Attachment B - Engineering Report — City Council and Concurrent Authorities, October 17, 2023

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
i

TABLE OF CONTENTS
1 Water System Information ................................................................................................................... 1 2 Project Description ............................................................................................................................... 2 3 Alternative Solutions ............................................................................................................................ 3 4 Consolidation Feasibility....................................................................................................................... 3 5 Water Demands.................................................................................................................................... 4 6 Proposed Schedule .............................................................................................................................10 7 References ..........................................................................................................................................10

LIST OF TABLES
Table 1 - Century MHP Water Use Data ....................................................................................................... 5 Table 2 – Sunny Rd Property Water Use Data .............................................................................................. 5 Table 3 - Century MHP and Sunny Rd Control Scenarios.............................................................................. 6 Table 4 - Project Cost Estimate ..................................................................................................................... 8 Table 5 - City and Regulatory Agency Responses ......................................................................................... 9

LIST OF FIGURES
Figure 1 - Water Pressure Under PHD as Evaluated by West Yost and Associates [1] ................................. 7

ATTACHMENTS
Attachment A – Map of Existing Facilities
Attachment B – Documents Justifying Ranked Problem
Attachment C – Map of System’s Proposed Facilities
Attachment D – Detailed Cost Estimate
Attachment E – Proposed Project Schedule
Attachment F – Supplemental Information Form
Attachment G – Permit Application and Instruction Materials from Regulatory Agencies

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
1 1 Water System Information
The Sunny Rd Water system (previously called Silvia Avalos property) is in San Joaquin County, 850 ft east of the intersection of Sunny Road and Kingsley Road (also referred to as the State Route-99, SR-99, frontage road). The property is within 0.2 miles of City limits. The physical addresses of the Sunny Rd properties range from 3530 to 3596 East Sunny Road. The existing well serving the system is located at 3542 Sunny Rd. The overall area of the property is 2.0 ac and can be seen in Attachment C. The Assessor’s Parcel Number for the property is 181-13-33 in Section 28, Township 1, North Range 7 East, of the Mount Diablo Base and Meridian.

The Sunny Rd water system (No. CA3901213) serves 30 residents through 15 service connections. The system is operated by a single well located on the property (Well #2). Prior to the operation of Well #2, the system received water from a well that was decommissioned and destroyed in September 2004.

Century MHP is in San Joaquin County, approximately 0.1 miles outside the City limits. The physical address of the mobile home park is 3312 East Sunny Road, Stockton, CA 95215 and is located near the intersection of Sunny Road and Kingsley Road. The Assessor’s Parcel Number for this address is 181-12- 32 in Section 28, Township 1, North Range 7 East, of the Mount Diablo Base and Meridian.

The Century MHP water system (No. CA3900579) serves a current population of approximately 56 people, with 20 active service connections. The water system consists of two (2) groundwater wells (Well #5 and a standby well), two (2) 200-gal pressure tanks, and distribution piping. Well #5 is approximately 325 feet deep and equipped with a 2-hp submersible pump. The standby well is approximately 180 feet deep. Well #5 is tested quarterly for arsenic levels and has exceeded the MCL for arsenic since 2008, with an average concentration of 13 ppb.

A map of the existing facilities for the Century MHP and Sunny Rd property can be found in Attachment A. Both water systems are under the jurisdiction of the San Joaquin County Environmental Health Department Drinking Water Program.

In addition to the Century MHP and Sunny Rd property, the Project will allow residences along Sunny Rd to connect with the City’s distribution system. One resident has expressed interest in connecting with the City distribution. The City of Stockton will pursue service agreements with the following:
x 3509 Sunny Rd.

The project will include the construction of laterals to the residence along Sunny Rd. The construction will include the abandonment of the existing private well (per County specifications). Connection to the City’s distribution system with a Reduced Pressure Back Flow Prevention device and flow meter per City Standards. The contractor will ensure that all existing landscaping/infrastructure is properly restored.

In addition to providing water services to the 3509 Sunny Rd residence, it is recommended that the City install limited water service infrastructure in the public right-of-way where residents have previously

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
2 considered a connection. In these cases, the project will include a Corp Stop 1” service line with a capped and locked angle meter stop inside a water meter box to the following residences:
x 3401 Sunny Rd.
x 3419 Sunny Rd.
x 3440 Sunny Rd.
2 Project Description
Century Mobile Home Park (Century MHP) in combination with the Sunny Rd property have received Proposition 1 funding (Agreement No. D1612806) to assist their systems in meeting safe drinking water standards of domestic water supply. Historically, Century MHP received Proposition 84 funding (Agreement No. 84-12C102) as the project progressed project funding changed to a Proposition 1 contract with the State Water Board, Division of Financial Assurance, under a Technical Assitance Work Plan (AR 5643). Historically, both water systems have exceeded the State of California’s (State’s) arsenic Maximum Contaminant Level (MCL). Additionally, Century MHP has previously exceeded the nitrate MCL.

Century MHP had explored the use of different wells and was able to meet the nitrate MCL, however, Century MHP continues to exceed arsenic concentrations. The water system is required to achieve compliance with applicable requirements of the Safe Drinking Water Act, including compliance with the primary MCLs for arsenic of 10 parts per billion (ppb) and nitrate of 45 milligrams per liter, as prescribed within CCR Title 22. On May 23, 2008, the San Joaquin County Environmental Health Department (SJEHD) issued a Notice of Non-Compliance Federal Arsenic MCL Violation letter. The letter required Century MHP to develop a plan to provide water that meets the arsenic MCL. A table of water quality monitoring for the last two years can be found in Attachment B.

The Sunny Rd property received a notice of violation for arsenic levels higher than the MCL of 10 ppb. The system continues to be in violation of arsenic MCL’s. The most recent notice of violation was sent from San Joaquin County Environmental Health on November 28, 2017. The Sunny Rd water system is required to develop plans to comply with the arsenic MCL limit. A table of water quality monitoring for the last two years can be found in Attachment B.

The purpose of this engineering report is to evaluate the potential of consolidating the Century MHP and Sunny Rd water systems with the City of Stockton (City) water system. The consolidation evaluation has considered the following factors:
x Century MHP potable water demands
x Silvia Avalos estimated potable water demands
x Distance to the nearest City point of connection
x Estimated cost of improvements required for consolidation (pipeline, meter, valves, connection fees, etc.)
x Acceptability of consolidation to the City

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
3 3 Alternative Solutions
There are three reasonable alternatives for the water systems to consider. Due to the proximity of the City water distribution line in Frontage Rd. The water systems could extend the 12” water line along Frontage and Sunny Rds. This option provides a permanent solution to MCL violations. The initial cost of installation is high, but the operations and maintenance fees will be limited to the City water rates. If the systems consolidate with the City water distribution, then the existing wells well need to be decommissioned and abandoned.

The second option is for the water systems to consolidate with each other. Since neither of the water systems meets the MCL limit they would need to install a treatment plant. This alternative would afford flexibility in the design and maintenance of the treatment plant. A combined water system would provide redundancy in the now individual wells. The downside to this option is high initial costs and high continued operational costs. This option also does not account for future variability in water quality that the treatment plant would be required to meet.

Finally, each water system can construct individual treatment plants for their properties. This option has the highest cost but greatest flexibility in design. Ultimately this is a poor alternative since the first two options have a lower cost.

Given the alternatives for meeting the arsenic MCL’s it is recommended that the water systems consolidate with the City distribution main in Frontage Rd. This option will have the lowest cost and not require development of new treatment systems for the properties. 4 Consolidation Feasibility
This section describes anticipated conditions and improvements for the Century MHP and the Sunny Rd Property to consolidate with the City. The evaluation considers how effectively consolidation meets the water quality requirements and the estimated cost and time for implementation.

The Municipal Utilities Department (MUD) of the City of Stockton provides water services to the residents and businesses in the north and south Stockton areas. California Water Service (CalWater), a private company, is the provider for most of central Stockton. The location of Century MHP is closest to the MUD service area. Approximately 25 percent of the City’s water supply originates from groundwater wells with the remaining water supply from treated surface water supplied by the Stockton East Water District (SEWD) and the Delta Water Treatment Plant. The 2018 Drinking Water Quality Report issued by the City indicates that the City’s water supply meets all State water quality requirements.

Consolidation of the Century MHP water system with the City would require the installation of a new water line to an existing City-owned water main. A review of the City’s distribution system shows the nearest water main adequately sized for the proposed connection is a 12-inch main on the SR-99 frontage road which terminates on the north side of Weber Slough.

Century MHP and the Sunny Rd property will each be responsible for connections to City water main extensions along E Sunny Rd and Kingsley Rd. Prior to connections, Century MHP and Sunny Rd property

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
4 will need to abandon and decommission their existing wells. The three wells to be decommissioned will need to follow San Joaquin County Well Standards Section 6 on the destruction of wells. In addition to decommissioning their existing wells, the systems will need to be properly disinfected and be updated to conform with all City standards. Of paramount importance, the properties will need to install City approved reduced pressure backflow prevention devices. Finally, each property will surrender their domestic water supply permits and connect with the restructured City distribution system.

Century MHP has received multiple “will serve” letters from the City, since the last letter expired on November 2nd, 2018 the current letter is under development by City. Since the City has been involved in this process it is expected that the new letter will be similar to the previous letters. The previous letter permits Century MHP to connect to the City’s water system if the following is completed:

1. A conditional utility service agreement for future annexation to the City on demand by the City is signed.

2. Century MHP extends the 12-inch water main under Weber Slough, south on the SR-99 frontage road to the southerly property line and east to the eastern property line of the subject property and all other required masterplanned utilities, in accordance with applicable City and County standards. Century MHP is responsible for all costs associated with the design and construction of the water main extension.

3. Payment of connection fees.

4. Acquisition of all applicable permits including a City encroachment permit, County encroachment permit, and any other Federal, State, and/or local jurisdictional permits.

5. Local Agency Formation Commission of San Joaquin County (LAFCO) review, fees, and approval.

6. Completion of any General Plan Amendments.

A copy of the expired “will serve” letter and historical correspondence with the City is provided in Attachment B. A new “will serve” letter is being prepared by the City and is not included in this report.

The letter will be the fourth “will-serve” letter from the City. The first, second, and third letters expired on July 7, 2013, and July 1, 2015, and November 2, 2018, respectively. 5 Water Demands
This section presents the water needs of the properties for an average day, maximum day, and peak-hour use. Water use data for Century MHP is summarized in Table 1. Table 1 includes estimates for Average Day Demand (ADD), Maximum Day Demand (MDD) and Peak Hour Demand (PHD). Calculations of water use are based on monitoring data from Nov 2011 to Nov 2012. For this time period, the maximum average flows were recorded in the month of May. Using recorded flows from May as the ADD, the MDD and PHD can be estimated using peaking factors from the City of Stockton Master Plan [1]. The estimates indicate an MDD of 6,900 gallons per day (gpd) and a PHD of 12 gallons per minute (gpm) for Century MHP.

No recorded data is available for the Sunny Rd water system. The Master Plan presents water use estimates for various land use types for new construction. Of the five land-use factors presented in the Master Plan, the most appropriate category is multi-family residential. Since the Sunny Rd property is 2 acres, the estimated ADD is 9,300 gpd. Applying City peaking factors, the MDD was found as 15,800 gpd.

PHD was found to be 22.5 gpm. Flow estimates can be seen in Table 2.

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
5 The City requires all new distribution systems be able to provide minimum velocity, head loss, and pressure under various design scenarios. Multi-family residential land use requires, the distribution main to provide 3,000 gpm for three hours of fire flow. In the Master Plan West Yost and Associates performed an analysis of existing City distribution systems. Per Figure 7-4 of the City Master Plan provided in this report as Figure 1, pressures along Arch Rd under PHD were greater than 55 psi during PHD. Using 55 psi at Arch Rd under PHD, the minimum pressure in the system would be 53.5 psi experienced at the Sunny Rd property. When evaluating the MDD and fire flow scenario, the Master Plan only presents the pressure around Arch Rd was greater than 20 psi. The results of the two control scenarios can be seen in Table 3.

The distribution mains along Frontage and E Sunny Rd meet city requirements in both velocity and head loss. In the absence of pressure data along Frontage Rd, design checks based on pressure were limited to PHD flow.

Table 1 - Century MHP Water Use Data
Time Period
Days
in time
period
Gallons
used,
(gal)
Average Day
Demand,
(gpd)a
Maximum
Day Demand,
(gpd)b
Peak Hour
Demand,
(gpm)c
11/27/11 - 12/15/11 18 49,940 2,774 4,717 11.5
12/15/11 - 1/15/12 31 106,900 3,448 5,862 14.2
1/15/12 - 2/19/12 35 79,830 2,281 3,877 9.4
2/19/12 - 3/22/12 32 77,203 2,413 4,101 10.0
3/22/12 - 4/23/12 32 86,627 2,707 4,602 11.2
4/23/12 - 5/23/12 30 92,616 3,087 5,248 12.8
5/23/12 - 6/23/12 31 118,789 3,832 6,514 15.8
6/23/12 - 7/22/12 29 89,105 3,073 5,223 12.7
7/22/12 - 8/25/12 34 106,852 3,143 5,343 13.0
8/25/12 - 9/23/12 29 79,817 2,752 4,679 11.4
9/23/12 - 10/23/12 30 87,382 2,913 4,952 12.0
10/23/12 - 11/23/12 31 76,110 2,455 4,174 10.1
a Average Day Demand = Gallons used/days in time period b Maximum Day Demand = ADD x 1.7 [2]
c Peak Hour Demand = MDD/(24·60) x 3.5 [2]
Table 2 – Sunny Rd Property Water Use Data
Demand Factor
(gpd/ac)
Area
(ac)
Average Day
Demand,
(gpd)a
Maximum
Day Demand,
(gpd)b
Peak Hour
Demand,
(gpm)c
4,642d 2.00 9,266 15,752 22.5
a Average Day Demand = Gallons used/Days in time period b Maximum Day Demand = ADD x 1.7 [2]
c Peak Hour Demand = MDD/(24·60) x 3.5 [2]
d Potable Water Master Plans Supplement/Master Plan Multi-Family Residential demand factor

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
6 The Master Plan requires distribution system services with more than 25 connections to have looped connections. Looped connections provide better distribution and transient mitigation. However since, both the Century MHP and Sunny Rd property have less than 25 connections each, they are allowed singlepoint connections. It is expected that the extended water mains will have a useful life of 35 to 40 years.

Table 3 - Century MHP and Sunny Rd Control Scenarios
Parameter MDD + Fire Flow PHD
Requirement Design Requirement Design
Velocity (ft/s) < 10.0 8.9 < 7.0 0.1
Head loss (ft/1,000ft) < 10.0 9.6 < 7.0 0.0
Pressure (psi) > 20.0 — > 45.0 53.5

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
7 Figure 1 - Water Pressure Under PHD as Evaluated by West Yost and Associates [1]

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
8 It is approximately 2,000 feet of pipe (1,100 feet of pipe from the existing main to the southerly property line of Century MHP and 900 feet of pipe from the SR-99 frontage road to the eastern property line of Sunny Rd) of 12-inch water pipe will be necessary to meet the City requirements. Four existing wells will need to be abandoned before connection to the City distribution system. These wells include one private residence, both the Century Mobile Home Park existing wells and the Sunny Rd existing well. Existing wells will need to be abandoned per County specifications. The 12-inch water alignment will be in the City rightof-way and County right-of-way. The total project cost is estimated to be $1,421,588. The construction portion of the Project is estimated to cost $990,700 and includes a 10% construction contingency.

Construction of the water main extension is estimated to last 4-6 months. Additional costs for permits and regulatory fees for the Project are estimated to be $125,318. Table 4 provides a detailed breakdown of the Project cost estimate.

City and regulatory agencies were consulted to project requirements associated with the construction of the water line and establishment of City water service to Century MHP. Table 5 lists the responses from the agencies who were contacted as part of this Consolidation Feasibility Study. Attachment G includes copies of permit applications and instructions for applicable regulatory agencies.

Table 4 - Project Cost Estimate
Item Unit Quantity Unit Cost, $ Total Unit
Cost, $
Mobilization and Staging ls 1 43,000 43,000
Connections to Existing System ea 1 13,000 13,000
Abandonment of Existing Wells ea 4 12,000 48,000
12" Class 200 PVC Piping within C.O.S. lf 506 250 126,500 12" Class 200 PVC Piping within S.J.C. lf 1350 250 337,500 12" Class 200 FPVC Piping within S.J.C. lf 147 300 44,100 12" Butterfly Valve w/ Valve Box ea 11 6,500 71,500
Residential Laterals w/ Meter ea 1 19,000 19,000
Residential Lateral w/ Stub Out ea 3 7,000 21,000
Fire hydrants 2 ea 6 14,000 84,000
Permanent Blow Off Valves ea 2 6,500 13,000
Service Connections w/ Meters ea 2 32,000 64,000
Erosion Control ls 1 38,900 38,900
Traffic Control days 21 3,200 67,200
Estimated Construction Cost 990,700
10% construction contingency 99,070
Construction Cost Subtotal 1,089,770
Permits and Applications 125,318
City Administration Cost 16,500
Preparation of bid documents 50,000
Consultant assistance during bidding 25,000
Engineering services during construction 25,000
Construction management 90,000
Estimated project cost 1,421,588

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
9 Table 5 - City and Regulatory Agency Responses
Agency Summary of information provided:

City of Stockton, MUD City provided a "will-serve" letter, dated July 1, 2013. City was made aware of timeline for preparing a draft water service agreement by August 24, 2013 and language which needs to be included in the water service agreement, per the Guidelines for Consolidation Projects (Proposition 1 Version) issued by the California Department of Public Health Safe Drinking Water State Revolving Fund. Required language for the water service agreement requirements could be added to the City's standard Conditional Annexation Agreement and will need approval from the City Attorney's Office.

City of Stockton,
Community Development
Department, Planning &
Engineering Services
Division
Improvement plans for the water line will need to be submitted. A City encroachment permit will be needed for the water line. The encroachment permit has a base fee of $523; inspection fee of 3.5% of the engineer's estimate from the improvement plan review; a tech fee of

7.5% of the base fee + inspection fee; and a CRS fee of 2% of the base fee + inspection fee.

San Joaquin County,
Permit Division
The County encroachment permit application can be downloaded from the County's website. Drawings, cross-sections, and trench backfill sections should be provided. For this Project, the permit fee is estimated to be approximately 16,800. Plans should include traffic control; reference Caltrans standards. Four sets of drawings should be provided.

Submit plans at the 90% design stage. No work is allowed on County roads between Nov. 1 through March 31. Plan review may take 4-6 weeks, overall. If the area is going to be repaved before the Project begins, the Project will need to include replacing all of the pavement for the road.

San Joaquin County Flood
Control
A watercourse encroachment permit will be required for the crossing of Weber Slough. The permit fee is $350, plus additional costs.

Central Valley Flood
Protection Board
A Central Valley Flood Protection Board permit is not required for the Weber Slough crossing. Weber Slough is not listed in Table 8.1 of the California Code of Regulations Title 23 Waters.

California Department of
Fish and Wildlife (DFW)
DFW should be notified of the slough crossing per Code 1602.

Notification forms are available on the department's website. Following submission of the notification form, the DFG will determine if permits are required. Environmental work should be completed. Plan for 90 days to get draft agreement. Final permit is good for 5 years.

United States Army Corps
of Engineers
Environmental review will be key to determining if the Project falls under the jurisdiction of the Army Corps. Any wetland or water of the U.S. falls under jurisdiction of the Army Corps.

San Joaquin Local Agency
Formation Commission
(LAFCO)
LAFCO approval will be needed for this Project. City will be the applicant for providing the service and is familiar with the process for obtaining LAFCO approval. Typically, City will provide applicant with the paperwork to complete and then will submit the paperwork to LAFCO for approval.

Plan for 60 days to obtain approval. Process could be expedited if letter is provided regarding water quality issues. Fee is $300 per unit.

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
10 6 Proposed Schedule
Project will be completed prior to three years from the funding agreement execution date. Total construction time for the project is estimated to be 246 working days or 11 ½ months. An itemized project schedule has been included as part of Attachment E.
7 References
[1] Duncan, Charles T., West Yost and Associates Consulting Engineers, City of Stockton Water Master Plan, July 2008.
[2] Johnston, Patrick., West Yost and Associates Consulting Engineers, Stockton General Plan Update—Potable Water Master Plan Supplement, December 2017.

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
A

ATTACHMENT A

MAP OF EXISTING FACILITIES

ATTACHMENT B

DOMESTIC WATER LINE

SILVIA AVALOS PROPERTY
1" = 100'
0 100 200
SCALE:

SUNNY ROAD

RIGHT OF WAY

SILVIA AVALOS

PROPERTY
WELL 2
PARCEL
JANUARY 2020
602 LYELL DRIVE, MODESTO, CA 95356 PH. 209.322.1820

CENTURY MHP

CENTURY MHP
CA 99 SOUTH
CA 99 NORTH

KINGSLEY RD
LEGEND
WELL

APPROXIMATE LOCATION OF

SILVIA AVALOS WATER SYSTEM
TWO 200 GAL

POTABLE WATER

STORAGE TANKS

SEPTIC TANK AND

LEECH FEILD

CENTURY MHP AND SILVIA

AVALOS WATER

CONSOLIDATION

APPENDIX A - MAP

OF EXISTING UTILITIES

LAYOUT OF CENTURY

MHP WATER SYSTEM

UNKNOWN
3401 3419 3509
3440

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
B

ATTACHMENT B

DOCUMENTS JUSTIFYING RANKED PROBLEM
“WILL SERVE” LETTER FROM CITY OF STOCKTON

CENTURY MHP NOTICE OF VIOLATION

SILVIA AVALOS NOTICE OF VIOLATION

CENTURY MHP WATER QUALITY DATA

SILVIA AVALOS WATER QUALITY DATA

ATTACHMENT B

ATTACHMENT B
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ATTACHMENT B
Water Quality Data for 2 years Century MHP
— indicates no data available
6/11/2019 3/7/2019 12/5/2018 11/3/2018 9/7/2018 8/13/2018 6/4/2018 5/2/2018 3/2/2018 2/7/2018 12/6/2017 9/11/2017 7/19/2017 6/21/2017 3/8/2017 Arsenic 10 2 Pg/L 14 16 15 — 14 — 16 — 14 — 15 12 — 15 13Nitrate + Nitrite 10 0.4 mg/L — — — — — — — — — — 0 — — — —Nitrite 1 0.4 mg/L — — — — — — — — — — 0 — — — —Nitrate 10 0.4 mg/L — — 0.4 — — — — — — — 0 — — — —Mercury 2 1 Pg/L — — — — — — — — — — 0 — — — —Selenium 50 5 Pg/L — — — — — — — — — — 0 — — — —Aluminum 1000 50 Pg/L — — — — — — — — — — 0 — — — —Antimony 6 6 Pg/L — — — — — — — — — — 0 — — — —Silver 100 10 Pg/L — — — — — — — — — — 0 — — — —Nickel 100 10 Pg/L — — — — — — — — — — 0 — — — —Thallium 2 1 Pg/L — — — — — — — — — — 0 — — — —Lead 0 5 Pg/L — — — — — — — — — — 0 — — — —chromium (total) 50 10 Pg/L — — — — — — — — — — 0 — — — —Cadmium 5 1 Pg/L — — — — — — — — — — 0 — — — —Beryllium 4 1 Pg/L — — — — — — — — — — 0 — — — —Barium 1000 100 Pg/L — — — — — — — — — — 140 — — — —Fluride (natural-source) 2 0.1 MG/L — — — — — — — — — — 0 — — — —Specific Conductance 1600 0 US — — — — — — — — — — — — 240 — —M,P-Xylene 0 0.5 Pg/L — — 0 — — — — — — — — — — — —Trichlorotrifluoroethane 1200 10 Pg/L — — 0 — — — — — — — — — — — —Xylenes (total) 1750 0.5 Pg/L — — 0 — — — — — — — — — — — —O-xylene 0 0.5 Pg/L — — 0 — — — — — — — — — — — —Styrene 100 0.5 Pg/L — — 0 — — — — — — — — — — — —Cis-1,2-dichloroethylene 6 0.5 Pg/L — — 0 — — — — — — — — — — — —Methyl-tert-butyl-ether (mtbe) 13 3 Pg/L — — 0 — — — — — — — — — — — —Trichloroethylene 5 0.5 Pg/L — — 0 — — — — — — — — — — — —Vinyl chloride 0.5 0.5 Pg/L — — 0 — — — — — — — — — — — —1,4-Dichlorobenzene 5 0.5 Pg/L — — 0 — — — — — — — — — — — —1,3-Dichloropropene (total) 0.5 0.5 Pg/L — — 0 — — — — — — — — — — — —1,2,4-Trichlorobenzene 5 0.5 Pg/L — — 0 — — — — — — — — — — — —Trans-1,2-dichloroethylene 10 0.5 Pg/L — — 0 — — — — — — — — — — — —1,2-Dichloropropane 5 0.5 Pg/L — — 0 — — — — — — — — — — — —1,2-Dichlorobenzene 600 0.5 Pg/L — — 0 — — — — — — — — — — — —1,2-Dichloroethane 0.5 0.5 Pg/L — — 0 — — — — — — — — — — — —1,1,2,2-Tetrachloroethane 1 0.5 Pg/L — — 0 — — — — — — — — — — — —1,1,2-Trichloroethane 5 0.5 Pg/L — — 0 — — — — — — — — — — — —1,1,1-Trichloroethane 200 0.5 Pg/L — — 0 — — — — — — — — — — — —1,1-Dichloroethylene 6 0.5 Pg/L — — 0 — — — — — — — — — — — —1,1-Dichloroethane 5 0.5 Pg/L — — 0 — — — — — — — — — — — —Trichlorofluoromethane freon 11 150 5 Pg/L — — 0 — — — — — — — — — — — —Tetrachloroethylene 5 0.5 Pg/L — — 0 — — — — — — — — — — — —Dichloromethane 5 0.5 Pg/L — — 0 — — — — — — — — — — — —Ethyl benzene 300 0.5 Pg/L — — 0 — — — — — — — — — — — —Monochlorobenzene 70 0.5 Pg/L — — 0 — — — — — — — — — — — —Benzene 1 0.5 Pg/L — — 0 — — — — — — — — — — — —Toluene 150 0.5 Pg/L — — 0 — — — — — — — — — — — —Carbon tetrachloride 0.5 0.5 Pg/L — — 0 — — — — — — — — — — — —1,2,3-Trichloropropane (1,2,3-TCP) 0.005 0.005 Pg/L — — — 0 — 0 — 0 — 0 — — — — —Ethylene Dibromide (EDB) 0.5 0.02 Pg/L — — — — — — — — — — 0 — — — —Dibromochloropropane (DBCP) 0.2 0.01 Pg/L — — — — — — — — — — 0 — — — —Perchlorate 6 4 Pg/L — — — — — — — — — — — — 0 — — Description Results Unit DLR MCL

ATTACHMENT B
Water Quality Data for 2 years Silvia Avalos Properties — indicates no data available
4/1/2019 1/30/2019 1/15/2019 10/5/2018 7/6/2018 4/4/2018 1/4/2018 7/5/2017 4/5/2017 1/11/2017 Arsenic 10 2 Pg/L 13 10 13 12 13 13 12 12 13 13Nitrate + Nitrite 10 0.4 mg/L — 0 0.2 — — — — — — —Corrosivity 0 0 — 12 10.1 — — — — — — —Turbidity 5 0.1 NTU — 0.28 0.2 — — — — — — —Asbestos 7 0.2 MFL — 0 — — — — — — — —Alachlor 2 1 Pg/L — 0 — — — — — — — —Mercury 2 1 Pg/L — 0 1 — — — — — — —Hydroxide Alkalinity 0 0 MG/L — 0 10 — — — — — — —Langelier Index @ 60 C 0 0 — -0.3 — — — — — — — —TDS 1000 0 MG/L — 170 220 ———————Simazine 4 1 Pg/L — 0 — — — — — — — —Atrzine 1 0.5 Pg/L — 0 — — — — — — — —Foaming Agents (MBAS 0.5 0 MG/L — 0 0.05 — — — — — — —Selenium 50 5 Pg/L — 0 5 — — — — — — —Aluminum 1000 50 Pg/L — 0 50 — — — — — — —Antimony 6 6 Pg/L — 0 6 — — — — — — —Zinc 5000 50 Pg/L — 0 50 — — — — — — —Silver 100 10 Pg/L — 0 10 — — — — — — —Nickel 100 10 Pg/L — 0 10 — — — — — — —Thallium 2 1 Pg/L — 0 1 — — — — — — —Manganese 50 20 Pg/L — 99 50 — — — — — — —Lead 0 5 Pg/L — 0 5 — — — — — — —Iron 300 100 Pg/L — 0 100 — — — — — — —Copper 1000 50 Pg/L — 0 50 — — — — — — —chromium (total) 50 10 Pg/L — 0 10 — — — — — — —Cadmium 5 1 Pg/L — 0 1 — — — — — — —Beryllium 4 1 Pg/L — 0 1 — — — — — — —Barium 1000 100 Pg/L — 130 128 — — — — — — —Fluride (natural-source) 2 0.1 MG/L — 0 0.1 — — — — — — —Sulfate 500 0.5 MG/L — 0 0.5 — — — — — — —Chloride 500 0 MG/L — 7.9 61 — — — — — — —Potassium 0 0 MG/L — 0 59 — — — — — — —Sodium 0 0 MG/L — 28 30 — — — — — — —Magnesium 0 0 MG/L — 4.5 5 — — — — — — —Calcium 0 0 MG/L — 14 14 — — — — — — —Hardness CaCO³ 0 0 MG/L — 54 55.5 — — — — — — —Nitrite 1 0.4 mg/L — 0 0.4 — — — — — — 0.4Nitrate 10 0.4 mg/L — 0 0.4 — — — — — — 0.4Carbonate Alkalinity 0 0 MG/L — 0 10 ———————Bicarbonate Alkalinity 0 0 MG/L — 12 120 ———————Alkalinity as CaCO³ 0 0 MG/L — 100 100 — — — — — — —pH 0 0 — 8.1 6.6 — — — — — — —Specific Conductance 1600 0 US — 220 438 — — — — — — —Odor Threshold 3 1 Ton — 0 4 — — — — — — —Color 15 0 Units — 0 5 — — — — — — — Results MCL DLR Unit Description

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
C

ATTACHMENT C
MAP OF SYSTEM’S PROPOSED FACILITIES

ATTACHMENT B
12''W
12''W
12''W
12''W 12''W 12''W 12''W 12''W

DOMESTIC WATER LINE

SILVIA AVALOS PROPERTY

FIRE HYDRANT
BUTTERFLY VALVE 1" = 100'
0 100 200
SCALE:

SUNNY ROAD

RIGHT OF WAY

SILVIA AVALOS

PROPERTY

NEW FIRE

HYDRANT TYP

FROM CONNECTION TO THE CITY

OF STOCKTON FORCE MAIN NORTHOF WEBER SLOUGH

PERMANENT BLOW

OFF VALVE
PARCEL

CENTURY MHP AND SILVIA

AVALOS WATER

CONSOLIDATION
JULY 2019
602 LYELL DRIVE, MODESTO, CA 95356 PH. 209.322.1820

APPENDIX C - PROPOSED

PERMANENT BLOW

OFF VALVE

CENTURY MHP

CENTURY MHP
CA 99 SOUTH
CA 99 NORTH

KINGSLEY RD
LEGEND

APPROXIMATE LOCATION OF

CITY FLOW METER AND REDUCED

PRESSURE BACKFLOW PREVENTER
CONNECTION TO EX. BY OTHERS

APPROXIMATE LOCATION

OF CITY FLOW METER

AND REDUCED PRESSURE

BACKFLOW PREVENTER

CONNECTION TO

EXSITING BY OTHERS

EX WELL AND

STORAGE TO BE

DECOMMISSIONED

AND REMOVED BY
OTHERS

EX WELL TO BE

DECOMMISSIONED

AND REMOVED BY
OTHERS

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
D

ATTACHMENT D

DETAILED COST ESTIMATE

ATTACHMENT B
Prepared By: TCL
Checked By: JMB
Date: 11/30/2022
Item Unit Quantity Unit Cost, $ Total Unit Cost, $
Century MHP Obligations
Mobilization and Staging ls 1 43,000 43,000
Connections to Existing System ea 1 13,000 13,000
Abandon Existing Well ea 2 12,000 24,000
12" Class 200 PVC Piping within C.O.S. 1 lf 506 250 126,500 12" Class 200 PVC Piping within S.J.C. 1 lf 937 250 234,250 12" Butterfly Valve w/ Valve Box ea 7 6,500 45,500
Fire Hydrants 2 ea 4 14,000 56,000
Permanent Blow Off Valves ea 2 6,500 13,000
Service Connections w/ Meters ea 1 32,000 32,000
Erosion Control ls 1 28,000 28,000
Traffic Control days 15 3,200 48,000
Sunny Rd Obligations
Abandon Existing Well ea 1 12,000 12,000
12" Class 200 PVC piping within S.J.C. 1 lf 413 250 103,250 12" Class 200 FPVC piping within S.J.C.1 lf 147 300 44,100 12" Butterfly Valve w/ Valve Box ea 4 6,500 26,000
Fire Hydrants 2 ea 2 14,000 28,000
Service Connections w/ Meters ea 1 32,000 32,000
Residential Lateral w/ Stub Out ea 3 7,000 21,000
Erosion Control ls 1 10,900 10,900
Traffic Control days 6 3,200 19,200
Jack Lo Obligations
Abandon Existing Well ea 1 12,000 12,000
Residential Lateral w/ Meter ea 1 19,000 19,000
990,700
99,070
1,089,770
125,318
16,500
50,000
25,000
25,000
90,000
1,421,588
Permits Unit Quantity Unit Cost, $ Total Unit Cost, $
City of Stockton Encroachment Permit LS 1 11,000 11,000 City of Stockton Plan Check % Const. Cost 1 36,150 36,150 City of Stockton Water Connection Fee EA 2 12,500 25,000 LS 1 121 121 LF 1497 0.25 374 SJ Encroachment Permit LS 1 350 350 LS 1 116 116 LF 1497 0.53 793 SJ Plan Check LS 1 36,150 36,150 SJ Water Course Encroachment Permit LS 1 350 350 USACE Permit LS
California Dept of Fish and Wildlife LS 1 5,313 5,313 LAFCO OutͲOfͲAgency Service Agreement Fee ESFR 32 300 9,600 Total Permit/Fee: 125,318
Notes
1 Includes trenching and trench patch (does not include roadway/lane resurfacing or overlay) 2 Includes lateral and valves Engineering services during construction
Construction management
Estimated Project Cost
10% construction contingency
Construction Cost Subtotal
Permits and Applications
Preparation of bid documents
Consultant assistance during bidding
City Administration Cost
SJ Inspection feeͲPaved Frontage
602 Lyell Drive, Modesto, CA95356T: 209.322.1820F: 209.222.4088www.blackwaterͲeng.com City of Stockton Municipal Utilities Department
Estimated Construction and Project Cost for
Century Mobile Home ParkͲSunny Rd
Water System Consolidation with the COS
SJ Inspection feeͲPaved Utility Cut

28.71%

66.95%
Estimated Construction Cost
Engineering, Construction
Services, and
Administration

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
E

ATTACHMENT E

PROPOSED PROJECT SCHEDULE

ATTACHMENT B
2023
Apr May Jun Jul Aug Sep Oct Nov Dec Dec Jan
Bid Open
May 16
Notice to ProceedAug 14
Advertise
45 days
Award Contract
90 days
Construction
90 days
Final Acceptance
10 days
Project Closeout
5 days
Project Schedule ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
F

ATTACHMENT F

SUPPLEMENTAL INFORMATION FORM

ATTACHMENT B

ATTACHMENT B
Prop 1 Consolidation
Engineering Report
January 2023
G

ATTACHMENT G

PERMIT APPLICATION AND INSTRUCTION MATERIALS

FROM REGULATORY AGENCIES

UNITED STATES ARMY CORE OF ENGINEERS

SAN JOAQUIN COUNTY ENCROACHMENT PERMIT

SAN JOAQUIN COUNTY WATER COURSE PERMIT

LAFCO OUT OF SERVICE AGENCY AGREEMENT

CALIFORNIA DEPARTMENT OF FISH AND GAME

CITY OF STOCKTON ENCROACHMENT PERMIT

ATTACHMENT B

City Council and Concurrent AuthoritiesOctober 17, 2023

City Council and Concurrent Authorities
October 17, 2023