Exhibit J - PWQMP.pdf — Rialto City Council, February 28, 2023

Water Quality Management Plan
For:

Golden Land
APN 1133-081-01 & 1133-081-02

Prepared for:

Ken Jackson
809 Echelon Ct.

La Puente, Ca 91744
949-707-0035 Ph.

Prepared by:

Sake Engineers Inc.
400 S. Ramona Ave. Ste. 202
Corona, Ca 92879
(951) 279-4041 Ph.

Submittal Date: 2-24-2022
Revision Date: Insert Current Revision Date
Approval Date:_____________________
Water Quality Management Plan (WQMP)

Owner’s Certification
Project Owner’s Certification

This Water Quality Management Plan (WQMP) has been prepared for Ken Jackson by Sake Engineers Inc..

The WQMP is intended to comply with the requirements of the City of Rialto and the NPDES Area wide Stormwater Program requiring the preparation of a WQMP. The undersigned, while it owns the subject property, is responsible for the implementation of the provisions of this plan and will ensure that this plan is amended as appropriate to reflect up-to-date conditions on the site consistent with San Bernardino County’s Municipal Storm Water Management Program and the intent of the NPDES Permit for San Bernardino County and the incorporated cities of San Bernardino County within the Santa Ana Region.

Once the undersigned transfers its interest in the property, its successors in interest and the city/county shall be notified of the transfer. The new owner will be informed of its responsibility under this WQMP. A copy of the approved WQMP shall be available on the subject site in perpetuity.

“I certify under a penalty of law that the provisions (implementation, operation, maintenance, and funding) of the WQMP have been accepted and that the plan will be transferred to future successors.” Project Data
Permit/Application
Number(s): PPD2018-0102 Grading Permit Number(s): PPD2018-0102 Tract/Parcel Map
Number(s): Building Permit Number(s):

CUP, SUP, and/or APN (Specify Lot Numbers if Portions of Tract): APN 1133-081-01 & 1133-081-02 Owner’s Signature
Owner Name: Ken Jackson
Title Owner
Company
Address 809 Echelon Ct. La Puente, Ca 91744
Email [email protected]
Telephone # (949) 707-0035 Ph.

Signature Date

Water Quality Management Plan (WQMP)

Contents

Preparer’s Certification

“The selection, sizing and design of stormwater treatment and other stormwater quality and quantity control measures in this plan were prepared under my oversight and meet the requirements of Regional Water Quality Control Board Order No. R8-2010-0036.”

Engineer: SamAkbarpour PE Stamp Below

Title Civil Engineer
Company Sake Engineers Inc.

Address 400 S. Ramona Ave. Ste. 202 Corona, Ca 92879
Email [email protected]
Telephone # (951) 279-4041 Ph.

Signature

Date 2-24-2022

Water Quality Management Plan (WQMP)

Contents ii

Table of Contents
Section 1 Discretionary Permits ......................................................................................... 1-1 Section 2 Project Description ............................................................................................... 2-1

2.1 Project Information ........................................................................................ 2-1

2.2 Property Ownership / Management .............................................................. 2-2

2.3 Potential Stormwater Pollutants ................................................................... 2-3

2.4 Water Quality Credits ........ ……………………………………………………………………………. 2-4 Section 3 Site and Watershed Description ......................................................................... 3-1 Section 4 Best Management Practices ................................................................................ 4-1

4.1 Source Control BMP ....................................................................................... 4-1

4.1.1 Pollution Prevention ................................................................................... 4-1

4.1.2 Preventative LID Site Design Practices ....................................................... 4-6

4.2 Project Performance Criteria......................................................................... 4-7

4.3 Project Conformance Analysis ....................................................................... 4-12

4.3.1 Site Design Hydrologic Source Control BMP .............................................. 4-14

4.3.2 Infiltration BMP .......................................................................................... 4-16

4.3.3 Harvest and Use BMP .................................................................................. 4-18

4.3.4 Biotreatment BMP....................................................................................... 4.19

4.3.5 Conformance Summary ............................................................................... 4-23

4.3.6 Hydromodification Control BMP ............................................................... 4-24

4.4 Alternative Compliance Plan (if applicable) ................................................. 4-25 Section 5 Inspection & Maintenance Responsibility Post Construction BMPs ................. 5-1 Section 6 Site Plan and Drainage Plan ................................................................................ 6-1

6.1. Site Plan and Drainage Plan.......................................................................... 6-1

6.2 Electronic Data Submittal ............................................................................. 6-1

Forms
Form 1-1 Project Information ............................................................................................... 1-1 Form 2.1-1 Description of Proposed Project ......................................................................... 2-1 Form 2.2-1 Property Ownership/Management ..................................................................... 2-2 Form 2.3-1 Pollutants of Concern ......................................................................................... 2-3 Form 2.4-1 Water Quality Credits ......................................................................................... 2-4 Form 3-1 Site Location and Hydrologic Features ................................................................. 3-1 Form 3-2 Hydrologic Characteristics .................................................................................... 3-2 Form 3-3 Watershed Description .......................................................................................... 3-3 Form 4.1-1 Non-Structural Source Control BMP ................................................................... 4-2 Form 4.1-2 Structural Source Control BMP .......................................................................... 4-4 Form 4.1-3 Site Design Practices Checklist ........................................................................... 4-6 Form 4.2-1 LID BMP Performance Criteria for Design Capture Volume ............................. 4-7 Form 4.2-2 Summary of HCOC Assessment .......................................................................... 4-8 Form 4.2-3 HCOC Assessment for Runoff Volume ............................................................... 4-9 Form 4.2-4 HCOC Assessment for Time of Concentration .................................................. 4-10 Water Quality Management Plan (WQMP)

Contents iii

Form 4.2-5 HCOC Assessment for Peak Runoff .................................................................... 4-11 Form 4.3-1 Infiltration BMP Feasibility ................................................................................ 4-13 Form 4.3-2 Site Design Hydrologic Source Control BMP ..................................................... 4-14 Form 4.3-3 Infiltration LID BMP ........................................................................................... 4-17 Form 4.3-4 Harvest and Use BMP ......................................................................................... 4-18 Form 4.3-5 Selection and Evaluation of Biotreatment BMP ................................................ 4-19 Form 4.3-6 Volume Based Biotreatment – Bioretention and Planter Boxes w/Underdrains 4-20 Form 4.3-7 Volume Based Biotreatment- Constructed Wetlands and Extended Detention 4-21 Form 4.3-8 Flow Based Biotreatment ................................................................................... 4-22 Form 4.3-9 Conformance Summary and Alternative Compliance Volume Estimate .......... 4-23 Form 4.3-10 Hydromodification Control BMP ..................................................................... 4-24 Form 5-1 BMP Inspection and Maintenance ........................................................................ 5-1

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Water Quality Management Plan (WQMP)

1-1

Section 1 Discretionary Permit(s)
Form 1-1 Project Information
Project Name Golden Land
Project Owner Contact Name: Ken Jackson
Mailing
Address: 809 Echelon Ct., La Puente, Ca 91744 E-mail
Address:

KJackson@camfieldpartner
s.com Telephone:
949-707-0035
Permit/Application Number(s): PPD2018-0102 Tract/Parcel Map Number(s): N/A
Additional Information/
Comments:

Description of Project:

Proposed project is a warehouse that includes an office (3,048 sf), warehouse (56,378 sf). Also included is a parking lot. The site is approximately 123,737 sf (2.84 ac) in size, which will be developed into 104,290 SF (84%) impervious and 19,447 SF (16%) pervious. The site has 3 DA’s as shown on the WQMP site plan. DA1 area will discharge to 2 infiltration basin with one 48” pipe under to basin bottom. DA2 area will discharge to one infiltration basin with one 36” pipe under to basin bottom. DA3 area will discharge to one infiltration basin with three 48” pipe under to basin bottom, then will discharge via curb drain out to Locust Ave. for overflow.

Provide summary of Conceptual
WQMP conditions (if previously
submitted and approved). Attach
complete copy.

N/A

Water Quality Management Plan (WQMP)

2-1

Section 2 Project Description

2.1 Project Information
This section of the WQMP should provide the information listed below. The information provided for Conceptual/ Preliminary WQMP should give sufficient detail to identify the major proposed site design and LID BMPs and other anticipated water quality features that impact site planning. Final Project WQMP must specifically identify all BMP incorporated into the final site design and provide other detailed information as described herein.

The purpose of this information is to help determine the applicable development category, pollutants of concern, watershed description, and long term maintenance responsibilities for the project, and any applicable water quality credits. This information will be used in conjunction with the information in Section 3, Site Description, to establish the performance criteria and to select the LID BMP or other BMP for the project or other alternative programs that the project will participate in, which are described in Section 4.

Form 2.1-1 Description of Proposed Project
1 Development Category (Select all that apply):

Significant re-development
involving the addition or
replacement of 5,000 ft2 or
more of impervious surface on
an already developed site
New development involving
the creation of 10,000 ft2 or
more of impervious surface
collectively over entire site
Automotive repair
shops with standard
industrial classification (SIC)
codes 5013, 5014, 5541,
7532- 7534, 7536-7539
Restaurants (with SIC
code 5812) where the land
area of development is
5,000 ft2 or more
Hillside developments of
5,000 ft2 or more which are
located on areas with known
erosive soil conditions or
where the natural slope is
25 percent or more
Developments of 2,500 ft2
of impervious surface or more
adjacent to (within 200 ft) or
discharging directly into
environmentally sensitive areas
or waterbodies listed on the
CWA Section 303(d) list of
impaired waters.

Parking lots of 5,000 ft2
or more exposed to storm
water
Retail gasoline outlets
that are either 5,000 ft2 or
more, or have a projected
average daily traffic of 100
or more vehicles per day
Non-Priority / Non-Category Project May require source control LID BMPs and other LIP requirements. Please consult with local jurisdiction on specific requirements.
2 Project Area (ft2): 123,737 3 Number of Dwelling Units: 0 4 SIC Code: 1541 5 Is Project going to be phased? Yes No If yes, ensure that the WQMP evaluates each phase as a distinct DA, requiring LID BMPs to address runoff at time of completion.
6 Does Project include roads? Yes No If yes, ensure that applicable requirements for transportation projects are addressed (see Appendix A of TGD for WQMP)
Water Quality Management Plan (WQMP)

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2.2 Property Ownership/Management
Describe the ownership/management of all portions of the project and site. State whether any infrastructure will transfer to public agencies (City, County, Caltrans, etc.) after project completion. State if a homeowners or property owners association will be formed and be responsible for the long-term maintenance of project stormwater facilities. Describe any lot-level stormwater features that will be the responsibility of individual property owners.

Form 2.2-1 Property Ownership/Management
Describe property ownership/management responsible for long-term maintenance of WQMP stormwater facilities:

The maintenance of the proposed development and BMPs are the responsibility of the owner. There is no homeowner or property owner’s association set up for this proposed development. No infrastructure will transfer to public agencies after project completion.

Ken Jackson
809 Echelon Ct.

La Puente, Ca 91744
949-707-0035 Ph.

Water Quality Management Plan (WQMP)

2-3

2.3 Potential Stormwater Pollutants
Determine and describe expected stormwater pollutants of concern based on land uses and site activities (refer to Table 3-3 in the TGD for WQMP).

Form 2.3-1 Pollutants of Concern
Pollutant
Please check:

E=Expected, N=Not
Expected
Additional Information and Comments
Pathogens (Bacterial / Virus) E N Car and truck use
Nutrients - Phosphorous E N Landscape maintenance areas and runoff.

Nutrients - Nitrogen E N Landscape maintenance areas and runoff.

Noxious Aquatic Plants E N Landscape maintenance areas and runoff.

Sediment E N Landscape maintenance and parking lot debris Metals E N Car and truck use
Oil and Grease E N Car and truck use
Trash/Debris E N Landscape maintenance and parking lot debris Pesticides / Herbicides E N Landscape runoff.

Organic Compounds E N Vehicle and landscape maintenance areas.

Other: E N
Other: E N
Other: E N
Other: E N
Other: E N
Water Quality Management Plan (WQMP)

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2.4 Water Quality Credits
A water quality credit program is applicable for certain types of development projects if it is not feasible to meet the requirements for on-site LID. Proponents for eligible projects, as described below, can apply for water quality credits that would reduce project obligations for selecting and sizing other treatment BMP or participating in other alternative compliance programs. Refer to Section 6.2 in the TGD for WQMP to determine if water quality credits are applicable for the project.

Form 2.4-1 Water Quality Credits
1 Project Types that Qualify for Water Quality Credits: Select all that apply Redevelopment projects that
reduce the overall impervious
footprint of the project site.
[Credit = % impervious reduced]
Higher density
development projects
Vertical density [20%]
7 units/ acre [5%]
Mixed use development,
(combination of residential,
commercial, industrial, office,
institutional, or other land uses
which incorporate design principles
that demonstrate environmental
benefits not realized through single
use projects) [20%]
Brownfield
redevelopment
(redevelop real property
complicated by presence
or potential of hazardous
contaminants) [25%]
Redevelopment projects in
established historic district,
historic preservation area, or
similar significant core city center
areas [10%]
Transit-oriented
developments (mixed use
residential or commercial
area designed to maximize
access to public
transportation) [20%]
In-fill projects (conversion of
empty lots & other underused
spaces < 5 acres, substantially
surrounded by urban land uses, into
more beneficially used spaces, such
as residential or commercial areas)
[10%]
Live-Work
developments (variety of
developments designed
to support residential and
vocational needs) [20%]
2 Total Credit % 0 (Total all credit percentages up to a maximum allowable credit of 50 percent) Description of Water Quality
Credit Eligibility (if applicable)

N/A
Water Quality Management Plan (WQMP)

3-1
Section 3 Site and Watershed Description
Describe the project site conditions that will facilitate the selection of BMP through an analysis of the physical conditions and limitations of the site and its receiving waters. Identify distinct drainage areas (DA) that collect flow from a portion of the site and describe how runoff from each DA (and sub-watershed DMAs) is conveyed to the site outlet(s). Refer to Section 3.2 in the TGD for WQMP. The form below is provided as an example.

Then complete Forms 3.2 and 3.3 for each DA on the project site. If the project has more than one drainage area for stormwater management, then complete additional versions of these forms for each DA / outlet.

Form 3-1 Site Location and Hydrologic Features
Site coordinates take GPS
measurement at approximate
center of site
Latitude 34.1145 Longitude -117.4105 Thomas Bros Map page Page 5, Grid F-4
1 San Bernardino County climatic region: Valley Mountain 2 Does the site have more than one drainage area (DA): Yes No If no, proceed to Form 3-2. If yes, then use this form to show a conceptual schematic describing DMAs and hydrologic feature connecting DMAs to the site outlet(s). An example is provided below that can be modified for proposed project or a drawing clearly showing DMA and flow routing may be attached

Example only – modify for project specific WQMP using additional form Conveyance Briefly describe on-site drainage features to convey runoff that is not retained within a DMA DA1 to Outlet 1 DA1 will drain to basin
DA2 to Outlet 2 DA2 will drain to basin
DA3 to Outlet 3 DA3 will drain to basin

Outlet 1
DA1
Outlet 2
DA2
Outlet 3
DA3
Water Quality Management Plan (WQMP)

3-2
Form 3-2 Existing Hydrologic Characteristics for Drainage Area 1 For Drainage Area 1’s sub-watershed DMA,
provide the following characteristics DMA A DMA B DMA C DMA D 1 DMA drainage area (ft2) 123,737
2 Existing site impervious area (ft2) 0
3 Antecedent moisture condition For desert
areas, use
http://www.sbcounty.gov/dpw/floodcontrol/pdf/2
0100412_map.pdf

2 4 Hydrologic soil group Refer to Watershed
Mapping Tool –
http://permitrack.sbcounty.gov/wap/
A
5 Longest flowpath length (ft) 504
6 Longest flowpath slope (ft/ft) 0.23
7 Current land cover type(s) Select from Fig C-3
of Hydrology Manual
Commerical
8 Pre-developed pervious area condition:

Based on the extent of wet season vegetated cover
good >75%; Fair 50-75%; Poor <50% Attach photos
of site to support rating
Poor

Water Quality Management Plan (WQMP)

3-3
Form 3-2 Existing Hydrologic Characteristics for Drainage Area 1 (use only as needed for additional DMA w/in DA 1)
For Drainage Area 1’s sub-watershed DMA,
provide the following characteristics DMA E DMA F DMA G DMA H 1 DMA drainage area (ft2)
2 Existing site impervious area (ft2)
3 Antecedent moisture condition For desert
areas, use
http://www.sbcounty.gov/dpw/floodcontrol/pdf/2
0100412_map.pdf

4 Hydrologic soil group Refer to Watershed
Mapping Tool –
http://permitrack.sbcounty.gov/wap/

5 Longest flowpath length (ft)
6 Longest flowpath slope (ft/ft)
7 Current land cover type(s) Select from Fig C-3
of Hydrology Manual

8 Pre-developed pervious area condition:

Based on the extent of wet season vegetated cover
good >75%; Fair 50-75%; Poor <50% Attach photos
of site to support rating

Water Quality Management Plan (WQMP)

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Form 3-3 Watershed Description for Drainage Area
Receiving waters
Refer to Watershed Mapping Tool -
http://permitrack.sbcounty.gov/wap/
See ‘Drainage Facilities” link at this website
Cactus Channel
Santa Ana River, Reach 4
Santa Ana River, Reach 3
Santa Ana River, Reach 2
Santa Ana River, Reach 1
Pacific Ocean
Applicable TMDLs
Refer to Local Implementation Plan
Indicator Bacteria
303(d) listed impairments
Refer to Local Implementation Plan and Watershed
Mapping Tool –
http://permitrack.sbcounty.gov/wap/ and State
Water Resources Control Board website –
http://www.waterboards.ca.gov/santaana/water_iss
ues/programs/tmdl/index.shtml
Santa Ana River, Reach 4 – Pathogens
Santa Ana River, Reach 3 – Copper, Lead, Pathogens
Santa Ana River, Reach 2 – Indicator Bacteria
Environmentally Sensitive Areas (ESA)
Refer to Watershed Mapping Tool –
http://permitrack.sbcounty.gov/wap/
None
Unlined Downstream Water Bodies
Refer to Watershed Mapping Tool –
http://permitrack.sbcounty.gov/wap/
None
Hydrologic Conditions of Concern
Yes Complete Hydrologic Conditions of Concern (HCOC) Assessment. Include Forms

4.2-2 through Form 4.2-5 and Hydromodification BMP Form 4.3-10 in submittal No
Watershed–based BMP included in a RWQCB
approved WAP
Yes Attach verification of regional BMP evaluation criteria in WAP • More Effective than On-site LID
• Remaining Capacity for Project DCV
• Upstream of any Water of the US
• Operational at Project Completion
• Long-Term Maintenance Plan
No
Water Quality Management Plan (WQMP)

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Section 4 Best Management Practices (BMP)

4.1 Source Control BMP

4.1.1 Pollution Prevention
Non-structural and structural source control BMP are required to be incorporated into all new development and significant redevelopment projects. Form 4.1-1 and 4.1-2 are used to describe specific source control BMPs used in the WQMP or to explain why a certain BMP is not applicable. Table 7-3 of the TGD for WQMP provides a list of applicable source control BMP for projects with specific types of potential pollutant sources or activities.

The source control BMP in this table must be implemented for projects with these specific types of potential pollutant sources or activities.

The preparers of this WQMP have reviewed the source control BMP requirements for new development and significant redevelopment projects. The preparers have also reviewed the specific BMP required for project as specified in Forms 4.1-1 and 4.1-2. All applicable non-structural and structural source control BMP shall be implemented in the project.

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Form 4.1-1 Non-Structural Source Control BMPs
Identifier Name
Check One Describe BMP Implementation OR,
if not applicable, state reason Included Not
Applicable
N1 Education of Property Owners, Tenants
and Occupants on Stormwater BMPs
Owners and employees shall read and learn all attached educational material pertinent to the used BMPs. It shall be the owner's responsibility to ensure that all employees are educated on the BMPs within the first month of employment. Educational materials included, but not limited to, those listed in Appendix C shall be made readily available to employees.

N2 Activity Restrictions
Owner shall force employees to maintain good housekeeping and enforce restrictions to employees, customers and guests. Such restrictions should include no washing of vehicles, and no vehicle repair outside the proposed covered repair bays. Owner and employees shall not discharge any chemicals, wastewater or other prohibited discharges

listed in the City and County Ordinances onto the DA and therefore the downstream receiving waters. Pesticide application shall be done by a licensed applicator.

N3 Landscape Management BMPs
Landscape maintenance activities for this site include mowing, trimming, weeding and irrigation. For irrigation, the owner shall install automatic timers and a water efficient system to minimize runoff. Owner shall be responsible for educating and training employees on appropriate landscape maintenance or hire a qualified professional.

Maintenance shall be done weekly or as needed.

N4 BMP Maintenance
Non-structural BMP maintenance shall include the items listed on this table. Structural BMPs maintenance shall follow the Operations and Maintenance Plan included in Appendix B.

N5 Title 22 CCR Compliance
(How development will comply)

Owner is responsible for educating employees regarding compliance with Title 22 CCR on hazardous waste management procedures. Education and training, including, but not limited to, the use, repair, and replacement of equipment.

N6 Local Water Quality Ordinances
The proposed development includes a BMP to treat stormwater runoff before discharging onto the public storm drain system. The owner shall also ensure that all other business activities comply with other San Bernardino County ordinances.

N7 Spill Contingency Plan The owner shall implement a spill contingency plan for all hazardous materials stored and used on site regarding automotive repair and tire installation.

Water Quality Management Plan (WQMP)

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Form 4.1-1 Non-Structural Source Control BMPs
N8 Underground Storage Tank Compliance There are no underground storage tanks at this site.

N9 Hazardous Materials Disclosure
Compliance
Owner shall be responsible to disclose all hazardous materials stored and used on site to the appropriate agency or agencies to facilitate emergency incidents.

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4-4
Form 4.1-1 Non-Structural Source Control BMPs
Identifier Name
Check One
Describe BMP Implementation OR,
if not applicable, state reason Included Not
Applicable
N10 Uniform Fire Code Implementation Owner shall ensure to comply with the most recent Uniform Fire Code by providing a hazardous waste storage.

N11 Litter/Debris Control Program
It is the owner’s responsibility to implement or delegate good in-door and out-door housekeeping practices. Duties include, but are not limited to, sweeping, emptying out trash cans, and dealing with spills. These duties shall be done weekly and as necessary.

All trash enclosures shall be covered at all times to prevent further runoff contamination. Trash dumpsters shall be emptied by an appropriate company at least once a week to prevent trash stockpiling.

N12 Employee Training
The owner shall use the attached educational materials and operations and maintenance plan to educate employees and guests on landscape and bmp maintenance, housekeeping and outdoor maintenance.

N13 Housekeeping of Loading Docks There are no loading docks at this site.

N14 Catch Basin Inspection Program There are no catch basins in the proposed development.

N15 Vacuum Sweeping of Private Streets and
Parking Lots

It is the owner’s responsibility to vacuum sweep or have someone vacuum sweep the parking lot twice a month and as necessary to prevent sediment, trash, and other pollutants out of the proposed stormwater management plan. In addition, parking lots must be swept in late summer or early fall, prior to the start of the rainy season.

N16 Other Non-structural Measures for Public
Agency Projects
There are no additional non-structural measures.

N17 Comply with all other applicable NPDES
permits
Owner will comply with all other applicable NPDES permits including General Construction Permit during construction.

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4-5
Form 4.1-2 Structural Source Control BMPs
Identifier Name
Check One Describe BMP Implementation OR,
If not applicable, state reason Included Not
Applicable
S1 Provide storm drain system stencilling and signage
(CASQA New Development BMP Handbook SD-13)
Proposed development does not require new storm drain inlets.

S2
Design and construct outdoor material storage
areas to reduce pollution introduction (CASQA
New Development BMP Handbook SD-34)
All outdoor tire and material storage shall be covered to prevent material runoff.

S3
Design and construct trash and waste storage
areas to reduce pollution introduction (CASQA
New Development BMP Handbook SD-32)

Pollution introductions from trash dumpsters will be prevented with covered trash receptacles. All trash dumpsters will be located on concrete pads to prevent infiltration. Trash enclosures must have a permanent cover.

S4
Use efficient irrigation systems & landscape
design, water conservation, smart controllers, and
source control (State-wide Model Landscape
Ordinance; CASQA New Development BMP
Handbook SD-12)

Owner shall install a water efficient irrigation system compliant with County water conservation resolutions. Irrigation system shall include rain-triggered shutoff devices. Owner shall implement the use of drought tolerant plants and use native species to minimize water usage.

S5
Finish grade of landscaped areas at a minimum of
1-2 inches below top of curb, sidewalk, or
pavement
All landscape shall be constructed, at a minimum, 1"-2" below proposed pavement, curbs, etc.

S6
Protect slopes and channels and provide energy
dissipation (CASQA New Development BMP
Handbook SD-10)
No existing slopes or channels.

S7 Covered dock areas (CASQA New Development
BMP Handbook SD-31)
There are no loading docks at this site.

S8
Covered maintenance bays with spill containment
plans (CASQA New Development BMP Handbook
SD-31)
No covered maintenance bays.

S9 Vehicle wash areas with spill containment plans
(CASQA New Development BMP Handbook SD-33)
Car washing will not be available at this site.

S10 Covered outdoor processing areas (CASQA New
Development BMP Handbook SD-36)
Site will not include outdoor processing areas. All materials and activities for vehicle maintenance shall be done inside the maintenance bays.

Water Quality Management Plan (WQMP)

4-6
Form 4.1-2 Structural Source Control BMPs
Identifier Name
Check One Describe BMP Implementation OR,
If not applicable, state reason Included Not
Applicable
S11
Equipment wash areas with spill containment
plans (CASQA New Development BMP Handbook
SD-33)
Project does not include wash areas.

S12 Fueling areas (CASQA New Development BMP
Handbook SD-30)
There are no fueling proposed.

S13 Hillside landscaping (CASQA New Development
BMP Handbook SD-10)
This is not a hillside development.

S14 Wash water control for food preparation areas The proposed development does not include preparation of food.

S15 Community car wash racks (CASQA New
Development BMP Handbook SD-33)
There will be no on-site car wash.

Water Quality Management Plan (WQMP)

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4.1.2 Preventative LID Site Design Practices
Site design practices associated with new LID requirements in the MS4 Permit should be considered in the earliest phases of a project. Preventative site design practices can result in smaller DCV for LID BMP and hydromodification control BMP by reducing runoff generation. Describe site design and drainage plan including:

Refer to Section 5.2 of the TGD for WQMP for more details.

Form 4.1-3 Preventative LID Site Design Practices Checklist Site Design Practices
If yes, explain how preventative site design practice is addressed in project site plan. If no, other LID BMPs must be selected to meet targets Minimize impervious areas: Yes No
Explanation: The proposed sidewalk/ walkways areas will per city std.

Maximize natural infiltration capacity: Yes No
Explanation: The proposed development includes a Infiltration basin to utilize the site's natural infiltration capacity.

Preserve existing drainage patterns and time of concentration: Yes No Explanation: The proposed development mimics the existing drainage pattern as all runoff sheet flows in a southeasterly direction towards the proposed bmp. Time of concentration has also been increased by providing longer flow paths.

Disconnect impervious areas: Yes No
Explanation: Disconnecting impervious areas is not feasible for the proposed development. Project includes a Infiltration basin as an alternative for increasing Time of concentration.

Protect existing vegetation and sensitive areas: Yes No Explanation: There is little to no existing vegetation. There are no existing sensitive areas. Project includes new landscaped areas and a Infiltration basin as an alternative to increase Time of concentration.

Re-vegetate disturbed areas: Yes No
Explanation: The project proposed landscaping in the front, rear, and sides of the property.

Minimize unnecessary compaction in stormwater retention/infiltration basin/trench areas: Yes No Explanation: The stormwater Infiltration basin has been placed towards the rear of the property where little to no construction will take place in its vicinity.

Utilize vegetated drainage swales in place of underground piping or imperviously lined swales: Yes No Explanation: Landscape swales are proposed along the sides of the property to minimize the impervious footprint.

Stake off areas that will be used for landscaping to minimize compaction during construction : Yes No Explanation: Landscape areas will be marked off during construction to prevent unnecessary compaction of those areas.

 A narrative of site design practices utilized or rationale for not using practices  A narrative of how site plan incorporates preventive site design practices  Include an attached Site Plan layout which shows how preventative site design practices are included in WQMP
Water Quality Management Plan (WQMP)

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4.2 Project Performance Criteria
The purpose of this section of the Project WQMP is to establish targets for post-development hydrology based on performance criteria specified in the MS4 Permit. These targets include runoff volume for water quality control (referred to as LID design capture volume), and runoff volume, time of concentration, and peak runoff for protection of any downstream waterbody segments with a HCOC. If the project has more than one outlet for stormwater runoff, then complete additional versions of these forms for each DA / outlet.

Methods applied in the following forms include:
 For LID BMP Design Capture Volume (DCV), the San Bernardino County Stormwater Program requires use of the P6 method (MS4 Permit Section XI.D.6a.ii) – Form 4.2-1  For HCOC pre- and post-development hydrologic calculation, the San Bernardino County Stormwater Program requires the use of the Rational Method (San Bernardino County Hydrology Manual Section D). Forms 4.2-2 through Form 4.2-5 calculate hydrologic variables including runoff volume, time of concentration, and peak runoff from the project site pre- and post-development using the Hydrology Manual Rational Method approach.

For projects greater than 640 acres (1.0 mi 2), the Rational Method and these forms should not be used. For such projects, the Unit Hydrograph Method (San Bernardino County Hydrology Manual Section E) shall be applied for hydrologic calculations for HCOC performance criteria.

Refer to Section 4 in the TGD for WQMP for detailed guidance and instructions.

Form 4.2-1 LID BMP Performance Criteria for Design Capture Volume (DA 1)
1 Project area DA 1 (ft2):
37,374
2 Imperviousness after applying preventative
site design practices (Imp%): 0.71
3 Runoff Coefficient (Rc): _0.50
Rc = 0.858(Imp%)^3-0.78(Imp%)^2+0.774(Imp%)+0.04
4 Determine 1-hour rainfall depth for a 2-year return period P2yr-1hr (in): 0.712 http://hdsc.nws.noaa.gov/hdsc/pfds/sa/sca_pfds.html 5 Compute P6, Mean 6-hr Precipitation (inches): 1.05
P6 = Item 4 *C1, where C1 is a function of site climatic region specified in Form 3-1 Item 1 (Valley = 1.4807; Mountain = 1.909; Desert = 1.2371) 6 Drawdown Rate
Use 48 hours as the default condition. Selection and use of the 24 hour drawdown time condition is subject to approval by the local jurisdiction. The necessary BMP footprint is a function of drawdown time. While shorter drawdown times reduce the performance criteria for LID BMP design capture volume, the depth of water that can be stored is also reduced.
24-hrs
48-hrs
7 Compute design capture volume, DCV (ft3): 3,209.73
DCV = 1/12 * [Item 1* Item 3 *Item 5 * C2], where C2 is a function of drawdown rate (24-hr = 1.582; 48-hr = 1.963) Compute separate DCV for each outlet from the project site per schematic drawn in Form 3-1 Item 2

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Form 4.2-1 LID BMP Performance Criteria for Design Capture Volume (DA 2)
1 Project area DA 1 (ft2):
5,404
2 Imperviousness after applying preventative
site design practices (Imp%): 0.75
3 Runoff Coefficient (Rc): _0.54
Rc = 0.858(Imp%)^3-0.78(Imp%)^2+0.774(Imp%)+0.04
4 Determine 1-hour rainfall depth for a 2-year return period P2yr-1hr (in): 0.712 http://hdsc.nws.noaa.gov/hdsc/pfds/sa/sca_pfds.html 5 Compute P6, Mean 6-hr Precipitation (inches): 1.05
P6 = Item 4 *C1, where C1 is a function of site climatic region specified in Form 3-1 Item 1 (Valley = 1.4807; Mountain = 1.909; Desert = 1.2371) 6 Drawdown Rate
Use 48 hours as the default condition. Selection and use of the 24 hour drawdown time condition is subject to approval by the local jurisdiction. The necessary BMP footprint is a function of drawdown time. While shorter drawdown times reduce the performance criteria for LID BMP design capture volume, the depth of water that can be stored is also reduced.
24-hrs
48-hrs
7 Compute design capture volume, DCV (ft3): 501.23
DCV = 1/12 * [Item 1* Item 3 *Item 5 * C2], where C2 is a function of drawdown rate (24-hr = 1.582; 48-hr = 1.963) Compute separate DCV for each outlet from the project site per schematic drawn in Form 3-1 Item 2

Form 4.2-1 LID BMP Performance Criteria for Design Capture Volume (DA 3)
1 Project area DA 1 (ft2):
80,959
2 Imperviousness after applying preventative
site design practices (Imp%): 0.91
3 Runoff Coefficient (Rc): _0.74
Rc = 0.858(Imp%)^3-0.78(Imp%)^2+0.774(Imp%)+0.04
4 Determine 1-hour rainfall depth for a 2-year return period P2yr-1hr (in): 0.712 http://hdsc.nws.noaa.gov/hdsc/pfds/sa/sca_pfds.html 5 Compute P6, Mean 6-hr Precipitation (inches): 1.05
P6 = Item 4 *C1, where C1 is a function of site climatic region specified in Form 3-1 Item 1 (Valley = 1.4807; Mountain = 1.909; Desert = 1.2371) 6 Drawdown Rate
Use 48 hours as the default condition. Selection and use of the 24 hour drawdown time condition is subject to approval by the local jurisdiction. The necessary BMP footprint is a function of drawdown time. While shorter drawdown times reduce the performance criteria for LID BMP design capture volume, the depth of water that can be stored is also reduced.
24-hrs
48-hrs
7 Compute design capture volume, DCV (ft3): 10,290.23
DCV = 1/12 * [Item 1* Item 3 *Item 5 * C2], where C2 is a function of drawdown rate (24-hr = 1.582; 48-hr = 1.963) Compute separate DCV for each outlet from the project site per schematic drawn in Form 3-1 Item 2

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Form 4.2-2 Summary of HCOC Assessment (DA 1)
Does project have the potential to cause or contribute to an HCOC in a downstream channel: Yes No Go to: http://permitrack.sbcounty.gov/wap/
If “Yes”, then complete HCOC assessment of site hydrology for 2yr storm event using Forms 4.2-3 through 4.2-5 and insert results below (Forms 4.2-3 through 4.2-5 may be replaced by computer software analysis based on the San Bernardino County Hydrology Manual) If “No,” then proceed to Section 4.3 Project Conformance Analysis Condition Runoff Volume (ft3) Time of Concentration (min) Peak Runoff (cfs) Pre-developed
1 Form 4.2-3 Item 12
2 Form 4.2-4 Item 13
3 Form 4.2-5 Item 10
Post-developed
4 Form 4.2-3 Item 13
5 Form 4.2-4 Item 14
6 Form 4.2-5 Item 14
Difference
7 Item 4 – Item 1
8 Item 2 – Item 5
9 Item 6 – Item 3
Difference
(as % of pre-developed)
10 %
Item 7 / Item 1
11 %
Item 8 / Item 2
12 %
Item 9 / Item 3
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Form 4.2-3 HCOC Assessment for Runoff Volume (DA 1)
Weighted Curve Number
Determination for:

Pre-developed DA

DMA A DMA B DMA C DMA D DMA E DMA F DMA G DMA H
1a Land Cover type
2a Hydrologic Soil Group (HSG)
3a DMA Area, ft2 sum of areas of
DMA should equal area of DA

4a Curve Number (CN) use Items
1 and 2 to select the appropriate CN
from Appendix C-2 of the TGD for
WQMP

Weighted Curve Number
Determination for:

Post-developed DA

DMA A DMA B DMA C DMA D DMA E DMA F DMA G DMA H
1b Land Cover type
2b Hydrologic Soil Group (HSG)
3b DMA Area, ft2 sum of areas of
DMA should equal area of DA

4b Curve Number (CN) use Items
5 and 6 to select the appropriate CN
from Appendix C-2 of the TGD for
WQMP

5 Pre-Developed area-weighted CN: 7 Pre-developed soil storage capacity, S (in):

S = (1000 / Item 5) - 10
9 Initial abstraction, Ia (in):

Ia = 0.2 * Item 7
6 Post-Developed area-weighted CN: 8 Post-developed soil storage capacity, S (in):

S = (1000 / Item 6) - 10
10 Initial abstraction, Ia (in):

Ia = 0.2 * Item 8
11 Precipitation for 2 yr, 24 hr storm (in):

Go to: http://hdsc.nws.noaa.gov/hdsc/pfds/sa/sca_pfds.html 12 Pre-developed Volume (ft3):

Vpre =(1 / 12) * (Item sum of Item 3) * [(Item 11 – Item 9)^2 / ((Item 11 – Item 9 + Item 7) 13 Post-developed Volume (ft3):

Vpre =(1 / 12) * (Item sum of Item 3) * [(Item 11 – Item 10)^2 / ((Item 11 – Item 10 + Item 8) 14 Volume Reduction needed to meet HCOC Requirement, (ft3):

VHCOC = (Item 13 * 0.95) – Item 12

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Form 4.2-4 HCOC Assessment for Time of Concentration (DA 1) Compute time of concentration for pre and post developed conditions for each DA (For projects using the Hydrology Manual complete the form below)
Variables
Pre-developed DA1
Use additional forms if there are more than 4 DMA
Post-developed DA1
Use additional forms if there are more than 4 DMA

DMA A DMA B DMA C DMA D DMA A DMA B DMA C DMA D
1 Length of flowpath (ft) Use Form 3-2
Item 5 for pre-developed condition

2 Change in elevation (ft)
3 Slope (ft/ft), So = Item 2 / Item 1

4 Land cover
5 Initial DMA Time of Concentration
(min) Appendix C-1 of the TGD for WQMP

6 Length of conveyance from DMA
outlet to project site outlet (ft)
May be zero if DMA outlet is at project
site outlet

7 Cross-sectional area of channel (ft2)
8 Wetted perimeter of channel (ft)
9 Manning’s roughness of channel (n)
10 Channel flow velocity (ft/sec)
Vfps = (1.49 / Item 9) * (Item 7/Item 8)^0.67
* (Item 3)^0.5

11 Travel time to outlet (min)
Tt = Item 6 / (Item 10 * 60)

12 Total time of concentration (min)
Tc = Item 5 + Item 11

13 Pre-developed time of concentration (min): Minimum of Item 12 pre-developed DMA 14 Post-developed time of concentration (min): Minimum of Item 12 post-developed DMA

15 Additional time of concentration needed to meet HCOC requirement (min): TC-HCOC = (Item 13 * 0.95) – Item 14 Water Quality Management Plan (WQMP)

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Form 4.2-5 HCOC Assessment for Peak Runoff (DA 1)
Compute peak runoff for pre- and post-developed conditions Variables
Pre-developed DA to Project
Outlet (Use additional forms if
more than 3 DMA)
Post-developed DA to Project
Outlet (Use additional forms if
more than 3 DMA)

DMA A DMA B DMA C DMA A DMA B DMA C
1 Rainfall Intensity for storm duration equal to time of concentration Ipeak = 10^(LOG Form 4.2-1 Item 4 - 0.6 LOG Form 4.2-4 Item 5 /60)

2 Drainage Area of each DMA (Acres)
For DMA with outlet at project site outlet, include upstream DMA (Using example schematic in Form 3-1, DMA A will include drainage from DMA C)

3 Ratio of pervious area to total area
For DMA with outlet at project site outlet, include upstream DMA (Using example schematic in Form 3-1, DMA A will include drainage from DMA C)

4 Pervious area infiltration rate (in/hr)
Use pervious area CN and antecedent moisture condition with Appendix C-3 of the TGD for WQMP

5 Maximum loss rate (in/hr)
Fm = Item 3 * Item 4
Use area-weighted Fm from DMA with outlet at project site outlet, include upstream DMA (Using example schematic in Form 3-1, DMA A will include drainage from DMA C)

6 Peak Flow from DMA (cfs)
Qp =Item 2 * 0.9 * (Item 1 - Item 5)

7 Time of concentration adjustment factor for other DMA to site discharge point
Form 4.2-4 Item 12 DMA / Other DMA upstream of site discharge point (If ratio is greater than 1.0, then use maximum value of 1.0) DMA A n/a n/a
DMA B n/a n/a
DMA C n/a n/a
8 Pre-developed Qp at Tc for DMA A:

Qp = Item 6DMAA + [Item 6DMAB * (Item 1DMAA - Item
5DMAB)/(Item 1DMAB - Item 5DMAB)* Item 7DMAA/2] +
[Item 6DMAC * (Item 1DMAA - Item 5DMAC)/(Item 1DMAC -
Item 5DMAC)* Item 7DMAA/3]
9 Pre-developed Qp at Tc for DMA B:

Qp = Item 6DMAB + [Item 6DMAA * (Item 1DMAB - Item
5DMAA)/(Item 1DMAA - Item 5DMAA)* Item 7DMAB/1] +
[Item 6DMAC * (Item 1DMAB - Item 5DMAC)/(Item 1DMAC -
Item 5DMAC)* Item 7DMAB/3]
10 Pre-developed Qp at Tc for DMA C:

Qp = Item 6DMAC + [Item 6DMAA * (Item 1DMAC - Item
5DMAA)/(Item 1DMAA - Item 5DMAA)* Item 7DMAC/1] +
[Item 6DMAB * (Item 1DMAC - Item 5DMAB)/(Item 1DMAB
- Item 5DMAB)* Item 7DMAC/2]
10 Peak runoff from pre-developed condition confluence analysis (cfs): Maximum of Item 8, 9, and 10 (including additional forms as needed) 11 Post-developed Qp at Tc for DMA A:

Same as Item 8 for post-developed values
12 Post-developed Qp at Tc for DMA B:

Same as Item 9 for post-developed values
13 Post-developed Qp at Tc for DMA C:

Same as Item 10 for post-developed
values
14 Peak runoff from post-developed condition confluence analysis (cfs): Maximum of Item 11, 12, and 13 (including additional forms as needed)
15 Peak runoff reduction needed to meet HCOC Requirement (cfs): Qp-HCOC = (Item 14 * 0.95) – Item 10 Water Quality Management Plan (WQMP)

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4.3 Project Conformance Analysis
Complete the following forms for each project site DA to document that the proposed LID BMPs conform to the project DCV developed to meet performance criteria specified in the MS4 Permit (WQMP Template Section

4.2). For the LID DCV, the forms are ordered according to hierarchy of BMP selection as required by the MS4 Permit (see Section 5.3.1 in the TGD for WQMP). The forms compute the following for on-site LID BMP:
 Site Design and Hydrologic Source Controls (Form 4.3-2)  Retention and Infiltration (Form 4.3-3)
 Harvested and Use (Form 4.3-4) or
 Biotreatment (Form 4.3-5).

At the end of each form, additional fields facilitate the determination of the extent of mitigation provided by the specific BMP category, allowing for use of the next category of BMP in the hierarchy, if necessary.

The first step in the analysis, using Section 5.3.2.1 of the TGD for WQMP, is to complete Forms 4.3-1 and 4.3-3) to determine if retention and infiltration BMPs are infeasible for the project. For each feasibility criterion in Form 4.3-1, if the answer is “Yes,” provide all study findings that includes relevant calculations, maps, data sources, etc. used to make the determination of infeasibility.

Next, complete Forms 4.3-2 and 4.3-4 to determine the feasibility of applicable HSC and harvest and use BMPs, and, if their implementation is feasible, the extent of mitigation of the DCV.

If no site constraints exist that would limit the type of BMP to be implemented in a DA, evaluate the use of combinations of LID BMPs, including all applicable HSC BMPs to maximize on-site retention of the DCV. If no combination of BMP can mitigate the entire DCV, implement the single BMP type, or combination of BMP types, that maximizes on-site retention of the DCV within the minimum effective area.

If the combination of LID HSC, retention and infiltration, and harvest and use BMPs are unable to mitigate the entire DCV, then biotreatment BMPs may be implemented by the project proponent. If biotreatment BMPs are used, then they must be sized to provide sufficient capacity for effective treatment of the remainder of the volume-based performance criteria that cannot be achieved with LID BMPs (TGD for WQMP Section 5.4.4.2).

Under no circumstances shall any portion of the DCV be released from the site without effective mitigation and/or treatment.

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Form 4.3-1 Infiltration BMP Feasibility (DA 1)
Feasibility Criterion – Complete evaluation for each DA on the Project Site 1 Would infiltration BMP pose significant risk for groundwater related concerns? Yes No Refer to Section 5.3.2.1 of the TGD for WQMP
If Yes, Provide basis: (attach)
2 Would installation of infiltration BMP significantly increase the risk of geotechnical hazards? Yes No (Yes, if the answer to any of the following questions is yes, as established by a geotechnical expert):
 The location is less than 50 feet away from slopes steeper than 15 percent  The location is less than eight feet from building foundations or an alternative setback.  A study certified by a geotechnical professional or an available watershed study determines that stormwater infiltration would result in significantly increased risks of geotechnical hazards.

If Yes, Provide basis: (attach)
3 Would infiltration of runoff on a Project site violate downstream water rights? Yes No If Yes, Provide basis: (attach)
4 Is proposed infiltration facility located on hydrologic soil group (HSG) D soils or does the site geotechnical investigation indicate presence of soil characteristics, which support categorization as D soils? Yes No If Yes, Provide basis: (attach)
5 Is the design infiltration rate, after accounting for safety factor of 2.0, below proposed facility less than 0.3 in/hr (accounting for soil amendments)? Yes No If Yes, Provide basis: (attach)
6 Would on-site infiltration or reduction of runoff over pre-developed conditions be partially or fully inconsistent with watershed management strategies as defined in the WAP, or impair beneficial uses? Yes No See Section 3.5 of the TGD for WQMP and WAP
If Yes, Provide basis: (attach)
7 Any answer from Item 1 through Item 3 is “Yes”: Yes No If yes, infiltration of any volume is not feasible onsite. Proceed to Form 4.3-4, Harvest and Use BMP. If no, then proceed to Item 8 below.
8 Any answer from Item 4 through Item 6 is “Yes”: Yes No If yes, infiltration is permissible but is not required to be considered. Proceed to Form 4.3-2, Hydrologic Source Control BMP.

If no, then proceed to Item 9, below.
9 All answers to Item 1 through Item 6 are “No”: Yes No Infiltration of the full DCV is potentially feasible, LID infiltration BMP must be designed to infiltrate the full DCV to the MEP.

Proceed to Form 4.3-2, Hydrologic Source Control BMP.

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4.3.1 Site Design Hydrologic Source Control BMP
Section XI.E. of the Permit emphasizes the use of LID preventative measures; and the use of LID HSC BMPs reduces the portion of the DCV that must be addressed in downstream BMPs. Therefore, all applicable HSC shall be provided except where they are mutually exclusive with each other, or with other BMPs. Mutual exclusivity may result from overlapping BMP footprints such that either would be potentially feasible by itself, but both could not be implemented. Please note that while there are no numeric standards regarding the use of HSC, if a project cannot feasibly meet BMP sizing requirements or cannot fully address HCOCs, feasibility of all applicable HSC must be part of demonstrating that the BMP system has been designed to retain the maximum feasible portion of the DCV. Complete Form 4.3-2 to identify and calculate estimated retention volume from implementing site design HSC BMP. Refer to Section 5.4.1 in the TGD for more detailed guidance.

Form 4.3-2 Site Design Hydrologic Source Control BMPs (DA 1) 1 Implementation of Impervious Area Dispersion BMP (i.e. routing runoff from impervious to pervious areas), excluding impervious areas planned for routing to on-lot infiltration BMP: Yes No If yes, complete Items 2-5; If no,
proceed to Item 6

DA DMA
BMP Type

DA DMA
BMP Type
(Use additional forms
for more BMPs)
2 Total impervious area draining to pervious area (ft2) 3 Ratio of pervious area receiving runoff to impervious area 4 Retention volume achieved from impervious area
dispersion (ft3) V = Item2 * Item 3 * (0.5/12), assuming retention of 0.5 inches of runoff

5 Sum of retention volume achieved from impervious area dispersion (ft 3): 0 Vretention =Sum of Item 4 for all BMPs 6 Implementation of Localized On-lot Infiltration BMPs (e.g. on-lot rain gardens): Yes No If yes, complete Items 7- 13 for aggregate of all on-lot infiltration BMP in each DA; If no, proceed to Item 14

DA DMA
BMP Type

DA DMA
BMP Type
(Use additional forms
for more BMPs)
7 Ponding surface area (ft2)
8 Ponding depth (ft)
9 Surface area of amended soil/gravel (ft2)
10 Average depth of amended soil/gravel (ft)
11 Average porosity of amended soil/gravel
12 Retention volume achieved from on-lot infiltration (ft3) Vretention = (Item 7 *Item 8) + (Item 9 * Item 10 * Item 11)

13 Runoff volume retention from on-lot infiltration (ft3): 0 Vretention =Sum of Item 12 for all BMPs Water Quality Management Plan (WQMP)

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Form 4.3-2 cont. Site Design Hydrologic Source Control BMPs (DA 1) 14 Implementation of evapotranspiration BMP (green,
brown, or blue roofs): Yes No
If yes, complete Items 15-20. If no, proceed to Item 21

DA DMA
BMP Type

DA DMA
BMP Type
(Use additional forms
for more BMPs)
15 Rooftop area planned for ET BMP (ft2)
16 Average wet season ET demand (in/day)
Use local values, typical ~ 0.1

17 Daily ET demand (ft3/day)
Item 15 * (Item 16 / 12)

18 Drawdown time (hrs)
Copy Item 6 in Form 4.2-1

19 Retention Volume (ft3)
Vretention = Item 17 * (Item 18 / 24)

20 Runoff volume retention from evapotranspiration BMPs (ft3): 0 Vretention =Sum of Item 19 for all BMPs 21 Implementation of Street Trees: Yes No
If yes, complete Items 22-25. If no, proceed to Item 26

DA DMA
BMP Type

DA DMA
BMP Type
(Use additional forms
for more BMPs)
22 Number of Street Trees
23 Average canopy cover over impervious area (ft2)
24 Runoff volume retention from street trees (ft3)
Vretention = Item 22 * Item 23 * (0.05/12) assume runoff retention of

0.05 inches

25 Runoff volume retention from street tree BMPs (ft3): 0 Vretention = Sum of Item 24 for all BMPs

26 Implementation of residential rain barrel/cisterns: Yes No If yes, complete Items 27-29; If no, proceed to Item 30

DA DMA
BMP Type

DA DMA
BMP Type
(Use additional forms
for more BMPs)
27 Number of rain barrels/cisterns
28 Runoff volume retention from rain barrels/cisterns (ft3) Vretention = Item 27 * 3

29 Runoff volume retention from residential rain barrels/Cisterns (ft3): 0 Vretention =Sum of Item 28 for all BMPs

30 Total Retention Volume from Site Design Hydrologic Source Control BMPs: 0 Sum of Items 5, 13, 20, 25 and 29 Water Quality Management Plan (WQMP)

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4.3.2 Infiltration BMPs
Use Form 4.3-3 to compute on-site retention of runoff from proposed retention and infiltration BMPs. Volume retention estimates are sensitive to the percolation rate used, which determines the amount of runoff that can be infiltrated within the specified drawdown time. The infiltration safety factor reduces field measured percolation to account for potential inaccuracy associated with field measurements, declining BMP performance over time, and compaction during construction. Appendix D of the TGD for WQMP provides guidance on estimating an appropriate safety factor to use in Form 4.3-3.

If site constraints limit the use of BMPs to a single type and implementation of retention and infiltration BMPs mitigate no more than 40% of the DCV, then they are considered infeasible and the Project Proponent may evaluate the effectiveness of BMPs lower in the LID hierarchy of use (Section 5.5.1 of the TGD for WQMP) If implementation of infiltrations BMPs is feasible as determined using Form 4.3-1, then LID infiltration BMPs shall be implemented to the MEP (section 4.1 of the TGD for WQMP).

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Form 4.3-3 Infiltration LID BMP - including underground BMPs (DA 1) 1 Remaining LID DCV not met by site design HSC BMP (ft3): 3,209.73 Vunmet = Form 4.2-1 Item 7 - Form 4.3-2 Item 30 BMP Type Use columns to the right to compute runoff volume retention from proposed infiltration BMP (select BMP from Table 5-4 in TGD for WQMP) - Use additional forms for more BMPs
DA 1 DMA 1
BMP Type
Infiltration basin

DA DMA
BMP Type

DA DMA
BMP Type
(Use additional forms
for more BMPs)
2 Infiltration rate of underlying soils (in/hr) See Section 5.4.2 and Appendix D of the TGD for WQMP for minimum requirements for assessment methods

4.66 3 Infiltration safety factor See TGD Section 5.4.2 and Appendix D 2.81 4 Design percolation rate (in/hr) Pdesign = Item 2 / Item 3 1.66 5 Ponded water drawdown time (hr) Copy Item 6 in Form 4.2-1 48 6 Maximum ponding depth (ft) BMP specific, see Table 5-4 of the TGD for WQMP for BMP design details
1 7 Ponding Depth (ft) dBMP = Minimum of (1/12*Item 4*Item 5) or Item 6 1 8 Infiltrating surface area, SABMP (ft2) the lesser of the area needed for infiltration of full DCV or minimum space requirements from Table 5.7 of the TGD for WQMP
560
9 Amended soil depth, dmedia (ft) Only included in certain BMP types, see Table 5-4 in the TGD for WQMP for reference to BMP design details 0 10 Amended soil porosity 0
11 Gravel depth, dmedia (ft) Only included in certain BMP types, see Table 5-4 of the TGD for WQMP for BMP design details
0 12 Gravel porosity 0
13 Duration of storm as basin is filling (hrs) Typical ~ 3hrs 3 14 Above Ground Retention Volume (ft3) Vretention = Item 8 * [Item7 + (Item 9 * Item 10) + (Item 11 * Item 12) + (Item 13 * (Item 4 / 12))] 792.40
15 Underground Retention Volume (ft3) Volume determined using manufacturer’s specifications and calculations
2,605.28 See next
page

16 Total Retention Volume from LID Infiltration BMPs: 3,397.68 (Sum of Items 14 and 15 for all infiltration BMP included in plan) 17 Fraction of DCV achieved with infiltration BMP: 106% Retention% = Item 16 / Form 4.2-1 Item 7 18 Is full LID DCV retained onsite with combination of hydrologic source control and LID retention/infiltration BMPs? Yes No If yes, demonstrate conformance using Form 4.3-10; If no, then reduce Item 3, Factor of Safety to 2.0 and increase Item 8, Infiltrating Surface Area, such that the portion of the site area used for retention and infiltration BMPs equals or exceeds the minimum effective area thresholds (Table 5-7 of the TGD for WQMP) for the applicable category of development and repeat all above calculations. \\Nas-new\data\projects\CI Rialto\JN3308 GldnLand\WQMP\BMP CALC.dwg, 2/24/2022 12:02:20 PM, 1:30 Water Quality Management Plan (WQMP)

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Form 4.3-3 Infiltration LID BMP - including underground BMPs (DA 2) 1 Remaining LID DCV not met by site design HSC BMP (ft3): 501.23 Vunmet = Form 4.2-1 Item 7 - Form 4.3-2 Item 30 BMP Type Use columns to the right to compute runoff volume retention from proposed infiltration BMP (select BMP from Table 5-4 in TGD for WQMP) - Use additional forms for more BMPs
DA 1 DMA 1
BMP Type
Infiltration basin

DA DMA
BMP Type

4.66 3 Infiltration safety factor See TGD Section 5.4.2 and Appendix D 2.81 4 Design percolation rate (in/hr) Pdesign = Item 2 / Item 3 1.66 5 Ponded water drawdown time (hr) Copy Item 6 in Form 4.2-1 48 6 Maximum ponding depth (ft) BMP specific, see Table 5-4 of the TGD for WQMP for BMP design details
1 7 Ponding Depth (ft) dBMP = Minimum of (1/12*Item 4*Item 5) or Item 6 1 8 Infiltrating surface area, SABMP (ft2) the lesser of the area needed for infiltration of full DCV or minimum space requirements from Table 5.7 of the TGD for WQMP
81 9 Amended soil depth, dmedia (ft) Only included in certain BMP types, see Table 5-4 in the TGD for WQMP for reference to BMP design details 0 10 Amended soil porosity 0
11 Gravel depth, dmedia (ft) Only included in certain BMP types, see Table 5-4 of the TGD for WQMP for BMP design details
0 12 Gravel porosity 0
13 Duration of storm as basin is filling (hrs) Typical ~ 3hrs 3 14 Above Ground Retention Volume (ft3) Vretention = Item 8 * [Item7 + (Item 9 * Item 10) + (Item 11 * Item 12) + (Item 13 * (Item 4 / 12))] 114.62
15 Underground Retention Volume (ft3) Volume determined using manufacturer’s specifications and calculations
465.53 See next
page

16 Total Retention Volume from LID Infiltration BMPs: 580.15 (Sum of Items 14 and 15 for all infiltration BMP included in plan) 17 Fraction of DCV achieved with infiltration BMP: 116% Retention% = Item 16 / Form 4.2-1 Item 7 18 Is full LID DCV retained onsite with combination of hydrologic source control and LID retention/infiltration BMPs? Yes No If yes, demonstrate conformance using Form 4.3-10; If no, then reduce Item 3, Factor of Safety to 2.0 and increase Item 8, Infiltrating Surface Area, such that the portion of the site area used for retention and infiltration BMPs equals or exceeds the minimum effective area thresholds (Table 5-7 of the TGD for WQMP) for the applicable category of development and repeat all above calculations. \\Nas-new\data\projects\CI Rialto\JN3308 GldnLand\WQMP\BMP CALC.dwg, 2/24/2022 12:02:34 PM, 1:30 Water Quality Management Plan (WQMP)

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Form 4.3-3 Infiltration LID BMP - including underground BMPs (DA 3) 1 Remaining LID DCV not met by site design HSC BMP (ft3): 10,290.23 Vunmet = Form 4.2-1 Item 7 - Form 4.3-2 Item 30 BMP Type Use columns to the right to compute runoff volume retention from proposed infiltration BMP (select BMP from Table 5-4 in TGD for WQMP) - Use additional forms for more BMPs
DA 1 DMA 1
BMP Type
Infiltration basin

DA DMA
BMP Type

4.66 3 Infiltration safety factor See TGD Section 5.4.2 and Appendix D 2.81 4 Design percolation rate (in/hr) Pdesign = Item 2 / Item 3 1.66 5 Ponded water drawdown time (hr) Copy Item 6 in Form 4.2-1 48 6 Maximum ponding depth (ft) BMP specific, see Table 5-4 of the TGD for WQMP for BMP design details
1 7 Ponding Depth (ft) dBMP = Minimum of (1/12*Item 4*Item 5) or Item 6 1 8 Infiltrating surface area, SABMP (ft2) the lesser of the area needed for infiltration of full DCV or minimum space requirements from Table 5.7 of the TGD for WQMP
925
9 Amended soil depth, dmedia (ft) Only included in certain BMP types, see Table 5-4 in the TGD for WQMP for reference to BMP design details 0 10 Amended soil porosity 0
11 Gravel depth, dmedia (ft) Only included in certain BMP types, see Table 5-4 of the TGD for WQMP for BMP design details
0 12 Gravel porosity 0
13 Duration of storm as basin is filling (hrs) Typical ~ 3hrs 3 14 Above Ground Retention Volume (ft3) Vretention = Item 8 * [Item7 + (Item 9 * Item 10) + (Item 11 * Item 12) + (Item 13 * (Item 4 / 12))] 1,308.88
15 Underground Retention Volume (ft3) Volume determined using manufacturer’s specifications and calculations
9,172.06 See next
page

16 Total Retention Volume from LID Infiltration BMPs: 10,480.94 (Sum of Items 14 and 15 for all infiltration BMP included in plan) 17 Fraction of DCV achieved with infiltration BMP: 102% Retention% = Item 16 / Form 4.2-1 Item 7 18 Is full LID DCV retained onsite with combination of hydrologic source control and LID retention/infiltration BMPs? Yes No If yes, demonstrate conformance using Form 4.3-10; If no, then reduce Item 3, Factor of Safety to 2.0 and increase Item 8, Infiltrating Surface Area, such that the portion of the site area used for retention and infiltration BMPs equals or exceeds the minimum effective area thresholds (Table 5-7 of the TGD for WQMP) for the applicable category of development and repeat all above calculations. \\Nas-new\data\projects\CI Rialto\JN3308 GldnLand\WQMP\BMP CALC.dwg, 2/24/2022 12:02:47 PM, 1:30 Water Quality Management Plan (WQMP)

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4.3.3 Harvest and Use BMP
Harvest and use BMP may be considered if the full LID DCV cannot be met by maximizing infiltration BMPs.

Use Form 4.3-4 to compute on-site retention of runoff from proposed harvest and use BMPs.

Volume retention estimates for harvest and use BMPs are sensitive to the on-site demand for captured stormwater. Since irrigation water demand is low in the wet season, when most rainfall events occur in San Bernardino County, the volume of water that can be used within a specified drawdown period is relatively low.

The bottom portion of Form 4.3-4 facilitates the necessary computations to show infeasibility if a minimum incremental benefit of 40 percent of the LID DCV would not be achievable with MEP implementation of on-site harvest and use of stormwater (Section 5.5.4 of the TGD for WQMP).

Form 4.3-4 Harvest and Use BMPs (DA 1)
1 Remaining LID DCV not met by site design HSC or infiltration BMP (ft 3): 0 Vunmet = Form 4.2-1 Item 7 - Form 4.3-2 Item 30 – Form 4.3-3 Item 16 BMP Type(s) Compute runoff volume retention from proposed harvest and use BMP (Select BMPs from Table 5-4 of the TGD for WQMP) - Use additional forms for more BMPs

DA DMA
BMP Type

DA DMA
BMP Type
(Use additional forms
for more BMPs)
2 Describe cistern or runoff detention facility
3 Storage volume for proposed detention type (ft3) Volume of cistern

4 Landscaped area planned for use of harvested stormwater (ft2)

5 Average wet season daily irrigation demand (in/day)
Use local values, typical ~ 0.1 in/day

6 Daily water demand (ft3/day) Item 4 * (Item 5 / 12)
7 Drawdown time (hrs) Copy Item 6 from Form 4.2-1
8Retention Volume (ft3)
Vretention = Minimum of (Item 3) or (Item 6 * (Item 7 / 24))

9 Total Retention Volume (ft3) from Harvest and Use BMP Sum of Item 8 for all harvest and use BMP included in plan 10 Is the full DCV retained with a combination of LID HSC, retention and infiltration, and harvest & use BMPs? Yes No If yes, demonstrate conformance using Form 4.3-10. If no, then re-evaluate combinations of all LID BMP and optimize their implementation such that the maximum portion of the DCV is retained on-site (using a single BMP type or combination of BMP types). If the full DCV cannot be mitigated after this optimization process, proceed to Section 4.3.4.

Water Quality Management Plan (WQMP)

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4.3.4 Biotreatment BMP
Biotreatment BMPs may be considered if the full LID DCV cannot be met by maximizing retention and infiltration, and harvest and use BMPs. A key consideration when using biotreatment BMP is the effectiveness of the proposed BMP in addressing the pollutants of concern for the project (see Table 5-5 of the TGD for WQMP).

Use Form 4.3-5 to summarize the potential for volume based and/or flow based biotreatment options to biotreat the remaining unmet LID DCV w. Biotreatment computations are included as follows:
 Use Form 4.3-6 to compute biotreatment in small volume based biotreatment BMP (e.g. bioretention w/underdrains);  Use Form 4.3-7 to compute biotreatment in large volume based biotreatment BMP (e.g. constructed wetlands);  Use Form 4.3-8 to compute sizing criteria for flow-based biotreatment BMP (e.g. bioswales)

Form 4.3-5 Selection and Evaluation of Biotreatment BMP (DA 1) 1 Remaining LID DCV not met by site design HSC,
infiltration, or harvest and use BMP for potential
biotreatment (ft3): 0 Form 4.2-1 Item 7 - Form 4.3-2 Item 30 – Form 4.3-3 Item 16- Form 4.3-4 Item 9
List pollutants of concern Copy from Form 2.3-1.

2 Biotreatment BMP Selected
(Select biotreatment BMP(s)
necessary to ensure all pollutants of
concern are addressed through Unit
Operations and Processes, described
in Table 5-5 of the TGD for WQMP)
Volume-based biotreatment
Use Forms 4.3-6 and 4.3-7 to compute treated volume
Flow-based biotreatment
Use Form 4.3-8 to compute treated volume
Bioretention with underdrain
Planter box with underdrain
Constructed wetlands
Wet extended detention
Dry extended detention
Vegetated swale
Vegetated filter strip
Proprietary biotreatment
3 Volume biotreated in volume based
biotreatment BMP (ft3): Form 4.3-
6 Item 15 + Form 4.3-7 Item 13
4 Compute remaining LID DCV with
implementation of volume based biotreatment
BMP (ft3): Item 1 – Item 3
5 Remaining fraction of LID DCV for
sizing flow based biotreatment BMP:
% Item 4 / Item 1
6 Flow-based biotreatment BMP capacity provided (cfs): Use Figure 5-2 of the TGD for WQMP to determine flow capacity required to provide biotreatment of remaining percentage of unmet LID DCV (Item 5), for the project’s precipitation zone (Form 3-1 Item 1) 7 Metrics for MEP determination:
 Provided a WQMP with the portion of site area used for suite of LID BMP equal to minimum thresholds in Table 5-7 of the TGD for WQMP for the proposed category of development: If maximized on-site retention BMPs is feasible for partial capture, then LID BMP implementation must be optimized to retain and infiltrate the maximum portion of the DCV possible within the prescribed minimum effective area. The remaining portion of the DCV shall then be mitigated using biotreatment BMP.

Water Quality Management Plan (WQMP)

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Form 4.3-6 Volume Based Biotreatment (DA 1) –
Bioretention and Planter Boxes with Underdrains
Biotreatment BMP Type
(Bioretention w/underdrain, planter box w/underdrain, other comparable BMP)

DA DMA
BMP Type

DA DMA
BMP Type
(Use additional forms
for more BMPs)
1 Pollutants addressed with BMP List all pollutant of concern that will be effectively reduced through specific Unit Operations and Processes described in Table 5-5 of the TGD for WQMP

2 Amended soil infiltration rate Typical ~ 5.0

3 Amended soil infiltration safety factor Typical ~ 2.0 4 Amended soil design percolation rate (in/hr) Pdesign = Item 2 / Item 3

5 Ponded water drawdown time (hr) Copy Item 6 from Form 4.2-1 6 Maximum ponding depth (ft) see Table 5-6 of the TGD for WQMP for reference to BMP design details

7 Ponding Depth (ft) dBMP = Minimum of (1/12 * Item 4 * Item 5) or Item 6

8 Amended soil surface area (ft2)
9 Amended soil depth (ft) see Table 5-6 of the TGD for WQMP for reference to BMP design details

10 Amended soil porosity, n
11 Gravel depth (ft) see Table 5-6 of the TGD for WQMP for reference to BMP design details

12 Gravel porosity, n
13 Duration of storm as basin is filling (hrs) Typical ~ 3hrs 14 Biotreated Volume (ft3) Vbiotreated = Item 8 * [(Item 7/2) + (Item 9 * Item 10) +(Item 11 * Item 12) + (Item 13 * (Item 4 / 12))]

15 Total biotreated volume from bioretention and/or planter box with underdrains BMP:

Sum of Item 14 for all volume-based BMPs included in this form Water Quality Management Plan (WQMP)

4-25

Form 4.3-7 Volume Based Biotreatment (DA 1) –
Constructed Wetlands and Extended Detention
Biotreatment BMP Type
Constructed wetlands, extended wet detention, extended dry detention, or other comparable proprietary BMP. If BMP includes multiple modules (e.g. forebay and main basin), provide separate estimates for storage and pollutants treated in each module.

DA DMA
BMP Type

DA DMA
BMP Type
(Use additional forms
for more BMPs)
Forebay Basin Forebay Basin
1 Pollutants addressed with BMP forebay and basin
List all pollutant of concern that will be effectively reduced through specific Unit Operations and Processes described in Table 5-5 of the TGD for WQMP

2 Bottom width (ft)
3 Bottom length (ft)
4 Bottom area (ft2) Abottom = Item 2 * Item 3
5 Side slope (ft/ft)
6 Depth of storage (ft)
7 Water surface area (ft2)
Asurface =(Item 2 + (2 * Item 5 * Item 6)) * (Item 3 + (2 * Item 5 * Item 6))

8 Storage volume (ft3) For BMP with a forebay, ensure fraction of total storage is within ranges specified in BMP specific fact sheets, see Table 5-6 of the TGD for WQMP for reference to BMP design details V =Item 6 / 3 * [Item 4 + Item 7 + (Item 4 * Item 7)^0.5]

9 Drawdown Time (hrs) Copy Item 6 from Form 2.1
10 Outflow rate (cfs) QBMP = (Item 8forebay + Item 8basin) / (Item 9 * 3600) 11 Duration of design storm event (hrs)
12 Biotreated Volume (ft3)
Vbiotreated = (Item 8forebay + Item 8basin) +( Item 10 * Item 11 * 3600)

13 Total biotreated volume from constructed wetlands, extended dry detention, or extended wet detention :
(Sum of Item 12 for all BMP included in plan)
Water Quality Management Plan (WQMP)

4-26
Form 4.3-8 Flow Based Biotreatment (DA 1)
Biotreatment BMP Type
Vegetated swale, vegetated filter strip, or other comparable proprietary BMP

DA DMA
BMP Type

DA DMA
BMP Type
(Use additional forms
for more BMPs)
1 Pollutants addressed with BMP
List all pollutant of concern that will be effectively reduced through specific Unit Operations and Processes described in TGD Table 5-5

2 Flow depth for water quality treatment (ft)
BMP specific, see Table 5-6 of the TGD for WQMP for reference to BMP design details

3 Bed slope (ft/ft)
BMP specific, see Table 5-6 of the TGD for WQMP for reference to BMP design details

4 Manning's roughness coefficient
5 Bottom width (ft)
bw = (Form 4.3-5 Item 6 * Item 4) / (1.49 * Item 2^1.67 * Item 3^0.5)

6 Side Slope (ft/ft)
BMP specific, see Table 5-6 of the TGD for WQMP for reference to BMP design details

7 Cross sectional area (ft2)
A = (Item 5 * Item 2) + (Item 6 * Item 2^2)

8 Water quality flow velocity (ft/sec)
V = Form 4.3-5 Item 6 / Item 7

9 Hydraulic residence time (min)
Pollutant specific, see Table 5-6 of the TGD for WQMP for reference to BMP design details

10 Length of flow based BMP (ft)
L = Item 8 * Item 9 * 60

11 Water surface area at water quality flow depth (ft2) SAtop = (Item 5 + (2 * Item 2 * Item 6)) * Item 10

Water Quality Management Plan (WQMP)

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4.3.5 Conformance Summary
Complete Form 4.3-9 to demonstrate how on-site LID DCV is met with proposed site design hydrologic source control, infiltration, harvest and use, and/or biotreatment BMP. The bottom line of the form is used to describe the basis for infeasibility determination for on-site LID BMP to achieve full LID DCV, and provides methods for computing remaining volume to be addressed in an alternative compliance plan. If the project has more than one outlet, then complete additional versions of this form for each outlet.

Form 4.3-9 Conformance Summary and Alternative
Compliance Volume Estimate (DA 1)
1 Total LID DCV for the Project DA-1 (ft3): 3,209.73 Copy Item 7 in Form 4.2-1 2 On-site retention with site design hydrologic source control LID BMP (ft 3): 0 Copy Item 30 in Form 4.3-2 3 On-site retention with LID infiltration BMP (ft3): 3,397.68 Copy Item 16 in Form 4.3-3 4 On-site retention with LID harvest and use BMP (ft3): 0 Copy Item 9 in Form 4.3-4 5 On-site biotreatment with volume based biotreatment BMP (ft3): 0 Copy Item 3 in Form 4.3-5 6 Flow capacity provided by flow based biotreatment BMP (cfs): 0 Copy Item 6 in Form 4.3-5 7 LID BMP performance criteria are achieved if answer to any of the following is “Yes”:
 Full retention of LID DCV with site design HSC, infiltration, or harvest and use BMP: Yes No If yes, sum of Items 2, 3, and 4 is greater than Item 1  Combination of on-site retention BMPs for a portion of the LID DCV and volume-based biotreatment BMP that address all pollutants of concern for the remaining LID DCV: Yes No If yes, a) sum of Items 2, 3, 4, and 5 is greater than Item 1, and Items 2, 3 and 4 are maximized; or b) Item 6 is greater than Form

4.3--5 Item 6 and Items 2, 3 and 4 are maximized
 On-site retention and infiltration is determined to be infeasible and biotreatment BMP provide biotreatment for all pollutants of concern for full LID DCV: Yes No
If yes, Form 4.3-1 Items 7 and 8 were both checked yes
8 If the LID DCV is not achieved by any of these means, then the project may be allowed to develop an alternative compliance plan. Check box that describes the scenario which caused the need for alternative compliance:
 Combination of HSC, retention and infiltration, harvest and use, and biotreatment BMPs provide less than full LID DCV capture:

Checked yes for Form 4.3-5 Item 7, Item 6 is zero, and sum of Items 2, 3, 4, and 5 is less than Item 1. If so, apply water quality credits and calculate volume for alternative compliance, Valt = (Item 1 – Item 2 – Item 3 – Item 4 – Item 5) * (100 - Form 2.4-1 Item 2)%  An approved Watershed Action Plan (WAP) demonstrates that water quality and hydrologic impacts of urbanization are more effective when managed in at an off-site facility:

Attach appropriate WAP section, including technical documentation, showing effectiveness comparisons for the project site and regional watershed
Water Quality Management Plan (WQMP)

4-28

Form 4.3-9 Conformance Summary and Alternative
Compliance Volume Estimate (DA 2)
1 Total LID DCV for the Project DA-1 (ft3): 501.23 Copy Item 7 in Form 4.2-1 2 On-site retention with site design hydrologic source control LID BMP (ft 3): 0 Copy Item 30 in Form 4.3-2 3 On-site retention with LID infiltration BMP (ft3): 580.15 Copy Item 16 in Form 4.3-3 4 On-site retention with LID harvest and use BMP (ft3): 0 Copy Item 9 in Form 4.3-4 5 On-site biotreatment with volume based biotreatment BMP (ft3): 0 Copy Item 3 in Form 4.3-5 6 Flow capacity provided by flow based biotreatment BMP (cfs): 0 Copy Item 6 in Form 4.3-5 7 LID BMP performance criteria are achieved if answer to any of the following is “Yes”:
 Full retention of LID DCV with site design HSC, infiltration, or harvest and use BMP: Yes No If yes, sum of Items 2, 3, and 4 is greater than Item 1  Combination of on-site retention BMPs for a portion of the LID DCV and volume-based biotreatment BMP that address all pollutants of concern for the remaining LID DCV: Yes No If yes, a) sum of Items 2, 3, 4, and 5 is greater than Item 1, and Items 2, 3 and 4 are maximized; or b) Item 6 is greater than Form

Attach appropriate WAP section, including technical documentation, showing effectiveness comparisons for the project site and regional watershed
Water Quality Management Plan (WQMP)

4-29
Form 4.3-9 Conformance Summary and Alternative
Compliance Volume Estimate (DA 3)
1 Total LID DCV for the Project DA-1 (ft3): 10,290.23 Copy Item 7 in Form 4.2-1 2 On-site retention with site design hydrologic source control LID BMP (ft 3): 0 Copy Item 30 in Form 4.3-2 3 On-site retention with LID infiltration BMP (ft3): 10,480.94 Copy Item 16 in Form 4.3-3 4 On-site retention with LID harvest and use BMP (ft3): 0 Copy Item 9 in Form 4.3-4 5 On-site biotreatment with volume based biotreatment BMP (ft3): 0 Copy Item 3 in Form 4.3-5 6 Flow capacity provided by flow based biotreatment BMP (cfs): 0 Copy Item 6 in Form 4.3-5 7 LID BMP performance criteria are achieved if answer to any of the following is “Yes”:
 Full retention of LID DCV with site design HSC, infiltration, or harvest and use BMP: Yes No If yes, sum of Items 2, 3, and 4 is greater than Item 1  Combination of on-site retention BMPs for a portion of the LID DCV and volume-based biotreatment BMP that address all pollutants of concern for the remaining LID DCV: Yes No If yes, a) sum of Items 2, 3, 4, and 5 is greater than Item 1, and Items 2, 3 and 4 are maximized; or b) Item 6 is greater than Form

Attach appropriate WAP section, including technical documentation, showing effectiveness comparisons for the project site and regional watershed
Water Quality Management Plan (WQMP)

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4.3.6 Hydromodification Control BMP
Use Form 4.3-10 to compute the remaining runoff volume retention, after LID BMP are implemented, needed to address HCOC, and the increase in time of concentration and decrease in peak runoff necessary to meet targets for protection of waterbodies with a potential HCOC. Describe hydromodification control BMP that address HCOC, which may include off-site BMP and/or in-stream controls. Section 5.6 of the TGD for WQMP provides additional details on selection and evaluation of hydromodification control BMP.

Form 4.3-10 Hydromodification Control BMPs (DA 1)
1 Volume reduction needed for HCOC
performance criteria (ft3): 0
(Form 4.2-2 Item 4 * 0.95) – Form 4.2-2 Item 1

2 On-site retention with site design hydrologic source control, infiltration, and harvest and use LID BMP (ft3): Sum of Form 4.3-9 Items 2, 3, and 4 Evaluate option to increase implementation of on-site retention in Forms 4.3-2, 4.3-3, and 4.3-4 in excess of LID DCV toward achieving HCOC volume reduction

3 Remaining volume for HCOC
volume capture (ft3): Item 1 –
Item 2
4 Volume capture provided by incorporating additional on-site or off-site retention BMPs (ft3): Existing downstream BMP may be used to demonstrate additional volume capture (if so, attach to this WQMP a hydrologic analysis showing how the additional volume would be retained during a 2-yr storm event for the regional watershed)
5 If Item 4 is less than Item 3, incorporate in-stream controls on downstream waterbody segment to prevent impacts due to hydromodification Attach in-stream control BMP selection and evaluation to this WQMP

6 Is Form 4.2-2 Item 11 less than or equal to 5%: Yes No If yes, HCOC performance criteria is achieved. If no, select one or more mitigation options below:
 Demonstrate increase in time of concentration achieved by proposed LID site design, LID BMP, and additional on-site or off-site retention BMP
BMP upstream of a waterbody segment with a potential HCOC may be used to demonstrate increased time of concentration through hydrograph attenuation (if so, show that the hydraulic residence time provided in BMP for a 2-year storm event is equal or greater than the addition time of concentration requirement in Form 4.2-4 Item 15)  Increase time of concentration by preserving pre-developed flow path and/or increase travel time by reducing slope and increasing cross-sectional area and roughness for proposed on-site conveyance facilities  Incorporate appropriate in-stream controls for downstream waterbody segment to prevent impacts due to hydromodification, in a plan approved and signed by a licensed engineer in the State of California 7 Form 4.2-2 Item 12 less than or equal to 5%: Yes No If yes, HCOC performance criteria is achieved. If no, select one or more mitigation options below:
 Demonstrate reduction in peak runoff achieved by proposed LID site design, LID BMPs, and additional on-site or off- site retention BMPs

BMPs upstream of a waterbody segment with a potential HCOC may be used to demonstrate additional peak runoff reduction through hydrograph attenuation (if so, attach to this WQMP, a hydrograph analysis showing how the peak runoff would be reduced during a 2-yr storm event)
 Incorporate appropriate in-stream controls for downstream waterbody segment to prevent impacts due to hydromodification, in a plan approved and signed by a licensed engineer in the State of California Water Quality Management Plan (WQMP)

4-31

4.4 Alternative Compliance Plan (if applicable)
Describe an alternative compliance plan (if applicable) for projects not fully able to infiltrate, harvest and use, or biotreat the DCV via on-site LID practices. A project proponent must develop an alternative compliance plan to address the remainder of the LID DCV. Depending on project type some projects may qualify for water quality credits that can be applied to reduce the DCV that must be treated prior to development of an alternative compliance plan (see Form 2.4-1, Water Quality Credits). Form 4.3-9 Item 8 includes instructions on how to apply water quality credits when computing the DCV that must be met through alternative compliance.

Alternative compliance plans may include one or more of the following elements:
 On-site structural treatment control BMP - All treatment control BMP should be located as close to possible to the pollutant sources and should not be located within receiving waters;  Off-site structural treatment control BMP - Pollutant removal should occur prior to discharge of runoff to receiving waters;
 Urban runoff fund or In-lieu program, if available
Depending upon the proposed alternative compliance plan, approval by the executive officer may or may not be required (see Section 6 of the TGD for WQMP).

Water Quality Management Plan (WQMP)

5-1
Section 5 Inspection and Maintenance Responsibility
for Post Construction BMP

All BMP included as part of the project WQMP are required to be maintained through regular scheduled inspection and maintenance (refer to Section 8, Post Construction BMP Requirements, in the TGD for WQMP).

Fully complete Form 5-1 summarizing all BMP included in the WQMP. Attach additional forms as needed. The WQMP shall also include a detailed Operation and Maintenance Plan for all BMP and may require a Maintenance Agreement (consult the jurisdiction’s LIP). If a Maintenance Agreement is required, it must also be attached to the WQMP.

Form 5-1 BMP Inspection and Maintenance
(use additional forms as necessary)
BMP Reponsible
Party(s)
Inspection/ Maintenance
Activities Required
Minimum Frequency
of Activities
N1 & N12 -
Education of
Owners/Tenants/
Occupants of BMPs.

Employee
Training
Owner
Owner and employees shall read all the educational
materials and the operation and maintenance plan
attached in this WQMP. O&M plan is provided in
Appendix B and the Educational Materials in Appendix C.

Within the first month
of employment.

Review shall be done
annually
N2 – Activity
Restrictions Owner
Owner shall enforce all applicable restrictions to avoid additional pollutant introduction into the stormwater
BMPs. Such restrictions should include, but are not limited to, car washing and vehicle maintenance outside the
covered repair bays. Pesticide application must be done with a licensed applicator
On-going
N3 & S4 –
Landscape
Maintenance &
Irrigation System
Owner
Mowing, trimming and weeding of landscape areas should
be done periodically. Inspections of the irrigation system should also be done to look for leaks, and prevent excess watering.

Weekly and as
needed
N4 & S6 –
Infiltration
Basin Maintenance
Owner
Owner shall trim, mow, and weed existing vegetation in
the Infiltration basin, check for erosion issues, and
revegetate slopes when needed. Removal of debris and
inspections for hydraulic capacity are vital to the
operation of infiltration basins.

Weekly and as
needed
N11 & N15 – Litter
Control Program &
Parking Lot
Sweeping
Owner
Owner shall maintain good housekeeping practices to
prevent trash buildup and sediment erosion. Trash shall be picked and disposed of correctly in corresponding trash receptacles.

Biweekly and as
needed.

S3 – Trash and
Waste
Storage
Owner
Owner shall ensure that all trash receptacles are covered to prevent rain from entering the bins. Owner shall check for leaks in the trash receptacles and prevent further
stormwater contamination.

Once a month
Water Quality Management Plan (WQMP)

5-2
S5 – Finished Grade
of
Landscape Areas
Owner
Owner shall verify that all landscape areas have a finished grade 1”-2” below adjacent impervious surface. This will prevent sediment from overflowing and contaminating
the stormwater BMP.

During construction
S8 & S11 – Covered
Maintenance Bays
and
Spill Containment
Plans
Owner
Owner shall ensure that all employees make all
appropriate vehicle maintenance inside the covered
maintenance bays. It is the owner’s responsibility to
ensure that all employees correctly clean up and dispose of waste produced during vehicle maintenance
operations.

On-going

6-1

Section 6 WQMP Attachments

6.1. Site Plan and Drainage Plan
Include a site plan and drainage plan sheet set containing the following minimum information:

6.2 Electronic Data Submittal
Minimum requirements include submittal of PDF exhibits in addition to hard copies. Format must not require specialized software to open. If the local jurisdiction requires specialized electronic document formats (as described in their local Local Implementation Plan), this section will describe the contents (e.g., layering, nomenclature, geo-referencing, etc.) of these documents so that they may be interpreted efficiently and accurately.

6.3 Post Construction
Attach all O&M Plans and Maintenance Agreements for BMP to the WQMP.

6.4 Other Supporting Documentation
 BMP Educational Materials
 Activity Restriction – C, C&R’s & Lease Agreements


Project location
 Site boundary
 Land uses and land covers, as applicable
 Suitability/feasibility constraints
 Structural Source Control BMP locations
 Site Design Hydrologic Source Control BMP locations
 LID BMP details
 Drainage delineations and flow information
 Drainage connections

6-2

6.1. Site Plan and Drainage Plan

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CITY OF RIALTO
1 SITE PLAN
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6-3

6.2 Electronic Data Submittal

Will be submitted at Final WQMP.

6-4

6.3 Post Construction
O&M Plans and Maintenance Agreements
Will be submitted at Final WQMP.

6-5

6.4 Other Supporting Documentation
 BMP Educational Materials
 BMP Facts Sheets
 Infiltration Test
 Pre & Post development hydrology maps

6-6

1. Educational Materials Included

The following is a list of educational materials included in this WQMP.

 A safe garden
 Landscape maintenance
 Trash Enclosures

6-7

2. BMP Facts Sheets Included

The following is a list of BMP facts sheets included in this WQMP.

 SD-11 Roof runoff controls
 SD-12 Landscape area
 SD-32 Trash enclosures
 TC-11 Infiltration basin

6-8

3. Infiltration Test

SWC of Locust Avenue and Stonehurst Drive Project No. 18110-01 City of Rialto, California September 25, 2018

GeoMat Testing Laboratories, Inc. Page 7

4.0 SOIL INFILTRATION

Four test holes were provided with 4-inch-diameter perforated PVC casing wrapped with filter fabric. The boreholes were p resoaked prior to the percolation testing. Presoaking was conducted usin g five gallon water bottles. All of soaking water seeped away while the technician was onsite.

After presoaking, infiltration boreholes were tested for and met the Sand Soil Criteria. Infiltration testing continued for and additional hour. Time measure ment was taken every ten minutes. The measurements were taken by filling up the test hole with water and allowing the water to percolate. The drop of water level was recorded every measurement. A stop watch was used to record the time measurements.

4.1 Infiltration Test Results

Based on the results of this study, infiltration of stormwater in the upper site soils is expected to be fast. The following summarizes the result of the infiltration feasibility study.

Test No. Test Depth Below
Ground Surface
Percolation Raw Rate
(in/hr)
Adjusted Infiltration Rate
(in/hr)
P-1 54” 57.00 12.32
P-2 54” 60.00 12.63
P-3 54” 31.50 5.54
P-4 54” 75.00 13.04

The percolation rate is the rate in horizontal and vertical direction. This rate is adjusted using Perchet Method for horizontal water infiltration. Refer to Appendix E for test results.

A safety factor should be applied to this rate by the design engineer. Safety factor discussion is in the following paragraph.

4.2 Factors of Safety

Long-term infiltration rates may be reduced significantly by factors such as soil variability and inaccuracy in the infiltration rate measurement. Safety factors for operating the system, maintenance, siltation, biofouling, etc. should also be considered by the design civil engineer at his discretion. Minimum safety factor required by the County of San Bernardino for tests conducted when deep exploratory borehole has been drilled at the site is 2. Maximum safety factor is 9. Actual safety factor should be based on Worksheet “H” in the Technical Guidance Document Appendices for County of San Bernardino.

4.3 Considerations for Infiltration Facilities

• In our opinion, water infiltration at the site is expected to be fast in the upper five feet of soil.

• Filter fabric should be used whenever aggregates are placed against native soils.

• Infiltration water should not be allowed to saturate pavement and concrete structures subgrade soils.

• The planned infiltration system should extend vertically into native soil.

• Please note that soils in infiltration areas should not be subject to compaction during construction.

• The proposed system by the civil engineer should be constructed and maintained in accordance with manufacturer guidelines.

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4. Pre & Post Development Hydrology Report

2.80 AC
L=530'

DRAINAGE BOUNDARY

1.9 ACDRAINAGE AREA IN ACRES

DRAINAGE SUB-BOUNDARY

LONGEST PATH OF TRAVEL
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DRAINAGE BOUNDARY

1.9 ACDRAINAGE AREA IN ACRES
DRAINAGE SUB-BOUNDARY 1.9 AC
L=640'

LONGEST PATH OF TRAVEL

0.9 AC
L=530'
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Rialto City CouncilFebruary 28, 2023

Rialto City Council
February 28, 2023