Sebastopol City Council
May 5, 2026

CITY OF SEBASTOPOL CITY COUNCIL
AGENDA ITEM REPORT FOR MEETING OF: May 5, 2026
=========================================================================================== To: Honorable Mayor and City Councilmembers
From: Oriana Hart, Public Works Director
Toni Bertolero, Public Works Engineer
Responsible Department: Public Works
Subject: Water Master Plan Update Report
=========================================================================================== RECOMMENDATIONS:

That the City Council receive the final draft Water Master Plan Update prepared by GHD, Inc., and provide any comments prior to finalization.

PROCESS OF AGENDA ITEM:
a. Presentation of the agenda item by the Public Works Director b. Introduction of Consultant
c. Questions and Discussion from Councilmembers
d. Public Comment Period
e. Council Deliberation and Motion
EXECUTIVE SUMMARY:

The City initiated the Water Master Plan Update (CIP #0821-23.09) in March 2025 to update the City’s 2005 Water Master Plan and identify near- and long-term capital improvements needed to maintain a reliable and resilient water system. The final draft of the report is now complete and included as Attachment 1.

The updated plan reflects current system conditions and evaluates water supply, storage, distribution, and water quality. It identifies infrastructure deficiencies and operational needs and includes a prioritized list of capital improvement projects with planning-level cost estimates to guide investment over the next 5- and 10-year planning horizons.

The analysis indicates that while the system generally meets current demand, there are localized deficiencies in pressure and fire flow. Much of the system infrastructure is aging and will require phased replacement. The City continues to rely entirely on groundwater sources, with ongoing treatment needs, and the plan identifies a set of capital projects focused on improving reliability, addressing aging assets, and maintaining regulatory compliance.

BACKGROUND
On March 4, 2025, the City Council approved a contract amendment with GHD, Inc. for the preparation of the Water Master Plan Update (CIP #0821-23.09). The scope of work included data collection and review, evaluation of the existing system, development of 5-year and 10-year capital improvement programs, and preparation of an updated master plan report.

Due to limitations with the City’s legacy hydraulic model, the update focused on using the City’s GIS data, historical leak records, field observations, and fire flow testing to identify infrastructure deficiencies and prioritize improvements. The resulting plan provides a practical and focused approach to system planning in a largely built-out community, where the primary need is replacement of aging infrastructure rather than expansion for growth.

DISCUSSION:

A draft list of capital improvement projects was previously presented to the Budget Committee and City Council, and the final draft report does not include substantive changes to that project list.

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STAFF ANALYSIS:

The Water Master Plan Update identifies approximately $10.8 million in recommended capital improvements over the planning horizon based on planning level cost estimates. These projects are primarily focused on addressing aging infrastructure, improving system reliability, and maintaining regulatory compliance.

The recommended projects include:
• Well 4 Replacement
• Pleasant Hill Loop
• Structural Assessment of Existing Water Tanks
• Seismic Retrofit Design for Existing Water Tanks
• Gwendolyn Place Water Service Connection Replacement
• Installation of Automated Flow Meter
• 500 South Main Street Watermain Replacement
• Replacement of Existing Pressure Reducing Valves
• Well 6 Water Treatment System
• Valley View Drive Water Service Connection Replacement • Covert Lane CI Watermain Replacement
• Ellis Court CI Watermain Replacement
• Installation of Isolation Valves
• Painting and Relining of Existing Water Tanks
While the current Capital Improvement Program includes funding for ongoing water system replacement projects, additional projects identified in the Master Plan will need to be prioritized and incorporated into future CIP cycles.

BUDGET COMMITTEE AND ENTERPRISE FUND OVERSIGHT COMMITTEE: The committees held a joint meeting and received a presentation from the consultant. The committee requested that the consultant include cost estimates for non-routine repairs and items, and provide a prioritized list ranked from highest to lowest need.

CITY COUNCIL GOALS/PRIORITIES/AND OR GENERAL PLAN CONSISTENCY:

This agenda represents the City Council goals/priorities as follows:
• Goal 3 – Infrastructure. Maintaining high quality infrastructure, facilities and services includes repairing/ replacing outdated city facilities, improving streets, stormwater and wastewater infrastructure.

This agenda item represents the City Council General Plan Consistency (if applicable):
• Community Services and Facilities (CSF 1-5). Require development, infrastructure, and long-term planning projects to be consist with all applicable City infrastructure plans, including the Water Master Plan.

FISCAL IMPACT:

There is no immediate fiscal impact associated with receiving and filing the Water Master Plan Update (CIP #0821-

23.09).

The Plan identifies approximately $10.8 million in recommended capital improvements over the next 5- to 10-year planning horizon. These projects are not currently fully funded and will need to be prioritized and incorporated into future Capital Improvement Program budgets.

Implementation of these projects is anticipated to be funded through the Water Capital Fund and supported by previously adopted water rate increases. An implementation schedule is outlined in the Water Master Plan.

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COMMUNITY OUTREACH:

This item has been noticed in accordance with the Ralph M. Brown Act and was available for public viewing and review at least 72 hours prior to the scheduled meeting date.

As of the writing of this staff report, the City has not received any public comment on this item. However, if staff receives public comment from interested parties following the publication and distribution of this staff report, such comments will be provided to the City Council as supplemental materials before or at the meeting. In addition, public comments may be offered during the public comment portion of this item.

RESTATED RECOMMENDATION:

Receive and file the final draft Water Master Plan Update (CIP #0821-23.09) and provide any comments prior to finalization.

CITY COUNCIL OPTION(S):

City Council can request revision to the draft plan for the projects proposed. Discussion of any projects other than those listed would require a separate agenda item to be returned to a future City Council meeting.

ATTACHMENTS:

1. Final Water Master Plan

APPROVALS:

Department Head Approval: Approval Date: 04/14/2026
CEQA Determination (Planning): Approval Date: 04/14/2026 The proposed action is Exempt from CEQA pursuant to §15306.

Administrative Services (Financial) Approval Date: N/A
Costs authorized in City Approved Budget: ☐ Yes ☐ No  N/A (see Fiscal Analysis) Account Code (f applicable) ___________________
City Attorney Approval: Approval Date: N/A
City Manager Approval: Approval Date: 04/21/2026
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Water Master Plan
Update
City of Sebastopol
April 29, 2026
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Project name City of Sebastopol- Water Master Plan Update Document title Water Master Plan Update | City of Sebastopol Project number 12658893
File name 12658893 ­ Water Master Plan Update (Final-v2).docx Status
Code
Revision Author Reviewer Approved for issue
Name Signature Name Signature Date
S3 1 Anjali Peter Abhishek
Kumar
Matt Kennedy
S4 2 Aldon Fung Abhishek
Kumar
Matt Kennedy
S4 3 Aldon Fung Abhishek
Kumar
Matt Kennedy 4/21/2026
S4 4 Aldon Fung Abhishek
Kumar
Matt Kennedy 4/29/2026
[Status
code]
GHD
Contact: Abhishek Kumar, Senior Water Resources Engineering Consultant | GHD Matt Kennedy, PE, Principal Engineer | GHD
2235 Mercury Way, Suite 150
Santa Rosa, California 95407, United States
T +1 707 523 1010 | F +1 707 527 8679 | E [email protected] | ghd.com The document may only be used for the purpose for which it was commissioned and in accordance with the Terms of Engagement for the commission.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update ES-1 Executive Summary
GHD was retained by the City of Sebastopol to update the City’s Water System Master Plan. The Master Plan Update consisted of:
– A study of the existing service area and land use plans; – An assessment of existing water sources, storage, water quality, and distribution; – An assessment of existing and future water demands;
– The development of a preliminary hydraulic computer model of the existing water distribution system; – An explanation of water system evaluation criteria;
– An evaluation of the existing and future water distribution, storage, and fire protection system; – Recommendations for water system improvements;
– An estimation of water system improvement costs.

This Water System Master Plan Update is intended as an instrument for planning water system improvements necessary to provide continued water supply to the City’s current and future population.

Given criteria, the City’s existing hydraulic model was updated using water production and usage statistics from 2018 to 2024, the General Plan, the Growth Management Ordinance and communication with Public Works and Planning Department staff. The hydraulic model was loaded and adjusted to reflect the City’s most recent yearly production data.

The model indicates that, under current conditions, there are a few areas in the City with low water pressure and low fire flows. Not all of these areas can be brought up to standards by increasing line size, but most of the areas can be brought up to standards and all areas can be improved. The report recommends fourteen (14) infrastructure projects, including new pipelines, pipe replacement, and valve and meter installations to address aging infrastructure, increase service pressures, and fire flows, as well as asset data monitoring. Estimates for each of these projects are also provided. These projects are summarized below:

1. Replacement of the City’s municipal Well #4 that has groundwater that has been contaminated and is required to be replaced.

2. Pleasant Hill Road water system connection loop from Pleasant Hill Tanks at Lynch Road to the intersection at Pleasant Hill Road at Mitchell Crescent.

3. Study of structural assessment of First Street Tank and Pleasant Hill Tanks.

4. Design for seismic retrofit and construction project for First Street Tank and Pleasant Hill Tanks.

5. Replace approximately 9 existing service connections with ¾-inch diameter HDPE service lateral pipes, along Gwendolyn place from the intersection of Litchfield Avenue.

6. Installation of automated flow meter for the Public Works Yard water filling station tower at Johnson Street to supply potable water to local customers.

7. Replace approximately 215 feet, 8-inch watermain along 500 South Main Street from the intersection of Gravenstein Highway South, south of Walker Avenue.

8. Replacing of the existing pressure reducing valves at Healdsburg Avenue, Fircrest Avenue, and at Dutton and Huntley Avenue.

9. Addition of water treatment system at Well #6 to remove arsenic from the water at the well.

10. Replace approximately 94 water service laterals using approximately 20 feet, ¾-inch diameter HDPE service lateral pipes, along Valley View Drive from the intersection of Ragel Avenue.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update ES-2

11. Replace approximately 360 feet 6-inch cast iron water line on Covert Lane between Norlee Street and Zimpher Drive.

12. Replace approximately 195 feet 6-inch diameter old cast iron pipe between Ellis Court and High School Road.

13. Installation of valves at different locations for system isolation during repair works at Parquet Street and Litchfield Avenue

14. Painting and relining of First Street Tank and Pleasant Hill Tanks.

The estimated costs of these projects are shown in the table below. The table includes estimated construction costs and total project costs, including design, environmental, administration, and construction management.

Table 1 Estimated Costs of Recommended Projects
Project
No./
Priority
Ranking of
Importance
Description Start
Year
Construction
Cost 1 Project Cost 2
1 High Well 4 Replacement 2027 $2,912,410 $3,352,000
2 High Pleasant Hill Loop 2027 $750,680 $952,780
3 High Structural Assessment of Existing Water
Tanks
2027 N/A $126,000
4 High Seismic Retrofit Study for Existing Water
Tanks
2027 N/A $141,750
5 High Gwendolyn Place Water Service Connection
Replacement
2027 $57,690 $73,240
6 High Installation of Automated Flow Meter 2027 $58,640 $74,430 7 High 500 South Main Street Watermain
Replacement
2027 $120,110 $152,460
8 High Replacement of Existing Pressure Reducing
Valves
2027 $202,350 $256,830
9 Medium Well 6 Water Treatment System 2030 $3,323,570 $3,635,700 10 Medium Valley View Drive Water Service Connection
Replacement
2030 $605,200 $682,870
11 Medium Covert Lane CI Watermain Replacement 2030 $210,190 $237,190 12 Medium Ellis Court CI Watermain Replacement 2030 $125,440 $141,550 13 Low Installation of Isolation Valves 2032 $148,500 $154,930 14 Low Painting and Relining of Existing Water Tanks 2032 $894,900 $827,490 Total $9,409,680 $10,809,220
Notes:
1 Considered construction cost with inflation or 4% annual escalation. 2 Included soft cost and construction cost without inflation or 4% annual escalation This report is subject to, and must be read in conjunction with, the limitations set out in Section 1 and the assumptions and qualifications contained throughout the Report.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update i Contents

1. Introduction 1

1.1 Background 1

1.2 Aims and Objectives 1

1.3 Master Plan Update 1

1.4 Conduct of Study 3

2. Study Area and Existing Water System 4

2.1 Existing Service Area and Land Use Plans 4

2.1.1 Land Use Plans 4

2.2 Zoning and General Plan’s Land Use Designation 5

2.3 Existing Water System 5

2.3.1 Historical Development 7

2.3.2 Existing Water Demands 8

2.3.3 Existing Water Sources 8

2.3.4 Raw Water Quality 13

2.3.5 Existing Transmission and Distribution System 14

2.4 Santa Rosa Plain Groundwater Sustainability Agency 17

3. Development of the Water System Model 19

3.1 Assumptions and Limitations 19

3.2 Steady-state Calibration 20

4. Water Demand Projections 23

4.1 Water Demand Conditions 23

4.2 Average Demands – Existing Conditions 23

4.3 Peaking Factors 24

4.4 Future 2045 Conditions Demands 24

5. Results of Water System Analyses 26

5.1 Evaluation Criteria 26

5.1.1 Distribution System 26

5.1.2 Fire Protection 26

5.1.3 Water Storage Reservoirs 27

5.1.3.1 Operational Storage 27

5.1.3.2 Equalization Storage 28

5.1.3.3 Fire Storage 28

5.2 Analyses of the Existing Water System 30

5.2.1 Working Service Pressures during Peak Hour Demands 30

5.2.2 Fire Protection 32

5.2.3 Reservoirs 34

5.3 Analysis of the Water System for Future Conditions 34

5.3.1 Working Service Pressures 34

5.3.2 Fire Protection 36

5.3.3 Reservoirs 38
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update ii

6. Recommended Water System Improvements 39

6.1 Water System Recommended Improvements: Existing Conditions 39

6.2 Best Operation and Maintenance Practices 45

7. Estimated Cost for Recommended Improvements 49

7.1 Cost Estimates 50
CIP 01: Well 4 Replacement 51
CIP 02: Pleasant Hill Loop 52
CIP 03: Structural Assessment of Existing Water Tanks 53 CIP 04: Seismic Retrofit Study for Existing Water Tanks 54 CIP 05: Gwendolyn Place Water Service Connection Replacement 55 CIP 06: Installation of Automated Flow Meter 56
CIP 07: 500 South Main Street Watermain Replacement 57
CIP 08: Replacement of Existing Pressure Reducing Valves 58 CIP 09: Well 6 Water Treatment System 59
CIP 10: Valley View Drive Water Service Connection Replacement 60 CIP 11: Covert Lane CI Watermain Replacement 61
CIP 12: Ellis Court CI Watermain Replacement 62
CIP 13: Installation of Isolation Valves 63
CIP 14: Painting and Relining of Existing Water Tanks 64 Table index
Table 1 Estimated Costs of Recommended Projects 2
Table 2 Summary of Reservoirs and Wells in the City. 7
Table 3 Annual Average Water Demand Based on Sales Data for the Year 2018-2024 8 Table 4 Well Data 11
Table 5 Water Source Issues and Studies 14
Table 6 Pipe Lengths by Materials 15
Table 7 Pipe Lengths by Year 15
Table 8 Existing Reservoir Details 17
Table 9 Modelled Pressure to Field Static Pressure Comparison 22 Table 10 Breakdown of the total water production and the ADD value used for the modelling. 23 Table 11 Peaking Factors 24
Table 12 Population of the City of Sebastopol from 2000 to 2020. 24 Table 13 Demand Projected for Future Conditions for Normal Demand Conditions 25 Table 14 Minimum Flows for Fire Protection Requirements 27 Table 15 Water Storage Requirements 28
Table 16 Reservoir Capacities versus Storage Requirements 34 Table 17 Reservoir Capacities versus Future Storage Requirements 38 Table 18 Recommended Improvements for the Water Distribution System 40 Table 19 Best Operation and Maintenance Practices 45
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update iii Figure index
Figure 1 Study area 2
Figure 2 Existing Water System 6
Figure 3 Santa Rosa Plain Groundwater Basins Map 9
Figure 4 Well and reservoir locations. 10
Figure 5 Well #4 levels. 11
Figure 6 Well #7 levels. 12
Figure 7 Well #8 levels. 12
Figure 8 Well #6 levels. 13
Figure 9 Locations of hydrants for calibration. 21
Figure 10 City's population from 2000 to 2045. 25
Figure 11 Water storage requirements for Zone 1 and Zone 2. 29 Figure 12 Modelled pressure under existing PHD condition. 31 Figure 13 Available fire flow at 20 psi under the existing MDD+FF condition. 33 Figure 14 Modelled pressure under future PHD condition. 35 Figure 15 Locations of hydrants above/below the required fire flow of 1,500 GPM, under the future MDD+FF condition. 37
Appendices
Appendix A City of Sebastopol Land Use Map
Appendix B Hydrant Flow Test Locations
Appendix C Hydrant Flow Test Results
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 1

1. Introduction
This report presents a comprehensive study of the City of Sebastopol’s water supply, storage, and distribution system.

It represents the latest in a series of studies conducted to establish the effects of existing and long-range demands on the system. The following sub-sections provide a modified history of the water system and background information regarding the development of this report.

1.1 Background
The City of Sebastopol (City) owns, operates, and maintains approximately 38 miles of water mains and pipelines, three (3) storage facilities, one (1) booster pump station, one (1) blending pump station, four (4) active groundwater wells, one (1) granular activated carbon treatment system, and two (2) arsenic treatment systems to produce, treat, and distribute water to the City’s water customers. Figure 1 shows the limits of the City of Sebastopol – the study area.

The City had identified the need to update its Water Master Plan, initially completed in 2005. Since the previous master plan study, most system improvements have focused on serving limited new developments within the City limits and replacing aging infrastructure that requires the most frequent repair. The City is mostly developed, and little new development potential remains that will draw new demand. The City’s water infrastructure, particularly pipelines and services, is aging and in need of renewal. Because the City is mostly developed, meeting new and growing demands is less of a concern. The hydraulic capacity to meet water demands and fire flows was checked, and improvements to meet them identified. Leveraging the recently completed water GIS enables a focused effort on capital projects that address aging infrastructure.

1.2 Aims and Objectives
This study aims to evaluate whether the City’s existing water infrastructure can meet water demands and fire flows in the existing and future horizons. To address this, the objective is to review and analyze the water supply sources, storage capabilities, and distribution capacity of the water system that the City owns and maintains for domestic, commercial, and firefighting uses. This study identifies system deficiencies and outlines existing system improvements necessary to meet current and 30-year projected demands (for the year 2045). From this information, improvement projects, costs, and construction phasing are addressed.

1.3 Master Plan Update
The efforts undertaken in this master plan update are as follows:
– Update the current Master Water Plan.
– Update the City’s water distribution system hydraulic model. – Simulate pressure and available fire flow for the City’s water distribution system. – Analyze and identify solutions to remedy current system deficiencies. – Analyze future demands, treatment, storage needs, and distribution modifications to support the build-out of the City.
– Develop recommended improvement projects.
– Provide cost estimates for all identified improvement projects.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 2 Figure 1 Study area
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 3

1.4 Conduct of Study
The information developed in this report is based on data provided by the City, including existing water demand, water production, reports, maps, utility information, and fire flow test data. The City’s operational staff identified problem areas within the water system that required attention to address aging infrastructure, redundancy, and performance of the existing water system.

Surface elevations were obtained from the digital terrain model (DTM) in the Sonoma Countywide Lidar Products, produced by NV5 Geospatial and Tukman Geospatial, and transferred to the hydraulic modelling program.

U.S. Census data were used to determine the projected population densities within the City and the projected water needs for the land uses. The projected water requirements and flows were evaluated to determine the adequacy of water main sizes, pump station sizes, and storage facilities for current and future conditions. Hydraulic modelling of the distribution system was performed for each of the two pressure zones based on maximum hour demands and fire flow events. Fire flow criteria were based on the minimum fire flow requirement as suggested in the 2025 California Fire Code.

Facility improvement projects with implementation plans required to meet current and future storage demands and production needs are recommended. The capital costs required for these improvements are presented as part of this report.

Sections 2, 3, and 4 of this report discuss the study area, the existing water supply, storage, and distribution system, the development of projected water demands the generation of computer model analysis. Sections 5, 6, and 7 discuss the results of hydraulic modelling, recommended system improvements, costs, and phasing.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 4

2. Study Area and Existing Water System
This section describes the Sebastopol Municipal Water System (SMWS) service area, the status of land use planning for the area, and the SMWS distribution system.

2.1 Existing Service Area and Land Use Plans
The City of Sebastopol is a semi-urban incorporated community located in western Sonoma County, approximately 50 miles north of San Francisco and 7 miles west of Santa Rosa. The area is bounded by the Laguna De Santa Rosa to the west and Atascadero Creek to the east. Highway 12 and Bodega Avenue are the main transportation corridors and bisect the community into north-south quadrants. Highway 116 bisects the community into east-west quadrants.

Appendix A shows the City’s land-use map as provided in the General Plan. The commercial areas are generally located along the Highway 116 corridor, with the majority of commercial and industrial space in the northeast quadrant of the City. The remaining areas are primarily residential with a scattering of parks and institutional land use for schools.

The City owns, operates, and maintains the SMWS under permit from the State of California, Water Resources Control Board, Division of Drinking Water (DDW). The City’s sole source of drinking water comes from four (4) wells that distribute water to two (2) pressure zones. A fifth well remains offline at this time due to detected amounts of soil contamination from perchloroethylene (PCE).

2.1.1 Land Use Plans
Land use planning for the service area is performed under the auspices of the City’s Planning Commission, Planning Department, the Design Review Board, citizen committees, and the Sonoma County Local Agency Formation Commission (LAFCO), as detailed in the General Plan.

The officially recognized General Plan was adopted in 1994 with updates in 1995, 1996, 1998, 2003, and 2016. The Housing Element, which is a required component of the General Plan, was separately updated, and adopted on January 3, 2023 to comply with California’s Sixth Cycle housing requirements. Consistent with the goals outlined in the General Plan, the City has adopted measures to limit urban sprawl by reducing the City’s Sphere of Influence (SOI) and by encouraging infill, a means of concentrating new development within the City limits. The community, in agreement with these ideals, adopted the Urban Growth Boundary (UGB) Measure (Measure O) in 1996, which extended the UGB through December 31, 2040. In essence, Measure O prohibits additions to the SOI by the City Council for a period of 20 years unless they are endorsed by voters’ approval.

In keeping with the General Plan, the City adopted a Growth Management Ordinance (GMO) which established maximum allowable growth rates based on the community’s ability to provide key resources (water, wastewater, roads, and schools, for example). This ordinance, which limited the number of new residential units to 50 per year and total residential allocations to 750 residential units through 2035, was rendered invalid as of January 1, 2020 with the passage of Senate Bill (SB) 330, the Housing Crisis Act.

The General Plan November 15, 2016, also establishes level of service (LOS) standards for all utilities including the water system. Each year since 2016 the City publishes an LOS report that includes annual statistics for water usage and outlines studies and improvements to the system. However, there has not been an annual LOS Report published for the last few years because the requirement for the annual LOS Report was contained within the GMO, and since the GMO was rendered invalid, so too was the requirement for an Annual LOS Report.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 5

2.2 Zoning and General Plan’s Land Use Designation
As mentioned in the previous section, the City of Sebastopol General Plan establishes land use designations for all areas within the SOI. These designations establish the City’s zoning regulations as described in the Zoning Ordinance and as illustrated in the Land Use Designations Map. The map in Appendix A reflects current zoning within the City’s SOI, in accordance with the 2016 General Plan. The eleven (11) land use zones identified on this map include Open Space, Parks, Community Facilities, Very Low Density Residential, Medium Density Residential, High Density Residential, General Commercial, Office, Downtown Core, Light Industrial, and Office/Light Industrial.

2.3 Existing Water System
To map a course for future improvements to the City’s water system, it is vital to evaluate the development and level of service of the existing system, identify existing deficiencies, and develop alternatives to remedy them. Refer to Figure 2 for the map of the City’s existing water system Agenda Item Number 11 Agenda Item Number 11
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 6 Figure 2 Existing Water System
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 7

2.3.1 Historical Development
The City’s first water came from Calder Creek, a tributary that traverses diagonally from the southwest corner of the City through Ives Park. Water was pumped to a reservoir that at one time resided on Parquet Hill, and it was distributed through the City water system. Over time, new reservoirs were built: Pleasant Hill Reservoir 1 (1979, 3 million gallons), Pleasant Hill Reservoir 2 (1986, 3 million gallons), and First Street Reservoir (1994, 1.5 million gallons). The Pleasant Hill reservoirs serve higher-elevation areas, while the First Street Reservoir serves lowerelevation areas.

Wells #4 (1953) and 7 (1996) supply water to Pressure Zone 1 with the average annual production of 157 million gallons (MG) and 89.5 MG, respectively. Wells #6 (1968) and #8 (2007) supply water to Pressure Zone 2 with the average annual production of 26.5 MG and 44.5 MG. Well #3 was drilled around 1950 yet succumbed to settlement shortly after commission. Well #5 was drilled in 1960 but is shut down because of groundwater contamination.

Table 2 summarizes the information of the reservoirs and wells in the City.

Table 2 Summary of Reservoirs and Wells in the City.

Asset
Type
Asset Name Location Year of
Construction
Current Status Storage Capacity (for
Reservoir)/
Average Annual
Production (for Wells)
Reservoir Pleasant Hill
Reservoir 1
1281 Pleasant
Hill Road
1979 In service 3 million gallons (MG)
Pleasant Hill
Reservoir 2
1281 Pleasant
Hill Road
1986 In service 3 MG
First Street
Reservoir
976 Mackey
Court
1994 In service 1.5 MG
Well Well #3 Unknown 1950s Removed N/A
Well #4 710 Petaluma
Avenue
1953 In service 150 MG
Well #5 6848 Fannen
Avenue
1960 Not in service due to
groundwater contamination
N/A
Well #6 991 Gravenstein
Highway
1968 In service 19 MG
Well #7 1157 Village Way 1996 In service 83 MG
Well #8 351 Jewell
Avenue
2007 In service 59 MG
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 8

2.3.2 Existing Water Demands
Based on metered sales by connection class, the annual average water billed for 2018 through 2024 is 290 MG, or 552 gallons per minute (GPM). This amount includes residential, commercial, industrial, irrigation, and other water uses, excluding water losses. The average per capita usage for the City including all users from 2018 to 2024 is 104 gallons per capita per day (GPCD). The average water usage for different user categories from 2018 to 2024 is presented in Table 3.

Table 3 Annual Average Water Demand Based on Sales Data for the Year 2018-2024 Parameter (Type of User) Parameter Value
Residential Annual Average Water Demand 193 MG
Commercial Annual Average Water Demand 65 MG
Irrigation Annual Average Water Demand 26 MG
Other Users Annual Average Water Demand 5 MG
Average per capita usage for the City including all users 104 GPCD Planning future water consumption based on current water use patterns requires making engineering assumptions.

These assumptions include evaluating calculated versus reported consumption, changing demographics, and conservation efforts.

To evaluate future water usage and required system upgrades, seasonal peaking factors and fire flow demands are applied to average water usage. Further discussion on these issues is discussed in Section 4.

2.3.3 Existing Water Sources
The City obtains all its drinking water from four (4) wells that pump groundwater from depths ranging from 580 to 1,015 feet below ground level. These wells are located approximately one-quarter mile west of the Laguna de Santa Rosa, a tributary of the Russian River. The principal recharge area for the City wells comes from the Wilson Grove Formation located in the hills west of the City, with additional recharge from the east. Figure 3 shows the map of the groundwater basins in Santa Rosa Plains area, including Wilson Grove Formation. Chlorine is added to the water at each well site to maintain protective disinfection residual levels in the distribution system and prevent microbial contamination.

A fifth well, Well #5, remains offline at present due to detected quantities of PCE exceeding the maximum standards established by the California Code of Regulations. Well data are outlined in Table 4.

The City’s water system supplies water to two (2) separate pressure zones (i.e., Pressure Zones 1 and 2), a description of which will be addressed in the next sub-section. Two (2) of the wells, Well #4 and Well #7, pump water to the First Street Reservoir, which supplies water to customers in Pressure Zone 1 by gravity. Wells #2 and #6 pump water to the Pleasant Hill Reservoirs, which supplies water to the distribution system of Pressure Zone 2 by gravity.

Figure 4 shows the location of the wells and the corresponding reservoirs they supply to.

The City’s only source of water is supplied by the four (4) functioning wells; thus, it is necessary to track groundwater levels over time. If water levels decline, it could indicate a decrease in aquifer supply.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 9 Figure 3 Santa Rosa Plain Groundwater Basins Map
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 10 Figure 4 Well and reservoir locations.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 11 Table 4 Well Data
Well
#
Pressure
Zone
Diameter
(inches)
Depth
(feet)
Well
Pump
Set
Depth
(feet)
Annual
Average
Production
(MG)
Annual
Average
Production
Rate (GPM)
Location Year of
Construction
4 1
14 775 250 150 286 710 Petaluma
Avenue 1953
7 8 710 440 83 159 1157 Village
Way 1996
8 2
14 580 400 59 112 351 Jewel
Avenue 2007
6 14 1,015 220 19 35
991
Gravenstein
Highway
1968
Based on water production data for 2018 to 2024, the annual average water production and production rate from the four (4) wells in the City are 311 MG and 592 GPM, respectively.

Figure 5 through Figure 8 shows the City’s rainfall data and the minimum and maximum depth of groundwater from the top of casing for Well #4, Well #6, Well #7, and Well #8. The groundwater level data is collected quarterly and/or annually by service providers including PES Environmental Inc. and NV5. The data is eventually provided by the City.

Please note that Figure 5 through Figure 8 do not show the groundwater level data in 2024 since it is provided as groundwater elevation (feet) msl, i.e., mean sea level, instead. The figures show that the groundwater level for all four (4) wells has been stable since 2018.

Figure 5 Well #4 levels.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 12 Figure 6 Well #7 levels.

Figure 7 Well #8 levels.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 13 Figure 8 Well #6 levels.

2.3.4 Raw Water Quality
The City’s municipal water supply faces notable water-quality challenges, primarily associated with arsenic and PCE contamination in several of its groundwater wells. The City’s wells (4, 6, 7, and 8) draw from the Wilson Grove Formation, a volcanic aquifer known to naturally release low levels of arsenic. Although this arsenic is geogenic, it remains a potential carcinogen. Consequently, the City of Sebastopol employs treatment and dilution strategies to ensure compliance with regulatory standards. These strategies include blending water from higher-arsenic wells with lower-arsenic sources and using ferric oxide treatment media with pH adjustment to reduce arsenic concentrations.

In addition to arsenic concerns, PCE, a volatile organic compound widely used in dry-cleaning operations, has been detected in Well #4. Based on the City’s Operational staff, some amount of arsenic is also detected in Wells #6 and #7. To address this issue, Well #4 is equipped with a granular activated carbon (GAC) filtration system, composed of coconut-shell based carbon, which effectively removes PCE prior to distribution. Because PCE is classified as a potential human carcinogen, its presence has necessitated both immediate remediation efforts and long-term infrastructure planning. Table 5 shows the water source issues and projects in the City, and their current status.

Regulatory requirements play a central role in the city’s response to these contaminants. Under California’s drinking water regulations, the maximum contaminant level (MCL) for arsenic is 10 parts per billion (ppb) or micrograms per liter (µg/L), consistent with the federal standard. Sebastopol’s monitoring data indicate that arsenic levels average approximately 4 µg/L, remain below this limit.

The City is also subject to statewide water source protection mandates. A Drinking Water Source Assessment conducted under California’s Source Water Protection Program identified Sebastopol’s wells as vulnerable to contamination from nearby dry-cleaning operations, gas stations, and older underground storage tanks. In accordance with the Porter-Cologne Water Quality Control Act, both the California State Water Resources Control Board and the North Coast Regional Water Quality Control Board oversee cleanup and monitoring activities, including remediation at the former dry-cleaning site at 580 Gravenstein Highway North. In 2021, the City and the responsible parties of the Agenda Item Number 11 Agenda Item Number 11
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 14 former dry-cleaning site entered into a settlement agreement for paying the City’s costs for treating the PCE at Well #4.

Overall, although Sebastopol’s drinking water currently meets applicable state and federal standards, the presence of arsenic and PCE combined with the City’s aging water infrastructure necessitates ongoing treatment, vigilant monitoring, and sustained capital investment to ensure continued protection of public health and long-term regulatory compliance.

Table 5 Water Source Issues and Studies
Project Contaminant(s) of Concern Course of Action Status Well #4 Treatment Facility PCE – Granular Activated Carbon (GAC), Disinfection
– Replacement of Well 4
A third-party hired by the City
is currently conducting the
replacement.

Well #6 Arsenic
Investigations
Arsenic in the form of As(V) – Arsenic testing and
remediation
– Lending and disinfection
– Blending with Zone 1 to
reduce contaminants
Ongoing
Well #7 Treatment Facility Arsenic in the form of As(III) – Packer Plug installed to seal off upper screens
– Carbon dioxide pH
adjustments
– Granular ferric oxide media
– Disinfection
Ongoing
Well #8 Treatment Facility None – Disinfection Ongoing
Groundwater Management /
Wellhead
– USGS groundwater
availability study
Ongoing

2.3.5 Existing Transmission and Distribution System
The City’s water distribution system network comprises over 38 miles (202,381 ft) of pipe, up to 24 inches in diameter.

Pipe materials include asbestos cement, ductile iron, cast iron, and polyvinyl chloride (PVC). The existing distribution facilities are shown on the Water System Map in Figure 2, and an inventory of the distribution system is tabulated in Table 6 and Table 7. Watermains are listed by material, size, and year constructed.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 15 Table 6 Pipe Lengths by Materials
Pipe
Material/
Length
(ft)
Pipe Diameter (inch) Total
Length
2 4 6 8 10 12 14 16 25 (ft)
Asbestos
Cement
339 3,207 23,635 13,288 3,673 11,353 958 56,454
Cast Iron 562 26 588
Concrete 2 432 435
Ductile
Iron
649 4,166 42,969 44,269 23,891 14,244 1,428 4,056 1,720 137,393 Polyvinyl
Chloride
(PVC)
1,634 1,187 539 3,360
Steel 36 806 842
Unknown 100 1,001 7 109 2,095 3,311
Total
length by
diameter
(feet)
1,088 7,375 70,269 59,557 28,238 27,692 1,428 5,014 1,720 202,381 Table 7 Pipe Lengths by Year
Year/
Length
(ft)
Pipe Diameter (inch) Total
Length
2 4 6 8 10 12 14 16 25 (ft)
Unkno
wn
100 1,554 73 105 3,709 93 5,634
1930 20 20
1965 2,359 2,359
1966 567 567
1967 127 1,764 1,678 3,727 432 7,728
1968 430 1,378 2,613 7,271 11,692
1969 493 493
1970 285 10,145 1,258 6,325 18,014
1971 14 277 291
1972 1,236 1,798 3,034
1973 254 334 39 1,431 2,058
1974 647 5,727 5,370 4,180 15,924
1975 729 4,688 3,004 4,012 12,433
1976 529 1,426 376 2,330
1977 85 3,715 1,443 5,243
1978 258 1,837 9,276 3,775 3,234 2,300 20,680
1979 100 3,503 1,930 125 3,726 4 3,100 1,627 14,115
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 16 Year/
Length
(ft)
Pipe Diameter (inch) Total
Length
2 4 6 8 10 12 14 16 25 (ft)
1980 1,025 294 1,320
1981 495 495
1982 778 1,069 1,455 971 4,272
1983 43 135 178
1984 199 3,406 1,230 4,835
1985 267 3,614 1,558 1,416 1,938 8,793
1986 1,311 4,339 1,299 490 2,572 10,010
1987 78 4,579 2,659 548 963 1,914 10,741
1988 1,843 1,887 3,730
1989 419 1,401 1,821
1990 46 37 1,715 7,764 1,081 1,698 12,340
1991 202 92 1,617 11 1,424 3,346
1992 181 4,826 5,007
1997 1,378 289 4 1,671
1998 54 988 1,042
1999 532 348 27 907
2001 233 688 921
2003 115 3,490 3,605
2007 690 690
2012 335 1,991 2,326
2017 463 463
2023 559 311 383 1,253
In 1968, the water network system was separated into two (2) pressure zones. Pressure Zone 1 customers are located in the eastern portion of the City and consist mostly of commercial users. Zone 2 customers reside at elevations exceeding approximately 130 ft above sea level.

The two (2) pressure zones are separated by three pressure regulating valves located at 1) Healdsburg Avenue, 2) Dutton and Huntley Avenue, and 3) Fircrest Avenue. These valves serve as inter-ties between the two zones.

Based on a field visit conducted by GHD with City staff, the pressure-reducing valves are not operational.

Three (3) storage reservoirs serve the City’s two (2) pressure zones. They serve to provide water storage for emergencies, to meet peak demand during maximum demand periods (usually July or August) and to maintain hydraulic stability. The total capacity of these tanks is 7.5 million gallons (MG). The details of the reservoirs are presented in Table 8.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 17 Table 8 Existing Reservoir Details
Name of Facility Number of Tanks Floor Elevation (ft) Pressure Zone Volume (MG) Total Volume (MG)
First Street
Reservoir 1 225 Zone 1-Low Zone 1.5 1.5
Pleasant Hill
Reservoirs 2 306 Zone 2-High Zone 3.0 6.0
The First Street reservoir, located on First Street, was constructed in 1991 and serves Pressure Zone 1, the lower elevation of the City. It is an epoxy-coated, welded steel tank, with a concrete slab-on-grade foundation and a capacity of 1.5 MG.

The Pleasant Hill reservoirs are located southwest of the City and were constructed in 1979 and 1986. They have a combined capacity of 6 MG. Like the First Street reservoir, these are also welded steel tanks. The older reservoir has a tar-coated interior; the newer reservoir is epoxy-coated.

The Pleasant Hill reservoirs supply the higher elevations of the City’s Zone 2 via gravity, whereas the low elevations of the City’s Pressure Zone 1 are supplied by the First Street Reservoir.

The water wells pump directly into the distribution system. When water production surpasses demand, the excess is directed into the reservoir for storage.

Based on field visits, the water well pumps are working based on the water level in the reservoirs. The set points of tank level that triggers the operation of wet well pumps are close implying that the tanks level do not draw much and the water is supplied to the distribution system mainly by the water well pumps. The water stored in the reservoirs is utilized for emergency conditions and to supplement during peak hour demands.

2.4 Santa Rosa Plain Groundwater Sustainability Agency
The Santa Rosa Plain Groundwater Sustainability Agency (GSA) is a public agency formed in 2017 under California’s Sustainable Groundwater Management Act (SGMA) to sustainably manage groundwater in the Santa Rosa Plain groundwater basin over a 20-year horizon. The agency has a Board of Directors, an Administrator, and an Advisory Committee.

The Wilson Grove Formation Highlands Basin, from which Sebastopol obtains its groundwater supply, lies entirely within the Santa Rosa Plain Subbasin. Sebastopol became a member agency of the GSA in 2019, signing the Joint Powers Agreement and assuming financial obligations for participation. Sebastopol’s groundwater planning is fully integrated with GSA’s GSP, ensuring compliance with SGMA. Sebastopol has representation on the GSA Board and Advisory Committee, influencing regional groundwater policy. Sebastopol also contributes to GSA funding through groundwater pumping fees. These fees support basin monitoring, data collection, and implementation of sustainability projects.

The GSA developed a Groundwater Sustainability Plan (GSP) for the Santa Rosa Plain Subbasin. The GSP was submitted to the California Department of Water Resources (DWR) in January 2022 and approved on January 26, 2023. The GSP sets measurable objectives to avoid undesirable results such as chronic lowering of groundwater levels, seawater intrusion, degraded water quality, and land subsidence. The GSP establishes a standard for sustainability of groundwater management and use and determines how the basin will achieve this standard by 2042.

The GSP sets measurable objectives and minimum thresholds for six sustainability indicators:
– Groundwater Levels:
• Avoid chronic lowering of water tables.
• Minimum thresholds based on historical low levels and protective depths for municipal wells. – Groundwater Storage:
• Maintain sufficient storage to meet long-term demands and drought resilience.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 18 – Water Quality:
• Prevent degradation of drinking water quality (e.g., arsenic, nitrates, TDS). – Land Subsidence:
• No significant subsidence that damages infrastructure. – Seawater Intrusion:
• Not applicable for Sebastopol (inland basin).
– Surface Water Depletion:
• Protect interconnected streams and ecosystems from excessive pumping.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 19

3. Development of the Water System Model
A Bentley WaterGEMS water system hydraulic model was created utilizing the City’s water GIS data. All the layers from the GIS were imported to develop the base model. The connectivity of the base model was verified against the GIS layers and the hydraulic model previously developed as part of the original 2005 Water Master Plan. The following details the development of the water model used for this study:
– Model junctions were placed at the intersections of pipelines. These are imaginary points in a computer model where pipes connect with each other, where water is used and where pressures are calculated. – Pressure-regulating valves at pressure zone intersections were added to isolate the two zones as in the real system.
– Nodes were assigned with elevations obtained from the DTM in the Sonoma Countywide Lidar Products and applying a cover of 4.9 ft.
– Pipes were assigned the following attributes:
• Diameter
• Length
• Year installed
• Material type
• Hazen-Williams C-factor
– Supply was modelled as:
• Water wells were modelled as reservoirs with no pumps in the absence of pump data • Reservoirs were modelled as tanks with water level obtained from field data. – Water demand in the model was assigned uniformly across nodes based on water production data to account for losses and non-revenue water in the system.

It is important to note that pressures and flows modeled for master plan purposes are not appropriate for direct use in development or construction projects. Each project should be evaluated on a case-by-case basis using good engineering judgment and sound engineering principles.

3.1 Assumptions and Limitations
The following assumptions were made when developing the water network model. – The elevation of the junctions, base elevation of reservoirs was obtained from topographic data. A cover of 4.9 ft was applied to all the junctions in the model.
– The elevation of hydrants was modelled at 1.6 ft above the ground surface. – In the absence of wet well pump details, such as pump curves or pump models, and of data on wet well water levels, the wet wells were modelled as reservoirs without pumps. In the future, it is recommended that the pumps be included in the model to reflect the actual working conditions of the pumps in the field. – In the absence of SCADA data for the tanks, the minimum and maximum water levels were based on details obtained from a field visit. The operating level of water was adjusted to match field observed pressure in the system.
– In the absence of demand data, the demand in the model was uniformly applied across all the nodes. The demand was calculated based on water production data obtained from the City for the years 2018 to 2024.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 20

3.2 Steady-state Calibration
The hydraulic model was calibrated using hydrant flow test results collected in the field on July 14, 2025. A total of twenty (20) hydrant flow tests were performed (see Appendix B for their locations). In addition, three (3) previous hydrant flow tests completed in 2024 were incorporated to verify the southern portion of the network, as no recent hydrant testing had been conducted in that area.

The calibration results and corresponding deviations between the model results and field measurements are provided in Table 9. Figure 9 shows the location of the hydrants used for calibration. Comparison of the model results against field data indicates that the deviation in static pressure between modelled and measured values generally falls within ±5 psi at all locations, except for one hydrant, where the model closely reflects the observed field conditions.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 21 Figure 9 Locations of hydrants for calibration.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 22 Model calibration was achieved by adjusting pipe friction factors (C-factors) based on pipe material and age.

Verification also indicated that the PRV located on Fircrest Avenue would be operational with a set pressure of approximately 56 psi. This PRV adjustment was incorporated into the model to match field-observed pressures.

Without applying this PRV setting, the model predicted static pressures exceeding 100 psi during hydrant tests, which did not align with field observations.

Table 9 Modelled Pressure to Field Static Pressure Comparison Hydrant Test # Label Modelled Pressure
(psi)
Field Static Pressure
(psi)
Deviation
(Field Pressure -
Modelled Pressure)
(psi)
Parquet St H-159 60 56 -4
Dowd Drive H-389 65 60 -5
HT-01 H-249 81 83 2
HT-02 H-24 52 54 2
HT-03 H-18 61 64 3
HT-04 H-43 86 86 0
HT-05 H-63 60 59 -1
HT-06 H-60 56 56 0
HT-07 H-52 67 66 -1
HT-08 H-111 69 68 -1
HT-09 H-69 69 75 6
HT-10 H-66 73 74 1
HT-11 H-174 73 72 -1
HT-12 H-182 75 72 -3
HT-13 H-241 59 57 -2
HT-14 H-233 63 61 -2
HT-15 H-224 65 61 -4
HT-16 H-222 65 67 2
HT-17 H-218 66 69 3
HT-18 H-195 53 50 -3
HT-19 H-380 26 26 0
HT-20 H-366 68 69 1
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 23

4. Water Demand Projections
This section discusses existing and projected water demands used in the water system model analysis to evaluate reservoir capacities, source supply, and fire flow capacity. Maximum month, day, and hour peaking factors based on historical water production and use statistics provided by the City are also discussed.

4.1 Water Demand Conditions
Demand criteria were developed for the following events:
– Average Daily Demands
– Maximum Hourly Demands as a percentage of Average Hourly Demands (existing and future) – Maximum Daily Demands as a percentage of Average Daily Demands (existing and future)

4.2 Average Demands – Existing Conditions
Statistics provided by the City regarding water production and usage during 2018 to 2024 show that the annual water production by the City has averaged 311 MG. These same statistics show that over the same period of time, total annual production data exceeds total annual reported use (billed) by an average of 6%, or 21 MG. This non-revenue water (water loss) of 21 MG can be attributed to poorly functioning or inaccurate water meters, unmetered services, theft, and distribution system leaks.

To account for the losses within the distribution system, the average day demand (ADD) in the system was calculated based on the annual water production of 311 MG. This is done by converting the annual water production of 311 MG into an average daily rate of 592 GPM. Since the water demands differentiating each user type was not available, the 592 GPM ADD in the system is equally distributed among all 796 model junctions, which are imaginary points in a computer model where pipes connect with each other, where water is used and where pressures are calculated. As a result, the ADD for each junction is 0.74 GPM, and it is used for the purpose of this water system modelling. Table 10 shows the breakdown of the total water production and the ADD value used for the modelling.

Table 10 Breakdown of the total water production and the ADD value used for the modelling.

Total Water
Production,
Annual Average
(MG)
ADD (GPM) Number of Model
Junctions
ADD Per Model Junction
(GPM)
Total Non-Revenue
Water, Annual
Average (MG)
21 (6%) 311 592 796 0.74 1
Total Water Billed,
Annual Average
(MG)
290
Note:
1 Used as ADD per model junction for hydraulic modelling purpose.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 24

4.3 Peaking Factors
Water use varies by season, by certain days within the season, and by time of day. To account for these variations, peaking factors are commonly used to evaluate water system operating characteristics. Peaking factors are multipliers applied to average water usage, based on data accumulated from historical patterns.

The maximum day demand (MDD) peaking factor is used to analyze the water supply capacity of a distribution system and to design for water supply needs. It is expressed as the ratio of the highest daily water use rate during a year to the average daily demand (ADD). This data allows for storage capacity evaluations.

The maximum hour demand (MHD) is the highest hourly water use rate during the year. The MHD peaking factor is the ratio of MHD to ADD. MHD data is used for evaluating areas where service pressures fail to meet minimum requirements. MHD data is also used with fire flow demands for evaluating the capacity of the distribution system during fires. Table 11 lists peaking factors used in this study, which are from the previous master plan study as there were no historical data available to verify the peaking factors.

Table 11 Peaking Factors
Demand Type Peaking Factor
Maximum Day Peaking Factor 2.0
Maximum Hour Peaking Factor 5.0

4.4 Future 2045 Conditions Demands
Based on the United States’ Census Bureau, the estimated population in the City fluctuated in the past 25 years, from 8,032 in 2000 and 7,379 in 2010, to 7,521 in 2020. As per Table 12, the only period of population increase is during 2010-2015, which is 3%. To make the extrapolated population conservative, the 3% increase over 5-year period is used to calculate the population in 2025 and 2045. In 2025, the population is 7,729, whereas in 2045, the population will be 8,561. As a result, it represents a population increase of 11% over the span of a 20-year period, from 2025 (7,729 of population) to 2045 (8,561 of population). Figure 10 shows the City’s population from 2000 to 2045.

Table 12 Population of the City of Sebastopol from 2000 to 2020.

Year Population
2000 8,032 1
2010 7,379 1
2015 7,583 1
2020 7,521 1
Note:
1 Based on the population data in the United States Census Bureau.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 25 Figure 10 City's population from 2000 to 2045.

Since the aforementioned population increase is 11%, GHD used the same factor of 11% to calculate the projected demand. As a result, the projected ADD for each model junction in 2045 is 0.82 GPM. As stated in Section 3, model junctions are imaginary points in a computer model where pipes connect with each other, where water is used and where pressures are calculated. The water demands used for each demand condition in the future scenario are summarized in Table 13.

Table 13 Demand Projected for Future Conditions for Normal Demand Conditions Demand condition Demand Per Model Junction Projected for 2045 (GPM) Average daily demand 0.82
Maximum daily demand 1.65
Peak hour demand 4.12
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 26

5. Results of Water System Analyses
This section describes the criteria used in the analyses of the hydraulic model to assess the performance of the system for existing and future conditions. This section details the results of the analyses based on the criteria and system deficiencies identified.

5.1 Evaluation Criteria
Criteria for evaluating supply, storage, and distribution systems are based on industry standards and are described in the following subsections.

5.1.1 Distribution System
Pipe capacity depends upon ranges of pressure, velocity, and flow specific to pipe types and sizes. Low service pressures experienced by customers usually indicate high service elevations relative to tank elevation within a pressure zone. Low service pressures can also result from bottlenecks, non-looped mains, and leaks within the system. High pressures during low demand conditions can usually occur in areas where customer service connections are located at low elevations. Customers with service connections that tie into water mains carrying high pressures are fitted with pressure-reducing valves to prevent the possibility of rupture.

The following is a list of pipe criteria used in this analysis, based on the National Fire Codes, the California Plumbing Code, municipal standards, and typical engineering practice:
– Desired Minimum Pressure at Peak Hour Demand: 40 psi
– Desired Minimum Pressure at Maximum Daily Demand plus Fire Flow: 20 psi – Desired Maximum Service Pressure: 100 psi

5.1.2 Fire Protection
One of the main services of the City’s water system is to provide fire protection. It is usually evaluated by analyzing the available fire flow in the City’s water system under maximum daily demand plus fire flow conditions, with a minimum residual pressure of 20 psi. According to the latest 2025 California Fire Code (CFC), the minimum flow for fire protection is 1,500 gallons per minute (GPM) of flow at residual pressure of 20 psi for 2 hours. Table 14 further details the minimum flows and durations of flows for fire protection, based on the 2025 CFC, which uses California Building Code construction types designation and area to determine the minimum flow requirements. The “Fire Area” is the aggregate floor area enclosed and bounded by fire walls, fire barriers, exterior walls, or horizontal assemblies (such as floors or ceilings) of a building. Sprinklered buildings are allowed up to a 75% reduction, but not less than 1,500 GPM.

Larger fire areas and more combustible construction types (e.g., Type V-B) require higher flows.

Since the minimum flow for fire protection is 1,500 GPM as per the 2025 CFC, it is used to analyze the available fire flow in the City’s water system. The required fire flow for the City is 1,500 GPM at a minimum residual pressure of 20 psi.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 27 Table 14 Minimum Flows for Fire Protection Requirements Fire Area (sq ft)
Minimum Flow
(GPM)#
Duration
(hrs) Type IA and IB* Type IIA and
IIIA*
Type IV and
V-A*
Type IIB and
IIIB* Type V-B*
0 – 22,700 0 – 12,700 0 – 8,200 0 – 5,900 0 – 3,600 1,500 2 22,701 – 70,900 12,701 –
39,700
8,201 –
25,500
5,901 –
18,400
3,601 –
11,300 1,750 – 2,750 2
70,901 – 83,700 39,701 –
47,100
25,501 –
30,100
18,401 –
21,800
11,301 –
13,400 3,000 3
83,701 – 128,700 47,101 –
82,100
30,101 –
46,400
21,801 –
33,500
13,401 –
20,600 3,250 – 3,750 3
128,701 – 145,900 71,401 –
82,100
46,401 –
52,500
33,501 –
37,900
20,601 –
23,300 4,000 4
145,901 – 225,200 82,101 –
126,700
52,501 –
81,100
37,901 –
58,600
23,301 –
36,000 4,250 – 5,000 4
225,201 – 295,900 126,701 –
166,500
81,201 –
106,500
58,601 –
77,000
36,001 –
47,400 5,250 – 5,750 4
295,901 and greater 166,501 and
greater
106,501 and
greater
77,001 and
greater
47,401 and
greater 6,000+ 4+
Notes:
*Types of Construction as per the 2022 California Building Code:
– Type I – Fire-resistive (non-combustible)
– Type II – Non-combustible construction
– Type III – Combustible and non-combustible mix
– Type IV – Mass timber
– Type V – Wood frame construction
#Measured at 20 psi residual pressure.

5.1.3 Water Storage Reservoirs
Water storage facilities for a municipal water supply system serve the following purposes:
– Reserve of treated water in the event of plant equipment or pump failure – Maintain minimum desired pressures
– Reserve for firefighting
– Reduce the necessity for large distribution mains
– Allow pumps to operate at average and not peak flow rates.

The total volume necessary to meet these requirements can be split into three separate components. The details of these components are summarized and explained in Table 15 and the subsections below. Figure 11 shows the water storage requirements for each zone.

5.1.3.1 Operational Storage
Operational storage is the volume difference required to maintain storage requirements when the supply source pumps are turned off. Operational storage is typically 100% of the average daily consumption. Average daily consumption in Sebastopol (2018-2024) totals 0.79 MG for the combined pressure zones. However, since the average Agenda Item Number 11 Agenda Item Number 11
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 28 daily consumption for each pressure zone is not available, the average daily water production for each pressure zone is used instead, which are 0.64 MG for Zone 1 and 0.21 MG for Zone 2.

5.1.3.2 Equalization Storage
Equalization storage is the volume sufficient to meet demands in excess of maximum daily demands. It is the storage required to meet water system demands that exceed the supply source’s pumping capacity. Typical equalization storage requirements are 25% of the maximum daily use.

5.1.3.3 Fire Storage
Fire storage is the volume of water required to meet fire flow demands and durations for each pressure zone that exceeds maximum daily demands. Fire storage volume is determined by multiplying fire flow rates by durations.

The recommended fire water storage based on the current California Fire Code is 540,000 gallons (3,000 GPM for 3 hours). This volume is based on the maximum size of a new un-sprinklered building with non-fire-rated construction, which is 7,500 ft2 for type V-B construction and 12,000 ft2 for type II-B/III-B construction.

Table 15 Water Storage Requirements
Pressure Zone
Classification
Operational Storage
(gallon)
Equalization Storage
(gallon) Fire Storage (gallon) Zone Total (gallon)
Zone 1 639,706 319,853 540,000 1,499,560
Zone 2 212,406 106,203 540,000 858,609
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 29 Figure 11 Water storage requirements for Zone 1 and Zone 2.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 30

5.2 Analyses of the Existing Water System
Hydraulic analyses of water system were performed using the model described in Section 4. Fire hydrant flow tests provided data necessary to calibrate the model by adjusting the pipe C-factors. Minor variations between field fire hydrant flow test and model fire hydrant flow test pressures are anticipated and result from variations between actual conditions and modelled conditions. Reservoirs were modelled as tanks with the minimum and maximum water levels set according to data obtained from field visits, and pressure zones were analyzed separately as PRV’s between the two zones normally remain closed. The following subsections describe the results of the analysis for the existing system.

5.2.1 Working Service Pressures during Peak Hour Demands As stated in the previous section, the pressure differential between the water supply and the customer connections must remain in a range between 40 psi to 100 psi, or 92.4 ft to 231 ft of pressure head. Pressures below this range are not sufficient for use.

According to model results, most of the City’s water distribution system falls within the acceptable range of 40-100 psi.

However, there are few locations identified near the Pleasant Hill Road, West Hill Circle, Golden Ridge Avenue, and Hayden Avenue where the pressure is below 40 psi. This is attributed to the higher elevation of these locations.

Figure 12 illustrates areas of the distribution system in both zones where service pressures fail to reach 40 psi.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 31 Figure 12 Modelled pressure under existing PHD condition.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 32

5.2.2 Fire Protection
Several aspects of the water system analysis are used to evaluate the adequacy of the existing fire protection capabilities. Proper pipe sizing, hydrant spacing, and residual pressures are all crucial components to achieving operational fire flows. The results of these analyses are described in this section.

Fire flows were modeled at each hydrant in the distribution system. These tests revealed hydrants with inadequate flows at a residual pressure of 20 psi. The hydrants that fall below the minimum fire flow requirement of 1,500 GPM during the MDD conditions are presented in Figure 13.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 33 Figure 13 Available fire flow at 20 psi under the existing MDD+FF condition.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 34

5.2.3 Reservoirs
As explained in Section 5.1.2, reservoirs must be capable of storing enough water to account for average daily consumption, demands in excess of pumping capacity, and firefighting. The volume required for each pressure zone is necessary to satisfy the evaluation criteria, and the actual reservoir capacities are listed in Table 16.

Table 16 Reservoir Capacities versus Storage Requirements Pressure Zones Total Storage Requirement (gallon) Reservoir Capacities (gallon) Zone 1 1,499,560 1,500,000
Zone 2 858,609 6,000,000
This data indicates that for existing land use and population densities, the reservoir capacities exceed the storage requirements for both pressure zones, which means that the City has more water storage than required. Since excessive storage can lead to stagnant water in the reservoir, it is advised to turn the water over in the reservoir every 2–4 days.

5.3 Analysis of the Water System for Future Conditions
Hydraulic analyses of the water system for the future 2045 conditions were performed using the model development described in Section 3.

5.3.1 Working Service Pressures
Figure 14 illustrates areas of the distribution system in both pressure zones for the future 2045 conditions during peak hour demand, where service pressures fail to reach 40 psi.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 35 Figure 14 Modelled pressure under future PHD condition.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 36

5.3.2 Fire Protection
Fire flows were modeled at each hydrant in the distribution system for the future 2045 conditions. Figure 15 highlights the location where the minimum flow requirement of 1,500 GPM cannot be met.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 37 Figure 15 Locations of hydrants above/below the required fire flow of 1,500 GPM, under the future MDD+FF condition.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 38

5.3.3 Reservoirs
The volume required for each pressure zone to satisfy the evaluation criteria for build-out conditions, and the actual reservoir capacities are listed in Table 17.

Table 17 Reservoir Capacities versus Future Storage Requirements Pressure Zones Total Storage Requirement
(gallon)
Reservoir Capacities
(gallon)
Additional Required
Storage (gallon)
Zone 1 1,602,817 1,500,000 102,817
Zone 2 892,895 6,000,000 0
This data indicates that for build-out land use and population, the Zone 1’s water storage requirement in 2045 exceeds the reservoir capacity by 7%. The total storage in the City is sufficient for the City as a whole and there are connections in place that allow water to flow from Pressure Zone 2 to Pressure Zone 1, which will help compensate the storage deficit in Pressure Zone 1.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 39

6. Recommended Water System Improvements
The hydraulic analyses of the Sebastopol’s water system presented in Section 5 revealed various deficiencies in the system including location where the minimum pressure requirement is not met. GHD also identified some operational and maintenance practices for the distribution system. The following sections discuss a sequence of water system improvement recommendations based on the deficiencies found in the existing system.

6.1 Water System Recommended Improvements: Existing
Conditions
The analysis of City’s existing water system revealed some deficiencies in the distribution system when modeled with current densities during periods of high demand. Although storage capacities for both pressure zones are sufficient during these periods, some parts of the water system infrastructure are inadequate for providing pressures and flows required to meet current standards.

As indicated in Section 5.1.1, the desired minimum pressure at the service connection is 40 psi during peak hour demands. Section 5.2.1 shows areas in the existing system where service pressures failed to meet this standard.

Furthermore, Section 5.2.2 cited fire hydrants that failed to achieve required flows at residual pressures of 20 psi when modeled at flows during maximum day demands.

Upgrades can remedy many of the problems identified. However, there are a few areas of low pressure and low fire flow where upgrades to the existing system are not functionally practical. In some cases, service connections are physically located too high in elevation relative to the tanks to receive sufficient working pressures. In other cases, hydrants are located too close to a terminus in the system to draw proper flow. Upsizing the pipes in these areas is ineffective.

The following sections list the recommended improvements (Table 18) and best operation and maintenance practices (Table 19). Table 18 lists the recommended improvements ranked by priority from highest to lowest, where Project No. 1 has the highest priority and Project No. 14 has the lowest priority.

Table 18 presents the recommended improvements ranked by priority from highest to lowest, with Project No. 1 assigned the highest priority and Project No. 14 the lowest.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 40 Table 18 Recommended Improvements for the Water Distribution System Project No./
Priority
Ranking of
Importance
Project Name Start
Year
Description Rationale Expected Positive
Impact
Project
Cost 1
1 High Well 4
Replacement
2027 Replacement of the City's
municipal Well #4, which
has passed its lifespan
and is required to be
replaced.

Built in 1953, Well #4 has
passed its lifespan. Also, this
well supplies water to over
half of the City. Therefore,
due to its age and criticality
for the City’s reliable water
supply, the well needs to be
replaced.

Replacing Well #4 will
enhance the reliability
of the water supply.
$3,352,000
2 High Pleasant Hill
Loop
2027 Pleasant Hill Road water
system connection loop
from Pleasant Hill Tanks
at Lynch Road to the
intersection at Pleasant
Hill Road at Mitchell
Crescent.

This stretch of watermain is
critical as it connects the two
main storage tanks that
supplies water to Zone 2
area. Due to its length and
strategic location, any failure
or disruption along this
section poses a significant
risk to the service area’s
overall water security. A
break, leak, or shutdown
could compromise supply
continuity, reduce system
pressure, and potentially
affect many consumers.

Building this watermain
can provide a second
route for water to
supply the Zone 2 area,
which makes the water
supply more reliable
and reduces the risks
of pressure drop and
service shutdown even
if there is a failure in
one of the routes.
$952,780
3 High Structural
Assessment of
Existing Water
Tanks
2027 Study of structural
assessment of First Street
Tank and Pleasant Hill
Tanks
Based on site visit, it was
found that the tanks do not
have anchorage to the
foundation, which is not as
per the standards. The
operation level of the tank is
lower than the design liquid
level suggested in the plate
for respective tanks hence it
is needed to determine the
actual structural condition of
the tank beyond visual
inspection. Required now
because previous reports
(Aqua Video Engineering,
2022) were only visual and do
not meet U.S. standards for
structural diagnosis.

This CIP improves
safety and compliance,
supports seismic
retrofit design, and
facilitate tanks to be
able to hold water up to
their intended capacity.
$126,000
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 41 Project No./
Priority
Ranking of
Importance
Project Name Start
Year
Description Rationale Expected Positive
Impact
Project
Cost 1
4 High Seismic Retrofit
Design for
Existing Water
Tanks
2027 Design for seismic retrofit
and construction project
for First Street Tank and
Pleasant Hill Tanks
Required to upgrade the tank
to meet current seismic codes
and ensure resilience during
earthquakes.

Compliance with ASCE
41 and AISC 342-22,
reduced risk of failure,
extended service life.
$141,750
5 High Gwendolyn
Place Water
Service
Connection
Replacement
2027 Replace approximately 9
existing service
connections with ¾-inch
diameter HDPE service
lateral pipes along
Gwendolyn place from the
intersection of Litchfield
Avenue.

According to the City
operation staff, this location
has had multiple repairs
(couple replacements) in the
past.

Replacing the water
service laterals with
HDPE will help reduce
the risks of pipe breaks
and service disruption.
$73,240
6 High Installation of
Automated
Flow Meter
2027 Installation of automated
flow meter for Yard tower
at Johnson Street- to
supply potable water to
local customers
The installation of automatic
flow meters at the yard tower
is essential to accurately
measure, monitor, and
manage water supplied for
construction activities and
customer use during the dry
season. Currently, there is no
automated flow meter
installed. The absence of flow
measurement limits the ability
to track water distribution,
assess consumption, and
ensure accountable usage.

With the installation of
automatic flow meters,
the City will enable
real-time monitoring
and accurate billing of
the water. Further, the
flowmeter will provide
improved operational
control, and support
data-driven decisionmaking for resource
allocation.
$74,430
7 High 500 South Main
Street
Watermain
Replacement
2027 Replace approximately
215 feet, 8-inch watermain
along 500 South Main
Street from the
intersection of Gravenstein
Highway South to the
south of Walker Avenue
This replacement is
suggested by the city’s
operation staff due to past
maintenance works.

Replacing this with new pipe
will provide enhanced
hydraulic efficiency and
system performance and also
prevents any leakage losses
that may have happened
during maintenance works.

The watermain
replacement will
enhance water
pressure and fire
protection for
customers in the area.

Also, it will improve the
efficiency of the system
for water conveyance.
$152,460
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 42 Project No./
Priority
Ranking of
Importance
Project Name Start
Year
Description Rationale Expected Positive
Impact
Project
Cost 1
8 High Replacement of
Existing
Pressure
Reducing
Valves
2027 Replacing the existing
pressure reducing valves
at Healdsburg Avenue,
Fircrest Avenue, and at
Dutton and Huntley
Avenue
Currently the pressure
reducing valves present in the
network system is not
working. Site visit shows that
the existing PRV’s do not
have set pressure, which the
pressure zones might not be
separated properly. Improper
separation could cause over
pressure in downstream
pressure, leading to leaks or
pipe bursts.

By replacing the
pressure reducing
valve (PRV), proper
separation of pressure
zones within the water
system can be
achieved. When
functioning correctly,
PRVs maintain
appropriate
downstream pressures,
thereby preventing
excessive pressure that
could result in leaks or
pipe bursts.
$256,830
9 Medium Well 6 Water
Treatment
System
2030 Addition of an arsenic
treatment system to the
City’s municipal Well #6.

There has been a concern
about the naturally occurring
arsenic in water produced
from Well #6, and the City
has been using dilution to
maintain arsenic level in the
water below the maximum
contaminant level of 10 ppb.

Adding the treatment system
can remove arsenic from the
water produced from Well #6.

With the treatment
system, the arsenic in
the water at Well #6
can be removed,
ensuring public health.
$3,635,700
10 Medium Valley View
Drive Water
Service
Connection
Replacement
2030 Replace approximately 94
water service laterals
using approximately 20
feet, ¾-inch diameter
HDPE service lateral
pipes, along Valley View
Drive from the intersection
of Ragel Avenue.

This location has had many
pipe breaks due to corrosive
soil and the City has
performed multiple repair
services in the past.

Replacing the water
service laterals with
HDPE will help reduce
the risks of pipe breaks
and service disruption.
$682,870
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 43 Project No./
Priority
Ranking of
Importance
Project Name Start
Year
Description Rationale Expected Positive
Impact
Project
Cost 1
11 Medium Covert Lane CI
Watermain
Replacement
2030 Replace approximately
360 feet 6-inch cast iron
water line on Covert Lane
between Norlee Street and
Zimpher Drive
This is a 40-year-old CI pipe
and would therefore have
severe corrosion, resulting in
reduced flow.

The watermain
replacement will
enhance water
pressure and fire
protection for
customers along
Covert Lane between
Norlee Street and
Zimpher Drive.

This CIP will improve
the system’s water
conveyance efficiency.
$237,190
12 Medium Ellis Court CI
Watermain
Replacement
2030 Replace approximately
195 feet 6-inch diameter
old cast iron pipe between
Ellis Court and High
School Road
The old CI pipe would have
been severed corroded,
resulting in reduced flow.

The watermain
replacement will
enhance water
pressure and fire
protection for
customers between
Ellis Court and High
School Road.

Also, it will improve the
general system
efficiency.
$141,550
13 Low Installation of
Isolation Valves
2032 Installation of isolation
valves at different location
for system isolation during
repair works at Parquet St
and Litchfield Avenue
Isolation valves enable
pressure zoning and sectional
operations. Absence of (or
insufficient) isolation valves
would lead to wider system
shutdown during repair
works.

Installation of isolation
valves allows sections
of the water system to
be shut off while
keeping the rest in
operation. Avoids
complete system
shutdown and
minimizes downtime
and water loss.
$154,930
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 44 Project No./
Priority
Ranking of
Importance
Project Name Start
Year
Description Rationale Expected Positive
Impact
Project
Cost 1
14 Low Painting and
Relining of
Existing Water
Tanks
2032 Painting and relining of
First Street Tank and
Pleasant Hill Tanks
Recent inspections in 2022
by Aqua Video Engineering
reported that blisters and
cracks on sidewalls and floor
coatings, as well as rust
stains on the ceilings were
observed in the tanks, with
signs of corrosion and
calcium chloride seepage.

Damaged coating/exposed
metal surface and cracks on
the tanks could cause
corrosion, metal deterioration
and shorten service life of the
assets
Repainting and relining
steel storage tanks
prevent corrosion,
preserves structural
integrity, and supports
water quality
standards. Protective
coatings extend asset
life and lower
maintenance costs.
$827,490
1 Included soft cost and construction cost without inflation or 4% annual escalation.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 45

6.2 Best Operation and Maintenance Practices
Table 19 presents the best management and operational practices that can be implemented in the water distribution system.

Table 19 Best Operation and Maintenance Practices
No. Description Justification and Benefits Estimated Effort Estimated Cost 1 Flushing of deadend pipes at
Huntley, Swartz
Avenue, Neva St,
Batley Ct, Valley
View Drive,
Gravenstein Hwy N,
Teresa Ct, Ellis Ct
– Flushing of water distribution pipes at dead
ends is recommended to maintain water
quality and system reliability. Dead-end
sections often experience low or stagnant
flow conditions, allowing sediment, biofilm,
and residual disinfectant depletion to occur
over time. This can lead to water
discoloration, taste and odor issues, and
potential bacterial growth, compromising
compliance with drinking water standards.

Regular flushing removes accumulated
debris and ensures the distribution system
maintains adequate water quality and
hydraulic performance.
– 30 minutes for two
maintenance staff at
least once per
quarter (3 months)
for dead end flushing
from hydrant or blowoff.
– $1,000
– Including labor,
assuming 2
City’s operators
for a day at
$50/hour. This
cost also
includes mileage.
2 Hydraulic issues
associated with fire
hydrants located on
dead-end water
mains. Several
sites—including
Hermosa Court,
Ellis Court,
McKinley Street,
Abbot Avenue,
Hutchins Avenue,
North Main Street
(dead end), and
Gravenstein
Highway North
(dead end). City
confirmed vibration
and pressure
problems caused by
rapid hydrant
operation or
inadequate flow
control.
– These conditions can lead to pressure
surges, water hammer, and potential main
collapse, as well as ground vibrations
affecting nearby properties.
• Conduct flushing operations to remove
sediment and air pockets contributing to
hydraulic instability.
• Provide operator training on proper
hydrant opening and closing
procedures to prevent sudden pressure
changes.
– 30 minutes for two
maintenance staff at
least once per
quarter (3 months)
for dead end flushing
from hydrant or blowoff.
– $1,000 per
location
– Including labor,
assuming 2
City’s operators
for a day at
$50/hour. This
cost also
includes mileage.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 46 No. Description Justification and Benefits Estimated Effort Estimated Cost 3 Well pump
inspection
– Routine inspection of well pumps is essential
to ensure that the wells continue to operate
at their designed and permitted production
capacity. This helps identify issues such as
aging equipment, improper pump sizing,
mechanical wear, or operational
inefficiencies (e.g., incorrect pump settings or
motor problems) before they lead to reduced
performance.

Conducting thorough pump inspections
improves overall system reliability, reduces
stress on other water supply sources, and
minimizes operational costs associated with
longer pump run times or inefficient
operation.
– Remove and inspect
well pumps every 5
to 10 years or earlier
if performance
indicators, such as
loss of flow or
pressure, warrant.
– $25,000 per well
– This might be by
the City’s staff
with a third-party
vendor. The cost
includes
equipment and
machinery to
perform the
inspection, as
well as labor and
mileage.
4 Fixing or
maintenance of
SCADA system -
Pleasant Hill Tank
water level error
– Fixing the SCADA system for correctly
recording the water level at the Pleasant Hill
tanks. Perform a maintenance check.
– One time issue
resolution with
SCADA support
vendor
– $5,000 for a
single-day site
visit and
equipment repair.
– SCADA vendor
estimated
charges
5 Periodic drawdown
and refilling of the
tanks, rather than
maintaining full
capacity
continuously, can
improve water
quality by
minimizing water
age
– Currently, the well supplies both the system
demands and the storage tanks. However,
the tanks do not supply water back into the
system. As a result, the water in the tanks
remains stagnant, leading to high water age
and reduced water quality. Utilizing the tank
to supply the demand during peak electricity
hour will benefit in reducing the energy
consumption.
– No additional effort
expected with this
operational change.
– $0 – best
management
practice, which
would not require
additional labor
6 Regular water loss
audits
– The State of California requires urban water
suppliers to perform annual water loss audits
to identify and reduce water losses, which
could provide multiple benefits, including:
• Maintain the physical condition of the
water distribution system, since
performing water loss audits may
involve inspecting water assets (e.g.,
pipe leaks).
• Increase water supplies from water
losses. Particularly beneficial in the face
of drought and other water-shortage
issues.
• Lower the cost of water supply
operations to offset losses.
• Lower operating costs could keep the
water rate at a reasonable level.
– Two to three days of
staff time or
consultant time to
compare metered
water production
records with metered
water use records.
– The cost / effort to
perform leak
detection varies by
number of days. A
budgetary estimate is
$3,000 per day.
– $50,000 for
AWWA Water
Audit
– This will be done
by a third-party
vendor that will
bring their
equipment and
labor
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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 47 No. Description Justification and Benefits Estimated Effort Estimated Cost 7 Regular water asset
inspection
– Regular water asset inspections, such as
checking for pipe leaks, can help maintain
the physical condition of the water
distribution system and support water loss
audits.
– Undetermined – $0
– This is something
that the City
already does and
should continue
doing regularly to
inspect key water
assets in the
system. These
include, but not
limited to, three
PRVs, three
tanks, and four
wells with
treatment.
8 Valve turning
exercises
– The American Water Works Association
(AWWA) recommends that municipal valves
be inspected and operated regularly (at least
every three months). Valve exercises could
help confirm the current condition of the
valves, document valve operation, and
identify the need for valve repair.

Subsequently, the exercises could address:
• The water quality issue in the water
distribution system, if any.
• The water loss and supply reliability
issues.
• System isolation capability.
– Exercise all water
valves at least once
per year.
– $0
– This is something
that the City
should
incorporate as a
regular practice.

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GHD | City of Sebastopol | 12658893 | Water Master Plan Update 48 No. Description Justification and Benefits Estimated Effort Estimated Cost 9 Documentation and
maintenance of
records of water
assets and their
operations
– Currently, the records of the City’s water
assets and their operations are high level
and could be improved by including more
asset details and finer timesteps for the
operational data. Creating and maintaining a
detailed, up-to-date record of the City's water
assets and their operations enables accurate
hydraulic modelling of the City’s water
distribution system, supporting better
decision-making on capital projects. The
detailed record could include, but not be
limited to, the following:
• Wet well pump
– Pump model
– Pump curve
– Pump pressure and flow SCADA
data in finer timesteps, e.g., hourly
or by minute.
– Pump control setting
• Tank
– Maximum, minimum and
operational water levels
– Inflow and outflow SCADA data at
hourly or minute timesteps.
• Water meter
– Location of water meters
– Water consumption data by meter,
at hourly or by-minute timesteps.
– This is something
that the City should
incorporate as a
regular practice.
– SCADA vendor
estimated
charges of
$2,000 to train
the City’s staff
and enable the
SCADA system
to monitor or
record the data
at desired
frequencies.

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7. Estimated Cost for Recommended
Improvements
This section provides the estimated costs for the recommended improvement projects previously described to meet current and future system performance needs. Estimated costs were averaged from several project bids from recent years, adjusted for inflation. These were compared with other master plan figures adjusted for inflation. Future use of this cost data must be adjusted accordingly.

Each project estimate is based on the number of main connections into the pipe, the number of hydrants replaced, blow-offs, air release valves (ARV) and other appurtenances. Materials are selected based on the current City of Sebastopol Standard Details and Specifications. The standard cost for a pipeline includes the estimated costs for trenching, shoring, backfilling, paving, valves, and connections. Additional costs are added for mobilization, traffic control, and miscellaneous work. The estimate also includes the following prorated estimate mark-ups and escalation:
– Estimating Planning Contingency at 15%: An allowance based on 15% of the construction costs estimate subtotal has been included for Estimating Contingency. This allowance is used during design to provide for a contingency to items of work that may not be included and price variations in the estimate as the design is developing.
– Estimated Construction Contingency at 10%: An allowance based on 10% of the construction costs estimate subtotal including estimating contingency has been included for Construction Contingency. This allowance is intended to provide for a construction contingency to cover change orders during construction. – Escalation at 4% annually: An allowance of 4% annually for construction materials, equipment & labor cost escalation, and inflation up to the anticipated mid-point of construction is included in the various construction cost estimate items. No allowance has been made for code escalation or technological escalation. Escalation is added to the Construction Subtotal.
– City Project Management at 5%: An allowance of 5% of the soft costs has been included in the total construction cost estimate for the City’s staff to manage the projects. – Engineering and Environmental at 12%: An allowance of 12% of the soft cost is included in the total construction cost estimate items for Contractor’s engineering and environmental work associated to the projects. – Construction Management and Inspection at 15%: An allowance of 15% of the soft costs is included in the total construction cost estimate items to cover the costs of construction management and inspection of the projects.

Since the detailed design and costing have been done for CIP 14, a different set of contingencies is used for that project. The project cost estimates do not include land acquisition or right-of-way costs.

For construction in California, GHD’s estimating experience shows the following general results on competitive bids, as a differential from pre-bid cost estimates:

Number of
Bids
Percentage
Differential
1 …….. +25 to 100%
2-3 …….. +10 to 25%
4-5 …….. 0 to +10%
6-7 …….. 0 to -10%
8 or more …….. -10 to -20%
The aforementioned cost estimates are provided at a planning level of accuracy and do not guarantee that a bid price will be received at or below estimates, as price bids are subject to numerous and changing variables. Accordingly, it is important to ensure that a minimum of 4 to 5 valid bids are received, if possible. Since neither the City of Sebastopol GHD | City of Sebastopol | 12658893 | Water Master Plan Update 49 Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

nor its consultants have any control over market conditions, there is no guarantee that bids will not vary significantly from the estimate, especially if there is not adequate competition among the available contractors.

7.1 Cost Estimates
The cost estimate of each recommended project is presented as follows:
– CIP 01: Well 4 Replacement
– CIP 02: Pleasant Hill Loop
– CIP 03: Structural Assessment of Existing Water Tanks – CIP 04: Seismic Retrofit Design for Existing Water Tanks – CIP 05: Gwendolyn Place Water Service Connection Replacement – CIP 06: Installation of Automated Flow Meter
– CIP 07: 500 South Main Street Watermain Replacement
– CIP 08: Replacement of Existing Pressure Reducing Valves – CIP 09: Well 6 Water Treatment System
– CIP 10: Valley View Drive Water Service Connection Replacement – CIP 11: Covert Lane CI Watermain Replacement
– CIP 12: Ellis Court CI Watermain Replacement
– CIP 13: Installation of Isolation Valves
– CIP 14: Painting and Relining of Existing Water Tanks GHD | City of Sebastopol | 12658893 | Water Master Plan Update 50 Agenda Item Number 11 Agenda Item Number 11
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Project Name
Project No CIP-05
Category Water Projects
Project Location Petaluma Avenue at Palm Avenue
Justification
Built in 1953, Well #4 as passed its lifespan. Also, this well supplies water to over half of the City. Therefore, due to its age and criticality for the City’s reliable water supply, the well needs to be replaced.

General Plan
Goals and policies
Community Services and Facilities CSF 1-5: Require development, infrastructure,
and long-term planning projects to be consistent with all applicable City infrastructure plans, including the Water Master
Plan, and the Capital Improvement Program.

ITEM 2026-27 2027-28 2028-292029-30 Project Total
1 Pre- construction (design, ROW, Environ) $ 440,000 440,000 $ 2 Construction $2,912,000 $ 2,912,000
Total
$ 3,352,000
Description
Replacement of the City's municipal Well #4 that has passed its lifespan and is required to be replaced.

Well 4 Replacement
Engineer's Opinion of Probable Construction Costs
GHD | City of Sebastopol | 12658893 | Water Master Plan Update 51 Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Project Name:

Project No CIP-01
Category Water Projects
Project Location Pleasant Hill Road
Justification
This stretch of watermain represents a critical component of the water distribution network, as it connects the two main storage tanks that supply the broader distribution system. Due to its length and location, any failure or
disruption along this section poses a significant risk to the overall water security of the service area. A break, leak, or shutdown could compromise the continuity of supply,
reduce system pressure, and potentially impact a large
number of consumers.

City has experienced some failures on Lynch Road in the past and the maintaince of it has caused 75% City water network without supply which highlights the improtance of water security issue in this location.

ITEM QUANTITY UNIT UNIT PRICE TOTAL
1 Water Pollution Control 1 LS 5,720.00 $ $ 5,720.00
2 Shoring and Trench Safety 1 LS 23,012.50 $ $ 23,012.50 3 Temporary Traffic Control 1 LS 10,800.00 $ $ 10,800.00 4 Utility Clearances 1 LS 6,000.00 $ $ 6,000.00
5 Utility Conflict Resolution 1 LS 10,610.00 $ $ 10,610.00 6 Addition of 16 inch PVC watermain 1,052 LF 350.00 $ 368,200.00 $ 7 Addition of valves and other miscellaneous 1 LS 92,050.00 $ 92,050.00 $ 8 Abandoning the watermains 1 LS 46,030.00 $ 46,030.00 $ 9 Landscape Restoration 1 LS 10,000.00 $ $ 10,000.00
10 Miscellaneous Work 1 LS 5,000.00 $ $ 5,000.00
CONSTRUCTION SUBTOTAL $ 577,430.00
Estimating Planning Contingency (15%) $ 86,620.00
Estimated Construction Contingency (10%) $ 57,750.00
CONSTRUCTION SUBTOTAL $ 721,800.00
Escalation (4% Annual) $ 28,872.00
CONSTRUCTION TOTAL $ 750,680.00

SOFT COSTS
City Project Management (5%) $ 36,090.00
Engineering and Environmental (12%) $ 86,620.00
Construction Management & Inspection (15%) $ 108,270.00 TOTAL SOFT COSTS $ 230,980.00
TOTAL CIP CONSTRUCTION ESTIMATE $ 952,780.00
Pleasant Hill Loop
Description
Pleasant Hill Road water system connection loop from
Pleasant Hill Tanks at Lynch Road to the intersection at Pleasant Hill road at Mitchell Cr.

Engineer's Opinion of Probable Construction Costs
Highlighted pipe is the proposed water loop conection which is not existing currently
GHD | City of Sebastopol | 12658893 | Water Master Plan Update 52 Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Project Name
Project No CIP-10
Category Water Projects
Project Location First Street and Pleasant Hill Tanks
Justification
Based on site visit it was found that the tanks do not have achorage to the soundation which is is not as per the
standards. The operation level of the tank is lower than the design liquid level suggsted in the plate for respective tanks hence it is needed to determine the actual
structural condition of the tank beyond visual inspection.

Required now because previous reports (2022) were only
visual and do not meet U.S. standards for structural
diagnosis. Benefits: ensures safety, compliance, and
informs seismic retrofit design.

ITEM QUANTITY UNIT UNIT PRICE TOTAL
1 Site Visit and Structural Assessment 3 EA 3,000.00 $ 9,000.00 $ 2 Geotechnical Investigation 3 EA 22,000.00 $ 66,000.00 $ 3 Structural Analysis and Reporting 3 EA 10,000.00 $ 30,000.00 $ 4 Miscellaneous 3 EA 5,000.00 $ 15,000.00 $
TOTAL 120,000.00 $
Escalation (4% Annual) $ 4,800.00
PROJECT TOTAL 124,800.00 $

SOFT COSTS
City Project Management (5%) $ 6,000.00
TOTAL SOFT COSTS $ 6,000.00
TOTAL CIP ESTIMATE $ 126,000.00
Structural Assessment of Existing Water Tanks
Description
Study of structural assessment of First Street Tank and Pleasant Hill Tanks.

Engineer's Opinion of Probable Project Costs
GHD | City of Sebastopol | 12658893 | Water Master Plan Update 53 Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Project Name
Project No CIP-11
Category Water Projects
Project Location First Street and Pleasant Hill Tanks
Justification
Based on site visit it was found that the tanks do not have anchorage to the foundation which is is not as per the
standards. Required to upgrade the tank to meet current seismic codes and ensure resilience during earthquakes.

Benefits: compliance with ASCE 41 and AISC 342-22,
reduced risk of failure, extended service life.

ITEM QUANTITY UNIT UNIT PRICE TOTAL
1 Site Visit 3EA $ 15,000.00 5,000.00 $
2 Calculations and seismic retrofit design 3EA $ 45,000.00 15,000.00 $ 3 Drawings 3EA $ 60,000.00 20,000.00 $
4 Miscellaneous 3EA $ 15,000.00 5,000.00 $
TOTAL $ 135,000.00
Escalation (4% Annual) $ 22,930.91
PROJECT TOTAL $ 157,930.91

SOFT COSTS
City Project Management (5%) $ 6,750.00
TOTAL SOFT COSTS $ 6,750.00
TOTAL CIP ESTIMATE $ 141,750.00
Description
Design for seismic retrofit and construction project for First Street Tank and Pleasant Hill Tanks.

Engineer's Opinion of Probable Project Costs
Seismic Retrofit Design for Existing Water Tanks
GHD | City of Sebastopol | 12658893 | Water Master Plan Update 54 Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Project Name
Project No CIP-06
Category Water Projects
Project Location Gwendolyn Place
Justification
According to City operation staff this location
has had multiple repairs (couple
replacements) in past. Replacing this with new
water service pipe will prevents any leakage
losses.

ITEM QUANTITY UNIT UNIT PRICE TOTAL
1 Water Pollution Control 1 LS 440.00 $ 440.00 $
2 Shoring and Trench Safety 1 LS $ 1,575.00 $ 1,575.00
3 Temporary Traffic Control 1 LS 1,700.00 $ 1,700.00 $
4 New 3/4-inch diameter HDPE service &
appurtenances (20 feet) 9 LS $ 3,500.00 $ 31,500.00
7 Abandon, Remove and Salvage Water
System Components 1 LS 900.00 $ 900.00 $
8 Landscape Restoration 1 LS $ 1,000.00 $ 1,000.00
9 Concrete Sidewalk Removal/Replacement 9EA $ 2,250.00 250.00 $ 10 Miscellaneous Work 1 LS $ 5,000.00 $ 5,000.00
CONSTRUCTION SUBTOTAL $ 44,370.00
Estimating Planned Contingency (15%) $ 6,660.00
Estimated Construction Contingency (10%) $ 4,440.00
CONSTRUCTION SUBTOTAL $ 55,470.00
Escalation (4% Annual) $ 2,218.80
CONSTRUCTION TOTAL $ 57,690.00

SOFT COSTS
City Project Management (5%) $ 2,780.00
Engineering and Environmental (12%) $ 6,660.00
Construction Management & Inspection (15%) $ 8,330.00
TOTAL SOFT COSTS $ 17,770.00
TOTAL CIP CONSTRUCTION ESTIMATE $ 73,240.00
Gwendolyn Place Water Service Connection Replacement
Description
Replace approximately 9 existing service
connection with 3/4 inch diameter HDPE along
Gwendolyn place from the intersection of
Litchfield Avenue.

Engineer's Opinion of Probable Construction Costs
GHD | City of Sebastopol | 12658893 | Water Master Plan Update 55 Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Project Name
Project No CIP-13
Category Water Projects
Project Location Johnson Street
Justification
The installation of automatic flow meters at the yard tower is essential to accurately measure, monitor, and manage water supplied for construction activities and customer use during the dry season.

Currently, the absence of flow measurement limits the ability to track water distribution, assess consumption, and accountable usage.

Automatic flow meters will enable real-time monitoring, improve operational control, and support data-driven decision-making for resource allocation.

ITEM QUANTITY UNIT UNIT PRICE TOTAL
1 Flow meter and instrumentation 1 LS 20,000.00 $ 20,000.00 $ 2 Piping modifications and mechanical work 1 LS $ 6,000.00 $ 6,000.00 3 Installation 1 LS $ 8,600.00 $ 8,600.00
4 Battery (electrical and instrumentation) 1 LS $ 4,000.00 $ 4,000.00 5 Addition of valves and other miscellaneous 1 LS 1,500.00 $ 1,500.00 $ 6 Miscellaneous Work 1 LS $ 5,000.00 $ 5,000.00
CONSTRUCTION SUBTOTAL $ 45,100.00
Estimating Planned Contingency (15%) $ 6,770.00
Estimated Construction Contingency (10%) $ 4,510.00
CONSTRUCTION SUBTOTAL $ 56,380.00
Escalation (4% Annual) $ 2,255.20
CONSTRUCTION TOTAL $ 58,640.00

SOFT COSTS
City Project Management (5%) $ 2,820.00
Engineering and Environmental (12%) $ 6,770.00
Construction Management & Inspection (15%) $ 8,460.00
TOTAL SOFT COSTS $ 18,050.00
TOTAL CIP CONSTRUCTION ESTIMATE $ 74,430.00
Installation of Automated Flow Meter
Description
Installation of automated flow meter for Yard tower at Johnson Street to supply potable water to local customers.

Engineer's Opinion of Probable Construction Costs
GHD | City of Sebastopol | 12658893 | Water Master Plan Update 56 Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Project Name
Project No CIP-07
Category Water Projects
Project Location 500 South Main Street
Justification
This replacement is suggested by the city's
operation staff due to past maintainence
works.Replacing this with new pipe will provide
enhanced hydraulic efficiency and system
performance and also prevents any leakage losses
that may have happend during maintaince works.

ITEM QUANTITY UNIT UNIT PRICE TOTAL
1 Water Pollution Control 1 LS 920.00 $ 920.00 $
2 Shoring and Trench Safety 1 LS $ 3,023.75 $ 3,023.75
3 Temporary Traffic Control 1 LS 3,300.00 $ 3,300.00 $
4 Utility Clearances 1 LS 6,000.00 $ 6,000.00 $
5 Utility Conflict Resolution 1 LS 6,640.00 $ 6,640.00 $ 6 8-inch PVC Water Main 215 LF $ 225.00 $ 48,375.00
7 Addition of valves and other miscellaneous 1 LS 12,100.00 $ 12,100.00 $ 8 Abandon, Remove and Salvage Water System
Components 1 LS 3,030.00 $ 3,030.00 $
9 Reconnect Existing Hydrant 1EA $ 2,000.00 2,000.00 $
10 Landscape Restoration 1 LS $ 2,000.00 $ 2,000.00
11 Miscellaneous Work 1 LS $ 5,000.00 $ 5,000.00
CONSTRUCTION SUBTOTAL $ 92,390.00
Estimating Planned Contingency (15%) $ 13,860.00
Estimated Construction Contingency (10%) $ 9,240.00
CONSTRUCTION SUBTOTAL $ 115,490.00
Escalation (4% Annual) $ 4,619.60
CONSTRUCTION TOTAL $ 120,110.00

SOFT COSTS
City Project Management (5%) $ 5,780.00
Engineering and Environmental (12%) $ 13,860.00
Construction Management & Inspection (15%) $ 17,330.00
TOTAL SOFT COSTS $ 36,970.00
TOTAL CIP CONSTRUCTION ESTIMATE $ 152,460.00
Description
Replace approximately 215 feet, 8 inch watermain
along 500 South Main Street from the intersection of
Gravenstein Highway South south of Walker
Avenue.

Engineer's Opinion of Probable Construction Costs
500 South Main Street Watermain Replacement
GHD | City of Sebastopol | 12658893 | Water Master Plan Update 57 Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Project Name
Project No CIP-08
Category Water Projects
Project Location
Healdsburg Avenue, Fircrest Avenue and at Dutton and
Huntley Avenue
Justification
Currently the pressure reducing valves present in the
network system is not working. Site visit shows that the existing PRV's do not have set pressure. By replacing the PRV, the water system can be divided to pressure zones
and will be able to maintain steady downstream pressure which will prevent overpressurized sections leading to leaks or even pipe bursts.

ITEM QUANTITY UNIT UNIT PRICE TOTAL
1 Water Pollution Control 3EA $ 4,560.00 1,520.00 $
2 Shoring and Trench Safety 3EA $ 9,360.00 3,120.00 $
3 Temporary Traffic Control 3EA $ 10,800.00 3,600.00 $
4 Utility Clearances 3EA $ 18,000.00 6,000.00 $
5 Utility Conflict Resolution 3EA $ 20,160.00 6,720.00 $ 6 Addition of new PRV 3EA $ 16,000.00 $ 48,000.00
7 Addition of valves and other miscellaneous 3EA $ 14,400.00 4,800.00 $ 8 Abandon, Remove and Salvage Water System
Components 3 EA 3,120.00 $ 9,360.00 $
9 Landscape Restoration 3EA $ 6,000.00 2,000.00 $
10 Miscellaneous Work 3EA $ 15,000.00 5,000.00 $
CONSTRUCTION SUBTOTAL $ 155,640.00
Estimating Planned Contingency (15%) $ 23,350.00
Estimated Construction Contingency (10%) $ 15,570.00
CONSTRUCTION SUBTOTAL $ 194,560.00
Escalation (4% Annual) $ 7,782.40
CONSTRUCTION TOTAL $ 202,350.00

SOFT COSTS
City Project Management (5%) $ 9,730.00
Engineering and Environmental (12%) $ 23,350.00
Construction Management & Inspection (15%) $ 29,190.00
TOTAL SOFT COSTS $ 62,270.00
TOTAL CIP CONSTRUCTION ESTIMATE $ 256,830.00
Description
Replacing of the existing pressure reducing valves at
Healdsburg Avenue, Fircrest Avenue and at Dutton and
Huntley Avenue.

Engineer's Opinion of Probable Construction Costs
Replacement of Existing Pressure Reducing Valves
GHD | City of Sebastopol | 12658893 | Water Master Plan Update 58 Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Project Name
Project No CIP-14
Category Water Projects
Project Location 991 Gravenstein Hwy
Justification
There has been a concern about naturally
occurring arsenic at Well 6, and the City has been
using dilution to keep arsenic level in the water
below the maximum contaminant level of 10 ppb.

Adding the treatment system can further remove
arsenic from the water at Well 6.

ITEM QUANTITY UNIT UNIT PRICE TOTAL
1 Mobilization/Demobilization 1 LS 122,900.00 $ 122,900.00 $ 2 Demolition 1 LS 58,800.00 $ 58,800.00 $
3 Site Improvements 1 LS 78,300.00 $ 78,300.00 $
4 Treatment & Backwash System 1 LS 1,097,700.00 $ 1,097,700.00 $ 5 Site Utility Improvements 1 LS 177,000.00 $ 177,000.00 $ 6 Mechanical Piping 1 LS $ 157,600.00 $ 157,600.00
7 Well 6 Building Improvements 1 LS 195,800.00 $ 195,800.00 $ 8 Elec & Instrumentation 1 LS 117,900.00 $ 117,900.00 $ CONSTRUCTION SUBTOTAL 2,006,000.00 $
Contractor's Bonds, Insurance, Overhead, and Profit (20%) $ 401,200.00 Construction Contingency (15%) $ 361,080.00
Market Factor (3%) $ 72,216.00
CONSTRUCTION SUBTOTAL 2,841,000.00 $
Escalation (4% Annual) $ 482,568.17
CONSTRUCTION TOTAL 3,323,570.00 $

SOFT COSTS
Check & Update Design Before Bidding (3.5%) $84,300
City Project Management (5%) $142,100
Construction Engineering (5%) $142,100
Construction Management & Inspection (15%) $426,200
TOTAL SOFT COSTS $ 794,700.00
TOTAL CIP CONSTRUCTION ESTIMATE $ 3,635,700.00
Well 6 Water Treatment System
Addition of an arsenic treatment system at City's
municipal Well #6.

Engineer's Opinion of Probable Construction Costs
Description
GHD | City of Sebastopol | 12658893 | Water Master Plan Update 59 Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Project Name
Project No CIP-04
Category Water Projects
Project Location Valley View Drive
Justification
This location has had many lateral breaks due
to corrosive soils and city has performed
multiple repair services in the past. Replacing
this section with HDPE pipe will help reduce the
issues with the corrosive soil.

ITEM QUANTITY UNIT UNIT PRICE TOTAL
1 Water Pollution Control 1 LS 4,100.00 $ 4,100.00 $
2 Shoring and Trench Safety 1 LS $ 16,450.00 $ 16,450.00 3 Temporary Traffic Control 1 LS 17,300.00 $ 17,300.00 $ 4 New 3/4-inch diameter HDPE service &
appurtenances (20 feet) 94 EA 3,500.00 $ 329,000.00 $
6 Abandon, Remove and Salvage Water System
Components 1 LS 16,500.00 $ 16,500.00 $
8 Landscape Restoration 1 LS 2,000.00 $ 2,000.00 $
9 Concrete Sidewalk Removal/Replacement 94 EA $ 23,500.00 250.00 $ 10 Miscellaneous Work 1 LS 5,000.00 $ 5,000.00 $
CONSTRUCTION SUBTOTAL $ 413,850.00
Estimating Planned Contingency (15%) $ 62,080.00
Estimated Construction Contingency (10%) $ 41,390.00
CONSTRUCTION SUBTOTAL $ 517,320.00
Escalation (4% Annual) $ 87,871.23
CONSTRUCTION TOTAL $ 605,200.00

SOFT COSTS
City Project Management (5%) $ 25,870.00
Engineering and Environmental (12%) $ 62,080.00
Construction Management & Inspection (15%) $ 77,600.00
TOTAL SOFT COSTS $ 165,550.00
TOTAL CIP CONSTRUCTION ESTIMATE $ 682,870.00
Valley View Drive Water Service Connection Replacement
Description
Replace approximately 94 service connections
using approximately 20 feet ,3/4 inch diameter
HDPE pipe along Valley View Drive .

Engineer's Opinion of Probable Construction Costs
GHD | City of Sebastopol | 12658893 | Water Master Plan Update 60 Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Project Name
Project No CIP-02
Category Water Projects
Project Location Covert Lane
Justification
This is 40 year Old CI pipe and hence would have severe corrsoin resulting in reduced flow.

Replacing the Old CI pipe with HDPE will result in enhanced hydraulic efficency and system performance.

ITEM QUANTITY UNIT UNIT PRICE TOTAL
1 Water Pollution Control 1 LS 1,430.00 $ 1,430.00 $
2 Shoring and Trench Safety 1 LS $ 5,119.00 $ 5,119.00
3 Temporary Traffic Control 1 LS $ 5,600.00 $ 5,600.00
4 Utility Clearances 1 LS $ 6,000.00 $ 6,000.00
5 Utility Conflict Resolution 1 LS $ 7,080.00 $ 7,080.00 6 8-inch PVC Water Main 364 LF $ 225.00 $ 81,900.00
7 Addition of valves and other miscellaneous 1 LS 20,480.00 $ 20,480.00 $ 8 Abandon, Remove and Salvage Water System Components 1 LS 5,120.00 $ 5,120.00 $ 9 Reconnect Existing Hydrant 2EA $ 4,000.00 2,000.00 $
10 Landscape Restoration 1 LS $ 2,000.00 $ 2,000.00
11 Miscellaneous Work 1 LS $ 5,000.00 $ 5,000.00
CONSTRUCTION SUBTOTAL $ 143,730.00
Estimating Planning Contingency (15%) $ 21,560.00
Estimated Construction Contingency (10%) $ 14,380.00
CONSTRUCTION SUBTOTAL $ 179,670.00
Escalation (4% Annual) $ 30,518.49
CONSTRUCTION TOTAL 210,190.00 $

SOFT COSTS
City Project Management (5%) $ 8,990.00
Engineering and Environmental (12%) $ 21,570.00
Construction Management & Inspection (15%) $ 26,960.00
TOTAL SOFT COSTS $ 57,520.00
TOTAL CIP CONSTRUCTION ESTIMATE $ 237,190.00
Covert Lane CI Watermain Replacement
Replace approximately 360 feet 6 inch cast iron water line on Description Covert Lane between Norlee Street and Zimpher Drive.

Engineer's Opinion of Probable Construction Costs
GHD | City of Sebastopol | 12658893 | Water Master Plan Update 61 Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Project Name
Project No CIP-03
Category Water Projects
Project Location Between Ellis Court and High School Road Justification
This is an Old CI pipe and hence would have severe corrsoin resulting in reduced flow.

Replacing the Old CI pipe with HDPE will result in enhanced hydraulic efficency and system performance.

ITEM QUANTITY UNIT UNIT PRICE TOTAL
1 Water Pollution Control 1 LS $ 850.00 $ 850.00
2 Shoring and Trench Safety 1 LS $ 2,742.25 $ 2,742.25
3 Temporary Traffic Control 1 LS $ 3,000.00 $ 3,000.00
4 Utility Clearances 1 LS $ 6,000.00 $ 6,000.00
5 Utility Conflict Resolution 1 LS $ 6,580.00 $ 6,580.00 6 8-inch PVC Water Main 195 LF $ 225.00 $ 43,875.00
7 Addition of valves and other miscellaneous 1 LS 10,970.00 $ 10,970.00 $ 8 Abandon, Remove and Salvage Water System Components 1 LS 2,750.00 $ $ 2,750.00 9 Reconnect Existing Hydrant 1EA $ 2,000.00 $ 2,000.00
10 Landscape Restoration 1 LS $ 2,000.00 $ 2,000.00
11 Miscellaneous Work 1 LS $ 5,000.00 $ 5,000.00
CONSTRUCTION SUBTOTAL $ 85,770.00
Estimating Planning Contingency (15%) $ 12,870.00
Estimated Construction Contingency (10%) $ 8,580.00
CONSTRUCTION SUBTOTAL $ 107,220.00
Escalation (4% Annual) $ 18,212.23
CONSTRUCTION TOTAL $ 125,440.00

SOFT COSTS
City Project Management (5%) $ 5,370.00
Engineering and Environmental (12%) $ 12,870.00
Construction Management & Inspection (15%) $ 16,090.00
TOTAL SOFT COSTS $ 34,330.00
TOTAL CIP CONSTRUCTION ESTIMATE $ 141,550.00
Ellis Court CI Watermain Replacement
Description
Replace approximately 195 feet 6 inch diameter old cast iron pipe between Ellis Court and High School Road.

Engineer's Opinion of Probable Construction Costs
GHD | City of Sebastopol | 12658893 | Water Master Plan Update 62 Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Project Name
Project No CIP-12
Category Water Projects
Project Location Parquet Street and Litchfield Avenue
Justification
Isolation valves enables pressure zoning and sectional
operations. This allows sections of the water system to be shut off while keeping the rest in operation.Avoids
complete system shutdown and minimizes downtime and
water loss.

ITEM QUANTITY UNIT UNIT PRICE TOTAL
1 Water Pollution Control 2 EA 930.00 $ 1,860.00 $
2 Shoring and Trench Safety 2 EA $ 1,920.00 $ 3,840.00
3 Temporary Traffic Control 2 EA $ 2,000.00 $ 4,000.00
4 Utility Clearances 2 EA $ 6,000.00 $ 12,000.00
5 Utility Conflict Resolution 2 EA $ 6,390.00 $ 12,780.00 6 Addition of new PRV 2 EA $ 16,000.00 $ 32,000.00
7 Addition of valves and other miscellaneous 2 EA $ 3,200.00 $ 6,400.00 8 Landscape Restoration 3 EA $ 2,000.00 $ 6,000.00
9 Miscellaneous Work 3 EA $ 5,000.00 $ 15,000.00
CONSTRUCTION SUBTOTAL $ 93,880.00
Estimating Planned Contingency (15%) $ 14,090.00
Estimated Construction Contingency (10%) $ 9,390.00
CONSTRUCTION SUBTOTAL $ 117,360.00
Escalation (4% Annual) $ 31,137.84
CONSTRUCTION TOTAL 148,500.00 $

SOFT COSTS
City Project Management (5%) $ 5,870.00
Engineering and Environmental (12%) $ 14,090.00
Construction Management & Inspection (15%) $ 17,610.00
TOTAL SOFT COSTS $ 37,570.00
TOTAL CIP CONSTRUCTION ESTIMATE $ 154,930.00
Description
Installation of isolation valves at different location for system isolation during repair works at Parquet Street
and Litchfield Avenue.

Engineer's Opinion of Probable Construction Costs
Installation of Isolation Valves
GHD | City of Sebastopol | 12658893 | Water Master Plan Update 63 Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Project Name
Project No CIP-09
Category Water Projects
Project Location First Street and Pleasant Hill Tanks
Justification
Repainting and relining of the steel storage tanks
are essential to prevent corrosion, maintain
structural integrity, and ensure water quality
compliance. The protective coating system prevents
metal deterioration, extends the service life of the
assets, and reduces long-term maintenance costs.

Previous inspection was conducted in the year 2012
and hence it is recommended to perform an
inspection followed by painting and relining of the
tanks.

ITEM QUANTITY UNIT UNIT PRICE TOTAL
1 Inspection and cleaning of reservoirs 3EA $ 50,000.00 $ 150,000.00 2 Interior and exterior recoating of reservoirs 3EA $ 450,000.00 150,000.00 $ 3 Miscellaneous Work 3EA $ 15,000.00 5,000.00 $
SUBTOTAL 615,000.00 $
Estimating Planned Contingency (15%) $ 92,250.00
TOTAL 707,250.00 $
Escalation (4% Annual) $ 187,646.88
PROJECT TOTAL 894,900.00 $

SOFT COSTS
City Project Management (5%) $ 35,370.00
Engineering and Environmental (12%) $ 84,870.00
TOTAL SOFT COSTS $ 120,240.00
TOTAL CIP ESTIMATE $ 827,490.00
Description
Painting and relining of First Street Tank and
Pleasant Hill Tanks.

Engineer's Opinion of Probable Project Costs
Painting and Relining of Existing Water Tanks
GHD | City of Sebastopol | 12658893 | Water Master Plan Update 64 Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Appendix A
City of Sebastopol Land Use Map

Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Agenda Item Number 11
Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Agenda Item Number 11
Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Appendix B
Hydrant Flow Test Locations

Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

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242
234
233
226
225
222 223
219 218
196197
183 175 173
112
111
Sources: Esri, HERE, Garmin, USGS, Intermap, INCREMENT P, NRCan, Esri Japan, METI, Esri China (Hong Kong), Esri Korea, Esri (Thailand), NGCC, (c) OpenStreetMap contributors, and the GIS User Community
FIGURE B.1
0 180 360 540 720
Meters
Project No.

Revision No. -
12658893
Date 05/02/2025

CITY OF SEBASTOPOL
Map Projection: Mercator Auxiliary Sphere
Horizontal Datum: WGS 1984
Grid: WGS 1984 Web Mercator Auxiliary Sphere
Paper Size ANSI A
o

HYDRANT TEST LOCATIONS
Legend
Hydrant
!( Residual Hydrant
!( Flow Hydrant
#* Wells
Reservoirs
Watermains
Zone 1
Zone 2
Well 8
Pleasent Hill Tanks
First Street Tank
Well 4
Well 6
Well 7
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Appendix C
Hydrant Flow Test Results

Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

V..\\e1 /te*/ 'CF I

HYDRANT TEST INFORMATION RECORD
SINGLE HYDRANT FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. fPrefewed by Sebastopol FD; not NFPA.] TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANT FLOW: At Test Outlet gpm Project Available Hydrant Flow -
gpm 1
MANUFACTURER CoNNECTTONS 2% 4%

TEST DATE FLOW TIME GAL TESTED BY

1. Projected available flows from hydrant calculated at 20 psi residual FIRE MAIN FLOW TEST - NFPA 29L Stondord lest [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant. Two h)rdrants are required for this test per NPFA 291;the Test Hydrant f"residual" hydrant] and a Flow Hydrant, which upon opening, will aflect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time TEST HYDRANT # a5o LOCATION L.-
STATIC PRESSURE 93 psi RESIDUAL PRESSURE 1a psi
FLOW HYDRANT # 33'7 LOCATION
FLOW PRESSURE [Pitot] Co LINE FLOW CAPACITY I 3p<2 gpm
TEST DATE: 8^I\+{ FLOW TIME 9 cnl 3floo TEsTED BY AL ] E N lov.>

CONDITION OF HYDRANTS TEST HYDRANT FLOW HYDRANT
NEEDS PAINT No- Yes No
NUMBERED No Yes NoNEEDS CLEARANCE No- Yes No
STREET SHUTOFF VISIBLE No Yes_No_

BLUE STREET MARKER
COMMENTS:

Yes
Yes
Yes
Yes
Yes
8-23-23 [REV 8-01-24]
No- Yes NoAgenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

\f ,$ bc #r XHYDRANT TEST INFORMATION RECORD
SINGLE HYDRANT FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPrefewed by Sebastopol FD; not NFPA.I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANT FLOW: At Test Outlet
-
spm Project Available Hydrant Flow gpm 1
MANUFACTURER coNNECTTONS 2% 4%
TEST DATE: FLOW TIME GAL TESTED BY

1. Projected available flows from hydrant calculated at 20 psi residual Ff RE MAf N FLOW TEST - NFPA 2gL Standard Test [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant. Two hydrants are required for this test per NPFA 291;the Test Hydrant f"residual" hydrant] and a Flow Hydrant, which upon opening, will affect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time.

TEST HYDRANT # }{ LOCATION
STATIC PRESSURE 5Ll pst RESIDUAL PRESSURE S Z pst
FLOW HYDRANT # A5 LOCATION
FLOW PRESSURE IPitot] -S I psi LINE FLOW CAPACITY nqe gpm TEST DATE ,94W{ FLow IME ?-- cAL 7-,31b TESTED BY *C I A il 101-<>

CONDITION OF HYDRANTS TEST HYDRANT FLOW HYDRANT
NEEDS PAINT Yes No
NUMBERED Yes
Yes
No Yes _ No

NEEDS CLEARANCE
-No
Yes _ No
STREET SHUTOFF VISIBLE Yes No Yes No

BLUE STREET MARKER

COMMENTS
Yes _ No
8-23-23 [REV 8-01-24]
Yes _ No Yes _ No
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

6-c^'J t'/" +3

HYDRANT TEST INFORMATION RECORD
SINGLE HYDRANT FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPreferred by Sebastopol FD; not NFPA-) TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE IPitot] psi
HYDRANT FLOW: At Test Outlet
-
spm Project Available Hydrant Flow
-
gpm r
MANUFACTURER CoNNECTTONS 2% 4%
TEST DATE: FLOW TIME GAL TESTED BY

1. Projected available flows from hydrant calculated at 20 psi residual F|RE MAf N FLOW TEST - NFPA 2gL Stondord Test [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant. Two h),drants are required for this test per NPFA 291;the Test Hydrant f"residual" hydrant] and a Flow Hydrant, which upon opening, will affeit the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time TEST HYDRANT # ls LOCATION 5--3r
STATIC PRESSURE (o "t pst REsIDUAL PRESSURE 6 o psi
FLOW HYDRANT # I1 LOCATION *" q-B i
FLOW PRESSURE [Pitot] 58 psi LINE FLOW CAPACTTY lLl b gpm rESr DArE: 01V-z; FLow rtME 3 cx 3,83,/r rEsrED ,v f+c f en/ o-7 v.{

CONDITION OF HYDRANTS TEST HYDRANT FLOW HYDRANT
NEEDS PAINT Yes _ No Yes No
NUMBERED Yes No Yes NoNEEDS CLEARANCE Yes No

STREET SHUTOFF VISIBLE

BLUE STREET MARKER
Yes No
Ye
Ye
s
s
No Yes NoCOMMENTS
8-23-23 [REV 8-01-24]
No Yes No
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

9'
1S
s ST
Seo\A+bu''7 'tF''t

HYDRANT TEST INFORMATION RECORD
SINGTE HY FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPrefewed by Sebastopol FD; not NFPA.) TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANT FLOW: At Test Outlet
-
spm Project Available Hydrant Flow gpm 1
MANUFACTURER CoNNECT|ONS 2% 4%
TEST DATE: FLOW TIME GAL TESTED BY
t. Projected available flows from hydrant calculated at 20 psi residual Ff RE MAf N FLOW TEST - NFPA 291. Standard Iest [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant. Two hydrants are required for this test per NPFA 29I;the Test Hydrant ["residual" hydrant] and a Flow Hydrant, which upon opening, will affect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time.

TEST HYDRANT # I.{J LOCAflON l+"J.u" 't-z
sTATlc PREssURE Bb psi RESIDUAL PRESSURE b.-J psi
FLOW HYDRANT # t{ I LOCATION -t
FLOW PRESSURE [Pitot] 4 tl psi LINE FLOW gApAglTv \\\',7 gpm TEST DATE: $-tv1- L5 FLow 1ME 3 GAL g37q TESTED By Oc Ie N

CONDITION OF HYDRANTS FLOW HYDRANT
NEEDS PAINT No Yes No

NUMBERED
-NoYes NoNEEDS CLEARANCE Yes No
STREET SHUTOFF VISIBLE Yes_No_ Yes NoYes
Yes

TEST HYDRANT
Yes No

BLUE STREET MARKER
COMMENTS:

No8-23-23 [REV 8-01-24]
Yes Yes NoAgenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

N"Ah f{",n * 5

HYDRANT TEST INFORMATION RECORD
SINGTE HYDRANT FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPreferred by Sebastopol FD; not NFPA'I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANT FLOW: At Test Outlet _ spm Project Available Hydrant Flow gpm 1 MANUFACTURER CoNNECTTONS 2% 4%

TEST DATE FLOW TIME GAL TESTED BY
L. Projected available flows from hydrant calculated at 20 psi residual FIRE MAIN FIOW TEST - NFPA 297 Standord Test [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant. Two h),drants are required for this test per NPFA 291;the Test Hydrant ["residual" hydrant] and a Flow Hydrant, which upon opening, will affect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time.

TEST HYDRANT# 63 LOCATION
STATIC PRESSURE sq psi RESIDUAL PRESSURE Sb psi
FLOW HYDRANT # 61 LOCAION llyrl #r-tlB
FLOW PRESSURE lPitot] 5 5 psi LINE FLow 6apas17v lZ41 spm rESr DArE,0"Iq-Lf FLOW TIME UI GAL 4jtu TESTED BY N lril f)to

CONDITION OF HYDRANTS

NEEDS PAINT

NUMBERED

NEEDS CLEARANCE

STREET SHUTOFF VISIBLE

BLUE STREET MARKER
COMMENTS:

TEST HYDRANT FLOW HYDRANT
Yes No
Yes NoYes No
Yes No
Yes
Yes
Yes
Yes
Yes
No
-No-NoNo8-23-23 [REV 8-01-24]
No Yes No
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

$"o5arJe\ 'S I

HYDRANT TEST INFORMATION RECORD
SINGLE HYDRANT FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPrefewed by Sebastopol FD; not NFPA.I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANTFLoW:AtTestoutlet-gpmProjectAvailableHydrantFlow-gpmr MANUFACTURER coNNECT|ONS 2% 4%

TEST DATE FLOW TIME GAL TESTED BY

1. Projected available flows from hydrant calculated at 20 psi residual FIRE MAIN FLOW TEST - NFPA 291. Standard Test [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant. Two hvdrants are required for this test per NPFA 291;the Test Hydrant ["residual" hydrant] and a Flow Hydrant, which upon opening, will affect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time.

TEST HYDRANT# 6O LOCATION
STATIC PRESSURE 5 \.> pst RESIDUAL PRESSURE S L[ psi
FLow HYDRANT # 5"1 LocAIoN A# *# Tzg
FLOW PRESSURE [Pitot] SL psi LINE FLOW 6apag17v \ ,784 8pm TEST DATE: 8-lL4'-L{ FLow 1ME t{ cAL s t SQ, rEsrED By k- t oXJ [ 000

CONDITION OF HYDRANTS TEST HYDRANT FLOW HYDRANT
NEEDS PAINT No- Yes No
NUMBERED No Yes_No_
NEEDS CLEARANCE No- Yes No
STREET SHUTOFF VISIBLE No Yes _ No

BLUE STREET MARKER
COMMENTS:

Yes
Yes
Yes
Yes
Yes
8-23-23 [REV 8-0L-24]
No Yes No
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

t1

HYDRANT TEST INFORMATION RECORD
SINGLE HYDRANT FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPreferred by Sebastopol FD; not NFPA.I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANT FLOW: At Test Outlet
-
spm Project Available Hydrant Flow gpm I
MANUFACTURER coNNECTTONS 2% 4%

TEST DATE FLOW TIME GAL TESTED BY

1. Projected available flows from hydrant calculated at 20 psi residual FIRE MAIN FLOW TEST - NFPA 291 Stondord lesf [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant. Two hydrants are required for this test per NPFA 291;the Test Hydrant f"residual" hydrant] and a Flow Hydrant, which upon opening, will affect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time TESTHYDRANT# 52 LOCATION fl -L/ (
STATIC PRESSURE bb psi RESIDUAL PRESSURE ("tl psi
FLOW HYDRANT # 1q LOCATION 1-lqotr* 2-3D
FLOW PRESSURE [Pitot] "JO psi LINE FLOW CAPACTTY l4o4 gpm TEST DATE: K^TJ.7i FLOW TIME 3 r,"ri"r GAL 4 rl ?- TESTED BY t+c/fr/ I Sot:

CONDITION OF HYDRANTS TEST HYDRANT FLOW HYDRANT
NEEDS PAINT Yes
Yes
No Yes _ No

NUMBERED
-No
Yes NoNEEDS CLEARANCE Yes No Yes No
STREET SHUTOFF VISIBLE Yes _ No Yes No

BLUE STREET MARKER

COMMENTS
8-23-23 [REV 8-01-24]
Yes No Yes No
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

lFt}
ot
fqctr ci-l tr/s"Lr #et

HYDRANT TEST INFORMATION RECORD
SINGLE HYDRANT FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPrefewed by Sebastopol FD; not NFPA.I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANT FLOW: At Test Outlet
-
spm Project Available Hydrant Flow gpm 1
MANUFACTURER coNNECTTONS 2% 4%
TEST DATE: FLOW TIME GAL TESTED BY

1. Projected available flows from hydrant calculated at 20 psi residual FIRE MAIN FLOW TEST - NFPA 297 Standord Test [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant. Two hydrants are required for this test per NPFA 291;the Test Hydrant f"residual" hydrant] and a Flow Hydrant, which upon opening, will aflect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time.

TEST HYDRANT # iII LOCATION L^

STATIC PRESSURE
(ot
FLOW HYDRANT # I1 LOCATION # \^tz
FLOW PRESSURE [Pitot] b L{ psi L/NE FLOW CAPACITY I
'3"1 Z
TEST DATE. g4v1.L{ FLow 1ME Sorirr GAL L[, o?Ia TEsTED By AC I e UJ D
-1to

CONDITION OF HYDRANTS FLOW HYDRANT
NEEDS PAINT Yes
Yes
No Yes NoNUMBERED
-No
Yes No
NEEDS CLEARANCE Yes NoSTREET SHUTOFF VISIBLE Yes _ No Yes No

BLUE STREET MARKER

COMMENTS
pst RESIDUAL PRESSURE b { pst
gpm

TEST HYDRANT
Yes No
8-23-23 [REV 8-01-24]
Yes No Yes _ No
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

lFo
+1

HYDRANT TEST INFORMATION RECORD
SINGLE HYDRANT FIOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPreferred by Sebastopol FD; not NFPA.I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANTFLoW:AtTestoutlet-gpmProjectAvailableHydrantFlow gpm 1 MANUFACTURER coNNECTTONS 2% 4%

TEST DATE FLOW TIME GAL TESTED BY

1. Projected available flows from hydrant calculated at 20 psi residual FIRE MAIN FLOW TEST - NFPA 29L Standard lest [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant. Two hydrants are required for this test per NPFA 29l;the Test Hydrant ["residual" hydrant] and a Flow Hydrant, which upon opening, will affect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time TEST HYDRANT # ,1 V LOCATION YludtP 2-t>
STATIC PRESSURE 15 psi RESIDUAL PRESSURE
*lb
pst
FLOW HYDRANT # bq LOCATION H.1c\ i' z- 3z
FLOW PRESSURE [Pitot] bk psi L/iNE FLOW CAPAC\TY lj('3 gpm TEST DATE: T.I1'.L5 FLOW TIME 3 rrt^ 641 Lt ogq TESTED BY Ac/trl It{ zo

CONDITION OF HYDRANTS TEST HYDRANT FLOW HYDRANT
NEEDS PAINT Yes _ No

NUMBERED

NEEDS CLEARANCE

STREET SHUTOFF VISIBLE

BLUE STREET MARKER
Yes
Yes
Yes
Yes
No
No
NoYes No
Yes No
Yes No
-No

COMMENTS
8-23-23 [REV 8-01-24]
Yes No- Yes No
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

$rc

HYDRANT TEST INFORMATION RECORD
SINGLE HYDRANT FLOW TEST [See Testing Directions on Laminated Card] D"t"..ir* available water supply at the selected hydrant. fPreferued by Sebastopol FD; not NFPA-] TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] Psi
HYDRANT FLOW: At Test Outlet
-
spm Project Available Hydrant Flow gpm I
MANUFACTURER CoNNECTIONS 2% 4%
-
TEST DATE: FLOW TIME GAL TESTED BY

1. Projected available flows from hydrant calculated at 20 psi residual F|RE MA|N FIOW TEST - NFPA 2gL Stondord Test [See Testing Directions on Laminated Card] D",t"r-in", the available water supply in the main line at the Test hydrant. Two hydrants are required for this test per NPFA 29|;theTest Flydrant ["residual" hydrant] and a Flow Hydrant, which upon opening, will aflect the residual psi at the TLst Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time TEST HYDRANT # LOCATION t-\ ).t 2- q

STATI C PRESSUR E
*1 I-I psi RESIDUAL PRESSURE
Lt 1 pst
FLow HYDRANT o 6b LOCATI oN a -zo
FLOW PRESSURE [Pitot]
"l 0 si LINE FLOW CAPACITY l-i o'{ gpm
TEST DATE: -t '75 FLow IME 5 ,,,t GAL J ol-0 TESTED BY €.rJ 19oc

CONDITION OF HYDRANTS TEST HYD RANT FLOW HYDRANT
NEEDS PAINT Yes NoNUMBERED Yes No
NEEDS CLEARANCE Yes No
STREET SHUTOFF VISIBLE Yes No- Yes No

BLUE STREET MARKER

COMMENTS
Yes_No_
Yes_No_
Yes No
8-23-23 [REV 8-01-24]
Yes _ No Yes No
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

creL A"s i t$"h A-t th tt

HYDRANT TEST INFORMATION RECORD
SINGLE HYD FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPrefewed by Sebastopol FD; not NFPA.I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANT FLOW: At Test Outlet
-
spm Project Available Hydrant Flow
-
gpm 1
MANUFACTURER CoNNECTTONS 2% 4%

TEST DATE FLOW TIME GAL TESTED BY

1. Projected available flows from hydrant calculated at 20 psi residual F|RE MA|N FLOW TEST - NFPA 291- Stondord Test [See Testing Directions on Laminbted Card] Determines the available water supply in the main line at the Test hydrant. Two h),drants are required for this test per NPFA 291;the Test Hydrant f"residual" hydrant] and a Flow Hydrant, which upon opening, will affect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time.

TE'T H'DRANT # l-IS LOCATION + -a
STATIC PRESSURE L pst RESIDUAL PRESSURE "7 I psi
FLOW HYDRANT # 'T
} [ LOCATION
FLOW PRESSURE [Pitot] 7D nsl LINE FLOW CAPACITY I O L.( gpm TEST DATE: B-IVT+{ FLOW TIME L{ GAL 5,Llb TESTED BY MI ET/ O'los

CONDITION OF HYDRANTS TEST HYDRANT FLOW HYDRANT
NEEDS PAINT Yes _ No Yes NoNUMBERED Yes No Yes No_
NEEDS CLEARANCE Yes No
STREET SHUTOFF VISIBLE Yes_No_ Yes NoBLUE STREET MARKER

COMMENTS
Yes No
8-23-23 [REV 8-01-24]
Yes No Yes _ No
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

*t'tHYDRANT TEST INFORMATION RECORD
SINGLE HYDRANT FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPreferred by Sebastopol FD; not NFPA'I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANTFLoW:AtTestoutlet-gpmProjectAvailableHydrantFlow gpm 1 MANUFACTURER CoNNECTIONS 2% 4%
TEST DATE: FLOW TIME GAL TESTED BY

1. Projected available flows from hydrant calculated at 20 psi residual F|RE MAIN FLOW TEST - NFPA 297 Standard Test [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant' Two h]'drants are required for this test per NPFA 291;the Test Hydrant f"residual" hydrant] and a Flow Hydrant, which upon opening, will affect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time.

TEST HYDRANT# I g? LOCATION i-l"qi. * l- qs
STATIC PRESSURE 1 2 psi RESIDUAL PRESSURE -lo psi
FLOW HYDRANT # i -I .3
LOCATION "5L
FLOW PRESSURE [Pitot] 6 7- psi LINE FLow cAPActTY l SLl gpm TEST DATE: 6-13-2; FLow rtvr Lt n,n GAL 5,28 t'l

TESTED BY L I/
lvl vlv

CONDITION OF HYDRANTS

NEEDS PAINT

NUMBERED

NEEDS CLEARANCE

STREET SHUTOFF VISIBLE

BLUE STREET MARKER

COMMENTS

TEST HYDRANT
Yes _ No
Yes No
Yes _ No
Yes No

FLOW HYDRANT
Yes_No_
Yes No
Yes _ No
Yes No
8-23-23 [REV 8-01-24]
Yes No Yes _ No
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

E\€.roo - A'e- *\3

HYDRANT TEST INFORMATION RECORD
SINGLE HYDRANT FLOW TEST [See Testing Directions on Laminated Card] Determines available *"t"r *ppty at the selected hydrant. lPreferred by Sebastopol FD; not NFPA'I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] Psi
HYDRANT FLOW: At Test Outlet
-
spm Project Available Hydrant Flow
MANUFACTURER CONNECTIONS 2% 4%
TEST DATE: FLOW TIME GAL
-

TESTED BY
TEST HYDRANT # ?'tt LOCATION .F l-l
STATIC PRESSURE 5f psi RESIDUAL PRESSURE st pst
FLOW HYDRANT # al !t LocATloN l-r3
FL9W PRESSURE [Pitot] L3 psi L1NE FLow cAPAcffY l']5L
TEST DATE: 8-tu-z-; FLow
'ME
GAL 9,qqb TESTED BY
tBiD

CONDITION OF HYDRANTS TEST T FLOW HYDRANT
NEEDS PAINT Yes No
NUMBERED Yes NoNEEDS CLEARANCE Yes No
STREET SHUTOFF VISIBLE Yes No

BLUE STREET MARKER

COMMENTS
gpm 1
1,. projected available flows from hydrant calculated at 20 psi residual FtRE MAtN FLOW TEST - NF1A 2g1 Standard Test [see Testing Directions on Laminated card] Determines the availa[le water supply in the main line at the Test hydrant. Two hyd{4nts are required for this test per NPFA 29l;theTest Hydiant ["residual" hydrant] and a Flow Hydrant, which upon opening, will affect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time. gpm
lvin
Yes _ No
Yes _ No
Yes _ No
Yes _ No
Yes _ No
8-23-23 [REV 8-01-24]
Yes_No_
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

P*loL"^o A*t & t"1
COMMENTS:

NUMBERED

NEEDS CLEARANCE

STREET SHUTOFF VISIBLE

BLUE STREET MARKER

HYDRANT TEST INFORMATION RECORD
SINGLE HYDRANT FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPreferred by Sebastopol FD; not NFPA'I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANT FLOW: At Test Outlet
-
spm Project Available Hydrant Flow gpm 1
MANUFACTURER CoNNECTTONS 2% 4%

TEST DATE FLOW TIME GAL TESTED BY

1. Projected available flows from hydrant calculated at 20 psi residual FIRE MAIN FLOW TEST - NFPA 29L Standard Test [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant. Two hydrants are required for this test per NPFA 29|;theTest Hydrant f"residual" hydrant] and a Flow Hydrant, which upon opening, *ltt utt""t the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time TEST HYDRANT # ai*l LOCATION \-o
STATIC PRESSURE b psi RESIDUAL PRESSURE st pst
FLOW HYDRANT # 1_33 LOCATION - D"7
FLOW PRESSURE [Pitot] 58 psi L]NE FLow cAPACffY I t "21 ?:

TEST DATE: g-l\4-Li FLOW TIME t nni'n GAL 3,V 3VI TESTED BY $-l erl l3h)

CONDITION OF HYDRANTS TEST HYDRANT FLOW HYD RANT
NEEDS PAINT No- Yes_No_
gpm
Yes
Yes
Yes
Yes
Yes
No
NoYes No
Yes _ No
No Yes No
8-23-23 [REV 8-01-24]
-No
Yes _ No
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

lo"t\to,n{ Ar< .+ rS

HYDRANT TEST INFORMATION RECORD
SINGLE HYDRANT FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPreferued by Sebastopol FD; not NFPA.I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANT FLOW: At Test Outlet . _---- spm Project Available Hydrant Flow gpm 1 MANUFACTURER coNNECTTONS 2% 4%

TEST DATE FLOW TIME GAL TESTED BY

1. Projected available flows from hydrant calculated at 20 psi residual Ff RE MAIN FLOW TEST - NFPA 297 Standard Test [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant. Two h)rdrants are required for this test per NPFA 291;the Test Hydrant ["residual" hydrant] and a Flow Hydrant, which upon opening, will aflect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time TEST HYDRANT # AL^ LOCATION IJ J * t-at
STATIC PRESSURE VT psi RESIDUAL PRESSURE 53 pst
FLOW HYDRANT # '].1^6 LOCATION Ii + r- 1{
FLOW PRESSURE [Pitot] 5 7 psi
TEST DATE: P)4q-L< FLOW TIME 3
t3o (

LINE FLOW CAPACITY IL IO
GAL 3* b3o rEsrED BY & le vJ
gpm

CONDITION OF HYDRANTS

NEEDS PAINT

NUMBERED

NEEDS CLEARANCE

STREET SHUTOFF VISIBLE

BLUE STREET MARKER

COMMENTS

TEST HYDRANT
Yes No

FLOW HYDRANT
Yes NoYes No
Yes _ No
Yes No
Yes_No_
Yes_No_
Yes No
8-23-23 [REV 8-01-24]
Yes _ No Yes No
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

$ut .\"nu A"e R t L
TEST DATE: 9.\vl-7.t FLow IME Ll
rx;n GAL E/ ? oo TESTED BY

HYDRANT TEST INFORMATION RECORD
SINGLE HYD FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPreferued by Sebastopol FD; not NFPA.I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANT FLOW: At Test Outlet spm Project Available Hydrant Flow gpm 1 MANUFACTURER coNNECTTONS 2% 4%
TEST DATE: FLOW TIME GAL TESTED BY

1. Projected available flows from hydrant calculated at 20 psi residual FIRE MAIN FLOW TEST - NFPA 297 Standard Test [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant. Two h)rdrants are required for this test NPFA 291;the Test Hydrant ["residual" hydrant] and a Flow Hydrant, which upon opening, will affect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time TEST HYDRANT # )-23 LOCATION r{ "* t-:

STATIC PRESSURE I;7 psl RESIDUAL PRESSURE U\ pst
FIOW HYDRANT #
,LL
LOCATION .l -* t-a
FLOW PRESSURE [Pitot] 9D psi LINE FLOW CAPACffY l,'3 Ao gpm Itqo

CONDITION OF HYDRANTS

NEEDS PAINT

NUMBERED

NEEDS CLEARANCE

STREET SHUTOFF VISIBLE
BtUE STREET MARKER

COMMENTS

TEST HYDRANT FLOW HYDRANT
Yes _ No
Yes_No_
Yes No
Yes_No_
Yes
Yes
No
-No
Yes No
Yes _ No
8-23-23 [REV 8-01-24]
Yes No Yes No
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

9rt "t j<",.. A'rt F\?

HYDRANT TEST INFORMATION RECORD
SINGLE HYD FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPreferued by Sebastopol FD; not NFPA.I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] Psi
HYDRANT FLOW: At Test Outlet
-
spm Project Available Hydrant Flow gpm 1
MANUFACTURER CoNNECTTONS 2% 4%

TEST DATE FLOW TIME GAL TESTED BY

1. Projected available flows from hydrant calculated at 20 psi residual FIRE MAIN FLOW TEST - NFPA 291 Stondord Test [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant. Two h)'drants are required for this test per NPFA 291;the Test Hydrant f"residual" hydrant] and a Flow Hydrant, which upon opening, will affeit the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time.

TEST HYDRANT # 7I LOCATION +\-
STATIC PRESSURE b\
FLOW HYDRANT # L\1 LOCATION \-3
FLoW PRESSURE [Pitot] S1 psi LINE FLow cepecnv 1794
TEST DATE: 81U.2' FLoWTIME $UIVI GAL 5, \ 5b TESTED BY ALI NJ t l3o

CONDITION OF HYDRANTS

NEEDS PAINT

NUMBERED

NEEDS CLEARANCE

STREET SHUTOFF VISIBLE

BLUE STREET MARKER

COMMENTS
psi RESIDUAL PRESSURE L3

FLOW HYDRANT
Yes Nopst
gpm

TEST HYDRANT
Yes
Yes
No
-No- Yes No
Yes _ No
Yes _ No
Yes No
Yes _ No
8-23-23 [REV 8-01-24]
Yes No Yes NoAgenda Item Number 11 Agenda Item Number 11 City Council Meeting Packet for May 5, 2026

LJn,\ Q'"J r* \b

HYDRANT TEST INFORMATION RECORD
SINGLE HYDRA NT FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPreferred by Sebastopol FD; not NFPA'I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANT FLOW: At Test Outlet
-
spm Project Available Hydrant Flow gpm 1
MANUFACTURER CONNECTIONS 2% 4%
TEST DATE: FLOW TIME GAL TESTED BY
L. Projected available flows from hydrant calculated at 20 psi residual F|RE MAIN FLOW TEST - NFPA 2gL Standard Test [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant' Two h)'drants are required for this test per NPFA 291;the Test Hydrant ["residual" hydrant] and a Flow Hydrant, which upon opening, will affect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time' TEST HYDRANT # \C4 b LOCATION
STATIC PRESSURE sb pst RESIDUAL PRESSURE 4T' psi
FLOW HYDRANT # \17 LOCATION c,..' H I
FLoW PRESSURE [Pitot] 4 5 psi LINE FL^W sapaglTv ll Ld gpm TEST DATE: 8"1'"1'z{ FLOW TIME 3 G^L *W TESTED BY AC- I E TI ()-
lb 5o

CONDITION OF HYDRANTS

NEEDS PAINT

NUMBERED

NEEDS CLEARANCE

STREET SHUTOFF VISIBLE

BLUE STREET MARKER
COMMENTS:

TEST HYDRANT
Yes No
Yes _ No
Yes No
Yes _ No

FLOW HYDRANT
Yes _ No
Yes_No_
Yes No
Yes No
3,319,
8-23-23 [REV 8-01-24j
Yes No Yes No
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

L.1n.k $l' *L r'1

HYDRANT TEST INFORMATION RECORD
SINGLE HYDRANT FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPrefewed by Sebastopol FD; not NFPA.I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANT FLOW: At Test Outlet _ spm Project Available Hydrant Flow gpm 1 MANUFACTURER coNNECTTONS 2% 4%
TEST DATE: FLOW TIME GAL TESTED BY
L. Projected available flows from hydrant calculated at 20 psi residual FIRE MAf N FLOW TEST - NFPA 297 Stondard Test [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant. Two hvdrants are required for this test per NPFA 291',the Test Hydrant f"residual" hydrant] and a Flow Hydrant, which upon opening, will affect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time.

TEST HYDRANT # 38 T LOCATION .* roSTATIC PRESSURE ^7b pst RESIDUAL PRESSURE 26 psi FLOW HYDRANT # 3ItO LOCATION io.-l
FLOW PRESSURE [Pitot] 1 nsi LINE FLow cAPActTY b17 gpm
TEST DATE: ]-Iq-Li FLow r';tv,E 3rui'a
J rrf

CONDITION OF HYDRANTS
NEEDS PAINT Yes
Yes
No

NUMBERED
-NoNEEDS CLEARANCE Yes No
STREET SHUTOFF VISIBLE Yes NoBLUE STREET MARKER

COMMENTS
cAL 2{" lra t+cler)

TEST HYDRANT

TESTED BY

FLOW HYDRANT
Yes No
Yes_No_
Yes No
Yes_No_
8-23-23 [REV 8-01-24]
Yes No- Yes No
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Lloeh u'I :tt1-o

HYDRANT TEST INFORMATION RECORD
SINGIE HYDRANT FLOW TEST [See Testing Directions on Laminated Card] Determines available water supply at the selected hydrant. lPrefewed by Sebastopol FD; not NFPA.I TEST HYDRANT # LOCATION
STATIC psi RESIDUAL psi FLOW PRESSURE [Pitot] psi
HYDRANT FLOW: At Test Outlet
-
spm Project Available Hydrant Flow gpm 1
MANUFACTURER coNNECTTONS 2% 4%
TEST DATE: FLOW TIME GAL TESTED BY
t. Projected available flows from hydrant calculated at 20 psi residual F|RE MAIN FLOW TEST - NFPA 291- Stondard Test [See Testing Directions on Laminated Card] Determines the available water supply in the main line at the Test hydrant. Two hydrants are required for this test per NPFA 29\the Test Hydrant ["residual" hydrant] and a Flow Hydrant, which upon opening, will affect the residual psi at the Test Hydrant. Pitot gauge measures psi at Flow Hydrant at the same time.

TEST HYDRANT # 36.7 LOCATION

STATIC PRESSURE
FLOW HYDRANT # 374 LOCATION
NUMBERED Yes
Yes
No
NEEDS CLEARANCE _No
STREET SHUTOFF VISIBLE Yes No

BLUE STREET MARKER

COMMENTS
pst RESIDUAL PRESSURE bL
to"
bq pst
FLOW PRESSURE [Pitot] [8 psi LINE FLOW CAPACTTY I j.aLl TEST DATE: 9-lq 'Lf FLOWTIME 3 GAL L{, \ 5 2- rEsrED By 6N) ,) oc)

CONDITION OF HYDRANTS TEST HYDRANT FLOW HYDRANT
NEEDS PAINT Yes Nogpm
Yes _ No
Yes No
Yes NoYes No
8-23-23 [REV 8-01-24]
Yes No Yes NoAgenda Item Number 11 Agenda Item Number 11 City Council Meeting Packet for May 5, 2026

ghd.com The Power of Commitment
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Welcome
Matt Kennedy
Project Director
Abhishek Kumar
Project Manager
Water Master Plan (Final Draft)
City of Sebastopol
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Agenda
Example

1.Safety Moment

2.Updated Water Master Plan Report
a.Existing System
b.Model Development
c.Water Demand Projections
d.Water System Analysis
e.CIPs and Cost Estimates

3.Council’s Feedback

4.Final Steps and Q/A
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Scope/Objectives
– Water system evaluation – supply, storage and
distribution
– Hydraulic model update
– Capital Improvement Projects (CIPs)
Updates in this Report
– Water distribution system model
– Water demand and projection
– Fire flow requirement
– Storage requirement
– CIPs
Updated Water Master
Plan Report
4 [Footer] l © 2025 GHD. All rights reserved.

Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Components Details
Watermains – 38 miles
– Materials: AC, DI, CI and PVC
Average Water
Demands
– 290 MG/year or 552 GPM (2018-2024)
Water Supply – Zone 1: Wells 4 & 7
• 233 MG (2018-2024)
– Zone 2: Wells 6 & 8
• 78 MG (2018-2024)
– Stable groundwater level (2018-2023)
Water Storage – Zone 1: x1 (1.5 MG total)
– Zone 2: x2 (3 MG total)
Raw Water Quality – Arsenic (4 µg/L avg) in water source – remediated by blending
– PCE contamination in Well 4
– GAC filtration system in Well 4
Existing System
5 [Footer] l © 2025 GHD. All rights reserved.

Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Model Calibration
- Calibrated with 20 hydrant flow tests
- Modelled pressure vs field static pressure
• Range ± 5 psi
Modelling
6 [Footer] l © 2025 GHD. All rights reserved.
2005 WaterCAD Model
Weekly Water Production
Data (2018-2024)
Sonoma DTM
(3-ft resolution)
Recent Development
Drawings
Model Network:
– Watermain
– Junctions
Junction Demand
Junction Elevation
Updated Water Model
(Steady-state)
GHD Field Study GIS
Well Location
Valves
Age-based C-Factor
Model Build
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Water System Analysis
7 [Footer] l © 2025 GHD. All rights reserved.

Scenarios 2025 (GPM
per node)
2045 (GPM
per node)
ADD 0.74 0.86
MDD 1.48 1.72
PHD 3.70 4.29
Water Demands
Peaking Factors:
• 2.0 (MDD)
• 5.0 (MHD)
Evaluation Criteria
– Pressure
• Desired Minimum Pressure at Peak Hour Demand:
40 psi
• Desired Minimum Pressure at Maximum Daily
Demand plus Fire Flow: 20 psi
• Desired Maximum Service Pressure: 100 psi
– Available Fire Flow
• Minimum = 1,500 GPM @ 20 psi (as per CFC)
– Water Storage Requirement
• Storage Requirement v.s. Storage Available
• Operational + Equalization + Fire
– Operational: 100% of ADD in Gallons
– Equalization: 25% of MDD in Gallons
– Fire: 540,000 Gallons
Pressure
Zone
Classification
Operational
Storage
(gallon)
Equalizatio
n Storage
(gallon)
Fire
Storage
(gallon)
Zone Total
(gallon)
1 639,706 319,853 540,000 1,499,560
2 212,406 106,203 540,000 858,609
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Pressure
– Most of the system falls within 40-100 psi
– Areas below 40 psi: Pleasant Hill Road, West Hill Circle, Golden Ridge Avenue, Hayden Avenue
Available Fire Flow
– Most of the hydrants meet the criteria of 1,500 GPM at 20 psi – Hydrants below 1,500 GPM: Dead ends
Water Storage Requirement
– Both Zone 1 and Zone 2 meet the storage requirement
Water System Analysis
– Existing Condition
8 [Footer] l © 2025 GHD. All rights reserved.

Pressure Zones Total Storage
Requirement
(Gallon)
Reservoir
Capacities
(gallon)
1 1,499,560 1,500,000
2 858,609 6,000,000
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Pressure
– Most of the system falls within 40-100 psi
– Areas below 40 psi: Similar to the existing
condition.

Available Fire Flow
– Most of the hydrants meet the criteria of 1,500
GPM at 20 psi
– Hydrants below 1,500 GPM: Dead ends
Water Storage Requirement
– In year 2045, the water storage requirement for
Pressure Zone 1 will exceed its reservoir
capacity by 10%
– Total storage in the City is sufficient for the City
as a whole and interties are available to allow
water to flow from Pressure Zone 2 to Pressure
Zone 1
Water System
Analysis – Year 2045
9 [Footer] l © 2025 GHD. All rights reserved.

Pressure Zones Total Storage
Requirement
(Gallon)
Reservoir
Capacities
(gallon)
Additional
Required Storage
(gallon)
1 1,643,430 1,500,000 143,000
2 906,401 6,000,000 0
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

2 Covert Lane CI Watermain Replacement
3 Ellis Court CI Watermain Replacement
4 Valley View Drive Water Service Connection Replacement 5 Well 4 Replacement
6 Gwendolyn Place Water Service Connection Replacement
7 500 South Main Street Watermain Replacement
8 Replacement of Existing Pressure Reducing Valves
9 Painting and Relining of Existing Water Tanks
10 Structural Assessment of Existing Water Tanks
11 Seismic Retrofit Study for Existing Water Tanks
12 Installation of Isolation Valves
13 Installation of Automated Flow Meter
Total
CIPs and Cost Estimates
10 [Footer] l © 2025 GHD. All rights reserved.

Link: CIPs Excel
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026

Thank you
Agenda Item Number 11 Agenda Item Number 11
City Council Meeting Packet for May 5, 2026