the mixed wildland -urban interface; and 3) the occluded wildland -urban interface. The classic wildland -urban interface exists where well -defined urban and suburban development presses up against open expanses of wildland areas. The mixed wildland -urban interface is characterized by isolated homes, subdivisions, and small communities situated predominantly in wildland settings. The occluding wildland-urban interface exists where islands of wildland vegetation occur inside a largely urbanized area. Generally, many of the areas at risk within the City fall into the classic wildland-urban interface category.

Certain conditions must be present for a wildfire hazard to occur; a large source of fuel must be present, the weather must be conducive (generally hot, dry, and windy), and fire suppression sources must not be able to easily suppress and control the fire. The cause of the majority of wildfires is human-induced or lightning; however, once burning, wildfire behavior is based on three (3) primary factors: 1) fuel; 2) topography; and 3) weather. Fuel will affect the potential size and behavior of a wildfire depending on the amount present, its burning qualities (e.g. level of moisture), and its horizontal and vertical continuity.

Topography affects the movement of air, and thus the fire, over the ground surface. The terrain can also change the speed at which the fire travels, and the ability of firefighters to reach and extinguish the fire. Weather as manifested in temperature, humidity and wind (both short and long term) affect the probability, severity, and duration of wildfires. Other factors that create concern are drought conditions and the built environment.

Drought conditions bring on contributing concerns in that it can lead to relatively drier conditions and leave reservoirs and water tables lower; thus, creating hotter fires and less water to fight the fires. The expansion of the built environment into previously unoccupied areas introduces more people to the hazard and in some cases make response actions more challenging.

Urban Fire
An urban fire is a significant fire event that occurs within a city or densely populated area. These fires typically involve residential, commercial, or industrial buildings and often spread rapidly due to the close proximity of structures, the presence of combustible materials, and the high density of people and infrastructure.

History
Over the past 2 years, Antioch has experienced 5 small wildfires that have totaled approximately 320 acres and one injury. Although there have been no major fires that have impacted Anti och, CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 82 –
the City remains vulnerable like much of Contra Costa County. Below is a list of major wildfires in Contra Costa County from 2018-2022.

Table 4-15: Major Wildfires in Contra Costa County 2018 - 2022 Location
County/
Zone
State
Date
Time
Type
Death
Injury
Property
Damage
Crop
Damage

EAST BAY

INTERIOR

VALLEYS
(ZONE)
East Bay
Interior
Valleys
CA 5/20/2022 11:00 Wildfire 0 0 0.00K 0.00K

EAST BAY

INTERIOR

VALLEYS
(ZONE)
East Bay
Interior
Valleys
CA 7/11/2021 08:22 Wildfire 0 0 0.00K 0.00K

EAST BAY

HILLS AND
THE
DIABLO
RANGE
(ZONE)
East Bay
Hills And
The Diablo
Range
CA 9/1/2020 00:00 Wildfire 0 0 0.00K 0.00K

EAST BAY

HILLS AND
THE
DIABLO
RANGE
(ZONE)
East Bay
Hills And
The Diablo
Range
CA 8/16/2020 04:00 Wildfire 0 6 0.00K 0.00K

EAST BAY

INTERIOR

VALLEYS
(ZONE)
East Bay
Interior
Valleys
CA 7/20/2020 13:15 Wildfire 0 0 0.00K 0.00K

EAST BAY

INTERIOR

VALLEYS
(ZONE)
East Bay
Interior
Valleys
CA 7/6/2020 13:00 Wildfire 0 0 0.00K 0.00K

EAST BAY
HILLS

AND THE
DIABLO
RANGE
(ZONE)
East Bay
Hills
And The
Diablo
Range

7/4/2020

12:28

Wildfire

0 0

0.00K

EAST BAY

INTERIOR

VALLEYS
(ZONE)
East Bay
Interior
Valleys

6/6/2020

16:00

Wildfire

0 0

0.00K

0.00K
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 83 –
Table 4-15: Major Wildfires in Contra Costa County 2018 - 2022 Location
County/
Zone
State
Date
Time
Type
Death
Injury
Property
Damage
Crop
Damage

EAST BAY

INTERIOR

VALLEYS
(ZONE)
East Bay
Interior
Valleys
CA 10/27/2019 07:50 Wildfire 0 0 0.00K 0.00K

EAST BAY

INTERIOR

VALLEYS
(ZONE)
East Bay
Interior
Valleys
CA 10/27/2019 10:30 Wildfire 0 0 0.00K 0.00K

EAST BAY

INTERIOR

VALLEYS
(ZONE)
East Bay
Interior
Valleys
CA 10/27/2019 13:00 Wildfire 0 0 0.00K 0.00K
SAN

FRANCISCO
BAY

SHORELINE
(ZONE)
San
Francisco
Bay
Shoreline

10/27/2019

13:45

Wildfire

0 0

0.00K

EAST BAY

INTERIOR

VALLEYS
(ZONE)
East Bay
Interior
Valleys

10/27/2019

15:00

Wildfire

0 0

0.00K

EAST BAY

HILLS AND
THE
DIABLO
RANGE
(ZONE)
East Bay
Hills And
The Diablo
Range

10/24/2019

20:40

Wildfire

0 0

0.00K

EAST BAY

INTERIOR

VALLEYS
(ZONE)
East Bay
Interior
Valleys
CA 10/10/2019 00:00 Wildfire 0 0 0.00K 0.00K

EAST BAY

INTERIOR

VALLEYS
(ZONE)
East Bay
Interior
Valleys
CA 8/7/2019 12:00 Wildfire 0 0 5.00K 0.00K
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 84 –
Table 4-15: Major Wildfires in Contra Costa County 2018 - 2022 Location
County/
Zone
State
Date
Time
Type
Death
Injury
Property
Damage
Crop
Damage

EAST BAY

HILLS AND
THE
DIABLO
RANGE
(ZONE)
East Bay
Hills And
The
Diablo
Range
CA 6/11/2019 11:34 Wildfire 0 0 5.00K 0.00K

Location
The wildland-urban interface within and bordering southern and southeastern areas of the City poses the greatest threat of wildfires. The area is primarily uninhabited foothills adjacent to densely populated residential areas. Vegetation in the foothills becomes very dry during summers, especially under drought conditions, making the area conductive to periodic wildfire events.

Urban fires are a constant threat in the entire City. Recent urban fires occurred on February 24, 2025, when two (2) tractor trailers burned in the 200 block of Depot Street; and a fire at a strip mall at Sycamore Drive and Auto Center Drive.

Extent
The State Fire Marshal classifies wildfire hazard lands within state responsibility areas into fire hazard severity zones. Each zone shall embrace relatively homogeneous lands and shall be based on fuel loading, slope, fire weather, and other relevant fact ors present, including areas where winds have been identified by the department as a major cause of wildfire spread. The State Fire Marshal shall identify areas in the state as moderate, high, and very high fire hazard severity zones based on consistent statewide criteria and based on the severity of fire hazard that is expected to prevail in those areas. Moderate, high, and very high fire hazard severity zones shall be based on fuel loading, slope, fire weather, and other relevant factors including areas where winds have been identified by the Office of the State Fire Marshal as a major cause of wildfire spread.

Probability of Future Occurrence
Fires will continue to occur on an annual basis in the City. The size and intensity of future fires and the impacts on City operations are difficult to predict. There is a 60% chance that wildfires will impact the City within the next year.

Impact of Climate Change
Climate change and the associated warmer weather, reduced snowpack, and earlier snowmelt can be expected to increase wildfire risk through fuel hazards and ignition risks. These changes CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 85 –
can also increase plant moisture stress and insect populations, both of which affect forest health and reduce forest resilience to wildfires. An increase in wildfire intensity and extent will increase public safety risks, property damage, fire suppression and emergency response costs to government, watershed and water quality impacts, vegetation conversions and habitat fragmentation.

4.5. 9 HUMAN -CAUSED HAZARDS
Cyber Security Threats
Hazard Description
Cyberterrorism and cyberattacks are terms for cybersecurity threats that are often used interchangeably, though they are not the same. All cyberterrorism is a form of cyberattack, but not all cyberattacks are cyberterrorism.

Public and private computer systems can experience a variety of cyberattacks, from blanket malware infection to targeted attacks on system capabilities. Cyberattacks specifically seek to breach information technology security measures designed to protect a n individual or organization. The initial attack is followed by more severe attacks to cause harm, steal data, or ransom the impacted system. Organizations are prone to different types of attacks that can be automated or targeted.

Any facility that relies on computers, computer systems and programs for their operations could be a target. Generally, attacks last minutes to days, but large-scale events and their impacts can last much longer. As information technology continues to grow in capability and interconnectivity, cyber threats become increasingly frequent and destructive. Cyber threats differ by motive, attack type and perpetrator profile. Motives range from the pursuit of financial gain to political or social aims. Cyber threats are difficult to identify and comprehend.

Types of threats include using viruses to erase entire systems, breaking into systems and altering files, using someone’s personal computer to attack others, or stealing confidential information.

The spectrum of cyber risks is limitless, with threats havin g a wide range of effects on the individual, community, organizational, and national level.

Ransomware
The Federal Bureau of Investigation (FBI) defines ransomware as a type of malicious software, or malware, which prevents you from accessing your computer files, systems, or networks and demands you pay a ransom for their return. Businesses should have a business continuity plan in case of a ransomware attack.

Cyberterrorism
The FBI is the lead federal agency for investigating cyberterrorism. In order for a cyberattack to be considered terrorism, the attack must be premeditated and politically motivated against information, computer systems, computer programs, or data. “Cyberterrorism may be carried out by state and non -state actors which have the capability to steal, alter, or destroy the nations sensitive data and, in the worst of cases, to manipulate from afar the process control systems that are meant to ensure the proper functioning of portions of the nations’ critical infrastructure” (FBI, CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 86 –
The Cyber Threat and the FBI’s Cyber Program). Critical infrastructure and the nation are becoming more vulnerable to cyberattacks as their dependency on computer networks and systems grows.

History
Cyberattacks on U.S. companies occur daily, and the quantity and quality of information being hacked, stolen, destroyed, or leaked is becoming an increasing problem for consumers, government entities, and businesses.

The following list is of recent cyber-attacks that affected government agencies in California:
• February 2024 – The City of Oakley suffered an attack on the City’s I nformation Technology systems. The City Manager proclaimed a state of emergency as a precautionary measure.
• February 2024 – The City of Pleasant Hill detected unauthorized activity on their network by an unauthorized third party.
• December 2019 – The Contra Costa County Library IT systems were compromised by an unknown third party. The library later received a ransom demand for the restoration of services.
• February 8, 2021 – A hacker exploited a vulnerability in a desktop sharing platform to access a water utility’s treatment plant industrial control system. The hacker increased the quantity of a chemical used in the water treatment process to a dangerous level. An employee o f the utility noticed inconsistencies and immediately reduced the chemical levels to normal and notified the IT department.
• December 11, 2021 – UKG Kronos was a victim of a ransomware attack that incapacitated Long Beach Fire Department Staffing Program, Telestaff, for approximately 2 months. • April 30, 2018 – In Antioch, City employee email accounts were compromised through a phishing scheme. Hackers used access to accounts to send out fraudulent emails to City contacts. The City immediately disabled accounts and changed passwords of all City employees and advised residents and associates to take caution when opening emails from the City.

Location
Since computers are so ubiquitous, a cyber threat could appear in virtually any part of the City. In extreme circumstances, a threat could impact the entire City. Cyber threats vary in their length and severity of impact. A minor threat could cause compute r systems to slow down for a few minutes and not behave as responsively. On the other hand, a major cyber threat could cause a complete shutdown of critical systems, including those used by banks, healthcare institutions, universities, major businesses, and City governments.

Globally, cyber threats are increasing and becoming more sophisticated. The most common types of attacks include:
• Phishing
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 87 –
• Ransomware
• Intellectual Property Theft
• Spyware/Malware
• Unpatched Software.

Extent
The Index of Cyber Security ( Figure 4-16) can be referenced to understand the status of cyber threats, which identifies the measure of perceived risk. Since 2015, this index has trended upward and appears to have doubled in this timeframe.

Figure 4-16: Index of Cyber Security

Cyber threats are not measured on any scale, but they can be assessed by determining the following:
• The type of incident (website defacement, denial of service, unauthorized surveillance) • The use of malicious software
• The level of security countermeasures that failed to prevent the cyber threat • The duration of the cyber threat (a few hours, a few days, several weeks, etc.).

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 88 –
Possibility of Future Occurrence
Due to the integrated nature of technology into the everyday lives of Antioch’s residents, businesses, and government operations, it is possible that a cyber threat could emerge in the future. While no cyber threats are publicly known to have disrupted the City’s normal operations in the past, the likelihood of a cyber threat affecting the residents, businesses, and/or governmental operations in the future is increasing. There is a 60% change that the City will be affected by a cyber incident.

Power Outage
Hazard Descriptio n
A power outage is the loss of the electricity supply to an area. In addition to natural hazards, power outages can result from a defect in a power station, damage to a power line or other part of the distribution system, a short circuit, or the overloading of electricity mains.

A power outage may be referred to as a blackout if power is lost completely or as a brownout if some power supply is retained, but the voltage level is below the minimum level specified for the system, and a short circuit indicates a loss of power for a short amount of time (usually seconds).

Some brownouts, called voltage reductions, are made intentionally to prevent a full power outage.

Power outages may also be intentionally induced due to high power demand that exceeds supply or due to actions taken by utility companies to de-energize power lines when there is the possibility of energized power lines being downed during fire Red Flag warnings and causing fires.

History
Following devastating fires in California in 2017 and 2018, utility companies sought regulatory actions to allow them to de -energize power lines when conditions might result in downed lines causing wildfires. The California Public Utilities Commission developed guidelines for public safety power shutoffs (PSPS) that have affected numerous areas of the State for up to several days.

August 2020 saw the first California electricity providers institute rolling blackouts since 2001.

Hundreds of thousands of people experienced brief power outages through the several evenings after the body that manages most of the state's electric utiliti es declared a “Stage 3” emergency to help reduce stress on the larger grid.

The 2011 Southwes t blackout, sometimes referred to as the Great Blackout of 2011, was a widespread power outage that affected the San Diego –Tijuana area, southern Orange County, the Imperial Valley, Mexicali Valley, and Coachella Valley, and parts of Arizona. It occurred o n Thursday, September 8, 2011, beginning at about 3:38 pm PDT and was the largest power failure in California history.

Location
Power outages can occur throughout the City service area and affect the entire region.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 89 –
Extent
Power outages are typically measured by the number of customers without power. The System Average Interruption Duration Index (SAIDI) is a key reliability metric used by electric utilities to measure the average total duration of power interruptions that a customer experiences over a specific period, typically one year. SAIDI is expressed in units of time, such as minutes or hours per customer.

Probability of Future Occurrence
While the location, duration, and number of people affected cannot be predicted, power outages in the City service area are likely to occu r primarily due to severe weather, with the likelihood of an incident greater than 20% in any year.

Impact of Climate Change
Climate change may affect the number and severity of power outages. The August 2020 rolling blackouts resulted from high energy usage during record -setting heat throughout the state. As hotter conditions result in more and longer Red Flag warnings and conc omitant PSPS, more power outages will occur.

Regulatory Context
The California Public Utilities Commission (CPUC) plays a pivotal role in regulating privately - owned electric, natural gas, telecommunications, water, railroad, rail transit, and passenger transportation companies. It ensures safe, reliable utility service at reasonable rates and protects against fraud.

Hazardous Material Release – Pipeline Failure, Transportation Accidents, Oil Spills
Hazard Description
A hazardous material is any material that, due to its quantity, concentration, or physical or chemical characteristics, poses a significant present or potential hazard to human health and safety or to the environment if released. Hazardous materials includ e but are not limited to hazardous substances, hazardous wastes, and any material that a business or local implementing agency has a reasonable basis to believe would be injurious to the health and safety of persons or would be harmful to the environment if released.

The LHMP does not focus on the hazards contained in everyday products but rather on the hazards associated with potential releases of hazardous substances from transportation corridors and fixed facilities within the City.

Exposure to hazardous materials can cause injury, illness, or death. Effects may be felt over seconds, minutes, or hours (short -term effects) or not emerge until days, weeks, or even years after exposure (long-term effects). Some substances are harmful after a single exposure of short duration, but others require long episodes of exposure or repeated exposure over time to cause CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 90 –
harm.

Hazardous materials in the City service area primarily consist of paints, solvents, adhesives, gasoline, household cleaners, batteries, and pesticides and herbicides. The toxicity of a specific substance is one important factor in determining the risk it poses, but other factors can be just as important, if not more so. Factors affecting the severity of a hazardous material release include:
• Toxicity
• Quantity
• Dispersal characteristics
• Location of release in relation to population and sensitive environmental areas • Efficacy of response and recovery actions.

Mobile incidents include those that occur on a roadway or a railroad. These incident -related releases are dangerous because they can occur anywhere, including near human populations, critical facilities, or environmentally sensitive areas. Mobile incident-related releases can also be more difficult to mitigate because of the great area over which any given incident might occur and the potential distance of the incident site from response resources.

The release of hazardous substances from stationary sources can be caused by human error, equipment failure, intentional dumping, acts of terrorism, or natural phenomena. Earthquakes pose a particular risk because they can damage or destroy facilities cont aining hazardous substances. The threat posed by a hazardous -material event can be amplified by restricted access, reduced fire suppression and spill containment capability, and cutoff of response personnel and equipment.

Contra Costa Health Services Hazardous Materials Programs (CCHSHMP) is the designated Certified Unified Program Agency (CUPA) for the City. The CUPA program was created by the California legislature to minimize the number of business inspections and fees i mposed on businesses associated with the handling of hazardous materials.

History
There have been no significant incidents of hazardous materials release in the City.

Location
The City, like many urban areas, handles and stores various hazardous materials essential for industrial, commercial, and public health applications. The following provides a list of potential sources for hazardous materials releases within the City planning area:
• Public Works Corporation Yard
• Prewett Water Park
• Water Treatment Plant
• Antioch Police Department, City Hall, and The Antioch Marina.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 91 –
Extent
The extent of a hazardous material spill may vary from significant impacts causing injuries and evacuation to minor impacts requiring minimal cleanup. Hazardous materials releases can be harmful in the following ways:
• Chemical, biological, and radiological agents can cause significant health risks to those exposed to them; biological agents can be additionally dangerous if they are infectious.

Flammable and explosive materials also present life safety concerns when exposed to heat.
• Oil spills can present an immediate fire hazard and can contaminate drinking water supplies. Any release of hazardous material requires a thorough and careful clean -up of the site and decontamination of those exposed. Clean-up and recovery are time and cost consuming.
• Delays caused by hazardous materials releases and the ensuing evacuation and cleanup processes could lead to significant economic losses due to traffic delays (mobile releases) or operational shut-down (fixed facilities).
• Overall, hazardous materials can cause death, serious injury, long -lasting health effects, and damage to buildings, the environment, homes, and other property.

Probability of Future Occurrence
Based on previous occurrences, the likelihood of small hazardous materials releases is high and can occur at any time.

Regulatory Environment
To address the release of hazardous materials, Contra Costa County has implemented several regulatory measures and public health initiatives. These efforts aim to minimize risks, ensure compliance with environmental laws, and promote community awareness. • The Bay Area Air Quality Management District (BAAQMD) is responsible for regulating air quality in the region. It sets emissions standards, monitors air pollution, and enforces regulations to reduce the release of hazardous air pollutants. • Contra County Health Services works to protect public health by monitoring and regulating facilities that use toxic and other hazardous materials through CUPA. • The California EPA oversees environmental protection efforts statewide, including Contra Costa County. It enforces regulations related to hazardous waste, water quality, and toxic substances, and provides funding for cleanup and mitigation projects.

4.5.1 0 LANDSLIDE
Hazard Description
A landslide is the movement of a mass of rock, debris, or earth down a slope. Landslides are a type of "mass wasting," which denotes any downslope movement of soil and rock under the direct influence of gravity. The landslide term is comprised of five (5) types of slope movement – falls, CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 92 –
topples, slides, spreads, and flows – which are further subdivided by the type of geologic material (i.e., bedrock, debris, or earth). Slope movement occurs when forces acting downslope exceed the strength of the earth’s material that composes the slope. The modes of slope movement are listed in Table 4-17.

Table 4-17: Types of Slope Movement
Type Description
Falls Masses of soil or rock that dislodge from steep slopes and free fall, bounce, or roll downslope.

Topples Move by the forward pivoting of a mass around an axis below the displaced mass.

Slides
Displaced masses of material along one (1) or more discrete planes. There are two (2) types of sliding – rational and translational.

Rotational sliding the slide plane is curved and the mass rotates backwards around an axis parallel to the slope.

Translational sliding the failure surface is more or less planar and the mass moves parallel to the ground surface.

Lateral
Spreads
Move by horizontal extension and shear or tensile fractures and are commonly induced by liquefaction of material in an earthquake.

Flows Mobilize as a deforming, viscous mass without a discrete failure plane.

Complex Occurs when more than one (1) type of movement occurs sequentially during a failure.

Composite Occurs when more than one (1) type of movement does not occur sequentially during a failure.

The California Department of Conservation (CDC) classifies landslides into the six (6) categories listed in Table 4-18.

Table 4-18: Types of Common Landslide
Type Description
Earth Flows The majority of the soil materials are fine-grained, cohesive silt and clay and occur in moderately steep slopes (10% to 30% grade). Earth flows are slow moving (centimeters or millimeters over a period of days or weeks) and are often triggered by periods of prolonged rainfall and sometimes do not occur until well after a rainfall event or the rainy season.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 93 –
Table 4-18: Types of Common Landslide
Type Description
Debris Flows The majority of the soil is coarse-grained (e.g., fine sand to boulder size particles) and non-cohesive and commonly begin as a slide of a shallow mass of soil and weathered rock. Debris flows tend to be small in areal extent and their deposits are relatively thin.

Debris Slide
The majority of the soil is coarse-grained, most common in unconsolidated sandy or gravelly units, but also are common in residual soils that form in- place weathering of relatively hard rock. Debris slides tend to occur on very steep slopes (60% to 70% grade) where the base of the slope is undercut with erosion. These move at rates between meters per day to meters per minute and are often triggered after a single heavy rainstorm or series to storms that deliver enough rain to trigger a debris slide.

Rockslides Involves bedrock in which the rock that moves remains largely intact for at least a portion of the movement. Rockslides occur in a variety of sizes on a variety of gradients (35% to 70% grade) and have a range of triggering mechanism.

Rock Falls Occurs when a mass of rock detaches from a steep slope by sliding, spreading, or toppling and descends mainly through the air by falling, bouncing, or rolling. Rock falls can be triggered by intense rain, earthquakes, and freeze-thaw wedging.

Additionally, earthquake shaking can induce underwater landslides (i.e., submarine landslides) which can cause tsunamis potentially resulting in damage to coastal areas.

Location
The best available predictor of where movement of slides and earth flows might occur is the location of past movements. Past landslides can be recognized by their distinctive topographic shapes, which can remain in place for thousands of years. Most landsl ides recognizable in this fashion range from a few acres to several square miles and many show no evidence of recent movement and are not currently active. A small proportion of them may become active in any given year, with movements concentrated within all or part of the landslide masses or around their edges.

Landslide susceptibility maps describe the relative likelihood of future land sliding based solely on the intrinsic properties of a location or site. There are three (3) site factors that most determine susceptibility – prior failure, rock or soil strength, and steepness of slope. Figure 4-17 illustrates the California Geological Survey Landslide Susceptibility Data in Antioch. The areas of greatest threat from landslides are the residential areas adjacent to the foothills in the western, central, and southern portions of the City.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 94 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 95 –
Figure 4-17: City of Antioch Landslide Susceptibility Zones

History
In Contra Costa County, landslides have occurred in conjunction with heavy rainfall events. Table 4-19 lists landslide events that affected Contra Costa County between 1980 and 2023.

There is no record for Contra County of fatalities attributed to landslides.

Table 4-19: Significant Landslide Events
Date Event Type Location Description
December 27, 2022 –
January 31, 2023
Severe storms,
flooding,
landslides, and
mudslides
Contra Costa
County
(43 other
counties in
the State)
An atmospheric river impacted
the State of California beginning
on December 27, 2022,
producing torrential rainfall which
resulted in catastrophic
landslides and mudslides
throughout Contra Costa County.

February 27, 2017 –
March 4, 2017
Mudslide Near the City
of Concord
and City of
Brentwood
A slow-moving mudslide closed
the 3100 block of Morgan
Territory Road from Concord to
Brentwood and Livermore. It
caused Contra Costa Water
District’s water line to break,
which affected about 90
customers.

January 3, 2017 –
January 12, 2017
Severe storms,
flooding, and
mudslides
Contra Costa
County
(33 other
counties in
the State)
Trees and landslides covered
roadways throughout the Bay
Area. (DR-4301)
March 13, 2016 Landslide Town of
Moraga
A landslide forced two (2)
homeowners to evacuate their
homes in the Town of Moraga. A
lower portion of the hill slid into
San Pablo Creek in January.
2011 Winter Storm Local Central Contra Costa Sanitary
District reported landslides and
damage to sewer pipes.

December 17, 2005 –
January 3, 2006
Severe storms,
flooding,
mudslides, and
landslides
Contra Costa
County
A series of rainfall events caused
significant runoff with localized
evacuations, some slope failures,
and road closures throughout the
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 96 –
Table 4-19: Significant Landslide Events
Date Event Type Location Description
(29 other
counties in
the State)
declared counties. Urban flooding
initiated landslides that
contributed to the damage. In
Contra Costa County, much of
the damage was in the following
cities – Walnut Creek, Richmond,
San Pablo, Martinez, and Orinda.

Damaged facilities
included schools, park areas, and
several government agency
structures. (DR-1628)
February 13, 2000 –
February 14, 2000
Flash Flood Countywide Widespread rainfall occurred
over 24 hours with accumulations
exceeding five (5) inches.

Several homes in Daly City had
to be evacuated due to
mudslides and consecutive years
of above average rainfall.

February 2, 1998 –
April 30, 1998
Severe winter
storms and El
Niño rainstorm
San
Francisco Bay
Area
Widespread flooding occurred
that caused landslides in Contra
Costa County. (DR-1203)
December 2, 1996 –
April 1, 1997
Severe storms,
flooding,
mudslides, and
landslides
Contra Costa
County
(46 other
counties in
the State)
Minor landslide damage in
Contra Costa County was
attributed to heavy rainfall and
saturated soils. (DR-1155)
February 13, 1995 –
April 19, 1995
Severe winter
storms,
flooding,
landslides, and
mud flows
San
Francisco Bay
Area
Minor landslide damage in
Contra Costa County was
attributed to heavy rainfall and
saturated soils. (DR-1046)

Extent
Although there are no scales for the intensity or severity of landslides, understanding the likelihood of deep land sliding based on regional estimates of rock strength and steepness of slopes can help understand the extent and intensity of potential landslides. A statewide analysis of landslide susceptibility was conducted by the California Geological Survey using a combination of regional roc k strength and slope data to create classes of susceptibility (Figure X-X). The methodology used for the analysis assumed, in general, that landslide susceptibility is low on very low slopes in all rock materials, and that susceptibility increases with slope and in weak rocks.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 97 –
The analysis also factored in locations of past landslides.

Figure 4-X: City of Antioch Landslide Susceptibility Classes

Warning Time
Landslides can occur suddenly or slowly. The velocity of mass movement depends on slope angle, material, and water content. Some methods used to monitor mass movements can provide an idea of the type of movement and the amount of time prior to failure. It is also possible to determine what areas are at risk during general time periods. Assessing the geology, vegetation, and amount of predicted precipitation for an area can help in these predictions. However, there is no practical warning system for individual landslides.

USGS provides a system of notification for potential landslides, listed in Table 4-20. Watches and warnings may be issued for discrete areas and include advice about contacting the area's local emergency management. Additionally, rainfall induced debris flows watches and warning are weather dependent and will closely track NWS advisories for flash flooding.

Table 4-20 USGS Landslide Advisories
Type Description

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 98 –
Landslide Advisory A general statement about the potential of landslide activity in a given region relative to developing rainfall predictions. An advisory may include general statements about rainfall conditions that can lead to debris flow activity, and list precautions to be taken in the event of heavy rainfall.

Landslide Watch Means that landslide activity will be possible but is not imminent.

People in, or planning to travel through, a watch area should know landslide preparedness and stay informed about developing weather patterns.

Landslide Warning Indicate that landslide activity is presently occurring, and extreme caution should be taken.

Probability of Future Events
The probability of landslides in Antioch is moderate, and significant occurrences of this hazard are likely to occur in conjunction with earthquakes, or during periods of prolonged and/or heavy rainfall. However, localized landslides are unlikely (25% chance) to occur annually.

The landslide annualized frequency value represents the average number of recorded landslide hazard occurrences in event days per year over the period of record (11.8 years). Table 4-21 outlines the annualized frequency for landslides, based on FEMA NRI data, for Contra Costa County. While the FEMA NRI has an annual frequency of zero (0) landslide events in the County, studies and landslide data suggest that at least one (1) landslide event can occur every year.

Table 4-21: Landslide Annualized Frequency (FEMA National Risk Index) Location Events on Record
(2010 – 2021)
Annualized
Frequency
Contra Costa County 12 0.00
Annualized frequency is defined as the expected frequency or probability of a hazard occurrence per year.

Impacts of Climate Change
Climate change does not directly cause more frequent or intense landslides. However, it is expected to increase the conditions that can lead to landslides, such as an increase in heavy storms that saturate the ground and make landslides more likely. Although heavy precipitation does not necessarily result in landslides, landslides are predominantly a result of saturated soils, it is possible that increased intensity of rain events will result in a greater number of landslides CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 99 –
annually and an increase in the severity of impacts. Increasing temperatures are expected to increase the occurrence and duration of droughts and the probability of wildfire, reducing the vegetation that helps to support slopes and slows down water. Overall, the impacts of climate change on drought, heavy rainfall, and wildfire will result in an increased probability for landslide occurrences.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 100 –
SECTION 5: RISK ASSESSMENT

5.1 Hazard Risk Rating
For the 2025 LHMP, the risk for each potential hazard was rated using the C alculated Priority Risk Index (CPRI) . The CPRI examines four (4) criteria for each hazard (probability, magnitude/severity, warning time, and duration) (Table 5-1). For each hazard, an index value is assigned for each CPRI category from 0 to 4, with “0” being the least hazardous and “4” being the most hazardous situation. This value is then assigned a weighting factor, and the result is a hazard ranking score (Table 5-2).

Table 5-1: Calculated Priority Risk Index
CPRI
Category
Degree of Risk Chart
Assigned
Weight Level ID Description Index
Value
Probability Unlikely Extremely rare with no documented
history of occurrences or events.

Annual probability of less than 0.001.
1 45%
Possible Rare occurrences with at least one
(1) documented or anecdotal historic
event. Annual probability of between

0.01 and 0.001.
2 Likely Occasional occurrence with at least
two (2) or more documented
historical events. Annual probability
of between 0.1 and 0.01.
3 Highly Likely Frequent events with a well-
documented history of occurrence.

Annual probability of greater than

0.1. 4
Magnitude-
Severity
Negligible Negligible property damages (less
than 5% of critical and non-critical
facilities and infrastructure).

Injuries or illnesses are treatable with
first aid, and there are no deaths.

Negligible quality of life lost.

Shut down of critical facilities for less
than 24 hours.
1 30%
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 101 –
Table 5-1: Calculated Priority Risk Index
CPRI
Category
Degree of Risk Chart
Assigned
Weight Level ID Description Index
Value
Limited Slight property damages (greater
than 5% and less than 25% of critical
and non-critical facilities and
infrastructure).

Injuries and illnesses do not result in
permanent disability, and there are
no deaths.

Moderate quality of life lost.

Shut down of critical facilities for
more than 1 day and less than 1
week.
2 Critical Moderate property damages (greater
than 25% and less than 50% of
critical and non-critical facilities and
infrastructures).

Injuries or illnesses result in
permanent disability and at least one
death.

Shut down of critical facilities for
more than 1 week and less than 1
month.
3 Catastrophic Severe property damages (greater
than 50% of critical and non-critical
facilities and infrastructure). Injuries
or illnesses result in permanent
disability and multiple deaths.

Shut down of critical facilities for
more than 1 month.
4 Warning
Time
> than 24
hours
Population receives greater than 24
hours of warning.
1 15%
12 to 24
hours
Population receives between 12-24
hours of warning.
2 6 to 12
hours
Population receives between 6-12
hours of warning.
3 < than 6
hours
Population receives less than 6
hours of warning.
4 CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 102 –
Table 5-1: Calculated Priority Risk Index
CPRI
Category
Degree of Risk Chart
Assigned
Weight Level ID Description Index
Value
Duration < than 6
hours
Disaster event will last less than 6
hours.
1 10%
6 to 24
hours
Disaster event will last between 6-24
hours.
2 24 hrs.
to 1
week
Disaster event will last between 24
hours and 1 week.
3 > than 1
week
Disaster event will last more than 1
week.
4 Table 5-1: Calculated Priority Risk Index
CPRI
Category
Degree of Risk Chart
Assigned
Weight Level ID Description Index
Value
Probability Unlikely Extremely rare with no documented
history of occurrences or events.

Annual probability of less than 0.001.
1 45%
Possible Rare occurrences with at least one
(1) documented or anecdotal historic
event. Annual probability of between

Annual probability of greater than

0.1. 4
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 103 –
Table 5-1: Calculated Priority Risk Index
CPRI
Category
Degree of Risk Chart
Assigned
Weight Level ID Description Index
Value
Magnitude-
Severity
Negligible Negligible property damages (less
than 5% of critical and non-critical
facilities and infrastructure).

Injuries or illnesses are treatable with
first aid, and there are no deaths.

Negligible quality of life lost.

Shut down of critical facilities for less
than 24 hours.
1 30%
Limited Slight property damages (greater
than 5% and less than 25% of critical
and non-critical facilities and
infrastructure).

Injuries and illnesses do not result in
permanent disability, and there are
no deaths.

Moderate quality of life lost.

Injuries or illnesses result in
permanent disability and at least one
death.

Shut down of critical facilities for
more than 1 month.
4 Warning
Time
> than 24
hours
Population receives greater than 24
hours of warning.
1 15%
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 104 –
Table 5-1: Calculated Priority Risk Index
CPRI
Category
Degree of Risk Chart
Assigned
Weight Level ID Description Index
Value
12 to 24
hours
Population receives between 12-24
hours of warning.
2 6 to 12
hours
Population receives between 6-12
hours of warning.
3 < than 6
hours
Population receives less than 6
hours of warning.
4 Duration < than 6
hours
Disaster event will last less than 6
hours.
1 10%
6 to 24
hours
Disaster event will last between 6-24
hours.
2 24 hrs.
to 1
week
Disaster event will last between 24
hours and 1 week.
3 > than 1
week
Disaster event will last more than 1
week.
4 The results of the CPRI are contained in Table 5-2 below:

Table 5-2: Calculated Priority Risk Index Summary
Hazard
Probability
Weighted
45%
Magnitude
Severity
Weighted
30%
Warning
Time
Weighted
15%
Duration
Weighted
10%
CPRI
Ranking
Aquatic Invasive
Species
2 .90 1 .30 2 .30 4 .40 1.90
Climate Change 4 1.80 2 .60 1 .15 4 .40 2.95
Cyber Attack 3 1.35 4 1.20 4 .60 4 .40 3.55
Dam Failure 1 .45 2 .60 3 .45 1 .10 1.60
Drought 3 1.35 2 .60 1 .15 4 .40 2.50
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 105 –
Table 5-2: Calculated Priority Risk Index Summary
Hazard
Probability
Weighted
45%
Magnitude
Severity
Weighted
30%
Warning
Time
Weighted
15%
Duration
Weighted
10%
CPRI
Ranking
Earthquake 3 1.35 3 .90 4 .60 4 .40 3.25
Severe Weather 3 1.35 4 1.20 1 .15 3 .30 3.00
Fire
(Wildland/Urban)
4 1.80 3 .90 4 .60 3 .30 3.60
Flooding 2 .90 1 .30 1 .15 1 .10 1.45
Hazardous
Material Releases
2 .90 2 .60 4 .60 2 .20 2.30
Landslide 2 .90 1 .30 3 .45 1 .10 1.75
Power Outage 3 1.35 3 .90 3 .45 2 .20 2.90
CPRI Hazard Risk Scoring
Risk Level Severe High Moderate Low
Rank Score 3.5 – 4.0 3.0 – 3.4 2 – 2.9 1.0 – 1.9

Power outages has the most immediate and disruptive impacts on the City due to potential interruption of public safety systems and water service to customers.

5.2 Populations and Infrastructure At Risk
The City of Antioch’s diverse population and extensive infrastructure face significant risks from natural hazards. Special attention must be given to vulnerable groups and critical facilities to enhance preparedness, reduce risks, and foster community resilience. Effective planning, public education, and investment in resilient infrastructure are key strategies for protecting Antioch’s people and assets from the impacts of future natural disasters.

5.3 Critical Facilities and Facilities of Concern
Critical facilities (CF) consist of properties and structures that play important roles in government operations and the services they provide to the community. Examples of CFs include local government offices and yards, community centers, public safety bu ildings like police and fire stations, schools, and other properties a City has deemed essential for its operations. Critical CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 106 –
Facilities may also serve dual roles if a City designates them as public assembly points during an emergency. Critical Facilities are often owned by the City, but some may also be owned and operated privately, such as some utilities and telecommunication infrastructure. Facilities of Concern (FOC) are similar to critical facilities; however, the City may not own them, or their purpose and function are not as important to the function of the City after a disaster. These facilities are identified to ensure th e City understands their potential vulnerability to the hazards of concern.

The HMPT identified a total of 95 facilities (74 CFs and 21 FOC) in Antioch that fall into four (4) categories based on their function or characteristics. Table 5-3 shows the number of CFs and FOC in each category, the total estimated replacement value for these facilities, and examples of the type of facility in each category. Figure 5-1 shows the locations of the mapped CFs and FOC in Antioch. For security reasons, water and wastewater infrastructure was not mapped in any of the figures.

The potential loss values identified in subsequent tables are based on the City’s total insured value using the City’s Insured Asset Inventory. It is intended to provide an estimate of the replacement cost if the property/structure is completely or severely damaged. The actual costs of repair could be smaller or larger than the provided estimate. Since the data comes from the City’s Insured Asset Inventory, no facilities not owned by the City will not have a replacement value listed. Where this occurs, “N/A” has been used within the table.

Based on the available data provided by the City, a minimum of $233,270,404.00 worth of City- owned assets were analyzed. The total potential loss value of all City-owned and non-City-owned assets is much higher but is unknown due to data limitations.

The greatest potential for loss among City-owned assets comes from the water distribution system category, which includes but is not limited to the water reservoirs, pump stations, and water treatment facilities throughout the City. The next critical facility category with the greatest potential for loss would be City owned buildings, which include City Hall, Police Station, and public works facilities.

To better understand the magnitude of impacts, this plan identifies representative percentages of potential impact based on the total valuation of City assets. For planning purposes, we identified different tiers of impact that could occur. It is reasonable to assume that impacts would not exceed 50% of the total asset value City-wide during a single event. The following are parameters to help understand how much a proposed investment/improvement compares to the existing assets within the City:
• 1% Impact - $2,332,704.00
• 5% Impact – $11,663,520.00
• 10% Impact – $23,327,040.00
• 20% Impact - $46,654,080.00
• 50% Impact - $116,635,202.00.

The possibility that all facilities will be completely damaged simultaneously is extremely rare.

Based on the hazard, most impacts are anticipated to be isolated to certain locations. This CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 107 –
estimate does not include the value of the City's underground infrastructure and surface drainage facilities.

Table 5-3 lists the number of facilities and their associated potential replacement values.

Table 5-3: Critical Facilities and Facilities of Concern in Antioch Category
# of
Facilities -
Critical
# of
Facilities -
Concern
Examples Potential Loss
Government
Operations,
Emergency
Operations
9 8 City Hall, City Hall
Council Chambers,
Corporate Yard, Fuel
Storage Tanks, Police
Facilities
$62,428,484.00
Water and
Wastewater
Infrastructure,
56 0 Reservoirs, Stations,
Booster Stations,
Pressure Reducing
Systems, Water
Treatment,
Conveyance Systems
$102,759,480.00
Recreational
and Community
Centers
9 13 Stadium, Museum,
Libraries, Golf
Courses, Parks,
Community Centers,
etc.
$68,082,440.00
Total 74 21 --- $233,270,404.00
* Potential loss data are estimates only, as replacement values for some facilities were not available.

Actual losses may be greater than the estimate presented in this table.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 108 –

Figure 5-1: City Map with City Owned Infrastructure

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 109 –

5.4 Analysis of Potential Losses by Hazard

5.4.1 AQUATIC INVASIVE SPECIES
Physical Threat
Aquatic invasive species have profound impacts on reservoirs, disrupting ecosystems and infrastructure. These non-native organisms often outcompete local species, altering food webs and reducing biodiversity. Their presence can clog intake systems, hinder water flow, and increase maintenance costs for facilities. Moreover, invasive species can degrade water quality, complicating operations for both government and emergency facilities relying on reservoir resources for functionality. The physical threat can be managed with proper mitigation activities that are ongoing.

Social Threat
Aquatic invasive species will not have any social threats as it is not expected to impact the population.

Changes in Population Patterns and Land Use and Development Aquatic invasive species are unlikely to affect land use and development.

5.4.2 CLIMATE CHANGE
Physical Threat
Climate change introduces significant physical threats to infrastructure, particularly in reservoir - dependent regions. Alterations in precipitation patterns and increased instances of extreme weather events can lead to heightened risks of flooding, erosion , and sedimentation. Climate Change can place immense strain on reservoirs and surrounding structures, necessitating higher maintenance and adaptive design measures. Infrastructure such as intake systems, dams, and levees may experience accelerated wear and tear due to fluctuating water levels, while prolonged droughts can reduce water availability, undermining operations reliant on these systems. Effective planning and resilient engineering practices are crucial to mitigate these challenges and preserve functionality.

Social Threat
Climate change disproportionately affects marginalized communities. Those who lack access to resources, infrastructure, and support systems are at the greatest risk of experiencing its adverse effects. In urban settings, marginalized groups living in underprivileged neighborhoods are more likely to suffer from heatwaves and water shortages.

Changes in Population Patterns and Land Use and Development Climate change is not expected to cause changes in populations patterns or development.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 110 –

5.4.3 DAM FAILURE
Physical Threat
Various factors, such as the amount of water released, the distance between the dam failure site, and the topography of the surrounding land, will influence the extent to which physical assets in Antioch are threatened. The Antioch Reservoir has large storage capacities that could cause localized inundation in Antioch if the reservoir waters are released due to a dam breach. Table 5- 4 identifies the physical assets in Antioch that are threatened by the potential failure of the reservoir. Based on this analysis, dam inundation would affect three (3) CFs and zero (0) FOC within the City, with the potential to cause approximately $ 43 million in damages , based on available information. Figure 5-2 shows the location of the identified CFs and FOC within these dam inundation zones.

Table 5-4: Critical Facilities and Facilities of Concern (Dam Failure) Category
# of
Facilities
- Critical
# of
Facilities -
Concern
Potential
Loss*
Government Operations 2 0 $8,427,589
Emergency Operations 1 0 $35,484,509
Recreation 0 0 $0
Total 3 0 $43,912,098
* Based on the City of Antioch insured replacement values.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 111 –

Figure 5-2: Critical Facilities and Facilities of Concern in Dam Inundation Zones

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 112 –
Social Threat
Dam failure hazards in the City would impact various downstream properties and the residents that live there. Table 5-5 identifies these potential dam failure impacts caused by the Antioch Reservoir failure. Failure of the dam would affect less than 13% of the population and inundate less than 5% of the acreage in the City.

Table 5-5: Dam Failure Threatened Populations
Threatened Population Metric Inundation Hazard City
Population 15,340 118,000
Households 5,300 34,000
* Amounts are estimates only, as exact values for some statistics were not available. Actual percentages might be greater than the estimate presented in this table.

Other Threats
Dam failures are often triggered by other events (e.g., seismic shaking, intense rainstorms, etc.).

There would most likely be service disruptions in Antioch if this type of event occurred.

Floodwaters could quickly inundate the City, disrupting utilities such as water, power, and other services (communications or transportation infrastructure). Residents may find street lighting and traffic signals are temporarily disabled. Debris carried by the rapid inundation may result in injury of death, destroyed structures and facilities and damage to transportation systems.

Changes in Population Patterns and Land Use and Development Population in the inundation zone may choose to move out of the City or out of the inundation area if the impacts of dam failure are great enough.

Dam failure is unlikely to affect land use and development because the development review process will take steps to mitigate or minimize flood -related impacts. Areas inundated within the City would not be significantly altered, requiring changes in land use and development patterns.

5.4.4 DROUGHT
Physical Threat
Since the primary threat from drought is reduced water supply and availability, there are no foreseeable threats to any of the City’s physical assets. It is possible that any water delivery infrastructure not used or used less than usual may fall into some degree of disrepair if maintenance is deferred. Lower water pressures may cause some aged water pipes to release rust particles into the water supply. Amenities within facilities, like water features and landscaping, could be affected by reduced watering. If dead or dying vegetation becomes a nuisance, the City may have to replace or retrofit locations affected.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 113 –
Social Threat
Droughts are unlikely to cause serious social threats to households in Antioch, though residents and business owners in the City may experience financial impacts associated with water conservation efforts. Those with less access to financial resources, such as low -income households or seniors, could be harder hit if higher water rates or additional fees are imposed during a severe drought event.

Other Threats
A typical drought is not anticipated to lead to any outages in service in Antioch. However, an exceptional drought may lead to restricted water use for residents or businesses in the City. Trees that are not adequately adapted to lower irrigation levels could perish, altering the City’s aesthetic appearance and long -term air quality. Any open spaces with extensive lawns may start to die, turning brown, which could discourage residents from using these parks and open spaces. In addition, long-term drought conditions can change and reduce soil’s ability to absorb water. When this occurs, water runoff from these areas may increase, which could cause downstream flooding and erosion in some areas.

Changes in Population Patterns and Land Use and Development Droughts occur periodically (primarily during the Summer/Fall months) and generally do not affect populations to the degree that they would need to migrate in and out of the City. The anticipated population growth in Antioch is unlikely to have any significant effect on population growth.

It is unlikely that drought will affect land use and development because the development review process will take steps to mitigate or minimize the impacts and vulnerability of drought in Antioch.

5.4.5 EARTHQUAKE /GEOLOGICAL HAZARDS
Physical Threat
Many physical assets in the City are estimated to experience the same seismic shaking intensity, ranging from 85 % to 95% (shaking intensity in relation to the earth’s gravity). Therefore, all facilities could be damaged during a significant seismic event, which would be extremely costly for the City. If all facilities were damaged at the same time during a seismic shaking event, it can be assumed that the City would incur a percentage of the maximum potential loss of its physical assets. Assuming 20% of the City’s assets are impacted, this potential loss could amount to over $46 million. Underground physical assets, like pipelines or utilities, could be damaged if seismic shaking were strong enough to cause a rupture. In such a scenario, natural gas and water delivery service to Antioch homes and businesses would be incapacitated until repairs are completed.

Table 5-6 displays these potential losses that could incur should shaking reach the described threshold. Figure 5-7 displays the CFs and FOC within the City’s seismic shaking potential hazard zones.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 114 –
Table 5-6: Critical Facilities and Facilities of Concern (Earthquake) Category
# of
Facilities
- Critical
# of
Facilities
- Concern
Potential Loss*
Government Operations, Emergency
Operations
9 8 $62,428,484.00
Water and Wastewater Infrastructure 56 0 $102,759,480.00 Recreational and Community Centers 9 13 $68,082,440.00
Total 74 21 $233,270,404.00
* Based on the City of Antioch insured replacement values.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 115 –

Figure 5-3: Earthquake Threat Map with City infrastructure

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 116 –
Social Threat
The risk of a seismic event is a danger to all groups in Antioch though some are more threatened than others. Seniors, pregnant women, and persons with disabilities are more threatened by seismic shaking since they may have limited mobility and may be unable to reach shelter in time.

Even if these groups reach shelter in time, they may find themselves trapped if furniture or building components have fallen around them. Renters and low-income people are also more threatened by seismic shaking since these groups may live in homes that are not properly retrofitted to survive the stresses of a seismic event. These groups may not be able to absorb the costs associated with repairing their homes or looking for new housing should their existing one be too damaged for occupancy. Table 5-7 displays the threatened populations in Antioch associated the seismic shaking scenarios.

Table 5-7: Earthquake Threatened Populations
Threatened Population Metric Earthquake Hazard City
Population 118,000 118,000
Households 34,000 34,000
* Amounts are estimates only, as exact values for some statistics were not available. Actual percentages might be greater than the estimate presented in this table.

Other Threats
With early earthquake warning systems becoming operational, it can be expected that utilities will take advantage of these advance warnings to shut off gas, water, and power transmission to control any potential leaks following the seismic shaking. Authorities may have enough time to halt the use of infrastructure or move workers to safe locations away from hazardous conditions.

Workers could cease their activity and take shelter until they can be safely evacuated. Therefore, all services could be non-operational during the shaking event and remain inactive until authorities are confident that it is safe to reactivate utilities and return employees to their workplaces. The length of this time would vary depending on the magnitude of the event. A significant earthquake would likely put utilities out of commission and halt any employment activity in the City for a few hours or several days. The City and the region would experience reduced economic activity during the outage period, which would not be felt for w eeks, months, or years later. Structures such as telephone poles or power transmission towers felled by the shaking could block roadways and prevent emergency response teams from reaching victims or evacuees who need assistance.

Changes in Population Patterns and Land Use and Development It is not anticipated that population patterns will change over the next 20 years. While this may also be true concerning land use and development, if a strong earthquake impacts the City, there is the potential that older structures may be impacted more severely than newer structures in the City.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 117 –

5.4.6 EXTREME WEATHER (SEVERE WINDS, EXTREME HEAT,

SEVERE RAINSTORMS)
Physical Threat
Severe Winds
Intense winds likely present the greatest threat to physical structures, particularly from trees or branches that fall on buildings/vehicles, causing substantial damage. Older structures that have deferred maintenance or have not been retrofitted for high wind conditions may suffer greater damage than newer/updated structures. Utility lines and wooden utility poles face an elevated threat from wind, as do buildings without reinforced roofs. Often utility poles and trees suffer impacts during high wind events if they occur after a significant rain event. During these events, saturated soils around the base of the tree/pole may be unable to hold up to the strains placed on it by strong winds causing it to fall over.

Trees, tree branches, and other objects have the potential to fall on powerlines and other electrical infrastructure during a severe windstorm, causing po wer outages throughout the City. Another physical threat of severe wind is wildfire impacts during the summer months.

Extreme Heat
Extremely high temperatures can cause roads to deform and buckle as the pavement expands in the heat, especially in areas that have not been maintained well. Power lines and other electrical grid components become less effective in higher temperatures and may be damaged due to stress during extreme heat events. Urban heat islands occur when natural land cover is replaced with concentrations of pavement, buildings, or other surfaces that absorb and retain heat.

Buildings with dark pavement will absorb more h eat than surfaces with vegetation or lighter materials that are better at reflecting the sun’s energy. This urban heat island effect is strongest during the summer when solar radiation is strongest.

Severe Rainstorms
Physical threats associated with severe rainstorms are similar in nature to those identified in the Flood discussion below.

Social Threat
Severe Wind
Severe wind events can harm people throughout Antioch but have a greater effect on the safety of people experiencing homelessness and those working outdoors. Populations that work outside or have respiratory illnesses may be impacted by severe wind events as they can generate dust and other contaminants that can affect the health of resi dents and workers. Lower -income residents, who may not have the financial resources to purchase homes (or are renting homes) that are not built or retrofitted to withstand p owerful winds, could also have difficulty recovering from wind events.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 118 –
Extreme Heat
Whereas a heat event can be relatively harmless for those with a reliable means of staying hydrated and cool, the event can be deadly for others. Young children, the elderly, or people suffering from serious medical conditions are physiologically more vulnerable to heatstroke. Some senior citizens also take medicines that can make it harder for their bodies to maintain a safe internal temperature, creating an additional threat from extreme heat events. Young children may not be aware of the signs of dehydration or ways of protecting themselves from heatstroke.

People living in homelessness are at a high risk of health complications during heat waves, especially if they are unsheltered. According to Antioch homelessness count, in 2025, there were approximately 556 individuals experiencing homelessness in the City, with 57% unsheltered. This population is very vulnerable to heatstroke during a heatwave, especially if they cannot reach a cooling center.

Sudden spikes in heat can catch people by surprise. Stores can rapidly sell out of fans, air - conditioning units, or drinking water during a heatwave. Many lower -income households live in older, poorly insulated, and energy -inefficient housing and cannot afford to run their air conditioning, which can be further compounded by the threat of power outages due to heat/rolling blackouts. During these events, extreme heat impacts may affect larger portions of the City and populations that would not be viewed as vulnerable under normal circumstances.

Severe Rainstorm
Social threats associated with sever e rainstorms are similar in nature to those identified in the Flood discussion below. The following populations are most vulnerable to severe weather:
• Households with financial instability
• Persons that spend an extended amount of time outdoors • Persons with existing health conditions or limited mobility • Persons with language barriers and citizenship uncertainty • Persons living in mobile homes
• Overcrowded households.

Other Threats
Severe Wind
Pacific Gas and Electric and the City all experience seasonal winds and will for the near future.

Severe wind events can exacerbate other risks, such as wildfires.

Extreme Heat
Extreme Heat for any length of time can also affect other hazards and risks within the City. For example, it can create a spike in electricity demand leading to power loss/failure, food insecurities, and a rise in vector -borne disease transmission. Coupled with extreme wind, it can cause or spread urban fires and jeopardize additional neighborhoods/communities.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 119 –
Severe Rainstorm
Other threats associated with sever rainstorms are similar in nature to those identified in the Flood discussion below. Severe rain can lead to debris flows in wildfire affected areas of the City and cause significant property damage to areas of the City.

Changes in Population Patterns and Land Use and Development Severe Wind
Severe winds occur periodically (primarily during the Fall months) and generally do not affect populations to the degree that they would need to migrate in and out of the City. It is unlikely that severe wind will affect land use and development because the development review process will take steps to mitigate or minimize the impacts of severe wind.

Extreme Heat
It is not anticipated that population patterns will change over the next 20 years. There could be minor changes in population patterns due to extreme heat if people cannot continue to live in older structures with limited insulation and older cooling units.

It is unlikely that extreme heat will affect land use and development because the development review process will take steps to mitigate or minimize impacts from extreme heat. While it is unlikely that extreme heat will affect land use and development, it is possible that additional investment in older parts of the City will occur to modify structures to handle these conditions.

Severe Rainstorm
Severe rainstorms occur periodically (primarily during the winter months) and generally do not affect populations to the degree that they would need to migrate in and out of the City. However, in rare circumstances, there may be the need to evacuate households for a short period of time until the flooding recedes.

5.4.7 FLOODING
Physical Threat
Flooding poses a physical threat to the City, particularly during severe rainstorms which primarily occur in the winter months. Flooding poses a substantial risk to Antioch's transportation infrastructure. Roads, bridges, and highways can become impassable due to rising waters, cutting off access to essential services and disrupting daily commutes. Prolonged inundation weakens road surfaces and bridge supports, requiring expensive repairs or replacements . Homes and businesses are often the first casualties in flood-prone areas. Floodwaters can cause structural damage, mold growth, and loss of valuable assets, while also rendering properties uninhabitable or unusable for extended periods. This impacts not only individuals but also the local economy.

Flooding can disrupt the functioning of water and wastewater systems, leading to contamination, service interruptions, and heightened health risks for the population.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 120 –
Table 5-8: Critical Facilities and Facilities of Concern (100/500 Year Flood Zone) Category
# of
Facilities
- Critical
# of
Facilities -
Concern
Potential Loss*
Government Operations 2 0 $11,639,812
Emergency Operations 1 0 $5,046, 956
Recreational and Community Centers 0 0 $0
Total 3 0 $16,686,768
* Based on the City of Antioch insured replacement values.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 121 –

Figure 5-4: Critical Facilities and Facilities of Concern in FEMA Flood Zones

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 122 –
Social Threat
Floodwaters in both the 100-year zone and the 500-year zone are anticipated to rise to a depth of no more than one (1) foot above the base flood elevation. Flooding of this type would likely inundate curb cuts and sidewalks to some extent. People who walk or bike as their primary form of transportation may encounter difficulties if they do not have access to an alternative means of transportation. Seniors, persons with disabilities, and low -income persons are also likely to be impacted during these events.

Other Threats
Flooding may temporarily stop any type of transportation in the City. Debris from floodwaters can block roadways, hinder vehicle access, and potentially affect emergency response services. One (1) foot of rushing water is enough to carry small vehicles, depending on the velocity. A severe flood situation may prevent people who own smaller vehicles from driving to work, leading to reduced economic activity. Severe flooding that causes serious damage to homes and businesses may also reduce economic activity until repair work is completed.

Changes in Population Patterns and Land Use and Development It is unlikely that flooding will affect land use and development patterns in affected areas because the median income in impacted areas is higher than the City average. Additionally, the development review process ensures flood related impacts are mitigated or minimized.

Table 5-9: Flood-Threatened Populations
Threatened Population Metric Flood Hazard City
Population 9,678 118,000
Households 3, 412 34,000
* Amounts are estimates only, as exact values for some statistics were not available. Actual percentages might be greater than the estimate presented in this table.

5.4.8 FIRE
Physical Threat
Wildland Fire
The California Department of Forestry and Fire Protection has mapped High and Very High Fire Hazard Severity Zones (VHFHSZ) within the City’s Local Responsibility Area (LRA). The LRA is a government -designated area where a local agency, City, or county, NOT the State, is responsible for fire protection. An SRA is the opposite, where the State has responsibility for wildland fire protection. Figure 5-5 identifies these zones and the City’s CFs and FOC within the area. All structures within this fire zone are at an elevated risk of wildfire impacts and consist of mostly homes.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 123 –
All structures located within this zone are at an elevated risk of wildfire impacts. Table 5 -10 identifies zero (0) CFs and one (1) FOC within the wildfire hazard zone, resulting in a potential loss of approximately $ 600,000 based on available replacement values. Additional losses associated with the schools in these areas could also occur.

While these areas have a high degree of vulnerability to wildfire, other areas of the City may also be susceptible to ember cast. These areas, typically referred to as the WUI, are vulnerable if the right conditions exist. Typically, the WUI is impacted if adequate fuels are combined with dry conditions and strong winds. Sometimes, the ignition of a wildfire may occur if power lines around overgrown trees cause a spark and catch the tree on fire.

Table 5-10: Critical Facilities and Facilities of Concern (Wildfire) Category
# of
Facilities
- Critical
# of
Facilities -
Concern
Potential
Loss**
Government Operations, Emergency
Operations
0 0 $0
Emergency Operations 0 0 $0
Recreational and Community Centers 0 1 $600,000
Total 0 1 $600,000.00
*Based on the City of Antioch insured replacement values.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 124 –

Figure 5-5: Wildfire Hazard Zones Map with City infrastructure

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 125 –
Urban Fire
Structures and physical assets in Antioch that are not equipped with fire suppression technology or design features that mitigate fire vulnerability are at risk of fire. Generally, these buildings are older, may not be well maintained, or may not meet curr ent code requirements and regulations.

While all structures can be impacted by urban fire, older structures may have increased vulnerability to this hazard. Power lines located around overgrown trees, where the tree crown envelops part or all the power lin es, are also at risk of catching fire. When the wires overheat, they may ignite a fire in the tree, spread back to the power lines themselves, and burn the power line infrastructure. Underground utilities, like water delivery systems, residential electrica l systems, or natural gas pipelines, are not threatened by the occurrence of fire since any urban fires that emerge in Antioch are likely to occur on the surface.

Social Threat
A fire hazard most immediately threatens seniors and persons with disabilities. These groups may have limited mobility and reduced environmental awareness. For example, a senior who lives alone may not be aware that a fire has been ignited in their house until the room begins to fill with smoke or even flashover, at which point escape may be more difficult or impossible. Therefore, a fire that starts in or spreads to any senior residences in Antioch could be highly threatening to those populations. Persons with disabilities may require special mobility devices or caregiver assistance to go outside, which may not be readily available if a fire occurs. Other groups with increased threat levels include lower -income persons and renters. These persons may live in substandard housing with outdated materials known to be flammable. Renters and lower-income persons may also live in housing units with improperly designed or maintained electrical or heating systems that could lead to a fire. Additionally, these groups m ay not possess enough financial resources to rebuild their homes or search for new homes after a fire occurs.

Other Threats
Fires can consume power lines and force utility operators to shut off electrical and gas transmission activity, leading to utility outages in Antioch homes and businesses. Any streets surrounded by blazes or blocked by burning debris would hinder transport ation, prevent people from evacuating, and block emergency response crews from reaching the source of the fire.

Anyone living at the end of a cul-de-sac faces an elevated threat of being trapped if the fire occurs or spreads in a way that blocks evacuation. Fires that destroy trees or vegetation (especially within parks and open space areas) could limit or prevent the use of these areas, affecting future recreational opportunities for residents.

Outreach to residents and businesses to help them understand and prepare for these future events will become an important aspect of the City’s overall hazard mitigation strategy.

Changes in Population Patterns and Land Use and Development If a large urban fire were to occur, it is feasible that changes in population patterns could occur.

Land use and development patterns could change if a large urban fire were to occur that impacted older parts of the City. After that type of event, the City would rely on a redevelopment process to determine how best to rebuild.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 126 –

Table 5-11: Wildfire Threatened Populations
Threatened Population Metric Fire Hazard City
Population 19,498 118,000
Households 16,817 34,000
* Amounts are estimates only, as exact values for some statistics were not available. Actual percentages might be greater than the estimate presented in this table.

5.4.9 LANDSLIDE
Physical Threat
The City lies in a region characterized by diverse terrain, including hills and slopes, particularly in the South of the City. Landslides in the City can destroy homes, roads, and water/wastewater infrastructure which can lead to costly repairs. Table 5-12 displays these potential losses that could incur should landslides occur . Figure 5 -6 displays the CFs and FOC within the City’s landslide potential hazard zones. Landslides would not affect City infrastructure.

Table 5-12: Critical Facilities and Facilities of Concern (Landslide) Category
# of
Facilities -
Critical
# of
Facilities -
Concern
Potential
Loss*
Government Operations 0 0 $0
Emergency Operations 0 0 $0
Recreational and Community Centers 0 0 $0
Total 0 0 $0
* Based on the City of Antioch insured replacement values.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 127 –

Figure 5-6: Landslide Threat Map with City infrastructure

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 128 –
Social Threat
The sudden nature of landslides can result in fatalities, and injuries. Communities located near unstable slopes are especially vulnerable. When landslides damage homes and infrastructure, they force people to leave their homes. Displacement creates a host of challenges, including the immediate need for shelter, food, and clean water. Individuals and families may be relocated to temporary housing for a long period of time. Prolonged displacement can strain community bonds and lead to social isolation, particularly for vulnerable groups such as the elderly, disabled, and children. Table 5 -13 displays the threatened populations in Antioch associated the seismic shaking scenarios.

Table 5-13: Earthquake Threatened Populations
Threatened Population Metric Population in
Inundation Zone City
Population 2,438 118,000
Households 500 34,000
* Amounts are estimates only, as exact values for some statistics were not available. Actual percentages might be greater than the estimate presented in this table.

Other Threats
The destruction of homes, businesses, and agricultural lands diminishes livelihoods and erodes financial stability. Meanwhile, businesses impacted by landslides may struggle to recover, leaving employees without jobs and reducing economic activity. These d isruptions can cause a domino effect, in which the broader community suffers from reduced commerce, diminished tax revenue, and slower economic growth.

Changes in Population Patterns and Land Use and Development Landslides often render large tracts of land unsuitable for agriculture, habitation, or industrial purposes. The deposition of debris can bury fertile topsoil, while the instability of affected areas may prevent future construction or cultivation. In mountainous regions, landslide-prone slopes are frequently abandoned, reducing the availability of usable land and forcing communities to relocate or adapt. Buildings may be relocated to stable zones, and governments may enforce stricter zoning regulations that prohibit development in risky areas. Such policies, while necessary for safety, can limit economic growth and the expansion of cities.

5.4.10 HUMAN -CAUSED HAZARDS
Physical Threat
Cyber Attack
A significant cyber event could have considerable impact on the population, built environment, CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 129 –
lifeline infrastructure, environment and the economy. Most jurisdictions have several levels of security in place, dependent upon security levels of individuals and the geographical locations (onsite or remote). Many also have redundant dispatch centers with separate systems that can function if the primary center isn’t functioning.

A cyber-attack can infiltrate many institutions including banking, medical, education, government, military, and communication and infrastructure systems. The majority of effective malicious cyber- activity has become web based. Recent trends indicate that hackers are targeting users to steal personal information and targeting computers to cause system failures. The duration of a cyber- attack is dependent on the complexity of the attack, how widespread it is, how quickly the attack is detected, and the reso urces available to aid in restoring the system. A cyber -attack could be geared toward one organization, one type of infrastructure and/or a specific geographical area.

The affected area could range from small to large scale.

Hazardous Materials Release
Hazardous materials can cause damage to physical assets in Antioch if they are released into the environment. Corrosive hazardous materials can damage the exteriors of buildings or structures.

Flammable hazardous materials can be ignited and cause damage to nearby structures.

Generally, sites closer to the origin of the release of the hazardous materials are more at risk than those further away.

Power Outag es / Infrastructure Failure
Power Outages and Infrastructure Failures (disruptions) are considered a form of lifeline system failure and could have a significant impact on the population, environment, infrastructure, and the economy. Disruptions can be the consequence of another hazard, or can be the primary hazard, absent of an outside trigger. Because Antioch is connected to the Pacific Gas and Electric, if the power grid increases in other parts of the state , it could curtail the energy available to Antioch.

This vulnerability is compounded by the reality that our communities have become more reliant on power for gadgets and appliances to perform basic daily activities. This loss of power will not only be an inconvenience but could become a life-threatening experience. Many citizens rely on power to operate medical machinery to survive (i.e., oxygen tanks, dialysis machines).

Climate change considerations indicate that as the weather conditions change, there could be an increase in energy needs. This could be from both potential increase in heat and cold. These predicted increases will put ever greater strain on Antioch’s energy supply.

Social Threat
Cyber Security Incident
Cities like Antioch are an attractive target for criminals and cyber threat actors to exploit vulnerable systems to steal critical infrastructure data and proprietary information, conduct ransomware operations, or launch destructive cyberattacks. Successful cyberattacks against cities could lead to disruption of infrastructure services, significant financial losses, exposure of citizens’ private data, erosion of citizens’ trust in the smart systems themselves, and physical impacts to infrastructure that could cause physical harm or loss of life.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 130 –
Hazardous Materials Release
The threat of a hazardous materials release event affects those closest to a source of hazardous materials, including industrial sites, gas stations, gas transmission lines, sewer mains, and transportation incidents that produce hazardous material spills . Antioch residents living next to major transportation infrastructure such as highways or major roadways also face a greater risk of being affected by a hazardous materials release if vehicles transporting these materials accidentally release their contents into the environment. Groups such as the elderly, low-income, and renters face a greater risk of exposure since they may not have the financial resources necessary to retrofit their homes against infiltration by hazardous materials or relocate to a home farther from the potential sources of hazardous materials.

Power Outage /Infrastructure Failure
Power outages and infrastructure failures most immediately threaten seniors, people with disabilities, and those with home medical equipment. These groups often face the greatest threat during a power outage, during extreme heat or PSPS. Infrastructure failures are usually short term, which most of the population can withstand.

Changes in Population Patterns and Land Use and Development The hazards identified under human -caused hazards will not affect population patterns or land use and development, as no connection can be drawn between these hazards and changes in population patterns or land use and development.

It is not anticipated that population patterns will change over the next 20 years. A change in population pattern would only occur if a hazardous materials release was severe enough to require people to move for a prolonged period of time due to soil contamination.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 131 –
SECTION 6: CAPABILITIES ASSESSMENT
A capability assessment was conducted of the City’s authorities, policies, programs, and resources. From the assessment, goals, and mitigation actions were developed. The planning team also developed a plan to prioritize, implement, and administer the miti gation actions to reduce risk to existing buildings and new development.

6.1 Existing Authorities, Policies, Programs, and
Resources
An assessment of authorities, policies and programs, and resources was conducted to identify capabilities that reduce vulnerability to hazards. The capabilities include authorities and policies, such as legal and regulatory resources, fiscal resources, and staff (e.g., technical personnel such as planners/engineers with knowledge of land development and land management practices, engineers trained in construction practices related to building and infrastructure, planners and engineers with an understanding of natural or human -caused hazards, floodplain managers, surveyors, personnel with Geographic Information System (GIS) skills, and staff with expertise of the hazards in the planning area).

The planning team also considered ways to expand on and improve these existing policies and programs to integrate hazard mitigation into the day -to-day activities and programs of the City.

Tables 6-1, 6-2, 6-3, and 6-4 summarize the existing authorities, policies, programs, and resources to implement mitigation actions and projects.

6.1.1 PLANNING AND REGULATORY CAPABILITIES
Planning and regulatory capabilities include local ordinances, policies, and laws to manage growth and development. Examples include land use plans, capital improvement plans, transportation plans, emergency preparedness and response plans, building codes, and zoning ordinances. These capabilities may be used to inform and support mitigation planning or may be modified as mitigation action. Table 6-1 lists City planning and regulatory capabilities. Under the Description column is an explanation of the City’ s ability to use the LHMP to expand on and improve these existing policies and programs.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 132 –

Table 6-1: Local Planning and Regulatory Capabilities
Name/Version
Date
Hazards
Addressed Description (Effect on Hazard Mitigation)
Antioch Adopted
Budget (2024-
2026)
All City’s Budget

Expansion and Improvement: Future budget will include
hazard mitigation projects as part of the general fund
budget.

Antioch Code of
Ordinances
Multiple Local laws enacted by Antioch, created to address matters of local concern that are not covered by state or federal laws.

The codes itemized below have been adopted and may
have been amended by the City.
• 2022 California Building Code (Volume 1 & 2)
• 2022 California Residential Code
• 2022 California Electrical Code
• 2022 California Mechanical Code
• 2022 California Plumbing Code
• 2022 California Energy Code
• 2022 California Green Building Standards Code
• 2022 California Fire Code

Expansion and Improvement: Ensure ordinances align
with industry standards and look at the implications of adding additional restrictions that improve mitigation City wide.

Capital
Improvement
Program (2024-
2029)
All A compilation of infrastructure and major maintenance projects designed to expand, enhance and/or preserve
the foundation of this great City.

Expansion and Improvement: Future iterations of the
CIP will incorporate hazard mitigation activities.

Capital
Improvement
Program - Water
System
Earthquake,
Drought,
A compilation of infrastructure and major maintenance
projects designed to expand, enhance, and preserve the
water system.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 133 –
Table 6-1: Local Planning and Regulatory Capabilities
Name/Version
Date
Hazards
Addressed Description (Effect on Hazard Mitigation)
Expansion and Improvement: Future iterations of the
plan will ensure projects align with the hazard mitigation activities.

Vision and
Strategic Plan
(2019-2029)
Flooding,
earthquake,
Fire
To provide Antioch an economic development strategic
plan that guides priorities, policies, programs, and
services.

Antioch General
Plan Land Use
Element (2003)
All The Land Use Element designates the general
distribution, location, and extent (including standards for population density and building intensity) of the uses of land for housing, business, industry, agriculture, open space, public facilities, and other categories of public and private uses.

Antioch General
Plan Safety
Element (2003)
Natural
Hazards
Addresses these safety issues, with emphasis on the
naturally occurring conditions that pose a hazard to
Antioch, and provides goals, policies, and programs
aimed at reducing the City’s risk from these hazards.

Expansion and Improvement: Align the HMP with the
future iteration of the Safety Element.

City Urban Water
Management Plan
(UWMP)
Drought,
Climate
Change
The UWMP provides urban water suppliers (including
the City) with a planning document for long-term
resource planning to ensure adequate water supplies
are available to meet existing and future water supply
needs. In addition, the UMWP incorporates water supply
reliability determinations resulting from potentially
prolonged drought, regulatory revisions, and/or changing climatic conditions.

Expansion and Improvement: The UWMP and HMP will
be aligned in describing and developing mitigation
actions to address climate change and drought. Water
demand reduction strategies contained in the UWMP
should be considered for inclusion as mitigation activities in the HMP.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 134 –

6.1.2 ADMINISTRATIVE AND TECHNICAL CAPABILITIES
Administrative and technical capabilities include community (including public and private) staff and their skills and tools that can be used for mitigation planning and implementation. This capability includes engineers, planners, emergency managers, GIS analysts, building inspectors, grant writers, and floodplain managers. Some communities may rely on other government entities such as counties or special City’s for resources. These capabilities may be used when planning mitigation activities to support project feasibility studies, designs, estimates, and construction.

Table 6-2: Administrative and Technical Capabilities
Resource Name Lead
Department Description (Effect on Hazard Mitigation)
Communications City
Manager's
Office
The City’s Public Information Office provides outreach
and information to the public, creative services to all internal departments, and videography for the City; also handles all website administration.

Expansion and Improvement: Strengthen ties with
community organizations and businesses to ensure key
content and information is timely and relevant. Create
additional communications platforms to ensure
information and content reaches community members.

City Clerk's
Office
City
Manager's
Office
The City Clerk supervises and coordinates City
elections; serves as Filing Officer for City appeals as designated by various sections of the Antioch Municipal Code; prepares and updates the City's Conflict of
Interest Code, and serves as Filing Officer for the Fair Political Practices Commission; receives and opens all
sealed bids and formally releases bid bonds; receives,
processes and maintains claims, public record requests, special event applications, summonses and complaints;
assists the public and City staff by providing information and research assistance; and directs the retention and
destruction of official records in accordance with
applicable laws and regulations.

Expansion and Improvement: Prioritize new initiatives
that support mitigation activities within the City.

Building
Inspections
Community
Development
The City Building and Safety Division is responsible for development of ordinances, enforcement of the City’s
zoning and housing and environmental codes. The
Antioch Municipal Code regulates parking on private
property, zoning, property maintenance, weed
abatement on undeveloped lots and other substandard
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 135 –
Table 6-2: Administrative and Technical Capabilities
Resource Name Lead
Department Description (Effect on Hazard Mitigation)
conditions on residential, commercial, and industrial
properties.

Expansion and Improvement: Utilize code compliance as
a means of incorporating mitigation into structures and improvements conducted by residents and businesses.

Engineering
Public Works
The department is charged with overseeing, planning,
designing, and implementation of infrastructure projects.

Some of the department's functions include:

Act as the lead agency for construction and public works contracts within the Right-of- Way.

Program, plan, design and administer the construction of the annual Capital Improvement Program.

Issue encroachment and traffic control permits for any
work within the Right-of-Way.

Expansion and Improvement: Work with Engineering to
identify soft structures within the City boundary and
develop mitigation strategies to make improvements.

Public Works Public Works The City Public Works Department is responsible for maintaining and improving the City's vital infrastructure, including streets, sidewalks, parks, landscaping, sewers, storm drains, public facilities, and water utility. These services include maintenance of public buildings and
facilities, landscaping and park upkeep, street and
sidewalk maintenance and repair, storm drain and sewer
servicing, graffiti abatement, and serve as the City’s
water provider

Expansion and Improvement: Improve the
understanding of the role that daily activities play in hazard mitigation. Develop hazard mitigation projects
that aid in mitigation.

Information
Systems
Information
Systems
The role of the IS Department is to support the
operational departments with reliable systems and
information daily. The most critical support required of IT being network, communications and applications
support. The IS department provides short- and long-
term direction in planning, researching, selecting and
deploying future technologies. IS strives to
accommodate improved business process automation,
self-service and quality customer service through a
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 136 –
Table 6-2: Administrative and Technical Capabilities
Resource Name Lead
Department Description (Effect on Hazard Mitigation)
variety of hardware and software solutions. The IS
Department also leads cybersecurity efforts, including
increasing cybersecurity awareness in staff through
training and assessments, risk assessment of
procurements involving IT systems or technologies,
recommendations for improvements, internal IT audits,
and the development of policies and standards
supporting confidentiality, integrity and availability of information systems.

Expansion and Improvement: Increase system
redundancy and resiliency through improvements to
technologies and connectivity.

Public Safety Police
Department
Antioch Police Department is tasked with protecting life and property while preserving the peace. This
department is responsible for conducting public safety
activities, investigating criminal activity, and directing traffic.

Expansion and Improvement: Provide training to Officers to better enable them to see potential hazards and take action to report them.

Emergency
Management
Police Develops, coordinates, and manages programs that prevent, prepare for, respond to, recover from, and
mitigate natural and human-caused disasters and
emergencies.

Expansion and Improvement: Increase coordination and
collaboration with other City departments, especially
during annual budgeting.

Planning Community
Development
The Community Development Department plays a
critical role in achieving the City Council's goals and objectives related to land use, urban design, and the
quality and sustainability of the built environment.

Expansion and Improvement: Provide opportunities for
continued education to Community Development staff to
maintain state-of-the-art knowledge of new code and
regulatory requirements.

Building Community
Development
The Community Development Department provides
professional plan review and inspection services to
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 137 –
Table 6-2: Administrative and Technical Capabilities
Resource Name Lead
Department Description (Effect on Hazard Mitigation)
ensure buildings and projects are built and developed in compliance with all applicable municipal and state code requirements.

Expansion and Improvement: Provide opportunities for
continued education to Community Development staff to
maintain state-of-the-art knowledge of new code and
regulatory requirements.

Financial
Services
Finance The Finance Department is tasked with maintaining reliable accounting records, payment of approved
demands against the City treasury, financial statement
reporting, preparation of the annual budget, prudent
fiscal planning, payroll processing, and debt
administration.

Expansion and Improvement: Assist with key mitigation
activities associated with cost tracking hazard events
and disasters, identifying grant funding opportunities, grant reporting and administration, and establishing
financial risk calculations that can help assist with
budgeting of operations, maintenance, and capital
improvements.

Human
Resources
Human
Resources
The Human Resources Department plans, coordinates
and administers a comprehensive human resources
management program for the City and its employees.

This includes the recruitment and retention of highly
qualified employees, maintenance of a competitive
employee compensation program, implementation and
use of current technology for the City's human
resources, organizational and employee development,
and employee/labor relations. Identifies, evaluates and manages the City's risk and liability programs. This
includes claims administration, the maintenance of
liability/insurance coverage as well as the compliance
with governmental regulation. In addition, the
department administers the City's workers'
compensation and employee safety programs.

Expansion and Improvement: Increase knowledge and
information through better data collection and tracking.

Floodplain
Manager
Public Works The duties and responsibilities of the Floodplain Administrator shall include, but not be limited to:

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 138 –
Table 6-2: Administrative and Technical Capabilities
Resource Name Lead
Department Description (Effect on Hazard Mitigation)
Permit review
Flood hazard reduction
NFIP program administration
Construction inspections

Expansion and Improvement: The Floodplain
Administrator supports compliance with NFIP
requirements, advocates for appropriate development in
flood hazard areas, and provides technical expertise on effective flood mitigation activities. This can support mitigation activities.

Planning
Commission
Community
Development
Department
The Planning Commission is responsible for reviewing
proposed residential and commercial development
projects, subdivisions, and land use requests on private property, to determine their compliance with applicable City regulations. The Commission has the authority to
approve various development project addition. The
Commission makes recommendations to the City
Council with respect to the City's General Plan, Zoning Code, Specific Plans and other matters related to
development within the City. The Commission may be
responsible for implementing mitigation items pertaining to the Commission's scope.

Expansion and Improvement: Provide opportunities for
continued education to members of the Planning
Commission to maintain state-of-the-art knowledge of
new code and regulatory requirements.

City Attorney City
Manager's
Office
Reviews and approves resolutions and ordinances.

Expansion and Improvement: Provide opportunities for
the City Attorney to review updates to regulatory
information to provide expert review of City resolutions and ordinances that may address hazard mitigation
GIS
Public Works
Department
Provides complex mapping and data management of
City facilities, land use, and potential hazards. Supports visualization of complex data sets using geo-location
and data correlation.

Expansion and Improvement: Acquire and conduct
training for GIS technicians on the latest versions of
ArcGIS.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 139 –

6.1.3 FISCAL CAPABILITIES
Financial capabilities include grants, general funds, property sales, income taxes, development impact fees, or stormwater utility fees. Based on procedures for each resource, these financial resources may be used to support mitigation activities.

Table 6-3: Financial Capabilities
Resource Name Administrator Description (Effect on Hazard Mitigation) Operating Budget

https://www.antioch
ca.gov/fc/finance/A
dopted-Budget-
2023-25.pdf
Department
Specific
Program operations and specific projects.

Consists of property tax, sales tax, transient
occupancy tax, and franchise tax that can be used
for general purposes.

Expansion and Improvement: Hazard mitigation
projects may be considered during the annual
budgeting process for funding from the general
fund.

Community
Development Block
Grants (CDBG)
Fund Specific The CDBG program provides funding for eligible senior activities such as in-home care, art classes,
counseling, and home-delivered meals. Housing
and Urban Development also provides Disaster
Recovery Assistance in the form of flexible grants
to help cities, counties, and States recover from
Presidentially declared disasters, especially in
low-income areas, subject to the availability of
supplemental appropriations.

Expansion and Improvement: Where applicable,
CDBG grants should be used to fund mitigation
projects that enhance the resiliency of low-income
and underserved communities.

Hazard Mitigation
Grant Program
(HMPG)
Emergency
Management
Provides support for pre-and post-disaster
mitigation plans and projects.

Expansion and Improvement: Train staff on notice
of intent (NOI) procedures and track opportunities
on the Cal OES mitigation website to initiate
applications for grant funding.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 140 –
Table 6-3: Financial Capabilities
Resource Name Administrator Description (Effect on Hazard Mitigation) Flood Mitigation
Assistance (FMA)
Grant Program
Grant Funding Mitigates structures and infrastructure that have been repetitively flooded.

Expansion and Improvement: Train staff on notice
of intent (NOI) procedures and track opportunities
on the Cal OES mitigation website to initiate
applications for grant funding.

6.1.4 EDUCATION AND OUTREACH CAPABILITIES
These capabilities include fire safety programs, hazard awareness campaigns, and public information or communications offices. Education and outreach capabilities can be used to inform the public on current and potential mitigation activities.

Table 6-4: Education and Outreach Capabilities
Resource Name City Leads Description (Effect on Hazard Mitigation) Public Information Officer City
Managers
Officer
Develops and delivers outreach and
engagement programs that promote hazard
awareness.

Expansion and Improvement: Provide
additional information to the community
about hazard mitigation activities.

City Web Sites
https://www.antiochca.gov/

Various Provides easily accessed information about
the City. Used for LHMP public outreach
and engagement.

Expansion and Improvement: Use the City
website to provide additional information to
the community about hazard mitigation
activities.

City Social Media Accounts
https://www.facebook.com/cityo
fantiochca/

Various Provides easily accessed information about
the City. Used for LHMP public outreach
and engagement.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 141 –
Table 6-4: Education and Outreach Capabilities
Resource Name City Leads Description (Effect on Hazard Mitigation) https://x.com/antiochcagov

https://www.instagram.com/city
ofantioch/

https://www.youtube.com/chan
nel/UCz2s_HsRRV3L8Ax9Nhw
YHJA
Expansion and Improvement: Use the City
social media platforms to provide additional
information to the community about hazard
mitigation activities.

6.2 National Flood Insurance Program
Participation
The City is a participant in the NFIP, a Federal program enabling property owners in participating communities to purchase insurance as a protection against flood losses in exchange for State and community floodplain management regulations that reduce futu re flood damages. As a participant of the NFIP, Antioch has adopted NFIP minimum floodplain management criteria via local regulation. The City has no properties that fall under the NFIP definition of Repetitive Loss Properties. The City’s Public Works Department oversees NFIP requirements and commitments.

Post incident, the Floodplain Administrator oversees local floodplain ordinances and will implement any substantial improvements/substantial damage provisions of their floodplain management regulations according to Article 20 of the Code of Ordinances of the City of Antioch § 9-4, including:
• Restricting or prohibiting uses which are dangerous to health, safety, and property due to water or erosion hazards or which result in damaging increases in erosion or flood heights or velocities;
• Requiring that uses vulnerable to floods, including facilities which serve such uses, be protected against flood damages at the time of their initial construction; • Controlling the alteration of natural floodplains, stream channels, and natural protective barriers which help accommodate or channel floodwaters; • Controlling filling, grading, dredging, and other development which may increase flood damages; and
• Preventing or regulating the construction of flood barriers which will unnaturally divert floodwaters or which may increase flood hazards in other areas Information on NFIP compliance is presented in Table 6-5.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 142 –
Table 6-5: City of Antioch NFIP Information
CID Community
Name County
Initial
FHBM
Ident
Initial
FIRM
Ident
Current
Adopted
Eff Map
Date Reg-
Emer Date
060026C City of
Antioch
Contra Costa 06/28/74 12/02/80 03/21/17 12/02/80

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 143 –
SECTION 7: MITIGATION STRATEGY
Federal regulations require local mitigation plans to identify goals for reducing long-term vulnerabilities to the identified hazards in the planning area (Section 201.6(c)(3)(i)).

A hazard mitigation plan’s primary focus is the mitigation strategy. It represents the efforts selected by the City to reduce or prevent losses resulting from the hazards identified in the risk assessment. The strategy includes mitigation actions and proje cts to address the risk and vulnerabilities discovered in the risk assessment. The mitigation strategy consists of the following steps:
• Identify and profile hazards and risk within the City • Identify projects and activities that can prevent or mitigate damage and injury to the population and buildings
• Develop a mitigation strategy to implement the mitigation actions • Develop an action plan to prioritize, implement, and administer the mitigation actions • Implement the LHMP mitigation action plan.

A capability assessment was conducted of City authorities, policies, programs, and resources.

Based upon this assessment and the hazard analysis and risk assessment, goals, and mitigation actions were developed. The planning team also developed a process to prioritize, implement, and administer the mitigation actions to reduce risk to existing facilities and new development.

7.1 Hazard Mitigation Statement
The 2025 LHMP represents the City’s commitment to create a safer, more resilient community by taking actions to reduce risk and by committing resources to lessen the effects of hazards on the people and property of the city.

7.2 Hazard Mitigation Goals and Objectives
Mitigation goals are guidelines that represent what the community wants to accomplish through the mitigation plan. Goals are broad statements that represent a long -term, community -wide vision. The planning team reviewed the example goals and objectives fro m the previous LHMP and determined which goals best met the City’s objectives for mitigation. In addition to the overarching hazard mitigation goals, the City worked to develop the strategies aligned with the CIP and other planning mechanisms that relate to hazard mitigation. The 2025 LHMP was revised to focus on the communities’ priorities as they relate to Climate Change, Wild/Urban Fire, and their commitment to involving vulnerable populations to the planning process. Table 7-1 lists the goals for the 2018 LHMP.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 144 –

Table 7-1: Hazard Mitigation Goals
2025 Goals
Goal 1: Protect life and property, and reduce potential injuries from natural, technological, and human-caused hazards
Goal 2: Improve public understanding, support of, and need for hazard mitigation measures Goal 3: Promote disaster resilience for the City’s natural, existing, and future built environment
Goal 4: Strengthen partnerships and collaboration to implement hazard mitigation activities Goal 5: Enhance the City’s ability to effectively and immediately respond to disasters

7.3 Mitigation Actions/Projects and
Implementation Strategy
Mitigation actions are specific activities or projects that serve to meet the goals that the community has identified. Mitigation actions and projects are more specific than goals or objectives and often include a mechanism, such as an assigned timeframe , to measure the success and ensure the actions are accomplished. The planning team conducted a review of the mitigation actions and strategies from the State Hazard Mitigation Plan and from other cities’ planning efforts to develop new mitigation actions and projects to reduce the effects of hazards, with emphasis on new and existing buildings and infrastructure.

The requirements for prioritization of mitigation actions, as provided in the federal regulations implementing the Stafford Act as amended by DMA 2000, are described below.

Based on these criteria, the City prioritized potential mitigation projects and included them in the action plan discussed below in Table 7-2. The action plan developed by the planning team includes the action items that the City intends to implement during the next five (5) years, assuming funding availability. The action plan includes the implementing department, an estimate of the timeline for implementation, and potential funding sources.

7.4 Previous Mitigation Actions/Projects
Assessment
The 2018 HMP contained 21 mitigations actions. Many of the mitigation actions were completed, carried out to some degree, or are considered ongoing. Some of the mitigation actions were duplicative, others were better categorized as emergency preparedness or recovery activities, and CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 145 –
others were either not addressed during the time period or were not feasible to accomplish. Table 7-2 provides the status of mitigation actions from the 2018 HMP.

Table 7-2: 2018 Hazard Mitigation Plan Mitigation Action Status # Mitigation Action
Status (Complete,
Ongoing, Planned,
Not Completed)
1 Construct West Antioch Creek channel improvements, new box culverts, to eliminate property and environmental damage caused by flooding
Completed
2 Finish construction of the Oakley/Trimbath Detention Basin Remove (County Project)
3 Construct Wilbur Avenue Culvert Crossing Ongoing (Added to 2025 Plan)
4 Seismic retrofit the City owned Historical Hard House building. Not Completed (Removed)
5 Construct Water Reservoir Maintenance Improvement projects Not Completed (Removed)
6 Construct Water and Sewer pipeline projects to strengthen systems and to ensure safe and reliable provisions of public water and sewer services
Completed
7 Update Emergency Operations Plan Not Completed
(Removed)
8 Continue to support the implementation, monitoring,
maintenance, and updating of this Plan, as defined in Volume 1 Ongoing (Added to
2025 Plan)
9 Continue to maintain compliance and good standing under the NFIP
Ongoing
10 Consider participation in the CRS Completed
11 Integrate Local Hazard Mitigation Plan into the Safety Element of the General Plan
Completed
12 Where appropriate, support retrofitting, purchase, or relocation of structures In hazard-prone areas to protect structures from future damage, with repetitive loss and sever repetitive loss properties as priority
Ongoing (Added to
2025 Plan)
13 West Antioch Flood Creek Mitigation and Restoration Ongoing (Added to 2025 Plan)
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 146 –
Table 7-2: 2018 Hazard Mitigation Plan Mitigation Action Status # Mitigation Action
Status (Complete,
Ongoing, Planned,
Not Completed)
14 Update Inundation Analysis Ongoing (Added to
2025 Plan)
15 NE Annexation Infrastructure Improvements Ongoing (Added to 2025 Plan)
16 Request FEMA to Update flood Maps Ongoing (Added to
2025 Plan)
17 NE Annexation Infrastructure Improvements Ongoing (Added to 2025 Plan)
18 Study, Design and Implement project for settlement of the Marina and the L Street approach (north of 2nd Street)
Ongoing (Added to
2025 Plan)
19 Participation in the Adapting to Rising Tides Initiative Ongoing (Added to 2025 Plan)
20 implement program to track dates, number of occurrences, monetary damage assessments of disasters
Ongoing (Added to
2025 Plan)
21 Update/Create various Plans such as Emergency
Management, Post-Disaster Recovery, and/or Continuity of Operation
Ongoing (Added to
2025 Plan)

7.4.1 NEW MITIGATION ACTIONS
Mitigation actions are specific activities or projects that serve to meet the goals that the community has identified. Mitigation actions and projects are more specific than goals or objectives and often include a mechanism, such as an assigned time period, to measure the success and ensure the actions are accomplished. The planning team conducted a review of the mitigation actions and strategies from the 2018 HMP. With information from the risk assessment, capability assessment, and status of the actions implemented since the 2018 HMP, the planning team developed 32 new ongoing mitigation actions and projects to reduce the effects of hazards, with emphasis on new and existing buildings and infrastructure.

Table 7-3 lists the initial, potential mitigation actions developed by the planning team. For each mitigation action, the following information is listed: type of mitigation project; hazard(s) addressed, type of development affected by action; and the source of the mitigation project idea

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 147 –
Table 7-3: Potential Mitigation Actions 2025
Goal Action Description Mitigation
Type
Related
Hazards
Implementing
Organizations
Goal 1: Protect
life, property,
and reduce
potential
injuries from
natural caused
hazards
Assess and implement
flexible piping joints at
above-ground storage
reservoirs as appropriate
Prevention Seismic Operations
Goal 2: Improve
public
understanding,
support of, and
need for hazard
mitigation
measures
Continue to promote hazard
mitigation information on all
City social media platforms.

Prevention All Police
Department
Goal 3: Promote
disaster resilience
for the City’s
natural, existing,
and future built
environment
Continue to identify and
ensure that pipe
specifications are
compatible with engineering
and earthquake
specifications
Prevention Seismic Operations
Goal 4: Strengthen
partnerships and
collaboration to
implement hazard
mitigation
activities
Update/Create various
Plans such as Emergency
Management, Post-Disaster
Recovery, and/or Continuity
of Operation, Emergency
Operations Plan.

Response All Operations
Goal 5: Enhance
the City’s ability
to effectively and
immediately
respond to
disasters
Identify funding and acquire
a mobile command and
communications vehicle
Response All Operations

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 148 –

7.4.2 MITIGATION ACTION PLAN
The action plan developed by the planning team includes the action items that the City intends to implement during the next five (5) years, assuming funding availability. The action plan, shown in Table 7-4, includes the implementing department, an estimate of the timeline for implementation, and potential funding sources.

The new mitigation actions include a broad range of approaches to hazard mitigation such as retrofitting, code enforcement, development of new regulations, public education, development of redundant facilities, and others. Measures are included to mitigate risks to existing buildings and infrastructure, as well as new buildings and infrastructure. The mitigation action plan assigns primary responsibility for each of the action items to an implementing department. The implementing department is the controlling departm ent that will assign funding and oversee activity implementation, monitoring, and evaluation.

The planning team does not presume the expertise to prescribe which projects will be implemented. The prioritization of projects in the LHMP is a means to provide a basis for implementing the mitigation strategies, but all new mitigation actions and projects will be formally prioritized and selected by the implementing department. This will accommodate the project funding, schedule of the department, staff requirements, and ability to integrate the new project into existing and ongoing projects. Departments will consider the funding source, the cost - effectiveness of the project, alternative projects, the compatibility of the new project with ongoing projects, the extent to which the project addresses the risks assessed in Section 4, and the potential of economic and social damage.

Prioritization
To assist with implementing the mitigation action plan, the planning team used the following ranking process to provide a method to prioritize the projects for the Action Plan. Designations of High, Medium, and Low priorities have been assigned to each action item using the following criteria.

Does the action Solve the problem?
Address vulnerability assessment?
Reduce the exposure or vulnerability to the highest priority hazard? Address multiple hazards?
Offer benefits that equal or exceed costs?
Implement a goal, policy, or project identified in the General Plan or Capital Improvement Plan?
Can the action Be implemented with existing funds?
Be implemented by existing state or federal grant programs? CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 149 –
Be completed within the five(5)-year life cycle of the LHMP? Will the action Be implemented with currently available technologies? Be accepted by the community?
Be supported by community leaders?
Adversely affect segments of the population or neighborhoods? Require a change in local ordinances or zoning laws?
Result in a positive or neutral impact on the environment? Comply with all local, state, and federal environmental laws and regulations? Is there Sufficient staffing to undertake the project?
Existing authority to undertake the project?
Each positive response is equal to one point. Answers to the criteria above determined the priority according to the following scale:
1–6 = Low priority 7–12 = Medium priority 13–18 = High priority Benefit-Cost Analysis
Conducting benefit/cost analysis for a mitigation activity can assist the City in determining whether a project is worth undertaking now in order to avoid disaster-related damages later. Cost- effectiveness analysis evaluates how to best spend a given amount of money to achieve a specific goal. Determining the economic feasibility of mitigating hazards can provide decision-makers with an understanding of the potential benefits and costs of an activity, as well as a basis for comparing alternative projects.

Funding
The funds required to implement the mitigation action plan will come from a variety of sources, including Federal Hazard Mitigation Grants, City budget, bonds, fees and assessments, and others. Some projects are (or will be) included in capital improvement budgets, while some, especially ongoing projects, are included in department operating budgets.

Prior to beginning a project or when federal funding is involved, the implementing department will use a FEMA approved benefit/cost analysis approach to identify the actual costs and benefits of implementing these mitigation actions. For non-structural projects, implementing departments will use other appropriate methods to weigh the costs and benefits of each action item and then develop a prioritized list.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 150 –
Implementation
Mitigation projects were assigned one of three (3) categories as a tentative schedule for implementation: short -range, mid -range, and long -range. Projects that are currently being implemented by various departments are assigned to the ongoing category. Imp lementation of short-range projects will typically begin within the next three (3) years. Mid-range projects will require some planning and likely require funding beyond what is currently allocated to the various departments in the City’s Operations and Maintenance budget. Projects in the mid-range category will generally begin implementation in the next three (3) to five (5) years. Long-range projects will require great planning and funding and will generally begin implementation within five (5) years and beyond.

7.5 Incorporation into Other Plans
The 2021 LHMP was integrated into the following other planning mechanisms.

The City EOP contains a list of hazards. The LHMP provides a similar, more detailed description of these hazards. Updates to the 2021 LHMP informed revisions to the EOP hazard analysis.

The American Water Infrastructure Act Risk required Risk and Resiliency Assessment (RRA) and the LHMP both should use the same source data and similar language to describe hazards that are contained in both. Hazard analysis and risk/vulnerability updates to one document should be reviewed for inclusion in both. For the 2021 LHMP, the planning team used portions of the RRA to develop new mitigations actions.

The City also included several mitigation actions to address facility improvement and resiliency.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 151 –

Table 7-4: Mitigation Action Implementation Plan - Multiple Hazards #
New
/Carried
Over
Mitigation Action Funding
Sources
Responsible
Department
Relative
Cost*
Time
Frame Priority
1 Carried
Over
Construct Wilbur Avenue Culvert Crossing
(Hazards addressed: Flooding)
General
Fund HMGP
Grants
Public Works $$$ 2 years Medium
2 Carried
Over
Where appropriate, support retrofitting, purchase,
or relocation of structures In hazard-prone areas to
protect structures from future damage, with
repetitive loss and sever repetitive loss properties
as priority.
(Hazards addressed: Earthquake, Flooding)
General
Fund,
HMPG
Grants
Public Works $$$ 5 years Medium
3 Carried
Over
West Antioch Flood Creek Mitigation and
Restoration
(Hazards addressed: Flooding)
General
Fund HMGP
Grants
Public Works $$ 2 years Low
4 Carried
Over
Update Inundation Analysis
(Hazards addressed: Flooding)
General
Fund HMGP
Grants
Planning $ 1 years Low
5 Carried
Over
NE Annexation Infrastructure Improvements
(Hazards addressed: Earthquake, Flooding,
Wildfire)
General
Fund HMGP
Grants
Public Works $$ 2 years High
6 Carried
Over
Request FEMA to Update flood Maps
(Hazards addressed: Flooding)
General
Fund HMGP
Grants
Planning $ 1 years Medium
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 152 –
Table 7-4: Mitigation Action Implementation Plan - Multiple Hazards #
New
/Carried
Over
Mitigation Action Funding
Sources
Responsible
Department
Relative
Cost*
Time
Frame Priority
7 Carried
Over
Study, Design and Implement project for settlement
of the Marina and the L Street approach (north of
2nd Street).
(Hazards addressed: Flooding)
General
Fund/
HMGP
Grants
Planning/
Public Works
$ 3 years Low
8 Carried
Over
Participation in the Adapting to Rising Tides
Initiative
(Hazards addressed: Flooding)
General
Fund
/HMGP
Grants
Planning $ 1 years Low
9 Carried
Over
Implement program to track dates, number of
occurrences, monetary damage assessments of
disasters.
(Hazards addressed: All)
General
Fund/
HMGP
Grants
Finance $ 2 years Medium
10 Carried
Over
Update/Create various Plans such as Emergency
Management, Post-Disaster Recovery, and/or
Continuity of Operation, Emergency Operations
Plan.
(Hazards addressed: All)
General
Fund\
HMGP
Grants
Police, Finance $$ 5 years High
11 New Develop and maintain programs that ensure the
early detection of new invasive species and
monitor existing Aquatic Invasive Species.

(Hazards addressed: Aquatic Invasive Species)
General
Fund
/HMGP
Grants

Public Works $ 2 years Medium
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 153 –
Table 7-4: Mitigation Action Implementation Plan - Multiple Hazards #
New
/Carried
Over
Mitigation Action Funding
Sources
Responsible
Department
Relative
Cost*
Time
Frame Priority
12 New Upgrade power and water facilities, to include
reservoirs, to improve resiliency due to power loss,
flooding, and seismic activity.
(Hazards addressed: Power Outage, Extreme
Heat)
General
Fund/
HMGP
Grants
Public Works $$$ 2 Years High
13 New Develop a Public Outreach Plan geared towards
providing hazard education, emergency
management, and mitigation action activities.

Create and Integrate hazard mitigation material
into public safety information and training programs
(e.g. Community Emergency Response Team
Program).

(Hazards addressed: All)
General
Fund/
HMGP
Grants
Police $ 1 Year Low
14 New Continue to support the implementation,
monitoring, maintenance, and updating of the
LHMP.

(Hazards addressed: All)
General
Fund
/HMGP
Grants

Police
$ 1 Year Low
15 New Develop a policy to ensure the City’s Building
Codes are reviewed annually to reflect changes
and best practices in hazard science.

(Hazards Addressed: Flood, Earthquake).

General
Fund
/HMGP
Grant
Planning $ 3 years Medium
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 154 –
Table 7-4: Mitigation Action Implementation Plan - Multiple Hazards #
New
/Carried
Over
Mitigation Action Funding
Sources
Responsible
Department
Relative
Cost*
Time
Frame Priority
16 New Integrate climate change mitigation and adaptation information and analysis into future LHMP updates
and others.

(Hazards addressed: Climate Change)
General
Fund
/HMGP
Grants

Fire
$ Ongoing
- Yearly
High
17 New Implement measures to bolster local water supply to meet demand, create a sustainable water
supply, while meeting environmental mandates.

(Hazards addressed: Drought)
General
Fund
/HMGP
Grants
Public Works $$$ 3 years High
18 New Implement and enforce the soft story retrofit
ordinance.

(Hazards addressed: Seismic)
General
Fund,
HMGP
Grants
Planning $ 2 years Medium
19 New Conduct an educational campaign, incentivize and promote medium-scale seismic retrofits, such as
window films to minimize shattering, anchors for
rooftop-mounted equipment, bracing for masonry
chimneys, and other preventative measures to
reduce damage to private buildings.

(Hazards addressed: Seismic)
General
Fund
/HMGP
Grants
Planning $ 2 years Medium
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 155 –
Table 7-4: Mitigation Action Implementation Plan - Multiple Hazards #
New
/Carried
Over
Mitigation Action Funding
Sources
Responsible
Department
Relative
Cost*
Time
Frame Priority
20 New Develop a Landslide Management Plan that
identifies areas at risk and mitigation strategies and
develop a policy to ensure the annual review of
potential landslide areas in the City.

(Hazards addressed: Landslide)
General
Fund
/HMGP
Grants
Fire/
Planning/
Public Works
$ 5 years Low
21 New Conduct a seismic analysis of all City-owned key facilities and retrofit vulnerable facilities.

(Hazards addressed: Seismic)
General
Fund/
HMGP
Grants
Public Works $ Ongoing
- yearly
High
22 New Initiate a program to schedule installation of
resilient (seismically appropriate) piping for new or
replacement water distribution pipelines.

(Hazards addressed: Seismic)
General
Fund
/HMGP
Grants
Public Works $$$$ Ongoing
- Yearly
High
23 New Identify and retrofit key critical facilities with seismically rated window film treatments that
ensure glass windows do not shatter during a
strong seismic event.

(Hazards addressed: Seismic)
General
Fund/
HMGP
Grants
Planning/
Public Works
$$ 5 years High
24 New Retrofit roadway medians to capture stormwater
during rain events. Prioritize improvements along
major arterials/ roadways throughout the City.

(Hazards addressed: Flood)
General
Fund
/HMGP
Grants
Public Works $$$ 4 years Medium
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 156 –
Table 7-4: Mitigation Action Implementation Plan - Multiple Hazards #
New
/Carried
Over
Mitigation Action Funding
Sources
Responsible
Department
Relative
Cost*
Time
Frame Priority
25 New Remove or trim trees determined to be susceptible to blowing over during a severe wind event and
underground power lines, where feasible.

(Hazards addressed: High Winds, Severe
Rainstorm)
General
Fund/
HMGP
Grants
Parks/
Public Works
$ 1 Year Medium
26 New Conduct regular fuel modification projects to
reduce fire hazard risks, such as clearing out dead
vegetation in parks, open spaces, right-of-way
embankments, and other areas that could become
fuel for fires.

(Hazards addressed: Wildfire)
General
Fund HMGP
Grants
Fire/Public Works $ 1 Year High
27 New Adopt a wildfire mitigation ordinance to limit the use and development of wildfire hazard areas to
mitigate risk to life and property.

(Hazards addressed: Wildfire)
General
Funds
Fire $ 2 years High
28 New Identify Dam inundation threats to the City and
implement an early warning system/protocol that
notifies downstream communities in the event of a
potential dam failure incident.
(Hazards addressed: Dam Inundation)
General
Fund /
HMGP
Grants
Public Works $ 2 years Low
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 157 –
Table 7-4: Mitigation Action Implementation Plan - Multiple Hazards #
New
/Carried
Over
Mitigation Action Funding
Sources
Responsible
Department
Relative
Cost*
Time
Frame Priority
29 New Continuously inspect businesses and other
properties storing hazardous materials and create
an inventory of storage locations that require
updates, maintenance, or renovation.

(Hazards addressed: Hazardous Materials)
General
Fund
/HMGP
Grants
Fire $ Ongoing
- Yearly
Medium
30 New Establish and provide annual cyber-security risk briefings to City officials. Leverage the Department
of Homeland Security’s State, Local, Tribal, and
Territorial Cyber security engagement programs.

(Hazards addressed: Cyber Attack)
General
Fund
/HMGP
Grants
IT $ 2 years High
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 158 –
SECTION 8: PLAN MAINTENANCE

PROCEDURES
Implementation and maintenance of the plan is critical to the overall success of hazard mitigation planning. This section details the process that the City will use to monitor, update, and evaluate the plan within the five (5)-year cycle of the plan’s revision to ensure the LHMP remains an active and relevant document. The format of the plan aligns with the regulation checklist and is divided into sections of information. When it is time to maintain or revise the LHMP, data can be easily located and incorporated, resulting in an easy method to keep the plan current and relevant.

8.1 Monitoring and Evaluation
The planning team represents City staff from each department and other stakeholders that contributed to the development of the 2020 plan. The planning team oversaw the development of the plan and made recommendations on key elements of the plan, including the maintenance strategy.

It was important to the City that each department be represented in the planning team and given the opportunity to provide input during the plan development. This philosophy will be continued for future plan revisions through evaluations, maintenance, and updates of data, processes, and programs. The planning team will include representation from residents, citizen groups, and stakeholders within the planning area. The Planning Team will meet quarterly to review implementation status of Mitigation P rojects and the information in the plan. The Police Department Captain, which oversees plan development, will oversee the convening of the Planning Team. If planning team members can no longer serve on the planning team, the Department Director will assign another staff person to be on the planning team so that every City department is represented.

The effectiveness of the plan will be measured by ensuring Mitigation Projects are completed in a timely manner while ensuring that the hazard is effectively mitigated Additionally, if the hazard were to affect the City, the planning team will evaluate the effectiveness of the mitigation measure and conduct any needed improvements based on the impacts. The Police Department Captain will oversee the plans effectiveness . This process will be done in conjunction with the quarterly review and implementation of the plan.

8.2 Plan Update
Section 201.6.d.3 of 44CFR requires that local hazard mitigation plans be reviewed, revised as appropriate, and resubmitted for approval in order to remain eligible for benefits awarded under the Disaster Mitigation Act. The City intends to update its hazard mitigation plan on a five(5)-year cycle. The next update will begin starting April of 2028 and will be led by a Police Captain.

Based on needs identified by the planning team, the update will, at a minimum, include the following elements:

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 159 –
• The hazard risk assessment will be reviewed and updated using the most recent information and technologies
• The action plan will be reviewed and revised to account for any initiatives completed, dropped, or changed and to account for changes in the risk assessment • Any new City policies identified under other planning mechanisms, as appropriate • The draft LHMP update will be sent to appropriate agencies and organizations for comment
• The public will be given an opportunity to comment on the updated version prior to adoption
• The City Council will adopt the updated plan.

At a minimum of six (6) months before the expiration date of the 2025 LHMP, the planning team will implement a plan revision schedule to formally update the 2025 plan. The plan will be revised using the latest FEMA hazard mitigation guidance documents, suc h as the Mitigation Planning Tool and Regulation Checklist, to ensure compliance with current hazard mitigation planning regulations.

8.3 Continued Public Involvement
The overall success of the LHMP is through implementation of the plan’s hazard mitigation strategy and activities to reduce the effects of hazards, protect people and property, and improve the City’s efforts to respond to and recover from disasters. Members of the public and the City will ultimately benefit from the implementation of the LHMP and must be given the opportunity to provide input to the continuous cycle of LHMP planning.

The City will strive to keep the public aware of hazard mitigation projects that take place as a result of the LHMP. Public information will be released through press releases, City website announcements, public hearings as required, council meetings, social media, and press releases.

Projects that mitigate hazards are included in the City’s annual budget planning process. The public is made aware of the planning through City Council meetings and press releases during this time. The budget planning process will serve as an annual opport unity to conduct outreach to the public on updates to the hazard mitigation planning process.

A survey can be conducted to gather input on how the community feels about the progress being made on LHMP activities. The City will also provide press releases and information about hazard mitigation projects to the public regularly. At a minimum, the public will be engaged to learn about current LHMP activities and given the opportunity to provide comments and information on an annual basis to update and maintain the LHMP. The Management Analyst tasked with public outreach will be responsible for ensuring the public is included and involved in the annual public plan update and outreach.

When the time comes to begin revising the 202 5 LHMP, the plan update process will be implemented, which will include continued public involvement and input through attendance at designated public meetings, web postings, through press releases to local media, community CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 160 –
fairs, and events, and surveys. As part of this effort, a series of public meetings will be held, and public comments will be solicited on the revisions to the LHMP according to the five(5)-year cycle.

Table 8-1 summarizes successful public involvement efforts previously conducted by the City, as well as proposed activities for public involvement and dissemination of information that shall be pursued whenever possible and appropriate.

Table 8-1: Past and Proposed Continued Public Involvement Activities or Opportunities Identified by the City
Department
Public Involvement Activity or Opportunity
Past Proposed
Administration LHMP Survey was conducted
online and given out at City
events in person.

Conduct annual surveys to be
completed online and at the annual
Public Safety Event.

All Place more emphasis on the risks
associated with natural and manmade
hazards at public awareness
campaigns conducted by various City
departments. Consider developing
and distributing public education
materials for natural hazards.

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 161 –
APPENDIX A – LOCAL MITIGATION PLAN

REVIEW TOOL

[Will be added prior to submission to the State]

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 162 –
APPENDIX B – PLANNING TEAM MEETING

DOCUMENTATION
Appendix B contains documentation of the planning process for the LHMP Planning Team, including meetings, presentations, emails, etc.

Date Activity Documentation
11/21/2024 Project Kick-off Meeting Documentation 1: Presentation (cover only) Documentation 2: Meeting minutes
1/9/2025 Planning Team Meeting 2 Documentation 3: Meeting minutes

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 163 –
DOCUMENTATION 1: KICKOFF MEETING PRESENTATION (COVER SLIDE)

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 164 –
DOCUMENTATION 2: KICKOFF MEETING NOTES

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 165 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 166 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 167 –
DOCUMENTATION 3: MEETING NOTES

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 168 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 169 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 170 –
APPENDIX C – PUBLIC ENGAGEMENT

DOCUMENTATION
Appendix C contains documentation of the planning process including meetings, presentations held for the stakeholders and public, and other stakeholder/public outreach efforts.

Date Activity Documentation
November 19,
2024 - Present
Survey posted on City Website
with links provided in social
media accounts. General Hazard
Mitigation documents.

Documentation 1 – Public
Survey/Results
Documentation 2 – City Website
Documentation 3 – Press Release
Documentation 4 – Social Media Post
Documentation 5 – Community Event
Documentation 6 – Hazard Mitigation
Flyer

October 30,
2025
Draft LHMP provided for public
review.

Documentation 7: Social Media Posts
October 15,
20205
Draft LHMP provided to
neighboring jurisdiction for review
and comment.

Documentation 8: Neighboring
Jurisdictions LHMP Review Email

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 171 –
DOCUMENTATION 1: PUBLIC SURVEY

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 172 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 173 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 174 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 175 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 176 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 177 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 178 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 179 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 180 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 181 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 182 –
DOCUMENTATION 2: CITY WEBSITE

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 183 –
DOCUMENTATION 3: PRESS RELEASE

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 184 –
DOCUMENTATION 4: SOCIAL MEDIA POSTS

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 185 –
DOCUMENTATION 5: COMMUNITY EVENT

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 186 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 187 –
DOCUMENTATION 6: HAZARD MITIGATION FLYER

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 188 –
DOCUMENTATION 7: SOCIAL MEDIA POSTS

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 189 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 190 –
DOCUMENTATION 8: NEIGHBORING JURISDICTIONS LHMP REVIEW EMAILS

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 191 –

CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 192 –
APPENDIX D – ACRONYMS AND

ABBREVIATIONS

Acronym Definition
AEP Annual Exceedance Probability
APG Adaptation Planning Guide
AIS Aquatic Invasive Species
BAAQMD Bay Area Air Quality Management District
CAL FIRE California Fire Protection
Cal OES California Governor’s Office of Emergency Services CARB California Air Resource Board
CBSC California Building Standards Commission
CCC HMP Contra Costa County Hazard Mitigation Plan
CCFCWCD Contra Costa Flood Control and Water Conservation District CCHSHMP Contra Costa Health Services Hazardous Materials Programs CDAA California Disaster Assistance Act
CDBG Community Development Block Grants
CDC California Department of Conservation
CEQA California Environmental Quality Act
CF Critical facilities
CFR Code of Federal Regulations
CIP Capital Improvement Plan
CPRI Calculated Priority Risk Index
CPUC California Public Utilities Commission
CRS Community Rating System
CUPA Certified Unified Program Agency
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 193 –
Acronym Definition
DMA 2000 Disaster Mitigation Act of 2000
DSOD Division of Safety of Dams
ENSO El Niño-Southern Oscillation
EO Executive Order
EOP Emergency Operations Plan
EPA Environmental Protection Agency
FBI Federal Bureau of Investigation
FEMA Federal Emergency Management Agency
FIRMs Flood Insurance Rate Maps
FMA Flood Mitigation Assistance
FOC Facilities of Concern
GHG Greenhouse Gas
GIS Geographic Information System
HMGP Hazard Mitigation Grant Program
HMP Hazard Mitigation Plan
LHMP Local Hazard Mitigation Plan
LRA Local Responsibility Area
LSAC Levee Safety Action Classification
MMI Modified Mercalli Intensity
MW Maximum Earthquake Potential
Mw Moment Magnitude
NFIP National Flood Insurance Program
NIDIS National Integrated Drought Information System
NOI Notice of Intent
NWS National Weather Service
CITY OF ANTIOCH 2025 Local Hazard Mitigation Plan

– 194 –
Acronym Definition
PSDI Palmer Drought Severity Index
PSPS Public Safety Power Shutoffs
RFC Repetitive Flood Claims
RL Repetitive Loss
RRA Risk and Resiliency Assessment
SHMP State Hazard Mitigation Plan
SRL Several Repetitive Loss
STAPLEE Social, Technical, Administrative, Political, Legal, Economic, Environmental USACE U.S. Army Corps of Engineers
UCERF3 (The Third) Uniform California Earthquake Rupture Forecast USDM U.S. Drought Monitor
USGS U.S. Geological Survey
USSDO U.S. Seasonal Drought Outlook
UWMP Urban Water Management Plan
VHFHSZ Very High Fire Hazard Severity Zones
WGCEP Working Group on California Earthquake Probabilities WUI Wildland Urban Interface

U.S. Department of Homeland Security
FEMA Region 9
1111 Broadway, Suite 1200
Oakland, CA 94607-4052

www.fema.gov

May 1, 2026

Desmond Bittner
Police Captain
Antioch Police Department
300 L Street
Antioch, CA 94509

Reference: Hazard Mitigation Plan Approvable Pending Adoption City of Antioch, CA

Dear Desmond Bittner:

The Federal Emergency Management Agency (FEMA) has completed its review of the 2025 City of Antioch Hazard Mitigation Plan and has determined that the plan is eligible for final approval, pending its formal adoption by the City of Antioch.

Formal adoption documentation must be submitted to FEMA Region 9 within one calendar year from the date of this letter. If the adoption is not received within that timeframe, the plan must be updated and resubmitted for review.

FEMA will issue formal approval of the plan upon receipt of the adoption documentation.

Adoption of the plan is required to maintain eligibility for funding under FEMA’s Hazard Mitigation Assistance (HMA) programs. All funding requests will be evaluated individually based on the specific eligibility criteria and requirements of the applicable HMA program.

Please note that while local hazard mitigation plans may include additional content to meet Element H: Additional State Requirements or other local objectives, FEMA’s Approvable Pending Adoption (APA) status does not constitute review or approval of any content exceeding FEMA’s standard mitigation planning requirements.

If you have any questions regarding the planning or review processes, please contact the FEMA Region 9 Hazard Mitigation Planning Team at [email protected].

Sincerely,

Alison Kearns
Planning and Implementation Branch Chief
Mitigation Division
FEMA Region 9
City of Antioch Hazard Mitigation Plan Approvable Pending Adoption Notice May 1, 2026

Page 2 of 2 ends

Antioch City CouncilJune 9, 2026

Antioch City Council
June 9, 2026