Agenda packet, second session — Brentwood City Council, May 26, 2026 (part 10 of 12)

2025 Urban Water Management Plan Section 10: References 10-2
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.

Contra Costa Local Agency Formation Commission (CCLAFCO).Water and Wastewater Services Municipal Services Municipal Services Review for East Contra Costa County. December 19, 2007.

Delta Stewardship Council. Delta Adapts: Creating a Climate Resilient Future – Vulnerability Assessment.

Sacramento, CA. 2021a
Delta Stewardship Council. Delta Adapts: Creating a Climate Resilient Future – Water Supply Technical Memorandum. Sacramento, CA. 2021b.

De Novo Planning Group. City of Brentwood General Plan. 2014.

East Contra Costa County (ECCC). East Contra Costa County Integrated Regional Water Management Plan, Update 2019. March 2019.

East Contra Costa Groundwater Sustainability Agencies (ECCGSA).Memorandum of Understanding, Development of a Groundwater Sustainability Plan for the East Contra Costa County Portion of the Tracy Subbasin, (DWR Basin 5-

22.15, San Joaquin Valley). May 2017. Accessed at:
https://static1.squarespace.com/static/5ca391a8a87b100001fc6975/t/5cd2fc8dec212da02c3691d5/155 7331092103/SGMA_ECCGSA_FinalMOU-signed.pdf
East Contra Costa Groundwater Sustainability Agencies (ECCGSA). Amended and Reinstated Memorandum of Understanding, Development of a Groundwater Sustainability Plan for the East Contra Costa County Portion of the Tracy Subbasin, (DWR Basin 5-22.15, San Joaquin Valley). April 2020. Accessed at: Sustainable Groundwater Management Act (SGMA) Portal - Department of Water Resources East Contra Costa Groundwater Sustainability Agencies (ECCGSA). Second Amended and Reinstated Memorandum of Understanding, Implementation of a Groundwater Sustainability Plan for the East Contra Costa Subbasin, (DWR Basin 5-22.19, San Joaquin Valley). 2022.

East Contra Costa Groundwater Sustainability Agencies (ECCGSA). Groundwater Sustainability Plan East Contra Costa Subbasin. October 2021. Prepared by Luhdorff & Scalmanini Consulting Engineers. Accessed at:
https://www.eccid.org/groundwater-sustainability-agency Mote, P. W., Li, S., Lettenmaier, D. P., Xiao, M., & Engel, R. Dramatic declines in snowpack in the western U.S. npj Climate and Atmospheric Science, 1(1), Article 2. 2018. https://doi.org/10.1038/s41612-018-0012-1 Pierce, D. W., Das, T., Cayan, D. R., Maurer, E. P., Miller, N. L., Bao, Y., Kanamitsu, M., Yoshimura, K., Snyder, M. A., Sloan, L. C., Franco, G., & Tyree, M. Probabilistic estimates of future changes in California temperature and precipitation using statistical and dynamical downscaling. Climate Dynamics, 40(3–4), 839–856. 2013.https://doi.org/10.1007/s00382-012-1337-9
Pierce, D. W., Kalansky, J. F., & Cayan, D. R. Climate, drought, and sea level rise scenarios for California’s Fourth Climate Change Assessment. California Energy Commission, Publication No. CCCA4-CEC-2018-006. 2023.

Raftelis Financial Consultants, Inc.. Water and Wastewater Rate Study. April 11, 2023.

Rhoades, A. M., Ullrich, P. A., & Zarzycki, C. M. Projecting 21st-century snowpack trends in western USA mountains using variable-resolution CESM. Climate Dynamics, 50, 261–288. 2048. https://doi.org/10.1007/s00382-017- 3606-0
Sun, F., Walton, D. B., Hall, A., Capps, S. B., Ban, N., Schwartz, M., & Huang, X. Mechanisms of future snowpack decline in the western United States. Geophysical Research Letters, 46(7), 4158–4167. 2019.https://doi.org/10.1029/2019GL082401
Swain, D. L., Langenbrunner, B., Neelin, J. D., & Hall, A. Increasing precipitation volatility in twenty-first-century California. Nature Climate Change, 8, 427–433. 2018. https://doi.org/10.1038/s41558-018-0140-y United States Census Bureau (Census Bureau). United States Census Bureau Quick Facts for Contra Costa County, California. Accessed December 2025 at: https://www.census.gov/quickfacts/contracostacountycalifornia

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2025 Urban Water Management Plan
A
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.

Appendix A: DWR Urban Water Management Plan
Checklist

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2025 Urban Water Management Plan Appendix A
A
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.

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Appendix A
Urban Water Management Plan Checklist
January 2026 Page A-1
Table A-1. Urban Water Management Plan Checklist
Retail
(x = required)
Wholesale
(x = required)
2025 Guidebook
Location
Water Code
Section
Summary as Applies to UWMP Subject Relevant
Submittal Table
2025
UWMP
Location
x x Chapter 1 10615 A plan shall describe and evaluate sources of supply, reasonable and practical efficient uses, reclamation and demand management activities.

Introduction and
overview
n/a Section 1
x x Chapter 1 10630.5 Each plan shall include a simple description of the Supplier’s plan including water availability, future requirements, a strategy for meeting needs, and other pertinent information.

Additionally, a Supplier may also choose to include a simple description at the beginning of each chapter.

Plan preparation n/a Section 1.2
x x Section 2.1 10620(b) Every person that becomes a Supplier shall adopt UWMP within one year after it has become a Supplier.

Plan preparation n/a Section 1.1
x n/a Section 2.5 10644 Supplier shall report the Public Water Systems number, volume of delivered water, and number of connections that are included in this UWMP.

Plan preparation DWR Table 2-1 Section 2.1
Table 2-1
x x Section 2.5 10644 Supplier shall report if this UWMP is an individual UWMP and whether the Supplier belongs to a regional UWMP or regional alliance.

Plan preparation DWR Table 2-2 Section 2.1
Table 2-2
x x Section 2.5 10644 Supplier shall report whether the data is in fiscal or calendar years and the units of measure used for reporting water volumes.

Plan preparation DWR Table 2-3 Section 2.1
Table 2-3
x x Section 2.4 10642 Provide supporting documentation that the Supplier has encouraged active involvement of diverse social, cultural, and economic elements of the population within the service area prior to and during the preparation of the plan and contingency plan.

Plan preparation n/a Section 2.2
x x Section 2.4.2 10620(d)(3) Coordinate the preparation of its plan with other appropriate agencies in the area, including other Suppliers that share a common source, water management agencies, and relevant public agencies, to the extent practicable.

Plan preparation n/a Section 2.2
x n/a Section 2.4.1 10631(h) Retail Suppliers will include documentation that they have provided their Wholesale Supplier(s)—if any—with water use projections from that source.

Plan preparation DWR Table 2-4 R Section 2.2
Table 2-4
n/a x Section 2.4.1 10631(h) Wholesale Suppliers will provide their Suppliers with identification and quantification of the existing and planned sources of water available from the Wholesale Supplier to the Supplier during various water year types.

Plan preparation 2-4 W n/a
x x Chapter 3.0 10631(a) Describe the Supplier service area. System description n/a Section 3.1 x x Section 3.3 10631(a) Describe the climate of the Supplier’s service area. System description n/a Section 3.2 x x Section 3.4.1 10631(a) Provide the current and projected service area populations for 2030, 2035, 2040, 2045 and optionally 2050.

System description DWR Table 3-1 Section 3.4
Table 3-2
x x Section 3.4.2 10631(a) Describe other social, economic, and demographic factors affecting the Supplier’s water management planning.

System description n/a Section 3.4.2
x x Section 3.5 10631(a) Describe the land uses within the service area… include the current and projected land uses within the existing or anticipated service area affecting the Supplier’s water management planning. Describe the land uses within the service area.

System description
and baselines
n/a Section 3.4
x Optional Sections 4.2.3 and

4.2.4 10631(d)(1) Quantify past, current, and projected water use, identifying the uses among water use sectors.

System water use DWR Table 4-1
DWR Table 4-2
Section 4.1
Table 4-1
Section 4.5
Table 4-5
x Optional Section 4.3.1 10631(d)(3)(A) Report the distribution system water loss for each of the five years preceding the plan update.

System water use DWR Table 4-5 Section 4.3.1
Table 4-2
x n/a Section 4.3.2 10631(d)(3)(C) Retail Suppliers shall provide data to show the distribution loss standards were met. System water use DWR Table 4-6 Section 4.3.2 Table 4-3
x n/a Section 4.2.5.4 10631.1(a) Include projected water use needed for lower income housing projected in the service area of the Supplier.

System water use DWR Table 4-3 Section 4.7
Table 4-7

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Appendix A
Urban Water Management Plan Checklist
January 2026 Page A-2
Retail
(x = required)
Wholesale
(x = required)
2025 Guidebook
Location
Water Code
Section
Summary as Applies to UWMP Subject Relevant
Submittal Table
2025
UWMP
Location
x n/a Section 4.2.5.3 10631(d)(4)(A) In projected water use, include estimates of water savings from adopted codes, plans, and other policies or laws.

System water use DWR Table 4-3 Section 4.4
Section 4.7
Table 4-7

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Appendix A
Urban Water Management Plan Checklist
January 2026 Page A-3
Retail
(x = required)
Wholesale
(x = required)
2025 Guidebook
Location
Water Code
Section
Summary as Applies to UWMP Subject Relevant
Submittal
Table
2025
UWMP
Location
x n/a Section 4.2.5.3 10631(d)(4)(B) Provide citations of codes, standards, ordinances, or plans used to make water use projections. System water use DWR Table 4-3 Section 4.7 Table 4-7
x n/a Section 4.2.5.3 10631(d)(4)(B)(ii) To the extent that a Supplier reports the information described in subparagraph (A), an urban water Supplier shall… Indicate the extent that the water use projections consider savings from codes, standards, ordinances, or transportation and land use plans. Water use projections that do not account for these water savings shall be noted of that fact.

System water use DWR Table 4-3 Section 4.7
Table 4-7
x x Section 4.2.5.6 10635(b) Demands under climate change considerations must be included as part of the drought risk assessment.

System water use n/a Section 6.5
Section 3.3
n/a x Section 5.1 10608.36 Wholesale Suppliers shall include an assessment of present and proposed future measures, programs, and policies to help their Retail Suppliers achieve targeted water use reductions.

Baselines and targets n/a n/a
x n/a Section 5.2 10608.40 Retail Suppliers shall report on their compliance in meeting their water use targets. Reporting requirements will vary depending on whether the Supplier:
- Was considered an urban retail water supplier in 2020, - Met its 2020 target in 2020, or
- Was part of a merger or consolidation since 2020.

Chapter 5 Subsections 5.2.1, 5.2.2, and 5.2.3 address each of these situations.

Baselines and targets DWR Table 5-1 Section 4.6
Table 4-6
x x Section 6.1 10631(b)(2) When multiple sources of water supply are identified, describe the management of each supply in relationship to other identified supplies.

System supplies n/a Section 5
x x Sections 6.1 and

6.2 10631(b)(1) Provide a discussion of anticipated supply availability under a normal, single dry year, and a drought lasting five years, as well as more frequent and severe periods of drought, including changes in supply due to climate change.

System supplies n/a Section 6.2
x x Section 6.2.2 10631(b)(4)(C) Indicate whether groundwater is an existing or planned source of water available to the Supplier. If groundwater is identified as an existing or planned source of water… (include) a detailed description and analysis of the location, amount and sufficiency of groundwater pumped by the Supplier for the past five years.

Water supplies and
recycled water
DWR Table 6-1 Section 5.3.4
Table 5-1
x x Section 6.2.2 10631(b)(4)(A) Indicate whether a groundwater sustainability plan or groundwater management plan has been adopted by the Supplier or if there is any other specific authorization for groundwater management. Include a copy of the plan or authorization.

System supplies n/a Section 5.3.3
x x Section 6.2.2 10631(b)(4)(B) Describe the groundwater basin. System supplies n/a Section 5.3.1 x x Section 6.2.2 10631(b)(4)(B) Indicate if the basin has been adjudicated and include a copy of the court order or decree and a description of the amount of water the Supplier has the legal right to pump.

System supplies n/a Section 5.3.1
x x Section 6.2.2 10631(b)(4)(B) For unadjudicated basins… (include) information as to whether DWR has identified the basin as a high- or medium-priority basin in the most current official departmental bulletin… Water supplies and
recycled water
n/a Section 5.3.1
x x Section 6.2.2 10631(b)(4)(B) For unadjudicated basins… describe efforts by the Supplier to coordinate with sustainability or groundwater agencies to achieve sustainable groundwater conditions.

Water supplies and
recycled water
n/a Section 5.3.1
x x Section 6.2.2. 10631(b)(4)(C) If groundwater is identified as an existing or planned source of water… (include) a detailed description and analysis of the location, amount and sufficiency of groundwater pumped by the Supplier for the past five years.

System supplies n/a Section 5.3.3
x x Section 6.2.2 10631(b)(4)(D) Provide a detailed description and analysis of the amount and location of groundwater that is projected to be pumped.

System supplies DWR Table 6-9 Section 5.9
Table 5-9
x x Section 6.1 10631(b) Identify and quantify the existing and planned sources of water available for 2025, 2030, 2035, 2040, 2045 and optionally 2050.

System supplies DWR Table 6-8
DWR Table 6-9
Section 5.9
Table 5-8
Table 5-9
x x Section 6.2.7 10631(c) Describe the opportunities for exchanges or transfers of water on a short-term or long-term basis.

System supplies n/a Section 5.7

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Appendix A
Urban Water Management Plan Checklist
January 2026 Page A-4
Retail
(x = required)
Wholesale
(x = required)
2025 Guidebook
Location
Water Code
Section
Summary as Applies to UWMP Subject Relevant
Submittal Table
2025
UWMP
Location
x n/a Section 6.2.5 10633(a) Describe the wastewater collection and treatment systems in the Supplier’s service area with quantified amount of collection and treatment and the disposal methods.

System supplies
(recycled water)
DWR Table 6-2 Section 5.5.2
Table 5-2
x x Section 6.2.5 10633(b) Describe the quantity of treated wastewater that meets recycled water standards, is being discharged, and is otherwise available for use in a recycled water project.

System supplies
(recycled water)
DWR Table 6-3 Section 5.5.2
Table 5-3
x x Section 6.2.5 10633(c) Describe the recycled water currently being used in the Supplier's service area. System supplies (recycled water)
n/a Section 5.5.3
x x Section 6.2.5 10633(d) Describe and quantify the potential uses of recycled water and provide a determination of the technical and economic feasibility of those uses.

System supplies
(recycled water)
DWR Table 6-4 Section 5.5.4
Table 5-4
x x Section 6.2.5 10633(e) Describe the projected use of recycled water within the Supplier's service area at the end of 5, 10, 15, and 20 years, and describe the actual use of recycled water in comparison to uses previously projected.

System supplies
(recycled water)
DWR Table 6-4
DWR Table 6-5
Section 5.5.4
Table 5-4
Table 5-5
x x Section 6.2.5 10633(f) Describe the actions that may be taken to encourage the use of recycled water and the projected results of these actions in terms of acre-feet of recycled water used per year.

System supplies
(recycled water)
DWR Table 6-6 Section 5.5.5
Table 5-6
x x Section 6.2.5 10633(g) Provide a plan for optimizing the use of recycled water in the Supplier's service area. System supplies (recycled water)
n/a Section 5.5.5
x x Section 6.2.6 10631(g) Describe desalinated water project opportunities for long-term supply. System supplies n/a Section 5 (Introduction)
x x Section 6.2.10 10631(f) Describe the expected future water supply projects and programs that may be undertaken by the water Supplier to address water supply reliability in average, single-dry, and for a period of drought lasting five consecutive water years.

System supplies DWR Table 6-7 Section 5.8
Table 5-7
x x Section 6.3 and
Appendix O
10631.2(a) The UWMP must include energy information, as stated in the code, that a Supplier can readily obtain.

System
suppliers,
energy
intensity
DWR Table O-1C Section 5.10
Table 5-10
x Section 7.1 10634 Provide information on the quality of existing sources of water available to the Supplier and the manner in which water quality affects water management strategies and supply reliability.

Water supply
reliability
assessment
n/a Section 6.1
x x Section 7.2 10635(a) Service Reliability Assessment: Assess the water supply reliability during normal, dry, and a drought lasting five consecutive water years by comparing the total water supply sources available to the Supplier with the total projected water use over the next 20 years.

Water supply
reliability
assessment
DWR Table 7-2
DWR Table 7-3
DWR Table 7-4
Section 6.3
Table 6-4
Table 6-5
Table 6-6
x x Section 7.2.3 10620(f) Describe water management tools and options to maximize resources and minimize the need to import water from other regions.

Water supply
reliability
assessment
n/a Section 6.4
x x Section 7.3 10635(b) Provide a drought risk assessment as part of information considered in developing the demand management measures and water supply projects.

Water supply
reliability
assessment
n/a Section 6.5
x x Section 7.3 10635(b)(1) Include a description of the data, methodology, and basis for one or more supply shortage conditions that are necessary to conduct a drought risk assessment for a drought period that lasts five consecutive years.

Water supply
reliability
assessment
n/a Section 6.5.2
x x Section 7.3 10635(b)(2) Include a determination of the reliability of each source of supply under a variety of water shortage conditions.

Water supply
reliability
assessment
DWR Table 7-1 Section 6.2
Table 6-2
Table 6-3
x x Section 7.3 10635(b)(3) Include a comparison of the total water supply sources available to the Supplier with the total projected water use for the drought period.

Water supply
reliability
assessment
DWR Table 7-5 Section 6.5.4
Table 6-8

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Appendix A
Urban Water Management Plan Checklist
January 2026 Page A-5
Retail
(x = required)
Wholesale
(x = required)
2025 Guidebook
Location
Water Code
Section
Summary as Applies to UWMP Subject Relevant
Submittal Table
2025
UWMP
Location
x x Section 7.3 10635(b)(4) Include considerations of the historical drought hydrology, plausible changes on projected supplies and demands under climate change conditions, anticipated regulatory changes, and other locally applicable criteria.

Water supply
reliability
assessment
n/a Section 6.2
Section 3.3
x x Chapter 8 10632(a) Provide a water shortage contingency plan (WSCP) with specified elements below. Water shortage contingency
planning
n/a Section 7

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Appendix A
Urban Water Management Plan Checklist
January 2026 Page A-6
Retail
(x = required)
Wholesale
(x = required)
2025 Guidebook
Location
Water Code
Section
Summary as Applies to UWMP Subject Relevant
Submittal
Table
2025
UWMP
Location
x x Chapter 8 10632(a)(1) Provide an analysis of water supply reliability (from Guidebook Chapter 7) in the WSCP. Water shortage contingency planning
n/a Section 7.1.1
x x Section 8.2 10632(a)(2)(A) Provide the written decision-making process and other methods that the Supplier will use each year to determine its water reliability.

Water shortage
contingency planning
n/a Section 7.2
x x Section 8.2 10632(a)(2)(B) Provide data and methodology to evaluate the Supplier’s water reliability for the current year and one dry year pursuant to factors in the code.

Water shortage
contingency planning
n/a Section 7.3
x x Section 8.3 10632(a)(3)(A) Define six standard water shortage levels of 10%, 20%, 30%, 40%, 50% shortage, and greater than 50% shortage. These levels shall be based on supply conditions, including percent reductions in supply, changes in groundwater levels, changes in surface elevation, or other conditions. The shortage levels shall also apply to a catastrophic interruption of supply.

Water shortage
contingency planning
n/a Section 7.3
x x Section 8.3 10632(a)(3)(B) Suppliers with an existing WSCP that uses different water shortage levels must cross reference their categories with the six standard categories.

Water shortage
contingency planning
DWR Table 8-1 Section 7.3
Table 7-1
x x Section 8.4 10632(a)(4)(A) Suppliers with WSCPs that align with the defined shortage levels must specify locally appropriate supply augmentation actions.

Water shortage
contingency planning
DWR Table 8-2 Section 7.4.2
Table 7-4
x x Section 8.4 10632(a)(4)(B) Specify locally appropriate demand reduction actions to adequately respond to shortages. Water shortage contingency planning
DWR Table 8-3 Section 7.4.1
Table 7-3
x x Section 8.4 10632(a)(4)(C) Specify locally appropriate operational changes. Water shortage contingency planning
DWR Table 8-2 Section 7.4.2
Table 7-4
x x Section 8.4 10632(a)(4)(D) Specify additional mandatory prohibitions against specific water use practices that are in addition to State-mandated prohibitions are appropriate to local conditions.

Water shortage
contingency planning
DWR Table 8-3 Section 7.4.1
Table 7-3
x x Section 8.4 10632(a)(4)(E) Estimate the extent to which the gap between supplies and demand will be reduced by implementation of the action.

Water shortage
contingency planning
DWR Table 8-2
DWR Table 8-3
Section 7.4.2
Table 7-4
Section 7.4.1
Table 7-3
x x Section 8.4.6 10632.5 The UWMP shall include a seismic risk assessment and mitigation plan. Water shortage contingency plan
n/a Section 7.6
x x Section 8.5 10632(a)(5)(A) Suppliers must describe that they will inform customers, the public and others regarding any current or predicted water shortages.

Water shortage
contingency planning
n/a Section 7.7
x x Section 8.5 10632(a)(5)(B),
10632(a)(5)(C)
Suppliers must describe that they will inform customers, the public and others regarding any shortage response actions triggered or anticipated to be triggered and other relevant communications.

Water shortage
contingency planning
n/a Section 7.7
x n/a Section 8.6 10632(a)(6) Retail Supplier must describe how it will ensure compliance with and enforce provisions of the WSCP.

Water shortage
contingency planning
n/a Section 7.8
x x Section 8.7 10632(a)(7)(A) Describe the legal authority that empowers the Supplier to enforce shortage response actions. Water shortage contingency planning
n/a Section 7.9
x x Section 8.7 10632(a)(7)(B) Provide a statement that the Supplier will declare a water shortage emergency per Water Code Chapter 3. Water Shortage Emergencies.

Water shortage
contingency planning
n/a Section 7.9
x x Section 8.7 10632(a)(7)(C) Provide a statement that the Supplier will coordinate with any city or county within which it provides water for the possible proclamation of a local emergency.

Water shortage
contingency planning
n/a Section 7.9
x x Section 8.8 10632(a)(8)(A) Describe the potential revenue reductions and expense increases associated with activated shortage response actions.

Water shortage
contingency planning
n/a Section 7.10
x x Section 8.8 10632(a)(8)(B) Provide a description of mitigation actions needed to address revenue reductions and expense increases associated with activated shortage response actions.

Water shortage
contingency planning
n/a Section 7.10
x n/a Section 8.8 10632(a)(8)(C) Retail Suppliers must describe the cost of compliance with Water Code Chapter 3.3, Excessive Residential Water Use During Drought.

Water shortage
contingency planning
n/a Section 7.10

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Appendix A
Urban Water Management Plan Checklist
January 2026 Page A-7
Retail
(x = required)
Wholesale
(x = required)
2025 Guidebook
Location
Water Code
Section
Summary as Applies to UWMP Subject Relevant
Submittal Table
2025
UWMP
Location
x n/a Section 8.9 10632(a)(9) Retail Suppliers must describe the monitoring and reporting requirements and procedures that ensure appropriate data are collected, tracked, and analyzed for purposes of monitoring customer compliance.

Water shortage
contingency
planning
n/a Section 7.11
x x Section 8.10 10632(a)(10) Describe reevaluation and improvement procedures for monitoring and evaluation the WSCP to ensure risk tolerance is adequate and appropriate water shortage mitigation strategies are implemented.

Water shortage
contingency
planning
n/a Section 7.12
x n/a Section 8.11 10632(b) Analyze and define water features that are artificially supplied with water, including ponds, lakes, waterfalls, and fountains, separately from swimming pools and spas.

Water shortage
contingency
planning
n/a Section 7.4.3
x x Section 8.12 10632(c) Make available the WSCP to customers and any city or county where it provides water within 30 days after adoption of the plan.

Water shortage
contingency
planning
n/a Section 7.12
x n/a Sections 9.1 10631(e)(1) Retail Suppliers shall provide a description of the nature and extent of each demand management measure implemented over the past five years. The description will address specific measures listed in code.

Demand
management
measures
n/a Section 8.1
Table 8-1
n/a x Sections 9.2 10631(e)(2) Wholesale Suppliers shall describe specific demand management measures listed in code, their distribution system asset management program, and Supplier assistance program.

Demand
management
measures
n/a n/a
x n/a Chapter 10 10608.26(a) Retail Suppliers shall conduct a public hearing to discuss adoption, implementation, and economic impact of water use targets (recommended to discuss compliance).

Plan adoption,
submittal, and
implementation
n/a Section 9.2
x x Section 10.2.1 10621(b) Notify, at least 60 days prior to the public hearing, any city or county within which the Supplier provides water that the Supplier will be reviewing the UWMP and considering amendments or changes to the plan.

Plan adoption,
submittal, and
implementation
DWR Table 10-1 Section 9.3
Table 9-1
x x Section 10.4 10621(f) Each urban water Supplier shall update and submit its 2025 plan to DWR by July 1, 2026. Plan adoption, submittal, and
implementation
n/a Section 9.4
x x Sections 10.2.2,

10.3, and 10.5
10642 Provide supporting documentation that the Supplier made the UWMP and WSCP available for public inspection, published notice of the public hearing, and held a public hearing about the UWMP and WSCP.

Plan adoption,
submittal, and
implementation
n/a Section 9.3
Section 9.4
x x Section 10.2.2 10642 The Supplier is to provide the time and place of the hearing to any city or county within which the Supplier provides water.

Plan adoption,
submittal, and
implementation
DWR Table 10-1 Section 9.3
Table 9-1
x x Section 10.3.2 10642 Provide supporting documentation that the UWMP and WSCP has been adopted as prepared or modified.

Plan adoption,
submittal, and
implementation
n/a Section 9.4
x x Section 10.4 10644(a) Provide supporting documentation that the Supplier has submitted their UWMP to the California State Library.

Plan adoption,
submittal, and
implementation
n/a Section 9.4
x x Section 10.4 10644(a)(1) Provide supporting documentation that the Supplier has submitted their UWMP to any city or county within which the Supplier provides water no later than 30 days after adoption.

Plan adoption,
submittal, and
implementation
n/a Section 9.3
x x Sections 10.4.1 and

10.4.2 10644(a)(2) The UWMP, or amendments to the UWMP, submitted to DWR shall be submitted electronically. Plan adoption, submittal, and
implementation
n/a Section 9.4
x x Section 10.7.2 10644(b) If revised, submit a copy of the WSCP to DWR within 30 days of adoption. Plan adoption, submittal, and
implementation
n/a Section 9.6

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Appendix A
Urban Water Management Plan Checklist
January 2026 Page A-8
Retail
(x = required)
Wholesale
(x = required)
2025 Guidebook
Location
Water Code
Section
Summary as Applies to UWMP Subject Relevant
Submittal
Table
2025
UWMP
Location
x x Section 10.5 10645(a) Provide supporting documentation that, not later than 30 days after filing a copy of its UWMP with DWR, the Supplier has or will make the plan available for public review during normal business hours.

Plan adoption,
submittal, and
implementation
n/a Section 9.3
x x Section 10.5 10645(b) Provide supporting documentation that, not later than 30 days after filing a copy of its WSCP with DWR, the Supplier has or will make the plan available for public review during normal business hours.

Plan adoption,
submittal, and
implementation
n/a Section 7.12.2
x x Section 10.6 10621(c) If Supplier is regulated by the Public Utilities Commission, include its plan and contingency plan as part of its general rate case filings.

Plan adoption,
submittal, and
implementation
n/a n/a

Page 1105 of 1460 ends

2025 Urban Water Management Plan
B
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.

Appendix B: Documentation of City/County
Notification

Page 1106 of 1460 ends

2025 Urban Water Management Plan Appendix B
B
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.

This page intentionally left blank.

Page 1107 of 1460 ends

PUBLIC WORKS DEPARTMENT
2201 ELKINS Way, Brentwood, CA 94513
Phone 925.516.6000 Fax 925.516.6001
www.brentwoodca.gov
March 16, 2026
Dina Breitstein, General Manager
Town of Discovery Bay
1800 Willow Lake Road
Discovery Bay, CA 94505
Re: Notification of Preparation of Urban Water Management Plan – 2025 Update Dear Ms. Breitstein:

The City of Brentwood is currently in the process of updating its Urban Water Management Plan (UWMP) and Water Shortage Contingency Plan, which were last prepared in 2020. The Urban Water Management Planning Act requires every urban water supplier providing water for municipal purposes either directly or indirectly to more than 3,000 customers or supplying more than 3,000 acre-feet of water annually to prepare and adopt an UWMP and periodically update that plan at least every five years. The UWMP is a planning document and a source document which reports, describes and evaluates water deliveries and uses, water supply sources and conservation efforts.

The City also plans on appending its 2025 UWMP to report reduced Delta reliance consistent with Delta Plan Policy WR P1.

As an urban water supplier, the City coordinates with water management agencies, relevant public agencies and other water suppliers on the preparation of the UWMP update. The City will be reviewing the UWMP and will make amendments and updates as appropriate.

If you wish to contact the City about the UWMP update, please direct any questions to James Wolfe, Water Operations Manager, at (925) 516‑6025 or [email protected].

Sincerely,
Casey Wichert
Director of Public Works

Page 1108 of 1460 ends

PUBLIC WORKS DEPARTMENT
2201 ELKINS Way, Brentwood, CA 94513
Phone 925.516.6000 Fax 925.516.6001
www.brentwoodca.gov
March 16, 2026
Aaron Trott, General Manager
East Contra Costa Irrigation District
1711 Sellers Ave
Brentwood, CA 94513
Re: Notification of Preparation of Urban Water Management Plan – 2025 Update Dear Mr. Trott:

The City also plans on appending its 2025 UWMP to report reduced Delta reliance consistent with Delta Plan Policy WR P1.

If you wish to contact the City about the UWMP update, please direct any questions to James Wolfe, Water Operations Manager, at (925) 516‑6025 or [email protected].

Sincerely,
Casey Wichert
Director of Public Works

Page 1109 of 1460 ends

PUBLIC WORKS DEPARTMENT
2201 ELKINS Way, Brentwood, CA 94513
Phone 925.516.6000 Fax 925.516.6001
www.brentwoodca.gov
March 16, 2026
Edwin Pattison, General Manager
Byron Bethany Irrigation District
7995 Bruns Rd.

Byron, CA 94514
Re: Notification of Preparation of Urban Water Management Plan – 2025 Update Dear Mr. Pattison:

The City also plans on appending its 2025 UWMP to report reduced Delta reliance consistent with Delta Plan Policy WR P1.

If you wish to contact the City about the UWMP update, please direct any questions to James Wolfe, Water Operations Manager, at (925) 516‑6025 or [email protected].

Sincerely,
Casey Wichert
Director of Public Works

Page 1110 of 1460 ends

PUBLIC WORKS DEPARTMENT
2201 ELKINS Way, Brentwood, CA 94513
Phone 925.516.6000 Fax 925.516.6001
www.brentwoodca.gov
March 16, 2026
Maggie Dutton
Contra Costa Water District
1331 Concord Ave
Concord, CA 94520
Re: Notification of Preparation of Urban Water Management Plan – 2025 Update Dear Ms. Dutton:

The City also plans on appending its 2025 UWMP to report reduced Delta reliance consistent with Delta Plan Policy WR P1.

If you wish to contact the City about the UWMP update, please direct any questions to James Wolfe, Water Operations Manager, at (925) 516‑6025 or [email protected].

Sincerely,
Casey Wichert
Director of Public Works

Page 1111 of 1460 ends

PUBLIC WORKS DEPARTMENT
2201 ELKINS Way, Brentwood, CA 94513
Phone 925.516.6000 Fax 925.516.6001
www.brentwoodca.gov
March 16, 2026
Dan Muelrath, General Manager
Diablo Water District
87 Carol Lane
Oakley, CA 94561
Re: Notification of Preparation of Urban Water Management Plan – 2025 Update Dear Mr. Muelrath:

The City also plans on appending its 2025 UWMP to report reduced Delta reliance consistent with Delta Plan Policy WR P1.

If you wish to contact the City about the UWMP update, please direct any questions to James Wolfe, Water Operations Manager, at (925) 516‑6025 or [email protected].

Sincerely,
Casey Wichert
Director of Public Works

Page 1112 of 1460 ends

PUBLIC WORKS DEPARTMENT
2201 ELKINS Way, Brentwood, CA 94513
Phone 925.516.6000 Fax 925.516.6001
www.brentwoodca.gov
March 16, 2026
Scott Buenting, Public Works Director/City Engineer
City of Antioch
200 H Street
Antioch, CA 94531
Re: Notification of Preparation of Urban Water Management Plan – 2025 Update Dear Mr. Buenting:

The City also plans on appending its 2025 UWMP to report reduced Delta reliance consistent with Delta Plan Policy WR P1.

If you wish to contact the City about the UWMP update, please direct any questions to James Wolfe, Water Operations Manager, at (925) 516‑6025 or [email protected].

Sincerely,
Casey Wichert
Director of Public Works

Page 1113 of 1460 ends

PUBLIC WORKS DEPARTMENT
2201 ELKINS Way, Brentwood, CA 94513
Phone 925.516.6000 Fax 925.516.6001
www.brentwoodca.gov
March 16, 2026
Diane Burgis
Supervisor, District 3
3361 Walnut Blvd, Suite 140
Brentwood, CA 94513
Re: Notification of Preparation of Urban Water Management Plan – 2025 Update Dear Ms. Burgis:

The City also plans on appending its 2025 UWMP to report reduced Delta reliance consistent with Delta Plan Policy WR P1.

If you wish to contact the City about the UWMP update, please direct any questions to James Wolfe, Water Operations Manager, at (925) 516‑6025 or [email protected].

Sincerely,
Casey Wichert
Director of Public Works

Page 1114 of 1460 ends

Page 1115 of 1460 ends

2025 Urban Water Management Plan
C
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.

Appendix C: Distribution System Water Loss Audit

Page 1116 of 1460 ends

2025 Urban Water Management Plan Appendix C
C
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.

This page intentionally left blank.

Page 1117 of 1460 ends

Water Audit Report for:

Reporting Year:

All volumes to be entered as: MILLION GALLONS (US) PER YEAR Master Meter and Supply Error Adjustments
WATER SUPPLIED Pcnt: Value:

Volume from own sources: 5 2,770.983 MG/Yr 3 MG/Yr
Water imported: 5 1,058.760 MG/Yr 9 MG/Yr
Water exported: n/a 0.000 MG/Yr 3 MG/Yr
Enter negative % or value for under-registration
WATER SUPPLIED: 3,829.743 MG/Yr Enter positive % or value for over-registration .

AUTHORIZED CONSUMPTION
Billed metered: 5 3,487.510 MG/Yr
Billed unmetered: n/a MG/Yr
Unbilled metered: n/a MG/Yr Pcnt: Value:

Unbilled unmetered: 5 9.570 MG/Yr 1.25% 24061 MG/Yr
AUTHORIZED CONSUMPTION: 3,497.080 MG/Yr
WATER LOSSES (Water Supplied - Authorized Consumption) 332.663 MG/Yr Apparent Losses Pcnt: Value:

Unauthorized consumption: 9.574 MG/Yr 0.25% MG/Yr
Customer metering inaccuracies: 3 71.174 MG/Yr 2.00% MG/Yr Systematic data handling errors: 5 8.719 MG/Yr 0.25% MG/Yr Apparent Losses: 89.467 MG/Yr
Real Losses (Current Annual Real Losses or CARL)
Real Losses = Water Losses - Apparent Losses: 243.196 MG/Yr WATER LOSSES: 332.663 MG/Yr

NON-REVENUE WATER
NON-REVENUE WATER: 342.233 MG/Yr
= Water Losses + Unbilled Metered + Unbilled Unmetered

SYSTEM DATA
Length of mains: 9 347.0 miles
Number of active AND inactive service connections: 9 27,224 Service connection density: 78 conn./mile main
Yes
Average length of customer service line: 5 ft
Average operating pressure: 5 64.5 psi

COST DATA
Total annual cost of operating water system: 10 $14,489,353 $/Year Customer retail unit cost (applied to Apparent Losses): 9 $4.75 Variable production cost (applied to Real Losses): 5 $3,470.00 $/Million gallons WATER AUDIT DATA VALIDITY SCORE:

PRIORITY AREAS FOR ATTENTION:
1: Volume from own sources
2: Customer metering inaccuracies
3: Billed metered
AWWA Free Water Audit Software:

Reporting Worksheet

9.570
2020 1/2020 - 12/2020
City of Brentwood (CA0710004)
<----------- Enter grading in column 'E' and 'J' ----------> Based on the information provided, audit accuracy can be improved by addressing the following components:
$/1000 gallons (US)
Default option selected for unauthorized consumption - a grading of 5 is applied but not displayed *** YOUR SCORE IS: 58 out of 100 ***
A weighted scale for the components of consumption and water loss is included in the calculation of the Water Audit Data Validity Score Default option selected for Systematic data handling errors - a grading of 5 is applied but not displayed Average length of customer service line has been set to zero and a data grading score of 10 has been applied Are customer meters typically located at the curbstop or property line? ?
?
?
?
?
? Click to access definition
?
?
?
?
?
?
Please enter data in the white cells below. Where available, metered values should be used; if metered values are unavailable please estimate a value. Indicate your confidence in the accuracy of the input data by grading each component (n/a or 1-10) using the drop-down list to the left of the input cell. Hover the mouse over the cell to obtain a description of the grades ?
?
?
?
?
?
(length of service line, beyond the property
boundary, that is the responsibility of the utility)
Use buttons to select
percentage of water
supplied
OR
value
Click here: ?
for help using option
buttons below
?
?
?
?
+
+ Click to add a comment
WAS v5.0
+
+
+
+
+
+
American Water Works Association.

Copyright © 2014, All Rights Reserved.
?
?
?
+
+
+
+
+
+
+
+
+
+
+
+
+ Use Customer Retail Unit Cost to value real losses
?
To select the correct data grading for each input, determine the highest grade where the utility meets or exceeds all criteria for that grade and all grades below it.

AWWA Free Water Audit Software v5.0 Reporting Worksheet 1

Page 1118 of 1460 ends

Water Audit Report for:

Reporting Year:

All volumes to be entered as: MILLION GALLONS (US) PER YEAR Master Meter and Supply Error Adjustments
WATER SUPPLIED Pcnt: Value:

Volume from own sources: 5 3,426.935 MG/Yr 3 MG/Yr
Water imported: 5 316.060 MG/Yr 8 MG/Yr
Water exported: n/a 0.000 MG/Yr 3 MG/Yr
Enter negative % or value for under-registration
WATER SUPPLIED: 3,742.995 MG/Yr Enter positive % or value for over-registration .

AUTHORIZED CONSUMPTION
Billed metered: 5 3,231.050 MG/Yr
Billed unmetered: n/a MG/Yr
Unbilled metered: n/a MG/Yr Pcnt: Value:

Unbilled unmetered: 5 9.357 MG/Yr 1.25% 24061 MG/Yr
AUTHORIZED CONSUMPTION: 3,240.407 MG/Yr
WATER LOSSES (Water Supplied - Authorized Consumption) 502.588 MG/Yr Apparent Losses Pcnt: Value:

Unauthorized consumption: 9.357 MG/Yr 0.25% MG/Yr
Customer metering inaccuracies: 3 65.940 MG/Yr 2.00% MG/Yr Systematic data handling errors: 5 8.078 MG/Yr 0.25% MG/Yr Apparent Losses: 83.375 MG/Yr
Real Losses (Current Annual Real Losses or CARL)
Real Losses = Water Losses - Apparent Losses: 419.213 MG/Yr WATER LOSSES: 502.588 MG/Yr

NON-REVENUE WATER
NON-REVENUE WATER: 511.945 MG/Yr
= Water Losses + Unbilled Metered + Unbilled Unmetered

SYSTEM DATA
Length of mains: 9 352.0 miles
Number of active AND inactive service connections: 9 26,747 Service connection density: 76 conn./mile main
Yes
Average length of customer service line: 5 ft
Average operating pressure: 5 64.5 psi

COST DATA
Total annual cost of operating water system: 10 $22,633,395 $/Year Customer retail unit cost (applied to Apparent Losses): 9 $7.60 Variable production cost (applied to Real Losses): 4 $2,734.24 $/Million gallons WATER AUDIT DATA VALIDITY SCORE:

PRIORITY AREAS FOR ATTENTION:
1: Volume from own sources
2: Customer metering inaccuracies
3: Billed metered
AWWA Free Water Audit Software:

Reporting Worksheet

9.357
2021 1/2021 - 12/2021
City of Brentwood (CA0710004)
<----------- Enter grading in column 'E' and 'J' ----------> Based on the information provided, audit accuracy can be improved by addressing the following components:
$/1000 gallons (US)
Default option selected for unauthorized consumption - a grading of 5 is applied but not displayed *** YOUR SCORE IS: 57 out of 100 ***
A weighted scale for the components of consumption and water loss is included in the calculation of the Water Audit Data Validity Score Default option selected for Systematic data handling errors - a grading of 5 is applied but not displayed Average length of customer service line has been set to zero and a data grading score of 10 has been applied Are customer meters typically located at the curbstop or property line? ?
?
?
?
?
? Click to access definition
?
?
?
?
?
?
Please enter data in the white cells below. Where available, metered values should be used; if metered values are unavailable please estimate a value. Indicate your confidence in the accuracy of the input data by grading each component (n/a or 1-10) using the drop-down list to the left of the input cell. Hover the mouse over the cell to obtain a description of the grades ?
?
?
?
?
?
(length of service line, beyond the property
boundary, that is the responsibility of the utility)
Use buttons to select
percentage of water
supplied
OR
value
Click here: ?
for help using option
buttons below
?
?
?
?
+
+ Click to add a comment
WAS v5.0
+
+
+
+
+
+
American Water Works Association.

AWWA Free Water Audit Software v5.0 Reporting Worksheet 1

Page 1119 of 1460 ends

Water Audit Report for:

Audit Year:

All volumes to be entered as: MILLION GALLONS (US) PER YEAR WATER SUPPLIED choose entry option:

VOS Volume from Own Sources: n g 7 2,754.468 MG/Yr n g 8 volume MG/Yr under-registration VOSEA WI Water Imported: n g 6 847.465 MG/Yr n g 5 percent MG/Yr select….. WIEA WE Water Exported: n g n/a 0.000 MG/Yr n g n/a percent MG/Yr select….. WEEA 3,601.933 MG/Yr
.

AUTHORIZED CONSUMPTION
BMAC Billed Metered: n g 8 3,147.943 MG/Yr
BUAC Billed Unmetered: n g n/a 0.000 MG/Yr
UMAC Unbilled Metered: n g n/a 0.000 MG/Yr choose entry option:

UUAC Unbilled Unmetered: n g 3 7.870 MG/Yr 0.25% default MG/Yr 24061 Default option selected for Unbilled Unmetered, with automatic data grading of 3 3,155.813 MG/Yr
WATER LOSSES 446.120 MG/Yr
Apparent Losses
Default option selected for Systematic Data Handling Errors, with automatic data grading of 3 choose entry option:

SDHE Systematic Data Handling Errors: n g 3 7.870 MG/Yr 0.25% default MG/Yr CMI Customer Metering Inaccuracies: n g 7 64.244 MG/Yr 2.00% percent MG/Yr under-registration UC Unauthorized Consumption: n g 3 7.870 MG/Yr 0.25% default MG/Yr Default option selected for Unauthorized Consumption, with automatic data grading of 3

79.983 MG/Yr
Real Losses
366.136 MG/Yr
446.120 MG/Yr

NON-REVENUE WATER
453.990 MG/Yr

SYSTEM DATA
Lm Length of mains: n g 10 354.0 miles (including fire hydrant lead lengths) Nc Number of service connections: n g 8 29,231 (active and inactive) Service connection density: 83 conn./mile main
Yes
Lp Average length of (private) customer service line: n g 10 ft (average distance between property line and meter) AOP Average Operating Pressure: n g 8 64.5 psi

COST DATA
CRUC Customer Retail Unit Charge: n g 9 $7.15
VPC Variable Production Cost: n g 3 $3,282.81 $/Million gallons $/yr (optional input) WATER AUDIT DATA VALIDITY TIER:
go to
dashboard
PRIORITY AREAS FOR ATTENTION TO IMPROVE DATA VALIDITY: KEY PERFORMANCE INDICATOR TARGETS:

Based on the information provided, audit reliability can be most improved by addressing the following components: OPTIONAL: If targets exist for the operational performance indicators, they can be input below:
1: Volume from Own Sources (VOS) Unit Total Losses: gal/conn/day 2: Variable Production Cost (VPC) Unit Apparent Losses: gal/conn/day 3: Billed Metered (BMAC) Unit Real LossesA
: gal/conn/day
Unit Real LossesB: gal/mile/day
If entered above by user, targets will display on KPI gauges (see Dashboard) Are customer meters typically located at the curbstop/property line? AWWA Free Water Audit Software:

Worksheet
City of Brentwood
Jan 01 2022 - Dec 31 2022
Water Supplied Error Adjustments
2022 Calendar
Real Losses:

WATER LOSSES:

Average length of customer service line has been set to zero and a data grading of 10 has been applied A weighted scale for the components of supply, consumption and water loss is included in the calculation of the Water Audit Data Validity Score *** The Water Audit Data Validity Score is in Tier III (51-70). See Dashboard tab for additional outputs. *** $/1000 gallons (US)
$14,499,193
Total Annual Operating Cost
go to start page
NON-REVENUE WATER:

If entering an
Error Adjustment,
select under- or overregistration
WATER SUPPLIED:

AUTHORIZED CONSUMPTION:

Apparent Losses:

Click 'g' to determine data validity grade
Click 'n' to add notes
FWAS v6.0
American Water Works Association.

To access definitions, click the input name
To edit water system info:

AWWA Free Water Audit Software v6.0 Worksheet 1

Page 1120 of 1460 ends

Water Audit Report for:

Audit Year:

All volumes to be entered as: MILLION GALLONS (US) PER YEAR WATER SUPPLIED choose entry option:

VOS Volume from Own Sources: n g 7 2,842.342 MG/Yr n g 8 volume MG/Yr under-registration VOSEA WI Water Imported: n g 7 514.000 MG/Yr n g 9 percent MG/Yr over-registration WIEA WE Water Exported: n g n/a 0.000 MG/Yr n g n/a percent MG/Yr select….. WEEA 3,390.126 MG/Yr
.

AUTHORIZED CONSUMPTION
BMAC Billed Metered: n g 8 2,952.631 MG/Yr
BUAC Billed Unmetered: n g n/a MG/Yr
UMAC Unbilled Metered: n g n/a MG/Yr choose entry option:

UUAC Unbilled Unmetered: n g 3 7.382 MG/Yr 0.25% default MG/Yr 24061 Default option selected for Unbilled Unmetered, with automatic data grading of 3 2,960.013 MG/Yr
WATER LOSSES 430.113 MG/Yr
Apparent Losses
Default option selected for Systematic Data Handling Errors, with automatic data grading of 3 choose entry option:

SDHE Systematic Data Handling Errors: n g 3 7.382 MG/Yr 0.25% default MG/Yr CMI Customer Metering Inaccuracies: n g 2 60.258 MG/Yr 2.00% percent MG/Yr under-registration UC Unauthorized Consumption: n g 3 7.382 MG/Yr 0.25% default MG/Yr Default option selected for Unauthorized Consumption, with automatic data grading of 3

75.021 MG/Yr
Real Losses
355.092 MG/Yr
430.113 MG/Yr

NON-REVENUE WATER
437.495 MG/Yr

SYSTEM DATA
Lm Length of mains: n g 10 356.0 miles (including fire hydrant lead lengths) Nc Number of service connections: n g 10 28,763 (active and inactive) Service connection density: 81 conn./mile main
Yes
Lp Average length of (private) customer service line: n g 10 ft (average distance between property line and meter) AOP Average Operating Pressure: n g 8 64.5 psi

COST DATA
CRUC Customer Retail Unit Charge: n g 10 $7.33
VPC Variable Production Cost: n g 10 $2,606.71 $/Million gallons $/yr (optional input) WATER AUDIT DATA VALIDITY TIER:
go to
dashboard
PRIORITY AREAS FOR ATTENTION TO IMPROVE DATA VALIDITY: KEY PERFORMANCE INDICATOR TARGETS:

Based on the information provided, audit reliability can be most improved by addressing the following components: OPTIONAL: If targets exist for the operational performance indicators, they can be input below:
1: Volume from Own Sources (VOS) Unit Total Losses: gal/conn/day 2: Customer Metering Inaccuracies (CMI) Unit Apparent Losses: gal/conn/day 3: Billed Metered (BMAC) Unit Real LossesA
: gal/conn/day
Unit Real LossesB: gal/mile/day
If entered above by user, targets will display on KPI gauges (see Dashboard) Are customer meters typically located at the curbstop/property line? AWWA Free Water Audit Software:

Worksheet

1.716
City of Brentwood

33.784
Jan 01 2023 - Dec 31 2023
Water Supplied Error Adjustments
2023 Calendar
Real Losses:

WATER LOSSES:

Average length of customer service line has been set to zero and a data grading of 10 has been applied A weighted scale for the components of supply, consumption and water loss is included in the calculation of the Water Audit Data Validity Score *** The Water Audit Data Validity Score is in Tier IV (71-90). See Dashboard tab for additional outputs. *** $/1000 gallons (US)
$16,875,092
Total Annual Operating Cost
go to start page
NON-REVENUE WATER:

If entering an
Error Adjustment,
select under- or overregistration
WATER SUPPLIED:

AUTHORIZED CONSUMPTION:

Apparent Losses:

Click 'g' to determine data validity grade
Click 'n' to add notes
FWAS v6.0
American Water Works Association.

To access definitions, click the input name
To edit water system info:

AWWA Free Water Audit Software v6.0 Worksheet 1

Page 1121 of 1460 ends

Water Audit Report for:

Audit Year:

All volumes to be entered as: MILLION GALLONS (US) PER YEAR WATER SUPPLIED choose entry option:

VOS Volume from Own Sources: n g 7 2,996.009 MG/Yr n g 8 percent MG/Yr under-registration VOSEA WI Water Imported: n g 7 570.451 MG/Yr n g 9 percent MG/Yr select….. WIEA WE Water Exported: n g n/a 0.000 MG/Yr n g n/a percent MG/Yr select….. WEEA 3,566.460 MG/Yr
.

AUTHORIZED CONSUMPTION
BMAC Billed Metered: n g 8 3,122.517 MG/Yr
BUAC Billed Unmetered: n g n/a MG/Yr
UMAC Unbilled Metered: n g 2 7.776 MG/Yr choose entry option:

UUAC Unbilled Unmetered: n g 3 7.806 MG/Yr 0.25% default MG/Yr 24061 Default option selected for Unbilled Unmetered, with automatic data grading of 3 3,138.099 MG/Yr
WATER LOSSES 428.361 MG/Yr
Apparent Losses
Default option selected for Systematic Data Handling Errors, with automatic data grading of 3 choose entry option:

SDHE Systematic Data Handling Errors: n g 3 7.806 MG/Yr 0.25% default MG/Yr CMI Customer Metering Inaccuracies: n g 2 63.884 MG/Yr 2.00% percent MG/Yr under-registration UC Unauthorized Consumption: n g 3 7.806 MG/Yr 0.25% default MG/Yr Default option selected for Unauthorized Consumption, with automatic data grading of 3

79.496 MG/Yr
Real Losses
348.865 MG/Yr
428.361 MG/Yr

NON-REVENUE WATER
443.943 MG/Yr

SYSTEM DATA
Lm Length of mains: n g 10 358.9 miles (including fire hydrant lead lengths) Nc Number of service connections: n g 8 32,928 (active and inactive) Service connection density: 92 conn./mile main
Yes
Lp Average length of (private) customer service line: n g 10 ft (average distance between property line and meter) AOP Average Operating Pressure: n g 9 64.5 psi

COST DATA
CRUC Customer Retail Unit Charge: n g 10 $7.43
VPC Variable Production Cost: n g 10 $5,325.06 $/Million gallons $/yr (optional input) WATER AUDIT DATA VALIDITY TIER:
go to
dashboard
PRIORITY AREAS FOR ATTENTION TO IMPROVE DATA VALIDITY: KEY PERFORMANCE INDICATOR TARGETS:

Based on the information provided, audit reliability can be most improved by addressing the following components: OPTIONAL: If targets exist for the operational performance indicators, they can be input below:
1: Volume from Own Sources (VOS) Unit Total Losses: 32.8 gal/conn/day 2: Customer Metering Inaccuracies (CMI) Unit Apparent Losses: 8.5 gal/conn/day 3: Billed Metered (BMAC) Unit Real LossesA
: 24.3 gal/conn/day
Unit Real LossesB: gal/mile/day
If entered above by user, targets will display on KPI gauges (see Dashboard) Are customer meters typically located at the curbstop/property line? AWWA Free Water Audit Software:

Worksheet

8.182
City of Brentwood
Jan 01 2024 - Dec 31 2024
Water Supplied Error Adjustments
2024 Calendar
Real Losses:

WATER LOSSES:

Average length of customer service line has been set to zero and a data grading of 10 has been applied A weighted scale for the components of supply, consumption and water loss is included in the calculation of the Water Audit Data Validity Score *** The Water Audit Data Validity Score is in Tier IV (71-90). See Dashboard tab for additional outputs. *** $/1000 gallons (US)
$21,573,322
Total Annual Operating Cost
go to start page
NON-REVENUE WATER:

If entering an
Error Adjustment,
select under- or overregistration
WATER SUPPLIED:

AUTHORIZED CONSUMPTION:

Apparent Losses:

Click 'g' to determine data validity grade
Click 'n' to add notes
FWAS v6.0
American Water Works Association.

To access definitions, click the input name
To edit water system info:

AWWA Free Water Audit Software v6.0 Worksheet 1

Page 1122 of 1460 ends

This page intentionally left blank.

Page 1123 of 1460 ends

2025 Urban Water Management Plan
D
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.

Appendix D: Second Amendatory Agreement Between
CCWD and the City

Page 1124 of 1460 ends

2025 Urban Water Management Plan Appendix D
D
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.

This page intentionally left blank.

Page 1125 of 1460 ends

SECOND

AMENDATORY AGREEMENT BETWEEN

THE CONTRA COSTA WATER DISTRICT AND THE CITY OF BRENTWOOD �)�.�
This Second Amendatory Agreement is entered into this day of �,Ju , , 2009, between the Contra Costa Water District (herein referred to as "CCWD"), a c� district organized and existing under Division 12, commencing with Section 30000 of the California Water Code, and the City of Brentwood, a Mu nicipal Corporation herein referred to as "Brentwood."

1. RECITALS OF FACT
A. East Contra Costa Irrigation District ("ECCID") and the California Department of Water Resources ("DWR") entered into a January 7, 198 1 Agreement, which was amended by ECCID, DWR, and CCWD on February 7, 2000: 1) to expand the recognized water rights Los Vaqueros Service Area of ECCID to include an agreed upon portion of ECCID's 19 12 place of use, 2) to expand ECCID's points of diversion to include CCWD's intakes at Rock Slough and Old River, and 3) to increase the maximum diversion rate for ECCID's water to 250 cubic feet per second.

B. ECCID and CCWD entered into an agreement, dated May 16, 1990, wherein ECCID irrevocably dedicated 21,000 acre-feet annually (afa) of its 50,000 acre-feet confirmed annual water right to Municipal and Industrial (M&I) use, and of said 21,000 afa, sold to CCWD a permanent entitlement to use 8,000 afa (Block A), along with options on 7,000 afa (Block B) to be exercised by December 31, 1999, and 6,000 afa (Block C) to be exercised by December 31, 2009.

C. ECCID, CCWD and DWR entered into an agreement dated April 11, 199 1, and further amended that agreement on February 7, 2000, wherein it was agreed that CCWD could pump ECCID water for M&I use at its Rock Slough and Old River intakes, and could serve ECCID water within CCWD and within an area corresponding to ECCID's water right place of use.

D. CCWD and the Diablo Water District ("DWD") entered into an agreement dated June 6, 1989, wherein CCWD and DWD agreed to build and operate the Randall-Bold Water Treatment Plant and agreed to cost sharing for the project.

E. Brentwood and CCWD entered into an agreement dated October 19, 1995, whereby CCWD sold to Brentwood a permanent entitlement to use 7,000 afa of said Block A water, and whereby CCWD further agreed to negotiate with Brentwood concer ning the remaining said Blocks B and C under Section 2.i thereof, which has been fully complied with.

F. Brentwood has confirmed that it will use the 7 ,000 afa of Block A water, as specified in Section 2.c of the October 19, 1995 agreement. Said agreement was superseded by the February 7, 2000 agreement, and no longer has any force or effect.

G. ECCID and CCWD have entered into an Agreement effective January 1, 2000 which provides for the permanent entitlement of 8,200 afa to be served in CCWD and for an additional 4,000 afa to be available to CCWD in shortage periods and which provides for payments to ECCID by CCWD for the water used, and which supersedes the ECCIDCCWD agreement dated May 16, 1990.

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H. Brentwood and ECCID have entered into an Agreement dated December 14, 1999 that provides for the permanent entitlement of 14,800 afa from ECCID to Brentwood and for payments to ECCID by Brentwood for the water used.

I. It is mutually understood and agreed that the 7,000 afa of Block A water referenced withi n the October 19, 1995 Agreement is included within the total amount of water covered in the water supply agreement between Brentwood and ECCID dated December 14, 1999, and that the remainder of the 14,000 afa of Block A, B and C water is included withi n either said agreement between Brentwood and ECCID, dated December 14, 1999, or in the agreement between CCWD and ECCID, effective January 1, 2000, that supersedes and replaces the May 16, 1990 agreement.

J. Brentwood and CCWD fou nd it in their best interests to enter into an Agreement effective January 1, 2000, (the "Original Agreement") in order to provide for their long-term water supplies, to allocate costs of meeti ng those supplies, to provide the basis for a potential long-term agreement between CCWD and Brentwood for conveyance and treatment of Brentwood's water, and to resolve potential conflicts regarding service in overlappi ng service boundaries by providi ng a means by which Brentwood can lawfully serve water to customers in CCWD's territory.

K. Brentwood and CCWD found it in their best interests to enter into an Amendatory Agreement effective September 24, 2003, in order to provide for the purchase of a portion of CCWD's share of the capacity of the Randall-Bold Water Treatment Plant (and, through the Agreement between Contra Costa Water District and the City of Brentwood for Design and Construction of Water Facilities at the Randall-Bold Water Treatment Plant of even date herewith, to facilitate a more effective method for conveyance of Brentwood's water treated by the Plant), and to continue to address long-term drinki ng water supplies, treatment, and the allocation of the costs thereof, and to conti nue in place the means by which Brentwood can lawfully serve water to customers in CCWD's territory within overlappi ng service boundaries.

L. Brentwood and CCWD now fi nd it in their best interests to enter into this Second Amendatory Agreement effective on the date first set forth above, in order to i) amend portions of the agreement to recognize that certain requirements of the agreements have been successfully completed, and ii) enable the parties to reconcile, as of the date stated in paragraph 4.C.iii.c of this Second Amendatory Agreement, the payments by Brentwood of the facilities component of the wholesale municipal rate (as described in paragraph

4.C.iii.c of this Second Ame ndatory Agreement) for connections withi n the overlapping service boundaries of CCWD and Brentwood that occurred ahead of the schedule contemplated by paragraph 4.C.iii.c of the Amendatory Agreement, and, in recognition of Brentwood's adoption of the County's Urban Limit Line which has the effect of potentially reducing or significantly delayi ng the future developme nt withi n the overlapping service boundaries, to provide that payment of the facilities component of the wholesale municipal rate shall thereafter be based on the issuance of buildi ng permits as set forth in paragraph

4.C.iii.c of this Second Amendatory Agreement.

2. APPROVALS AND TRANSITION
A. This Agreement shall become effective upon execution of an Agreement between Contra Costa Water District and the City of Brentwood for Design and Construction of Water Facilities at the Randall-Bold Water Treatment Plant" of even date herewith.

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B. Until the execution of the February 7, 2000 agreement among DWR, ECCID and CCWD referenced in the recitals above), Brentwood was required to make all its payments under the October 19, 1995 Agreement to CCWD and CCWD was required to conti nue to make all payments to ECCID as specified in CCWD's agreement with ECCID. Specifically, Brentwood was required to conti nue to reimburse CCWD for the portion of CCWD's annual payments to ECCID attributable to 7,000 afa of the Block A water under the October 19, 1995 Agreement ($ 140,000 per year) and for the cost of payments to DWR of $1,540 per year for an annual total of $14 1,540 per year and Brentwood was required to make the first payment to CCWD on December 1, 1995 and on December 1 of each year thereafter until the May 16, 1990 Agreement between CCWD and ECCID was superseded and replaced by the water supply agreement between ECCID and CCWD effective January 1, 2000.

Subsequently, payments for use of water which Brentwood has agreed to purchase from ECCID shall be made as specified in the agreement between ECCID and Brentwood.

3. LONG TERM WATER SUPPLY FOR BRENTWOOD
A. Brentwood and CCWD shall equitably share the costs of CCWD's past payments required to maintai n its entitlement to the ECCID water subject to the May 16, 1990 ECCID-CCWD Agreement. The total amount Brentwood is obligated to reimburse is approximately $586,000 (64.4% of the total payments through December 31, 1999 to ECCID [$2,350,000] less annual payments by Brentwood under the October 19, 1995 Agreement for Block A less any quarterly payments on the reimbursement already made). These past entitlement payments represent a buy-down cost per acre-foot of water as stated in the ECCIDBrentwood Agreement dated December 14, 1999.

B. Nothi ng in this agreement shall be construed to change or alter any provisions of CCWD's agreements with ECCID or with ECCID and DWR.

4. TREATED WATER SERVICE TO BRENTWOOD
A. Project Description
i. CCWD shall convey and treat water obtained by Brentwood under the water supply agreement between Brentwood and ECCID dated December 14, 1999, (hereafter "Brentwood's ECCID water") at the 40 mgd Randall-Bold Water Treatment Plant (using CCWD's 25 mgd share (rather than DWD's 15 mgd share) of the capacity of that plant until Brentwood makes the payments set forth in Section 4.F.iii), at which time CCWD shall use first Brentwood's 6 mgd capacity right.; should Brentwood require more than 6 mgd duri ng the term of this interim Agreement, CCWD shall make a good faith effort to provide the necessary treatment capacity required by Brentwood, provided that provision of capacity is otherwise in conformance with this Agreement and that CCWD has the ability to provide such additional capacity and that the determi natio n of CCWD's ability to provide such capacity is made at CCWD's sole discretion. ii. Use of Brentwood's ECCID water diverted, conveyed and treated by CCWD under this Agreement shall be in accordance with all applicable terms and conditions of the December 14, 1999 Agreement between Brentwood and ECCID, and the agreement dated April 11, 199 1 among DWR, ECCID and CCWD, as amended. If either agreement has been superseded and replaced by subseque nt agreements among those parties, then Brentwood's use of ECCID water shall be in accordance with the agreements then in effect.

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iii. It is the intent of CCWD to provide treated water to Brentwood in accordance with the terms of Article 7 of the Joint Powers Agreement (JPA) dated June 6, 1989 between CCWD and DWD.
iv. Subject to Subsection 4.B and Section 5 of this Agreement, upon and following the date of delivery of treated water from CCWD to Brentwood, any and all obligations on the part of CCWD to serve Brentwood shall be as specifically stated in this Agreement and such obligations shall remain in effect unless and until this Agreement is terminated pursuant to Section 9. CCWD shall have the right to suspend deliveries of treated water should Brentwood fail to timely pay all rates and charges described in this Agreement.

B. Temporary Disr uption of Service
i. The parties recognize that CCWD may be required by operational constraints from regulatory requireme nts, emergency conditions, court order or otherwise to curtail some or all of its diversions of Brentwood's ECCID water. In such circumstances, CCWD shall provide Brentwood with as much advance written notice of any curtailments of ECCID water diversions as is practical. The notice will be directed to the City Engineer at the City of Brentwood, 708 Third Street, Brentwood, Califor nia 945 13, via U.S. mail and via telecopier. In the notice, CCWD shall inform Brentwood of the reason for curtailing the diversion, the portion of the diversion to be curtailed and the anticipated duration. In the event of an emergency threatening imminent harm to human life or property, CCWD shall notify Brentwood that the ECCID water diversions will be curtailed at the earliest possible time, and shall keep Brentwood informed of the stat us and extent of the diversions, and the expected time the diversions will be curtailed, until the emergency sit uation is resolved and regular diversion service is restored.
ii. Provision of Water during Disr uption of Services based on Connections withi n CCWD's Los Vaqueros Service Area:

In such circumstances as described in Subsection 4.B.i wherein CCWD is unable to divert some or all of Brentwood's ECCID water, CCWD shall furnish other water to Brentwood for use by Brentwood's customers in an amount equivalent to 0.67 afa per purchased equivalent connection (a typical residential connection equivalent, as defined in Exhibit 2) within CCWD's Los Vaqueros Service Area and for which Brentwood has paid applicable rates and charges as described in Section 4.C.iii. The water thus fur nished shall be in a quantity consistent with CCWD's Code of Regulations and policies with reductions proportionate to the reductions, if any, in the quantities then being fur nished to CCWD's wholesale municipal customers, and shall be consistent with the terms as described in Section 5.E. iii. Provision for Additional Water during Disruption of Services for Connections outside CCWD's Los Vaqueros Service Area:
a. Further in such circumstances as described in Section 4.B.i wherein CCWD is unable to divert some or all of Brentwood's ECCID water, CCWD may, but is not required to, agree to fur nish other water to Brentwood in addition to the water described in Subsection 4.B.ii and 5.E.i and ii up to the same total quantity that would have otherwise been diverted under this Agreement, for use by Brentwood Second Amendatory Agreement between the Contra Costa Water District and the City of Brentwood Page 4of 16

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outside of CCWD's Los Vaqueros Service Area. CCWD's right to terminate this agreement under Section 9 shall not be affected by the preceding sentence or by CCWD's agreement thereunder to furnish and treat water other than Brentwood's ECCID water.
b. If pursuant to the preceding subparagraph CCWD agrees to furnish and treat other water for Brentwood for use outside of CCWD's Los Vaqueros Service Area, Brentwood shall at its cost make available to CCWD the same quantity of water for use by CCWD. The water shall be provided at such a time and in such a location that CCWD can divert (or redivert) and convey such water directly to storage in a reservoir owned by CCWD or, at CCWD's sole discretion, directly to CCWD's customers.
iv. CCWD may temporarily reduce the quantities of water delivered, or may discontinue the delivery of water, to Brentwood to enable CCWD to perform necessary inspection, repair, or replacement of any portion of the facilities that are then used to divert, convey and treat the water confirmed for use by Brentwood. CCWD shall provide Brentwood with as much advance notice as is practicable of any such discontinuance of, or reduction in the delivery of water to Brentwood. CCWD shall not be liable for failure to deliver water to Brentwood if such failure is caused by any reason beyond the reasonable control of CCWD.

C. Reimbursements
i. General Principles
a. Rates for conveyance and treated water service shall reimburse CCWD for the actual operating, maintenance, and administrative costs of conveying the water to and from, and of treating the water at, the Randall-Bold Water Treatment Plant, and a prorated value for wear and tear of the conveyance and Treatment Plant facilities.

Reimbursable costs as set forth in Exhibit 3 shall include all actual operating, maintenance, administrative, and wear and tear of the treated water pump station described in Section 4.G.
b. Such rates for conveyance and treated water service (for the portion of water not included in the capacity which Brentwood has purchased) shall include a charge for the use of debt funded facilities (treatment at the Randall-Bold Water Treatment Plant, conveyance facilities and the occasional use of Los Vaqueros Project conveyance facilities) which shall provide compensation for interest costs, but not principal. Having purchased the capacity right separately through the lump sum payments set forth in Section 4.F.iii, Brentwood is not required to pay interest or principal for treatment of the increment of capacity (set forth in Section 4.F.i) that it has purchased at Randall-Bold Water Treatment Plant.
c. By paying such rates for conveyance and treatment of water in excess of 6 mgd or 3,200 acre-feet in any year, Brentwood will not be purchasing any capacity rights in District facilities for conveyance or treatment of water in excess of 6 mgd or 3,200 acre-feet in any year, except as described in Section 5.D herein. d. CCWD shall invoice and Brentwood shall pay for the delivery and treatment of water on a monthly basis unless other financial arrangements are made.

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ii. For raw water service for Brentwood's customers outside the Los Vaqueros Service Area of CCWD, Brentwood shall pay on a monthly basis unless other financial arrangements are made, for the following:
a. The operating, maintenance and administrative costs of diverting and delivering the water to the Randall-Bold Water Treatment Plant and a prorated value for wear and tear of facilities. These charges are exclusive of the charges set forth in Section 3 and Subsection 4.C.iii through v, and are calculated as set forth in Exhibit 1, and are subject to adjustment from time-to-time based on actual costs. b. The occasional use of Los Vaqueros Project pumping and conveyance facilities if CCWD is unable to divert ECCID water at its Rock Slough intake and these facilities are used to divert and convey the ECCID supply to the Randall-Bold Water Treatment Plant. CCWD shall attempt to minimize use of Los Vaqueros Project facilities for conveying Brentwood's ECCID water, to the extent it is consistent with CCWD's water quality goals, operational and regulatory constraints. The costs to be reimbursed for the use of Los Vaqueros Project pumping and conveyance facilities to serve water outside of the Los Vaqueros Service Area of CCWD are the prorated share of the sum of fixed operation and maintenance costs, variable operation and maintenance costs, and Los Vaqueros debt service costs for interest only, as set forth in Exhibit 1 and are subject to adjustment from time to time by CCWD's Board of Directors. Such rates shall be based upon those adopted from time-to-time and published in CCWD's Code of Regulations. iii. For water service for all Brentwood's customers within the Los Vaqueros Service Area of CCWD, Brentwood shall pay to CCWD on a monthly basis, unless another basis is indicated:
a. The full cost of service (including principal and interest costs for the use of Los Vaqueros facilities) for wholesale raw water as set forth in the wholesale municipal rate in CCWD's Code of Regulations Section 5.20.0 10, as amended from time to time by CCWD's Board of Directors, less the portion thereof associated with the cost of water obtained from the United States Bureau of Reclamation from the Central Valley Project (CVP) not used, plus the costs associated with delivery of ECCID water, as set forth in Exhibit 2. For the purposes of establishing a meter size and a water use capacity for Brentwood for such service to customers in CCWD's Los Vaqueros Service Area, the Brentwood meter size and water use capacity shall be 0.67 afa and 1,200 gpd maximum day for each actual equivalent meter connection in CCWD's Los Vaqueros Service Area.
b. For each added or enlarged meter within CCWD's Los Vaqueros Service Area, a facilities component of the wholesale municipal rate in the amount then specified in the applicable table in Section 5.20.0 1 OF of CCWD's Code of Regulations, as amended from time to time by CCWD's Board of Directors, less the portion of said component associated with the cost of future water supply, as set forth in the table in Exhibit 2 entitled "Connection Fee". This amount has been included in the City of Brentwood Development Fee Program that spreads this cost equitably among the various types of new development and will be tendered to CCWD as specified below.

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c. Brentwood agrees to pay for new equivalent meter connections within the overlap area as follows. An initial payment of $750,000 will be made by Brentwood to CCWD no later than 30 days of the effective date of this second Amendatory Agreement ("First Payment"). Within 9 months of the First Payment, CCWD will invoice and Brentwood will make a second payment to CCWD as described in Exhibit 4, attached and incorporated herein.
d. Thereafter, CCWD will invoice Brentwood annually on or about April 151 of every year, and Brentwood will pay to CCWD, the facilities component of the wholesale municipal rate as described in the preceding paragraph for the actual number of equivalent meter connections added in the preceding year. For the purpose of determining the annual payment, the parties agree to use installed equivalent meter connections plus all equivalent meter connections approved by building permits issued in the preceding year. In the event this Second Amendatory Agreement is terminated, Brentwood shall pay CCWD forthwith for all actual connections not yet paid. Brentwood shall receive the benefits described in Section 5.D and 5.E for each connection, entirely within CCWD's Los Vaqueros Service Area, for which the applicable rates and charges have been paid and continue to be paid. e. Brentwood will have the option of purchasing additional capacity in CCWD's system for service to customers outside the overlap area, provided that the total number of connections receiving the benefits of the Los Vaqueros Project under this Agreement does not exceed 4,780 equivalent meter connections. Rates and charges for such water service will be the full cost of service for inside customers as specified in Section 4.C.iii and Exhibit 2.
iv. In addition to the foregoing charges, for water treatment services under this Agreement, Brentwood shall pay to CCWD on a monthly basis, unless other financial arrangements are made, the operating, maintenance and administrative costs of treating the water at the Randall-Bold Water Treatment Plant and pumping treated water to Brentwood's distribution system. Such rates for conveyance and treated water service shall include a charge for the use of debt funded facilities (wear and tear and rental) for treatment of water in excess of 6 mgd daily or 3,200 acre-feet in any year at the Randall-Bold Water Treatment Plant, conveyance facilities and the occasional use of Los Vaqueros Project conveyance facilities, which shall provide compensation for interest costs, but not principal. By purchasing the capacity right separately through the lump sum payments set forth in Section 4.F.iii, Brentwood will not be required to pay interest or principal for treatment of water less than 6 mgd daily maximum or 3,200 acre-feet in any year at the Randall-Bold Water Treatment Plant.

Brentwood will be required to pay Randall-Bold Water Treatment Plant interest charges for treatment in excess of 6 mgd. These charges are exclusive of the charges set forth in Section 3 and Sections 4.C.ii and 4.C.iii of this Agreement, and are calculated as set forth in Exhibit 3, and shall be based on actual costs.

D. Measurement of Quantities of Water
i. The quantity of raw water conveyed under this Agreement shall be the quantity measured at the point of diversion from either CCWD's intakes at Old River, or Rock Slough or Victoria Canal, or ECCID's intake at Indian Slough or a combination thereof. ii. The quantity of water treated at the Randall Bold Water Treatment Plant for purposes Second Amendatory Agreement between the Contra Costa Water District and the City of Brentwood Page 7of 16

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of this Agreement shall be the quantity measured at the flow meter at the intertie with DWD and/or at the flow meter at the discharge side of the treated water pump station described in Section 4.G, plus plant losses as calculated in subparagraph iii. After the pump station is operational and upon written notification from Brentwood, Brentwood's water quantities will be measured solely at the pump station discharge. iii. Any water losses due to the treatment process will be apportioned annually based on Brentwood's proportion of total flow through the Randall-Bold Water Treatment Plant.

Loss in the Treatment Plant is defined as the difference between water measured at the intake meter and water measured at the effluent meter. Brentwood's portion of this loss is the ratio of the quantity measured at the intertie meter and adjusted for distribution system losses to the quantity measured at the effluent meter. Loss will be determined within sixty (60) days of the close of the fiscal year and included in the payment reconciliation called for in Section BC.

E. Water Quality
i. CCWD is solely responsible for ensuring the quality of water, and for all aspects of compliance with applicable water quality regulations and standards, up to the discharge flange of the treated water pumps described in Section 4.G. Brentwood is solely responsible for ensuring water quality, and for all aspects of compliance with applicable water quality regulations and standards downstream of this location throughout the Brentwood distribution system. Subject to the preceding provisions of this paragraph, Brentwood shall be responsible to receive and respond to communications from customers within the City of Brentwood relating to water quality concerns.

F. Brentwood acknowledges that chloramine is used in the Randall-Bold Water Treatment Plant as the residual disinfectant. Brentwood shall be fully responsible for all issues related to the mixing of treated CCWD water with other Brentwood water sources, including but not limited to dealing with all regulatory agency issues related to disinfection and disinfection by-products. Brentwood's purchase of a capacity right at Randall-Bold to serve customers in the overlapping portion of the Brentwood and CCWD service areas i. Brentwood hereby purchases and CCWD hereby sells to Brentwood the treatment capacity right to treat up to 3,200 afa of water per year at the Randall-Bold Water Treatment Plant, which became effective upon the receipt by CCWD of the payments set forth in Section 4.F.iii. The maximum daily usage of this treatment capacity right shall not exceed 6 million gallons per day (mgd). Brentwood will not own the treatment capacity or facilities in title, but will have a reserved capacity right to receive water treated at Randall-Bold Water Treatment Plant in the quantities described in this section for the life of said Plant.
ii. The capacity right will be made available to Brentwood from CCWD's share of the plant capacity as described in Section 4.A.i. It is the intent of the District to provide treated water to Brentwood in accordance with the terms of Article 7 of the Joint Powers Agreement (JPA) dated June 6, 1989 between CCWD and DWD. The District may also elect, from time to time, to deliver water to Brentwood from its Bollman Water Treatment Plant. Should treated water be delivered from the Bollman Water Treatment Plant to Brentwood, the water will be paid for as though it had been produced and delivered from the Randall-Bold Water Treatment Plant.

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iii. The cost for the 6 mgd capacity right was $10,000,000 (Ten Million Dollars), for which Brentwood has paid in full.
iv. CCWD shall be responsible for delivery of the quantity of treated water up to the discharge side of the pump station as further described in Section 4.D.ii. The parties' respective responsibilities for water quality are further described in Section 4.E.i. v. If and when capital improvements are made to the treatment processes at RandallBold Water Treatment specifically to meet state or federally mandated regulatory requirements, Brentwood shall pay its proportionate share based on its capacity rights. vi. In the event CCWD determines to make capital improvements to the treatment processes at Randall-Bold Water Treatment Brentwood shall be consulted in advance of the work and agreement will be reached as to the scope of the project, the proportionate share of costs to be allocated to Brentwood, and the timing for repayment. The key principle for reaching such an agreement is that Brentwood's share of repayment shall be proportionate to the benefits received from the improvement. Brentwood shall not be responsible for paying any costs associated with CCWD or DWD expansions that do not benefit Brentwood.

G. New Treated Water Pump Station and Pipeline at Randall-Bold Water Treatment Plant to Serve Brentwood
i. Brentwood has constructed a pump station and pipeline at the Randall-Bold site to convey treated water produced by CCWD to Brentwood's distribution system pursuant to the "Agreement between Contra Costa Water District and the City of Brentwood for Design and Construction of Water Facilities at the Randall-Bold Water Treatment Plant". The new facilities are used to convey water treated at Randall-Bold using Brentwood's capacity right as described in Section 4.F and the City of Brentwood's Water Treatment plant located on the Randall-Bold site. ii. Brentwood is responsible for all costs associated with the pump station and pipeline project and entered into an agreement with CCWD as described in Subsection 4.G.iii to specify the responsibilities of both parties during design, construction and operation of the project.
iii. As further defined in the "Agreement between Contra Costa Water District and the City of Brentwood for Design and Construction of Water Facilities at the Randall-Bold Water Treatment Plant", final inspection and acceptance of the project was conducted by Brentwood and CCWD. After final acceptance, Brentwood transferred ownership of the pump station to CCWD.
iv. Both CCWD and Brentwood agree that the primary purpose of the pump station is to provide treated potable water to Brentwood. Brentwood will be consulted by CCWD if any future modifications to this use are contemplated. If future modifications involve use of the pump station to convey water to any party other than Brentwood, the parties shall negotiate the requirements for reimbursing a portion of Brentwood's capital cost to build the facility as well as any applicable replacement, maintenance and depreciation costs. This reimbursement shall be based upon the ratio of total flow provided in gallons per minute measured at a mutually agreeable location.

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v. CCWD has provided an easement to Brentwood for maintenance of the portion of treated water pipeline built on the Randall-Bold site. The cost of the easement was determined by a property appraiser mutually agreeable to both parties. vi. Brentwood shall own and maintain the entire pipeline in perpetuity. Brentwood shall, at its sole expense, remove the pipeline if for any reason in the future it is abandoned. If the pipeline fails, leaks or breaks, Brentwood is responsible for all repair and associated costs unless said damage is due to the sole willful misconduct of CCWD.

Brentwood will be permitted access to the pipeline as well as the pump station as needed for maintenance or inspections. For security reasons, access to the RandallBold site shall be controlled by CCWD. vii. Brentwood and CCWD maintain a procedure for scheduling water deliveries that meets the needs of the parties and does not adversely impact the operations of the RandallBold Water Treatment Plant.

H. Commitments, Responsibilities and Schedule for Implementing A Long-Term Treated Water Agreement
i. Brentwood and CCWD have executed an agreement effective on September 24, 2004 (as amended) in order to define the terms of CCWD providing and Brentwood receiving treated water service for Brentwood customers outside of CCWD's Los Vaqueros service area.
ii. The long-term agreement addressed treatment of Brentwood's ECCID supply for customers outside the overlap area at a new treatment facility located on Randall-Bold property and separate from facilities that treat water for customers in the overlap area.

The new facility supplements the 6 mgd capacity right from Randall-Bold described in Section 4.F. The new treatment facility was initially sized for a 15 mgd capacity and is expandable to approximately 30 mgd. The facility consists of conventional treatment processes and utilizes a number of existing Randall-Bold support facilities including but not limited to the operations building, laboratory, power supply, roads and other infrastructure, and some chemical storage and metering facilities. iii. The long-term agreement also addresses conveyance of Brentwood's ECCID raw water supply through CCWD-owned facilities. The agreement provides for the recovery of costs for use of the existing facilities and the allocation of costs for construction of new conveyance facilities in the future to meet Brentwood's and CCWD's conveyance needs.

5. OVERLAPPING SERVICE BOUNDARY RESOLUTION
A. In order to avoid overlapping service boundary conflicts and comply with restrictions on service to lands burdened by liens for indebtedness under general obligation bonds and/or subject to contracts with the United States, Brentwood covenants and agrees that at no time hereafter will Brentwood distribute or permit the use of any water under its control within the territory of CCWD, as it exists on the effective date of this Agreement except as provided for in Sections 5.B, 5.C, 5.D, and 5.E of the Agreement.

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B. It is mutually understood and agreed upon that all past and future annexations of territory into Brentwood approved by LAFCO shall serve as notification to CCWD of Brentwood's intent to distribute or serve water within the newly annexed territory. Brentwood shall not distribute or serve water to customers of CCWD, outside of the City of Brentwood City limits, without CCWD's express written permission, and the express written permission of the wholesale municipal customer of CCWD, if any, into whose territory or sphere of influence such water would be served. In addition, Brentwood shall not distribute or serve water to any of CCWD's existing wholesale or retail customers without CCWD's express written permission, and shall not distribute or serve water to any retail customers of CCWD's existing wholesale customers without the express written permission of the affected wholesale municipal customer.

C. Brentwood understands and agrees, on its own behalf and on behalf of its customers, that CCWD is not, and shall not, become obligated to provide water from the facilities comprising the Los Vaqueros Project for use by Brentwood outside the Los Vaqueros Service Area of CCWD.

D. Brentwood shall receive the benefits, rights, privileges and obligations of all other CCWD municipal raw water customers, for each and every connection, and only those connections, providing water service entirely within CCWD's Los Vaqueros Service Area for which the applicable rates and charges have been paid and continue to be paid, as set forth in Section 4.C, including 4.C.iii. The benefits shall not accrue to any connection outside of CCWD's Los Vaqueros Service Area.

E. Emergency use. In such circumstances as described in subsection 4.B.i, CCWD shall provide to Brentwood water of the following quantities and rates. i. Pursuant to Subsection 4.B.ii, CCWD shall make available to Brentwood an amount of water not to exceed 0.67 afa for each and every purchased equivalent meter connection, and only those connections, for which Brentwood has paid the applicable charges pursuant to Subsection 4.C.iii. CCWD may reduce the amount available to Brentwood in a manner proportionate to the reductions, if any, in CCWD's Code of Regulations and policies, and consistent with the quantities being furnished to CCWD's wholesale municipal customers. The amount of water furnished under such circumstances shall not exceed the amount that would have been normally delivered during the same period in the absence of such circumstance, or 3,202 acre-feet, (4, 760 equivalent connections, times 0.67 afa/connection) whichever is less. ii. For water delivered pursuant to Subsection 5.E.i and 4.B.ii, Brentwood shall pay the treatment costs as set forth in Subsection 4.C.iv and the then current wholesale municipal raw water rate as set forth in CCWD's Code of Regulations, Section

5.020.0 10.
iii. Water deliveries under the circumstances described in Subsection 4.B.i that would exceed the amount set forth in Subsection 5.E.i shall be governed by Subsection

4.B.iii.

6. ENVIRONMENTAL COMPLIANCE, PERMITS AND APPROVALS
A. Brentwood was the lead agency and is fully responsible for all environmental compliance including permits and CEQA approvals associated with its purchase and use of the ECCID Second Amendatory Agreement between the Contra Costa Water District and the City of Brentwood Page 11 of 16

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water supply, interim treatment at the Randall-Bold Water Treatment Plant, the purchase of a capacity right at the Randall-Bold Water Treatment Plant described in Section 4.F, construction and use of the pump station described in Section 4.G., construction and use of long-term treatment facilities described in Section 4.H, and distribution to its customers.

Environmental compliance shall be at Brentwood's sole cost. CCWD will provide assistance to Brentwood as needed to develop the required environmental documentation.

B. CCWD's performance under this Agreement shall not conflict with its permits or other service agreements, including the Joint Powers Agreement with DWD, the CCWD/ECCID/DWR Agreement dated April 11, 199 1, as amended, bond documents or state water rights permits. If any agreement has been superseded or replaced by subsequent agreement, bond documents or state water rights permits, then CCWD's performance shall not conflict with the agreements, bond documents and water rights permits in effect.

C. All specific water service arrangements under this Agreement (whether interim or otherwise) shall be consistent with conditions placed on CCWD and the Contra Costa Water Authority concerning the operation of the Randall-Bold Water Treatment Plant owned jointly by CCWD and DWD.

D. Nothing in this Agreement shall prevent Brentwood from acquiring additional sources of water, exclusive of waters that are or were subject to the agreement between CCWD and ECCID.

7. AUDITS
A. Each party may at its expense conduct a financial audit of the other party in matters pertinent to this Agreement upon written request.

B. An audit shall not be conducted more frequently than annually and the right to audit shall not exceed the four fiscal years preceding and including the notice of audit. Each party will maintain true and complete records and will retain such records for at least four years.

Any claim arising from the audit will not be barred by the statute of limitations so long as the claim is filed within one year of commencing the audit.

C. The agency being audited shall provide such assistance as may be reasonably required in the course of such audit. Any such audit shall be conducted in accordance with generally accepted auditing principles for audits of State and local governmental units. The accounting shall be maintained substantially in accordance with the Governmental Generally Accepted Accounting Principles (GAAP) for State and Local Governments.

D. In the event the audit determines that Brentwood has either been overcharged or undercharged for the services provided by CCWD under this Agreement, Brentwood shall either be credited against future charges for the amount it overpaid or pay CCWD the additional amount owed.

8. SCHEDULE FOR TREATED WATER SERVICE
A. Nothing in this Agreement shall obligate CCWD to provide long-term conveyance or treatment of more than 3,200 acre-feet per year for Brentwood of water obtained from any source of supply for treatment at the RBWTP.

Second Amendatory Agreement between the Contra Costa Water District and the City of Brentwood Page 12 of 16

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B. On or before December 1 of each year, Brentwood shall submit in writing a proposed monthly delivery schedule for the ensuing year beginning January 1 of the following year.

The proposed delivery schedule shall be in the form provided by CCWD and shall indicate the approximate amounts of treated water desired by Brentwood during each month of the ensuing year. Brentwood's anticipated monthly delivery schedule shall not constitute a commitment by Brentwood to receive the amount of water set forth therein but shall establish the monthly scheduled amounts of treated water to be delivered to Brentwood for planning and budgetary purposes. Rates and charges that are based on delivery amounts will be set for the ensuing fiscal year based on this schedule. Brentwood may submit to CCWD a revised delivery schedule from time to time as it is required by factors or events beyond the reasonable control of Brentwood. Within sixty (60) days of the close of each fiscal year, Brentwood shall pay, or receive a refund for, any costs that varied from the estimated amounts.

9. TERMINATION
A. No part of this agreement or amendment may be modified or terminated without written concurrence of each agency's governing body. It is further understood by Brentwood and CCWD that the capacity right, once it is purchased by Brentwood making the lump sum payments set forth in Section 4.F.iii, shall be for the life of the Randall-Bold Water Treatment Plant as further described herein, assuming that Brentwood pays all rates and charges described herein for the services provided by CCWD.

B. In the event this agreement is terminated, Brentwood shall pay to CCWD for all actual connections not yet paid in the amounts described in Subsection 4.C.iii. Such payment shall be made prior to ninety (90) days after the effective date of termination.

C. The provisions of this section shall prevail notwithstanding other provisions of this agreement.

10. DISPUTE RESOLUTION
A. Mediation. The parties agree to first submit any dispute arising out of or in connection with this Agreement to a mutually acceptable professional mediator and to negotiate in good faith toward reaching an agreement with respect to the dispute. In such event, neither party shall proceed with arbitration until the completion of the mediation, the mediation being an express condition precedent to further remedies. The parties may, however, agree in writing to proceed directly to arbitration.

B. Binding Arbitration. Should the parties be unable or unwilling to resolve their dispute through the mediation process provided in Section 1 O.A above, either party may give written notice to the other party and elect to have the matter resolved by final and binding arbitration in accordance with the rules and procedures of the arbitrator selected in accordance with this Section 10.B (the "Arbitrator"). The party seeking arbitration shall set forth in its notice the particulars of its claims and shall state with specificity the issue(s) to be submitted to arbitration and the relief sought. Within thirty (30) days of the date of the election to arbitrate, the parties shall select a single, mutually agreeable arbitrator. If the parties are unable to agree, they shall request that the Judicial Arbitration and Mediation Service, Inc. ("JAMS") if such entity is then in existence, appoint an Arbitrator in accordance with then-current procedures. The arbitrator shall be a retired judge of the Superior Court of California, or the Court of Appeal of California, or a retired judge of the Second Amendatory Agreement between the Contra Costa Water District and the City of Brentwood Page 13 of 16

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United States District Court sitting in California. If JAMS is not in existence, the Presiding Judge of the Contra Costa Consolidated Court of Unlimited Jurisdiction shall appoint an Arbitrator in accordance with its then-current procedures.

The rules and procedures for arbitration shall be as follows:
i. The Arbitrator shall be selected and arbitration shall be conducted within a reasonable time, but in no event later than ninety (90) days after the date upon which the demand for arbitration is filed.
ii. The arbitration proceedings shall be conducted in Contra Costa County, California, at a time and location as agreed to in writing by the parties, or in absence of an agreement, as designated by the Arbitrator.
iii. Subject to the same rules pertaining to privileged communications and attorney work product that would apply if the proceeding was filed in the courts of the State of California, the Arbitrator shall have the authority to make all decisions regarding the relevance, materiality, and admissibility of all evidence offered at the arbitration. iv. The Arbitrator may issue any remedy or relief, whether provisional or permanent, including but not limited to a default judgment, which the parties could have obtained under the law applicable in courts of the State of California under the same factual circumstances, and the Arbitrator shall follow and otherwise employ the standards for issuing such relief as defined by California law; provided, however, that the Arbitrator shall have no authority or jurisdiction to enter an award for consequential, special, exemplary or punitive damages. The Arbitrator may also grant such ancillary relief as is necessary to make effective the award.
v. Both parties may conduct discovery as if the matter were pending before a Superior Court of the State of California and the Arbitrator shall have the full power of the State of California to issue and enforce subpoenas and to award sanctions. Either party shall have the right to demand in writing that the other party provide a list of witnesses it intends to call at the hearing, designating which witnesses will be called as expert witnesses, and a list of documents it intends to introduce at hearing. The responding party's list(s) shall be served personally or by registered or certified mail on the requesting party, with a copy to the Arbitrator, at least thirty (30) days before the hearing.
vi. Each party shall have the right to be represented by counsel. vii. No later than sixty (60) days following closing of the arbitration hearing, the Arbitrator shall make an award and issue a written opinion consisting of findings of fact and conclusions of law and setting forth the bases of the award. The Arbitrator may include in his or her award pre-award interest and post-award interest at the legal rate where authorized by law. The party against whom the award is made or remedy or relief ordered shall have thirty (30) days after receipt of the award or order to commence and thereafter diligently pursue to completion any action or proceeding in any court of the State of California of appropriate jurisdiction located in the County of Contra Costa to obtain judicial review of the award or order. If the award of order is mailed, it shall be deemed to be received within five days after deposit in the mail.

Second Amendatory Agreement between the Contra Costa Water District and the City of Brentwood Page 14of 16

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viii. If no such action or proceeding is timely commenced, the award or order shall thereupon immediately become final. The party against whom the award is made or remedy or relief ordered shall within thirty (30) days after the award or order becomes final make full payment and/or commence and thereafter diligently pursue to completion any other action required by the award or order. The party in whose favor the award is made may request and obtain from any court of the State of California of appropriate jurisdiction located in the County of Contra Costa a Judgment upon the award rendered by the Arbitrator, which may thereafter be entered in the records of said court.
ix. If an action or proceeding is timely filed in any court of the State of California of appropriate jurisdiction located in the County of Contra Costa to obtain judicial review of the award or order, the parties shall have the right to seek vacation or modification of any portion of the award that is based in whole, or in part, on an incorrect or erroneous ruling of law, in addition to the limited statutory right to seek vacation or modification of an award pursuant to the law applicable to non-judicial arbitration. The findings of fact of the Arbitrator shall be binding on all parties and shall not be subject to further review except as otherwise allowed by the law applicable to non-judicial arbitration. x. The Arbitrator shall be paid a per diem or hourly charge as established at the time of appointment. Each party shall bear its own attorneys' fees and costs in presenting its case. All other actual costs of conducting the arbitration, including without limitation the administrative fee and the Arbitrator's compensation, shall be shared equally. xi. This arbitration clause shall be interpreted under the arbitration laws of the State of California and not the Federal Arbitration Act, 9 U.S.C.§ 1. Except as otherwise provided in this Agreement, any motion, application, complaint or proceeding arising out of or relating to this arbitration clause shall be determined in accordance with the law of the State of California.
xii. Unless otherwise provided in this Agreement or otherwise agreed in writing, the parties shall continue to perform their respective obligations under this Agreement during the pendency of arbitration proceedings.
xiii. Except as modified or stated to the contrary in this Section 10, the rules and procedures of the Arbitrator in effect at the time of the arbitration shall apply to the arbitration procedure.

11. INDEMNIFICATION
A. Each party shall defend, indemnify and hold harmless the other party, its officers, directors, employees and agents, from and against any loss, cost or expense, including reasonable attorneys' fees, where such loss, cost or expense is caused, or claimed or alleged to be caused, by the sole negligence or willful misconduct of the indemnifying party, or its officers, directors, employees or agents, or by a breach of any obligation of this Agreement by the indemnifying party.

B. Where such loss, cost or expense is caused, or claimed or alleged to be caused, by the negligence or willful misconduct of both parties, or their officers, directors, employees or Second Amendatory Agreement between the Contra Costa Water District and the City of Brentwood Page 15 of 16

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agents, or by a breach of any obligation of this Agreement by both parties, each party shall defend, indemnify, and hold harmless the other party in proportion to their proportionate fault as determined by mutual agreement or by arbitration or judicial decree.

12. AMENDMENT AND RESTATEMENT
A. This Second Amendatory Agreement amends and restates in their entirety the Original Agreement and First Amendatory Agreement. The Original Agreement and the First Amendatory Agreement are of no further force and effect.

IN WITNESS THE REOF, the parties hereto have made and execute this Amendment as of the date and year first written above.

CITY OF BRENTWOOD
By: fdP7� ;;{"'1-noUA
Donna Landeros, City Manager
ATTEST:

Approved as to Form:

Dakrtw�eyew=-
ATTEST:

Approved as to Form:

District Legal Counsel
Second Amendatory Agreement between the Contra Costa Water District and the City of Brentwood Page 16of 16

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EXHIBIT 1 - Costs for Water Service to Brentwood Customers Outside CCWD The principle is for Brentwood to reimburse CCWD for its actual O&M costs for pumping and conveying ECCID water, plus wear and tear and rental of facilities. Wear and tear is based upon the current depreciated booked value of the raw water system (exclusive of Los Vaqueros Project [" LVP"] facilities) and rental on the interest only portion of any debt service for raw water facilities (exclusive of LVP facilities). Costs per acre-foot are based on actual costs divided by total sales of water delivered (actual rates will vary based upon the total annual usage in acrefeet and the maximum month in acre-feet; typically the per acre-foot cost for treatment will decrease as more water is used). Annual rates are set based on estimated costs with an annual adjustment per Section 8.C.

The example costs assumes rates in effect for Fiscal Year 2008 and assumes Brentwood's utilization of the Randall-Bold Water Treatment Plant does not exceed 6 mgd. For raw water pumping and conveyance charges, losses (which run between 5% and 7%) are added to the amount of water leaving the Treatment Plant to determine the total amount of water pumped from the Delta. Charges for raw water pumping and conveyance are based on the total water pumped from the Delta. Treatment charges are based on the total water treated (water leaving the plant plus treatment plant losses).

COMPONENT Example Cost BASIS FOR ACTUAL CHARGES
for 2008
($ oer af)
Conveyance
Raw Water O&M $73/af Raw water operations and maintenance of raw water facilities exclusive of Los Vaqueros Project O&M and CVP water and power costs. Included are:

Raw water pumping plant facilities operations and
maintenance exclusive of power for pumping CVP and
LVP water. Basis is total annual District cost divided by total annual District raw water sales.
(Fiscal Year 2008 example: $7/af)
Canal operations and maintenance, raw water
transmission and distribution maintenance (excluding LVP costs but including non- LVP raw water storage). Basis is total annual District cost divided by total annual District raw water sales.
(Example: $42/af)
General Administration. Basis is total cost of general
administration pro-rated based on the ratio of Brentwood's raw water to total annual District raw water O&M costs
(exclusive of water purchases and power costs) divided by total annual raw water sales.
(Example: $24/af)
Raw Water $49/af Wear and Tear and rental of conveyance facilities:

Facilities Wear Wear and Tear: depreciated book value of the non- L VP and Tear and raw water facilities depreciated over the remaining life, per Rental acre-foot of total annual District raw water sales. (Example: $35/af)
Rental based annual interest on raw water facilities
Second Amendatory Agreement between the Contra Costa Water District and the City of Brentwood Exhibit I, Page I of 2

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exclusive of LVP facilities, divided by total annual District raw water sales.
(Example: $14/af)
SUB-TOTAL $122/af Estimated FY2008 O&M, wear and tear and rental for ECCID water conveyance to Randall-Bold Treatment Plant
ECCID water $16/af This is the estimated cost to pump ECCID water using pumping alternate District power sources (e.g. MID power, 2008). $16 is 2008 average estimated rate based on MID contract and current power market. Actual charge will be estimated and corrected each year.

CVP charge $5/af 2008 pass-through charge from the USBR for using CVP for wheeling facilities for non-CVP water
SUB-TOTAL $143/af Estimated FY2008 total charge for pumping and conveying ECCID water to Randall-Bold Treatment Plant per acrefoot of water pumped from the Delta Treatment and $180/af See Exhibit 3.

Treated Water
Pumoina
Administrative $1/af Agreement administration
costs
GRAND TOTAL $324/af Sum of raw water conveyance, treatment and administrative costs.

Charges in addition for the use of Los Vaqueros Facilities, should such use be necessary when ECCID water cannot be pumped from Rock Slough and more water is needed than is available based on connections in the CCWD service area. Wear and Tear and Rental are based on depreciated value and the interest only portion of the debt service, respectively." Optional Charges As specified in section 4.c.ii.B
Interest on LV debt $200/af Debt service interest allocated to wholesale municipal customers applied to the quantity for
Brentwood measured at the point of diversion into
the LVP system. Basis is total annual interest
portion of debt service for L VP divided by total
annual District raw water sales.
(Example: $200)
LV O&M $10/af Estimated O&M for pump plants, conveyance and storage. Basis is total annual O&M cost for LVP
divided by total annual District raw water sales.

SUB-TOTAL $210/af Additional charge for use of Los Vaqueros Facilities.

Second Amendatory Agreement between the Contra Costa Water District and the City of Brentwood Exhibit 1, Page 2of 2

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EXHIBIT 2 - Costs for Water Service to Brentwood Customers Within CCWD The principle is for Brentwood to pay the full cost of service based on CCWD's charges for wholesale raw water for municipal customers with a non-recording meter, with adjustments as described in section 4.iii.a (subtracting the direct purchase costs of CVP water and CVP power, and then adding in the costs of pumping and wheeling ECCID water). Rates shall be based assuming a meter necessary to supply 0.67 afa or 1200 gpd maximum day per actual connection and total water use capacity is based on the number of actual equivalent connections times 0.67 afa or 1200 gpd maximum day. Rates are as established in the CCWD Code of Regulations and are subject to change from time-to-time by the CCWD Board of Directors.

COMPONENT Example cost for BASIS FOR ACTUAL CHARGES
2008 ($ per af)
Conveyance Shall be based on raw water municipal
rates for non-recording metered service.

As specified in section 4.iii.a
Raw Water Quantity $522/af 5.20.0 10 C, $1.6032/ 1000 oallons Raw Water Demand, non $22/af 5.20.0 10 E, $1.464/gpm/month (based on recording meter typical max day per connection)
Raw Water Service Charoe $10/af 5.20.0 10 B, $154. 17/month Less CVP water ($33/af) Current approximate CVP cost of water.

Subtracted unless CVP water is used
because ECCID water is not available.

Less CVP power ($4/af) Current approximate CVP power cost.

Subtracted unless CVP water is used
because ECCID water is not available .

Plus pumpi ng $16/af This is the estimated cost to pump ECCID water using alternate District power sources
(e.g. MID power)
Plus wheeling $5/af 2008 pass-through charge from
Reclamation for using CVP facilities for
non-CVP water
SUB-TOTAL $538/af
Treatment and Treated $180/af See Exhibit 3
Water Pumping
Contract Administration $1/af
costs
GRAND TOTAL $71 9/af
Second Amendatory Agreement between the Contra Costa Water District and the City of Brentwood Exhibit 2, Page lof2

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Connection Fee
Facilities Component
Equivalent meter charge
Less Future Water Supply
TOTAL per connection
E :qu1va en t Mt e er C onnect1ons
Meter Size
1" Residential
1"
1 1/2"
2"
Dual 2"
3"
4"
6"
8"
10"
12"
Notes:

Example per
connection
$4,843
($ 1,4 10)
$3,433
As specified in section 4.iii.b and c
Per applicable table in section 5.20.0 1 OF
of CCWD Code of regulations for Los
Vaqueros Service Area (Service Area A).

Assumes Brentwood supplies fut ure
water
# of Equivalent
Gal/Minute Meters
20 1
50 2.5
100 5
160 8
320 16
320 16
500 25
1,000 50
1,800 90
2,900 145
4,300 215
(a) 1" Residential equivalency applies to single-family residential and non-residential developments that could otherwise be served through a smaller meter, but are required to have a larger meter due to local fire protection standards (fire sprinklers). (b) If a meter is up-sized due to fire protection requirements, then the meter equivalency will be based on the meter size that could have otherwise served the project absent the fire protection flow requirements.

Second Amendatory Agreement between the Contra Costa Water District and the City of Brentwood Exhibit 2, Page 2of 2

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EXHIBIT 3 - Costs for Water Treatment and treated Water Pumping Service to Brentwood Customers
The principle is for Brentwood to reimburse CCWD for its cost of service (O&M and fixed costs) for treatment of water at the Randall-Bold treatment plant and delivery of treated water using new facilities described in Section 4.G, plus wear and tear and rental for treatment above 6 mgd as more fully set forth in the table below. Per acre-foot charges are based on delivered water adjusted for transmission and plant losses. Fixed charges and rental (if not waived as set forth in the table below) are based on the average of the three largest months of use to date (in million gallons per day [mgd]) divided by CCWD's capacity (25 mgd).

This example assumes costs for Fiscal Year 2008, and assumes Brentwood's use of the treatment plant does not exceed 6 mgd. Treatment plant losses are added to the water leaving the plant. Charges will be based on Brentwood's share of actual costs.

COMPONENT Example BASIS FOR ACTUAL CHARGES
cost for 2008
($ per af)
A. Treatment
Fixed $95/af Ratio of Brentwood's 6 mgd capacity right to CCWD's 25 mgd (i.e. 6/25ths), multiplied by CCWD's share of
the fixed costs per the JPA with DWD. If the average
of the three largest months of use is greater than 6
mgd, then the actual average of the three largest
months will be used to calculate the ratio. This is
adjusted annually.

Variable $45/af Ratio of Brentwood's volume to total volume treated at the plant multiplied by CCWD's variable costs for
treatment. This is adjusted annually.

Interest on RBWTP $0/af Rental fee for use of the plant for treatment in excess debt of 6 mgd. Based on the ratio of three largest months use (service to date) to 25mgd, multiplied by CCWD's
share of interest on the debt for the plant. If the
average of the three largest months is less than 6
mgd then the rental fee will be waived. If greater than 6 mgd, then the rental fee will be based on the ratio of three largest months use (less 6 mgd) to 25 mgd,
multiplied by CCWD's share of interest on the debt for
the plant. For example if the three-month average is 7
mgd, Brentwood would pay 1/25ths of CCWD's debt
service payment.

Wear and Tear $0/af If the average of the three largest months is less than 6 mgd then wear and tear will be waived. If greater
than 6 mgd, then the fee will be based on the ratio of
three largest months use (less 6 mgd) to 25 mgd,
multiplied by book value of RBWTP depreciated over
30 years.

Treated Water Pump $40/af Fully dedicated to Brentwood ; Brentwood pays 100% Station O&M of O&M costs. Cost estimated from CDM Draft Summary Report, August 2003.

TOTAL TREATME NT $180/af Subject to annual revision based on actual costs

AND TREATED

WATER PUMPING
Second Amendatory Agreement between the Contra Costa Water District and the City of Brentwood Exhibit 3, Page lof 1

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EXHIBIT 4 - Methodology to Determine Second Payment of the Facilities Component The Second Payment shall equal the Unpaid Connection Payment, as defined below, minus the First Payment (which equals $750,000). The Unpaid Connection Payment equals (1) the total number of Equivalent Meter Connections in the overlap area, based upon building permits, up to and including the date CCWD invoices Brentwood for the Second Payment, which have not been otherwise paid for by Brentwood pursuant to the Agreement or First Amendatory Agreement ("Unpaid Connections"), multiplied by (2) the Facility Component of the Wholesale Municipal Rate ("FRC") in effect at the time of the invoicing of the Second Payment. Equivalent Meter Connections will be determined based on the Equivalent Meter Connections table provided in Exhibit 2.

Example Calculation:

Actual number of connections in the overlapping service boundaries: 2,6 15 connections Number of connections paid for by the City as of May 2009: 2, 15 1 connections Total unpaid Facility Component as of May 2009: $1,489,904 [ (2,6 14 - 2, 151) * $3,211 /connection ]
Amount of initial payment per Section 4.C.iii.c: $750,000 Amount Due for Second Payment: $739,904
(1,489,904 - $750,000)
Second Amendatory Agreement between the Contra Costa Water District and the City of Brentwood Exhibit 4, Page 1of 1

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CERTIFIED A TRUE COPY OF THE ORIGINAL
RESOLUTION NO. 09-11

A RESOLUTION OF THE BOARD OF DIRECTORS OF THE

CONTRA COSTA WATER DISTRICT APPROVING AN AMENDMENT TO THE

AGREEMENT BETWEEN THE CONTRA COSTA WATER DISTRICT AND THE CITY

OF BRENTWOOD
WHEREAS, the Contra Costa Water District (CCWD) and the City of Brentwood (Brentwood) entered into an Agreement effective January 1, 2000, in order to provide for their long-term water supplies, to provide the basis for a potential long-term agreement between CCWD and Brentwood for conveyance and treatment of Brentwood's water, and to resolve potential conflicts regarding service in overlapping service boundaries by providing a means by which Brentwood can lawfully serve water to customers in CCWD's territory.

WHEREAS, CCWD and Brentwood entered into a First Amendment to the Agreement on September 24, 2003, in order to provide for Brentwood's purchase of a portion of CCWD's share of the capacity of the Randall-Bold Water Treatment Plant and to continue to address longterm drinking water supplies; WHEREAS, CCWD and Brentwood find it in their best interests to enter into a Second Amendment to the Agreement to amend portions of the agreement to recognize that certain requirements of the prior version of the agreement have been successfully completed, and enable the parties to reconcile the facilities component of the wholesale municipal rate for connections within the overlapping service boundaries of CCWD and Brentwood resulting from changes in the City's land use planng assumptions;

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Resolution No. 09-1 1
June 17, 2009

Page 2 ends

NOW, THEREFORE, BE IT RESOLVED by the Board of Directors of the Contra Costa Water District, that the General Manager or his designee is hereby authorized and directed to execute for and on behalf of this District, a Second Amendatory Agreement between Contra Costa Water District and the City of Brentwood, in a form approved by legal counsel. **********
The foregoing Resolution was duly and regularly adopted at a meeting held on the 17th day of June, 2009 by the Board of Directors of the Contra Costa Water District by the following vote of the Board:

ATTEST:

AYES: Boatmun, Burgh, Anel lo, Campbell
NOES: None
ABSTAIN: None
ABSENT: Wan dry
District Secretary

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2025 Urban Water Management Plan
E
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.

Appendix E: Reduced Delta Reliance Reporting

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2025 Urban Water Management Plan Appendix E
E
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.

This page intentionally left blank.

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Appendix E Reduced Delta Reliance Reporting
E-1
Appendix E
City of Brentwood’s Reduced Delta
Reliance Reporting
E.1 Background
The Sacramento-San Joaquin Delta Reform Act of 2009 (Delta Reform Act) established two co-equal goals of providing a more reliable water supply for California and protecting, restoring, and enhancing the Delta ecosystem. As part of the Delta Reform Act, the Delta Stewardship Council (DSC) was created who then developed and adopted the Delta Plan in 2013. The Delta Plan is a comprehensive, long-term, legally enforceable plan guiding how federal, state, and local agencies manage the Delta’s water and environmental resources. Included in the Delta Plan is Delta Plan Policy WR P1, Reduce Reliance on the Delta Through Improved Regional Water Self-Reliance (WR P1). WR P1 is relevant to any state or local public agency that anticipate participating in or receiving water from a proposed covered action such as a multi-year water transfer, conveyance facility, or new diversion that involves transferring water through, exporting water from, or using water in the Delta. Prior to initiating the implementation of that action, agencies must prepare a written certification of consistency with detailed findings as to whether the covered action is consistent with applicable Delta Plan policies and submit that certification to the DSC. WR P1 identifies UWMPs as the tool to demonstrate consistency with state policy to reduce reliance on the Delta for an agency that carries out or takes part in a covered action.

E.2 Demonstrating Reduced Reliance on the Delta
The analysis and documentation provided below includes all of the elements described in WR P1, namely subdivisions (c)(1)(B) and (c)(1)(C), that need to be included in a water supplier’s UWMP to document and quantify supplies contributing to reduced reliance on the Delta watershed and improved self-reliance. The approach is consistent with what is included in Appendix C of the DWR Guidebook. Some of the key assumptions that went into the City’s reduced reliance analysis include:
• All data were obtained from the current 2025 UWMP or previously adopted UWMPs and represent average or normal water year conditions.
• No projects or programs that are described in the UWMPs as “Future Water Supply Projects or Programs” were included in the accounting of supplies.
• This analysis uses a normal water year representation of 2010 as the baseline. Data for the 2010 baseline was taken from the City’s 2005 UWMP as the UWMPs generally do not provide normal water year data for the year that they are adopted (i.e., 2005 UWMP forecasts begin in 2010, 2010 UWMP forecasts begin in 2015, and so on). This approach was used for 2015 and 2020 data as well, in that it was retrieved from the City’s 2010 through 2020 UWMPs, respectively. Data for 2030-2050 are from the current 2025 UWMP.

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Appendix E Reduced Delta Reliance Reporting
E-2
E.2.1 Water Use without Water Use Efficiency
WR P1 considers water use efficiency savings as a source of supply. Because the City does not explicitly estimate water use efficiency as a supply, the water demand data from the current and past UWMPs that was used for this assessment needed to be adjusted to properly reflect normal water year demands in the calculation of reduced reliance. The suggested approach included in Appendix C of the DWR Guidebook was utilized to make these adjustments. The approach assumes that the embedded water use efficiency savings can be calculated based on changes in forecasted per capita water use since the baseline. Once calculated, the embedded water use efficiency savings can be added to the expected outcome of water supplies that contribute to reduced reliance on Delta water. Supporting narratives and documentation for all the data shown in the tables are provided below.

The first step in the analysis involved adjusting total service area demands to reflect only demands that can implement water use efficiency measures (i.e., residential, agricultural, and commercial, industrial and institutional demands) but still include the embedded water use efficiency supply.

Demands for non-potable supplies, such as recycling for the City, are subtracted from the total service area demands; this is done to reflect the demand hardening aspects of non-potable supplies.

Table 1a presents the results of this adjustment.

Table 1a. Water Use for the City of Brentwood
Baseline
(2010) 2015 2020 2025 2030 2035 2040 2045 2050
Service AreaWater Demands withWater Use
Efficiency Accounted For 11,343 11,564 13,838 12,169 12,286 12,938 13,630 14,321 14,517 Non-PotableWater Demands 55 55 632 1,445 1,612 1,780 1,869 1,959 1,988 Potable Service Area Demands withWater Use
Efficiency Accounted For 11,287 11,508 13,205 10,724 10,673 11,158 11,760 12,362 12,529 Notes:

Baseline (2010) values – City’s 2005 UWMP, Table 5-5; Non-Potable water demand value was from the City’s 2010 UWMP, Table 4-13. 2015 values – City’s 2010 UWMP, Table 4-4
2020 values – City’s 2015 UWMP, Table 4-4
2025-2050 values – City’s 2025 UWMP, Table 4-1,
Table 4-5, Table 5-4 Units: AF
Table 1b. Service Area Population
Baseline
(2010) 2015 2020 2025 2030 2035 2040 2045 2050
Service Area Population 51,453 56,493 65,118 65,747 70,877 76,007 80,253 84,499 85,400 Notes:

Baseline (2010) values – City’s 2015 UWMP, SB X7-7 Table 5 in Appendix F 2015 values – City’s 2015 UWMP, Table 3-2
2020 values – City’s 2020 UWMP, Table 3-2
2025-2050 values – City’s 2025 UWMP, Table 3-2
Once the total service area water demands were adjusted, these were divided by the service area population numbers shown in Table 1b to obtain the per capita water use in GPCD, as shown in Table 1c. By calculating the incremental change in per capita water use relative to the 2010 baseline

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Appendix E Reduced Delta Reliance Reporting
E-3
and applying those back to the population numbers from Table 1b, the estimated water use efficiency supply can be calculated. These supply totals are shown in Table 1c.

Table 1c. Water Use Efficiency Since Baseline
Baseline
(2010) 2015 2020 2025 2030 2035 2040 2045 2050
Per Capita Water Use (GPCD) 196 182 181 146 134 131 131 131 131 Change in Per CapitaWater Use fromBaseline
(GPCD) -- -14 -15 (50) (62) (65) (65) (65) (65)
EstimatedWater Use Efficiency Since
Baseline,AF -- 886 1094 3,710 4,887 5,528 5,858 6,189 6,220 Notes:

Units: AF
This estimated water use efficiency supply can be considered an additional supply that may be used to show reduced reliance on Delta water supplies. Table 1d provides a summary of the data that were utilized in the next steps of the analysis.

Table 1d. Water Use without Water Use Efficiency Accounted For Baseline
(2010) 2015 2020 2025 2030 2035 2040 2045 2050
Service AreaWater Demands withWater Use
Efficiency Accounted For 11,343 11,564 13,838 12,169 12,286 12,938 13,630 14,321 14,517 EstimatedWater Use Efficiency Since Baseline -- 886 1,094 3,710 4,887 5,528 5,858 6,189 6,220 Service AreaWater Demands withoutWater Use
Efficiency Accounted For 11,343 12,450 14,932 15,879 17,173 18,466 19,488 20,510 20,737 Notes:

Units: AF
E.2.2 Water Supplies Contributing to Regional Self-Reliance As part of WR P1, agencies must include in their UWMP the expected outcome for measurable improvement in regional self-reliance as a reduction in water used from the Delta watershed. While WR P1 does not require that agencies demonstrate measurable improvement in regional selfreliance directly, the approach presented in Appendix C of the DWR Guidebook suggests agencies quantify the water supplies in their portfolio that contribute to self-reliance as a means of providing documentation that could help support a future certification of consistency for future water supply projects that are covered actions, such as the Los Vaqueros Reservoir Expansion. For this analysis it was assumed that the supplies contributing to the City’s self-reliance include the water use efficiency supply calculated in Section E.2.1, the recycled water it produces and distributes, and the City’s groundwater supplies. It was assumed that the City would meet 20 percent of its potable and raw water demands through its groundwater supply as this amount most closely aligns with the amount of groundwater the City typically uses during normal years. The supply totals are summarized in Table 2a.

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Appendix E Reduced Delta Reliance Reporting
E-4
Table 2a. Water Supplies Contributing to Regional Self-Reliance Water Supplies
Baseline
(2010) 2015 2020 2025 2030 2035 2040 2045 2050
Water Use Efficiency -- 886 1,094 3,710 4,887 5,528 5,858 6,189 6,220 Water Recycling 55 55 632 1445 1612 1780 1869 1959 1988 Stormwater Capture and Use -- -- -- -- -- -- -- --
AdvancedWaterTechnologies -- -- -- -- -- -- -- --
Conjunctive Use Projects 2259 2302 2642 2200 2200 2200 2200 2200 2200 Local and RegionalWater Supply and Storage
Projects -- -- -- -- -- -- -- --
Other Programs and Projectsthe Contribute to
Regional Self-Reliance -- -- -- -- -- -- -- --
Water Supplies Contributing to Regional SelfReliance 2,314 3,243 4,369 7,355 8,699 9,508 9,928 10,348 10,408 Notes:

Units: AF
Water use efficiency supply values are from Table 1c
Baseline (2010) water recycling values – City’s 2010 UWMP, Table 5-1 2015 water recycling values – City’s 2010 UWMP, Table 5-1 2020 water recycling values – City’s 2015 UWMP, Table 6-5 2025-2050 water recycling values – City’s 2025 UWMP, Table 5-8 and 5-9 Table 2b. Service Area Water Demands without Water Use Efficiency Baseline
(2010) 2015 2020 2025 2030 2035 2040 2045 2050
Service AreaWater Demands withoutWater Use
Efficiency Accounted For 11,343 12,450 14,932 15,879 17,173 18,466 19,488 20,510 20,737 Notes:

Water use demand values are from Table 1d
Units: AF
Using the water supplies from Table 2a, the change in water supplies contributing to regional selfreliance can be calculated relative to the 2010 baseline. These numbers are presented in Table 2c below.

Table 2c. Change in Regional Self Reliance
Baseline
(2010) 2015 2020 2025 2030 2035 2040 2045 2050
Water Supplies Contributing to Regional SelfReliance (Table 2a) 2,314 3,243 4,369 7,355 8,699 9,508 9,928 10,348 10,408 Change inWater Supplies Contributing to
Regional Self-Reliance -- 929 2,055 5,041 6,385 7,194 7,614 8,034 8,094 Notes:

Units: AF

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Appendix E Reduced Delta Reliance Reporting
E-5
The calculated values from Table 2c can also be expressed as a percentage of the water demands without water use efficiency savings accounted for. This is done by dividing the water supplies from Table 2a by the water demands included in Table 2b. The change in the percentage of regional water supplies can then be evaluated for each outcome year in the analysis compared to the baseline year to demonstrate increased regional self-reliance as shown in Table 2d.

Table 2d. Percent Change in Regional Self Reliance
Baseline
(2010) 2015 2020 2025 2030 2035 2040 2045 2050
Percent ofWater Supplies Contributing to
Regional Self-Reliance 20.4% 26.0% 29.3% 46.3% 50.7% 51.5% 50.9% 50.5% 50.2% Change in Percent of Water Supplies
Contributing to Regional Self-Reliance -- 5.6% 8.9% 25.9% 30.3% 31.1% 30.5% 30.1% 29.8% Notes:

Units: AF
E.2.3 Reliance on Supplies from the Delta Watershed
As part of WR P1, agencies must also include in their UWMP the expected outcomes for measurable reductions in supplies from the Delta watershed either as a quantity or as a percentage of their water supply portfolios. The City’s Delta water supply stems from a permanent entitlement to purchase 14,800 AFY (4,823 MGY) of surplus irrigation water from ECCID. ECCID has pre-1914 water rights, which historically have not been subject to delivery reductions during water shortages, including regulatory restricted and drought years. Historically, the City has not used its full purchase entitlement, instead relying on a mixture of both surface and groundwater supplies to meet potable water demands. For this reason, it was deemed not appropriate to include the full 14,800 AFY in the analysis for reliance on supplies from the Delta watershed. Instead, the values included in Table 3a are based on the totals that most closely represent the amount of supply the City would likely rely on to meet normal year demands. For this analysis it was assumed that the City would meet 80 percent of its potable water demands through its Delta purchase entitlement from 2010 through 2025 and 85 percent from 2025-2050 and the other 20 to 15 percent using groundwater. Groundwater supply is limited to about 2,200 AFY (the projected reasonably available groundwater supply). Table 3b shows the service area water demands without water use efficiency.

Table 3a. Reliance on Water Supplies from the Delta
Water Suppliesfrom the Delta
Watershed
Baseline
(2010) 2015 2020 2025 2030 2035 2040 2045 2050
CVP/SWP Contract Supplies -- -- -- -- -- -- -- -- --
Delta/Delta Tributary Diversions 9,030 9,207 10,564 8,579 9,072 9,485 9,996 10,508 10,649 Transfers and Exchanges -- -- -- -- -- -- -- -- --
OtherWater Suppliesfromthe Delta
Watershed -- -- -- -- -- -- -- -- --
TotalWater Supplies from the Delta
Watershed 9,030 9,207 10,564 8,579 9,072 9,485 9,996 10,508 10,649 Notes:

Units: AF

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E-6
Table 3b. Service Area Water Demands without Water Use Efficiency Baseline
(2010) 2015 2020 2025 2030 2035 2040 2045 2050
Service AreaWater Demands withoutWater Use
Efficiency Accounted For 11,343 12,450 14,932 15,879 17,173 18,466 19,488 20,510 20,737 Notes:

Water use demand values are from Table 1d
Units: AF
Using the water supplies from Table 3a, the change in water supplies contributing to Delta reliance can be calculated relative to the 2010 baseline. These numbers are presented in Table 3c below.

Table 3c. Change in Supplies from the Delta Watershed
Baseline
(2010) 2015 2020 2025 2030 2035 2040 2045 2050
TotalWater Supplies from the Delta Watershed 9,030 9,207 10,564 8,579 9,072 9,485 9,996 10,508 10,649 Change inWater Suppliesfromthe Delta
Watershed -- 177 1,534 -451 42 455 966 1,478 1,619
Notes:

Units: AF
The calculated values from Table 3c can also be expressed as a percentage of the water demands without water use efficiency savings accounted for. This is done by dividing the water supplies from Table 3a by the water demands included in Table 3b. The change in the percentage of Delta water supplies compared to the baseline year can then be evaluated for each outcome year in the analysis to demonstrate decreased reliance on supplies from the Delta watershed as shown in Table 3d.

Table 3d. Percent Change in Supplies fromthe Delta Watershed (As a Percent of Demand without Water Use Efficiency)
Baseline
(2010) 2015 2020 2025 2030 2035 2040 2045 2050
Percent ofWater Suppliesfromthe Delta
Watershed 79.6% 74.0% 70.8% 54.0% 52.8% 51.4% 51.3% 51.2% 51.4% Change in Percent ofWater Suppliesfromthe
DeltaWatershed -- -5.7% -8.9% -25.6% -26.8% -28.2% -28.3% -28.4% -28.3% Notes:

Units: MG
E.2.4 Summary of Expected Outcomes for Reduced Reliance on the Delta The following provides a summary of the near-term (2030) and long-term (2050) expected outcomes for the City’s self-reliance and Delta reliance. The results show that the City is measurably improving self-reliance and reducing reliance on the Delta, both as an amount of water used and as a percentage of water used.

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Appendix E Reduced Delta Reliance Reporting
E-7
Expected Outcomes for Self-Reliance
• Near-term (2030) –Self-reliance is expected to increase to 8,699 AF in 2030 (Table 2c) from the 2010 baseline; this represents an increase of 30 percent of 2030 water demands (Table 2d).
• Long-term (2050) –Self-reliance is expected to increase to 10,408 AF in 2050 (Table 2c) from the 2010 baseline; this represents an increase of over 29 percent of 2050 water demands (Table 2d).

Expected Outcomes for Reduced Reliance on Supplies from the Delta Watershed • Near-term (2030) – The reliance on supplies from the Delta watershed are projected to increase by 42 AF in 2030 (Table 3c) from the 2010 baseline, this represents an overall decrease of over 26 percent in water supplies from the Delta that will be contributing towards meeting 2030 water demands compared to the 2010 baseline (Table 3d). • Long-term (2050) – While the reliance on supplies from the Delta watershed are projected to increase by 1,619 AF by 2050 (Table 3c) from the 2010 baseline, this actually represents an overall decrease of just over 28 percent in water supplies from the Delta that will be contributing towards meeting 2050 water demands compared to the 2010 baseline (Table 3d).

E.3 UWMP Implementation
In addition to the analysis presented above, WR P1 also requires that all programs and projects included in the UWMP that are locally cost-effective and technically feasible, and which reduce reliance on the Delta, are identified, evaluated, and are being implemented. As part of the UWMP process, the City identified ongoing and future projects that will improve existing and future water supplies for the City by reducing reliance on the potable water system and Delta supplies through improvements to the recycled water system. Section 5.8 of the City’s UWMP includes a brief description of each of this project that include estimates on the water supply that is expected to be available from each project and an implementation timeline for each project or program.

In addition to projects and programs described in the City’s UWMP, the City also conducts an ongoing water conservation program and has committed to continue to implement water conservation measures for all customer sectors. Water conservation can be achieved through managing the water supply and water demand. Supply management is used to improve the overall system efficiency and reduce waste within the production and delivery facilities. The City uses DMMs to encourage water conservation by the consumer. Section 8 of the City’s UMWP provides narrative descriptions addressing the nature and extent of each DMM implemented.

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2025 Urban Water Management Plan
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Appendix F: Water Waste Ordinance

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§ 14.01.510. Conservation—Water waste prohibited.

A. As a condition of service, customers of the city must use water delivered through the city's system in a manner that promotes efficiency and avoids waste. Water waste, including, but not limited to, the following actions, is a violation of this code and prohibited, except where necessary to address an immediate health and safety need or to comply with a term or condition in a permit issued by a state or federal agency:

1. Failure to correct a malfunctioning device or supply line where the customer or their agent has known of the problem for more than forty-eight hours.

2. Discharging swimming pool or spa water drainage off the property where discharge into a public sanitary sewer is available.

3. The application of potable water to outdoor landscapes in a manner that causes runoff such that water flows onto adjacent property, non-irrigated areas, private and public walkways, roadways, parking lots, or structures.

4. Noncompliance with watering group assignments under a declaration of water shortage emergency.

5. The use of a hose that dispenses potable water to wash a motor vehicle, except where the hose is fitted with a shut-off nozzle or device attached to it that causes it to cease dispensing water immediately when not in use.

6. The application of potable water to driveways, sidewalks and other hardscaped surfaces.

7. The use of potable water in a fountain or other decorative water feature, except where the water is part of a recirculating system.

8. The serving of drinking water other than upon request in eating or drinking establishments, including, but not limited to, restaurants, hotels, cafés, cafeterias, bars, or other public places where food or drink are served and/or purchased.

9. Irrigation with potable water between eight a.m. and seven p.m. daily.

10. The application of potable water to outdoor landscapes during and up to fortyeight hours after a measurable rainfall.

11. The irrigation with potable water of landscapes outside of newly constructed homes and buildings in a manner inconsistent with regulations or other requirements established by the California Building Standards Commission and the Department of Housing and Community Development.

12. The use of potable water to irrigate ornamental turf on public street medians is prohibited.

B. To promote water conservation, operators of hotels and motels shall provide guests City of Brentwood, CA
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(Ord. 918 § 2, 2013; Ord. 974 § 3, 2016)
with the option of choosing not to have towels and linens laundered daily. The hotel or motel shall prominently display notice of this option in each guestroom using clear and easily understood language.

C. A violation of the regulations in subsections A through B is unlawful, and may be enforced pursuant to Section 14.01.1015 of this chapter.

City of Brentwood, CA
§ 14.01.510 § 14.01.510
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2025 Urban Water Management Plan
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Appendix G: Emergency Response Plan
(Cover and Table of Contents)

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2025 Urban Water Management Plan Appendix G
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FINAL REPORT | Prepared for
City of Brentwood, California
Emergency
Response Plan
June 2021

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201 North Civic Drive, Suite 300
Walnut Creek, CA 94596
T: 925.937.9010
Emergency Response Plan
Prepared for
City of Brentwood, California
June 2021
Project No. 155802

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Emergency Response Plan
ii
Record of Revisions
Revision Log
Description of Change Name/ Title Date

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Emergency Response Plan
iii
Plan Distribution
Plan Distribution List
Recipient/Title Distributed By Date

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iv
Table of Contents
List of Figures.............................................................................................................................................. vi List of Tables ...............................................................................................................................................vii List of Abbreviations ..................................................................................................................................viii

1. Introduction ...................................................................................................................................... 1-1

1.1 Purpose .................................................................................................................................. 1-1

1.2 Regulatory Requirements...................................................................................................... 1-1

1.3 Relationship between ERP and other Plans ........................................................................ 1-3

1.4 Relevant Disaster Events and Scenarios ............................................................................. 1-3

1.4.1 Earthquake .............................................................................................................. 1-3

1.4.2 Wildfires ................................................................................................................... 1-3

1.4.3 Flooding.................................................................................................................... 1-4

1.4.4 Contamination of Source Water – Accidental ....................................................... 1-4

1.4.5 Contamination of Finished Water – Accidental..................................................... 1-4

1.4.6 Contamination of Finished Water – Intentional .................................................... 1-4

1.4.7 Theft or Diversion .................................................................................................... 1-4

1.4.8 Sabotage – Physical................................................................................................ 1-4

1.4.9 Cyberattack on Business Enterprise Systems ....................................................... 1-4

1.4.10 Cyberattack on Process Control Systems .............................................................. 1-4

1.4.11 Dependency – Key Suppliers.................................................................................. 1-5

1.4.12 Dependency – Power Utility .................................................................................... 1-5

1.4.13 Other Threats........................................................................................................... 1-5

1.5 Summary of RRA Results ...................................................................................................... 1-5

1.6 Access Control ....................................................................................................................... 1-6

1.7 Plan Overview......................................................................................................................... 1-6

2. Utility Information............................................................................................................................. 2-1

2.1 Utility Overview....................................................................................................................... 2-1

2.2 Personnel Information........................................................................................................... 2-5

2.3 Primary Utility Components................................................................................................... 2-5

2.4 Industry Chemical Handling and Storage Facilities ........................................................... 2-11

2.5 Safety Supplies .................................................................................................................... 2-11

2.6 Response Equipment .......................................................................................................... 2-11

2.7 Key Local Services............................................................................................................... 2-17

3. SEMS/ICS Integration and Organization......................................................................................... 3-1

3.1 Five Levels and Principal Functions of SEMS ...................................................................... 3-1

3.2 City of Brentwood Incident Command Structure, Position Descriptions, and Assignments........................................................................................................................... 3-2

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Emergency Response Plan Table of Contents
v

3.3 Emergency Response Roles.................................................................................................. 3-2

4. Communication Procedures ............................................................................................................ 4-1

4.1 Drinking Water Field Operation Branch – Chain-of-Command ........................................... 4-1

4.2 Internal Communication........................................................................................................ 4-2

4.3 External Communication ....................................................................................................... 4-2

4.3.1 Critical Customer Contact List ................................................................................ 4-4

4.4 Public Notification.................................................................................................................. 4-9

4.4.1 Media Outreach and Risk Communication............................................................ 4-9

4.4.2 Emergency Water Quality Procedures.................................................................. 4-10

4.5 Cancellation of Public Notification...................................................................................... 4-11

4.6 Mutual Aid and Assistance.................................................................................................. 4-12

5. Emergency Plans and Procedures .................................................................................................. 5-1

5.1 Core Response Actions and Resources ............................................................................... 5-1

5.2 Employee Hazard Training .................................................................................................... 5-3

5.2.1 Identifying Emergencies.......................................................................................... 5-3

5.2.2 Use of Fire Extinguishers ........................................................................................ 5-3

5.2.3 First Aid and Ammonia Awareness......................................................................... 5-3

5.2.4 Evacuation Procedures ........................................................................................... 5-3

5.3 Emergency Equipment Inspection and Maintenance.......................................................... 5-5

5.4 Incident-Specific Response Procedures............................................................................... 5-5

5.4.1 Sodium Hypochlorite ............................................................................................... 5-6

5.4.2 Aqueous Ammonia .................................................................................................. 5-6

5.4.3 Fire Emergency ........................................................................................................ 5-6

5.4.4 Earthquake Emergency........................................................................................... 5-7

5.4.5 Civil Disturbance...................................................................................................... 5-7

5.5 Response Phase .................................................................................................................... 5-7

5.5.1 Initial Response....................................................................................................... 5-7

5.5.2 Damage Assessment .............................................................................................. 5-7

5.6 Recovery Phase ..................................................................................................................... 5-8

5.6.1 Recovery Planning................................................................................................... 5-8

5.6.2 Recovery Activities................................................................................................... 5-8

5.7 Termination and Review Phase ............................................................................................ 5-9

6. Water Quality Sampling ................................................................................................................... 6-1

6.1 Laboratory Resources............................................................................................................ 6-1

6.2 California Department of Public Health Laboratory............................................................. 6-1

6.3 California Mutual Aid Laboratory Network ........................................................................... 6-1

6.4 Chemical Analysis Classification........................................................................................... 6-2

6.5 Biological Analysis Classification .......................................................................................... 6-2

6.6 Natural Disaster..................................................................................................................... 6-2

6.7 Terrorist Event/Contamination Event................................................................................... 6-2

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Emergency Response Plan Table of Contents
vi

7. Mitigation Actions............................................................................................................................. 7-1

7.1 Alternative Source Water Options and Interconnected Utilities ......................................... 7-1

7.2 Planned Mitigation Actions ................................................................................................... 7-1

7.3 Additional Actions, Detection Strategies, and Resources to Improve System Resilience 7-2

8. Detection Strategies ........................................................................................................................ 8-1

9. Emergency Plan Approval, Update, Training, and Exercises ......................................................... 9-1

9.1 Plan Review and Approval..................................................................................................... 9-1

9.1.1 The City Approval Authority ..................................................................................... 9-1

9.1.2 Local Government Approval.................................................................................... 9-1

9.2 Practice and Update Schedule ............................................................................................. 9-1

9.2.1 Schedule and Responsibility for Training and Exercises ...................................... 9-1

9.2.2 Schedule for ERP Review and Update ................................................................... 9-1

9.3 Assessment of ERP Effectiveness ........................................................................................ 9-2

9.4 Training, Exercises, and Drills ............................................................................................... 9-2

10. References ..................................................................................................................................... 10-1 Appendix A: Public Notification Templates................................................................................................. A Appendix B: Incident Action Checklists.......................................................................................................B Appendix C: Bacteriological Sample Siting Plan ........................................................................................C Appendix D: Self-Certification......................................................................................................................D List of Figures
Figure 2-1. City of Brentwood distribution system................................................................................. 2-3 Figure 2-2. Chemical storage facilities ................................................................................................... 2-7 Figure 2-3. City of Brentwood key local services.................................................................................. 2-19 Figure 3-1. Incident Command Structure............................................................................................... 3-2 Figure 4-1. Division of Drinking Water organization .............................................................................. 4-1 Figure 4-2. City of Brentwood critical customers ................................................................................... 4-7 Figure 5-1. Primary assembly area ......................................................................................................... 5-4

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Emergency Response Plan Table of Contents
vii
List of Tables
Table 1-1. AWIA Requirements Checklist ............................................................................................... 1-2 Table 1-2. Relationship to Other Plans................................................................................................... 1-3 Table 1-3. Summary of Threats and Total Risk Costs............................................................................ 1-5 Table 2-1. Utility Information................................................................................................................... 2-1 Table 2-2. City of Brentwood Personnel ................................................................................................. 2-5 Table 2-3. Wells........................................................................................................................................ 2-9 Table 2-4. Treatment Plants.................................................................................................................... 2-9 Table 2-5. Storage and Distribution System .......................................................................................... 2-9 Table 2-6. Treatment Chemical Storage Facilities............................................................................... 2-10 Table 2-7. Other Key Facilities .............................................................................................................. 2-11 Table 2-8. Emergency Response Resource Inventory ......................................................................... 2-12 Table 2-9. Key Local Services ............................................................................................................... 2-17 Table 3-1. Internal Emergency Response Roles .................................................................................... 3-3 Table 4-1. External Response Partners .................................................................................................. 4-2 Table 4-2. Critical Customer List............................................................................................................. 4-5 Table 4-3. Media Contacts ...................................................................................................................... 4-9 Table 5-1. Access ..................................................................................................................................... 5-1 Table 5-2. Physical Security .................................................................................................................... 5-1 Table 5-3. Cybersecurity .......................................................................................................................... 5-2 Table 5-4. Power Loss.............................................................................................................................. 5-2 Table 5-5. Sampling and Analysis........................................................................................................... 5-2 Table 5-6. Family and Utility Personnel Well-Being................................................................................ 5-2 Table 7-1. Alternative Source Water Options ......................................................................................... 7-1 Table 7-2. Interconnected Utilities.......................................................................................................... 7-1 Table 7-3. Additional Actions to Improve System Resilience ................................................................ 7-2 Table 8-1. Detection Strategies .............................................................................................................. 8-1

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Emergency Response Plan Table of Contents
viii
List of Abbreviations
AWIA America’s Water Infrastructure Act of
2018
BC Brown and Caldwell
BSL biosafety lab
BWO Boil Water Order
CalARP California Accidental Release Prevention
Cal OES California Governor’s Office of Emergency
Services
CalWARN California Water/Wastewater Agency
Response Network
CAMAL NetCalifornia Mutual Aid Laboratory Network
CCWD Contra Costa Water District
CDC Centers for Disease Control and
Prevention
CDPH California Department of Public Health
CHP California Highway Patrol
City City of Brentwood
CST California National Guard Civilian Support
Team
DDW Division of Drinking Water
DWD Diablo Water District
DWRLB Drinking Water and Radiation Laboratory
Branch
DWP Drinking Water Program
Ea each
ELAP Environmental Laboratory Accreditation
Program
EOC Emergency Operations Center
ERP Emergency Response Plan
FBI Federal Bureau of Investigation
ft feet
gal gallon
gpm gal per minute
IAC Incident Action Checklist
ICS Incident Command System
IS Information Systems
kW kilowatt
LEPC Local Emergency Planning Committee
LRN Laboratory Response Network
MDL Microbial Disease Laboratory
MG million gal
mgd million gal per day
NRC National Response Center
OES Office of Emergency Services
PG&E Pacific Gas and Electric Company
PIO public information officer
PPE personal protective equipment
RRA Risk and Resilience Assessment
SCADA supervisory control and data acquisition
SCBA self-contained breathing apparatus
SEMS Standardized Emergency Management
System
SERC State Emergency Response Commission
SRLB Sanitation and Radiation Laboratory
USEPA United States Environmental Protection
Agency
UWA Unsafe Water Alert
VSAT Vulnerability Self-Assessment Tool
WMD Weapons of Mass Destruction
WTP water treatment plant

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2025 Urban Water Management Plan
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Appendix H: Contra Costa Hazard Mitigation Plan
(Cover and Table of Contents)

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2025 Urban Water Management Plan Appendix H
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VOLUME I
2024 Hazard
Mitigation
Plan
Contra Costa County,
California
Planning Area-wide Elements

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2024 Hazard Mitigation Plan
Contra Costa County, California
Table of Contents i

TABLE OF CONTENTS
Executive Summary................................................................................................................................1 Chapter 1. Introduction .................................................................................................................3

1.1 Purpose of the Plan...................................................................................................................3

1.2 Hazard Mitigation Program .......................................................................................................3

1.3 Planning Area............................................................................................................................4

1.4 Participating Jurisdictions..........................................................................................................4

1.5 Plan Participation ......................................................................................................................5

1.5.1. Core Planning Team............................................................................................................................ 5

1.5.2. Steering Committee ............................................................................................................................. 6

1.5.3. Local Planning Teams and Community Representatives.................................................................... 7

1.5.4. Supporting Organizations .................................................................................................................... 7

1.6 Plan Approval and Adoption......................................................................................................7 Chapter 2. Planning Process ........................................................................................................8

2.1 Review of Existing Programs and Plans .................................................................................10

2.2 Equity Consideration for the Underserved Population ............................................................11 Chapter 3. Community Profile ....................................................................................................14

3.1 Contra Costa County History ..................................................................................................15

3.2 Topography .............................................................................................................................15

3.3 Climate....................................................................................................................................16

3.4 Land Use.................................................................................................................................18

3.5 Changes in Development & Development Trends ..................................................................20

3.5.1. Implications of Development on Risk................................................................................................. 20

3.6 Future Trends in Development................................................................................................21

3.7 Demographics .........................................................................................................................21

3.7.2. Underserved Population .................................................................................................................... 24

3.8 Economy .................................................................................................................................26

3.9 Critical Infrastructure...............................................................................................................28

3.10 Capability Assessment............................................................................................................30

3.10.1. Planning and Regulatory Capabilities ........................................................................................... 30

3.10.2. Administrative and Technical Capabilities..................................................................................... 33

3.10.3. Financial Capabilities..................................................................................................................... 36

3.10.4. Education and Outreach Capabilities ............................................................................................ 37

3.11 Hazard Mitigation Integration ..................................................................................................38

3.11.1. Existing Plan Integration................................................................................................................ 39

3.11.2. Potential Future Integration ........................................................................................................... 39

3.12 National Flood Insurance Program .........................................................................................40

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Contra Costa County, California
Table of Contents ii

3.12.1. Contra Costa County Floodplain Management Program .............................................................. 41

3.12.2. Floodplain Managers ..................................................................................................................... 42

3.12.3. Participation Activities.................................................................................................................... 43 Chapter 4. Hazard Identification and Risk Assessment...........................................................44

4.1 Identified Hazards ...................................................................................................................44

4.2 Presidential Disaster and Emergency Declarations ................................................................46

4.3 Risk Assessment Methodology ...............................................................................................48

4.3.1. Probability of Occurrence................................................................................................................... 49

4.3.2. Extent Factors.................................................................................................................................... 50

4.3.3. Vulnerability Factors .......................................................................................................................... 51

4.3.4. Impact Factors ................................................................................................................................... 52

4.4 FEMA National Risk Index Scores ..........................................................................................56

4.4.1. Expected Annual Loss ....................................................................................................................... 56

4.4.2. Social Vulnerability............................................................................................................................. 57

4.4.3. Community Resilience ....................................................................................................................... 57

4.5 Total Risk Scores ....................................................................................................................58

4.6 Hazard Profiles........................................................................................................................61

4.6.1. Climate Change ................................................................................................................................. 61

4.6.2. Dam and Levee Failure...................................................................................................................... 76

4.6.3. Drought ............................................................................................................................................ 103

4.6.4. Earthquake....................................................................................................................................... 119

4.6.5. Flood ................................................................................................................................................ 142

4.6.6. Landslide.......................................................................................................................................... 167

4.6.7. Sea Level Rise................................................................................................................................. 182

4.6.8. Severe Weather............................................................................................................................... 196

4.6.9. Tsunami ........................................................................................................................................... 233

4.6.10. Wildfire......................................................................................................................................... 247

4.6.11. Other Hazard of Concern ............................................................................................................ 264 Chapter 5. Mitigation Strategy ..................................................................................................285

5.1 Mitigation Goals ....................................................................................................................285

5.2 Mitigation Strategies and Actions..........................................................................................286

5.2.1. Mitigation Action Plan ...................................................................................................................... 287

5.3 Changes in Priority................................................................................................................291 Chapter 6. Plan Maintenance ....................................................................................................294

6.1 Plan Update ..........................................................................................................................294

6.1.1. Monitoring, Evaluating ..................................................................................................................... 294

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Contra Costa County, California
Table of Contents i

APPENDICES
Appendix A. Mitigation Actions ...................................................................................................299 Appendix B. Stakeholder Engagement .......................................................................................356 Appendix C. Public Engagement.................................................................................................389 Appendix D. Plan Adoption ..........................................................................................................512

LIST OF TABLES
Table 1-1. Participating Jurisdictions .................................................................................................................... 5 Table 1-2. Core Planning Team Members............................................................................................................ 5 Table 1-3. Hazard Mitigation Steering Committee Members................................................................................ 6 Table 3-1. Contra Costa County Monthly Climate Summary (1970 – 2023) ...................................................... 17 Table 3-2. Acreages of Land Use Designations ................................................................................................. 18 Table 3-3. Population Estimates .................................................................................................................... 22 Table 3-4. Poverty Thresholds for 2022 by Size of Family ................................................................................. 23 Table 3-5. Age Distribution (2022) ................................................................................................................. 23 Table 3-6. Racial and Ethnic Distribution (2022) ........................................................................................... 24 Table 3-7. Social Vulnerability Index (2020) ....................................................................................................... 25 Table 3-8. Employment by Industry (2022)......................................................................................................... 27 Table 3-9. Employment Status (2022) ................................................................................................................ 27 Table 3-10. Occupation (2022)......................................................................................................................... 27 Table 3-11. Income and Benefits (2022) .......................................................................................................... 28 Table 3-12. Critical Infrastructure in Contra Costa County............................................................................... 28 Table 3-13. Countywide Planning and Regulatory Capabilities........................................................................ 30 Table 3-14. Administrative and Technical Capabilities..................................................................................... 34 Table 3-15. Financial Resources ...................................................................................................................... 36 Table 3-16. Education and Outreach Resources ............................................................................................. 37 Table 3-17. Current Plan Integration ................................................................................................................ 39 Table 3-18. Potential Future Integration ........................................................................................................... 40 Table 3-19. NFIP Participation Information....................................................................................................... 40 Table 3-20. Floodplain Managers ..................................................................................................................... 42 Table 4-1. Contra Costa County Hazards........................................................................................................... 45 Table 4-2. State and Federal Disaster Declarations for Contra Costa County................................................... 46 Table 4-3. Probability of Occurrence................................................................................................................... 49 Table 4-4. Extent/Intensity Factor ....................................................................................................................... 50 Table 4-5. Catastrophic Factor............................................................................................................................ 50 Table 4-6. Population Exposure Factor............................................................................................................... 51 Table 4-7. Property Exposure Factor.................................................................................................................. 51 Table 4-8. Changes in Development Factor ....................................................................................................... 51 Table 4-9. Population and Life Safety Factor...................................................................................................... 52 Table 4-10. Underserved/Equity Factor............................................................................................................ 52 Table 4-11. Property Damage Factor ............................................................................................................... 53 Table 4-12. Economic Factor............................................................................................................................ 53 Table 4-13. Environmental Factor .................................................................................................................... 54 Table 4-14. Essential Operations Factor .......................................................................................................... 54 Table 4-15. Future Development Factor........................................................................................................... 55 Table 4-16. Climate Change Factor.................................................................................................................. 55 Table 4-17. Risk Index Score for Contra Costa County (FEMA National Risk Index)...................................... 56 Table 4-18. Expected Annual Loss for Contra Costa County (FEMA National Risk Index)............................. 57 Table 4-19. Social Vulnerability for Contra Costa County (FEMA National Risk Index) .................................. 57 Table 4-20. Community Resilience for Contra Costa County (FEMA National Risk Index)............................. 58 Table 4-21. 2024 Hazard Risk Score for Contra Costa County........................................................................ 59

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Contra Costa County, California
Table of Contents ii
Table 4-22. Climate Change Indicators in the United States............................................................................ 62 Table 4-23. IPCC Scenarios ............................................................................................................................. 64 Table 4-24. Climate Change Impacts in California ..................................................................................... 66 Table 4-25. Neighborhoods At Risk Table (Contra Costa County, CA) ........................................................... 71 Table 4-26. Probability of Occurrence .............................................................................................................. 73 Table 4-27. Extent Factors................................................................................................................................ 73 Table 4-28. Vulnerability Factors ...................................................................................................................... 73 Table 4-29. Impact Factors............................................................................................................................... 73 Table 4-30. Climate Change Total Risk Score ................................................................................................. 75 Table 4-31. Dam Failure Types ................................................................................................................... 76 Table 4-32. High Hazard Dams in Contra Costa County.................................................................................. 78 Table 4-33. Additional Dams in Contra Costa County...................................................................................... 80 Table 4-34. Dams Outside of Contra Costa County ......................................................................................... 81 Table 4-35. Dams Within Jurisdiction in Contra Costa County with DSOD Downstream Hazard Potential Classifications ....................................................................................................................................................... 82 Table 4-36. Project Levees in Contra Costa County ........................................................................................ 83 Table 4-37. Non-Project Reclamation District Levees in Contra Costa County ............................................... 83 Table 4-38. USACE Dam Hazard Categories .................................................................................................. 85 Table 4-39. DSOD’s Downstream Hazard Potential Classifications ................................................................ 86 Table 4-40. USACE Levee Safety Action Classification (LSAC) ................................................................ 86 Table 4-41. Dam and Levee Failure Past Events............................................................................................. 88 Table 4-42. Vulnerability and At Risk Population ............................................................................................. 90 Table 4-43. Critical Assets in Vulnerable to Dam Failure................................................................................. 91 Table 4-44. Levee and Vulnerability in the Leveed Area.................................................................................. 91 Table 4-45. 25-Year Precipitation Projections for Contra Costa County .................................................... 98 Table 4-46. Future Climate Indicators for Contra Costa County ...................................................................... 98 Table 4-47. Probability of Occurrence ............................................................................................................ 100 Table 4-48. Extent Factors.............................................................................................................................. 100 Table 4-49. Vulnerability Factors .................................................................................................................... 100 Table 4-50. Impact Factors............................................................................................................................. 100 Table 4-51. Dam and Levee Failure Total Risk Score.................................................................................... 102 Table 4-52. Types of Drought ......................................................................................................................... 103 Table 4-53. Palmer Drought Severity Index.................................................................................................... 104 Table 4-54. U.S. Drought Monitor Classification ............................................................................................ 106 Table 4-55. Drought Annualized Frequency for Contra Costa County (FEMA National Risk Index)............. 108 Table 4-56. Drought Past Events.................................................................................................................... 109 Table 4-57. 25-Year Climate Projections for Contra Costa County................................................................ 113 Table 4-58. Future Climate Indicators for Contra Costa County .................................................................... 114 Table 4-59. Probability of Occurrence ............................................................................................................ 115 Table 4-60. Extent Factors.............................................................................................................................. 115 Table 4-61. Vulnerability Factors .................................................................................................................... 115 Table 4-62. Impact Factors............................................................................................................................. 115 Table 4-63. Drought Expected Annual Loss (FEMA National Risk Index) ..................................................... 117 Table 4-64. Drought Risk Index (FEMA National Risk Index) ........................................................................ 117 Table 4-65. Drought Total Risk Score ............................................................................................................ 118 Table 4-66. Active Faults Within the Contra Costa County Area.................................................................... 120 Table 4-67. Modified Mercalli Scale vs. Richter Scale ................................................................................... 123 Table 4-68. Earthquake Warning California Alerting Thresholds ................................................................... 124 Table 4-69. Earthquake Probabilities for the San Francisco Bay Area (2014 – 2043)................................... 125 Table 4-70. Earthquake Annualized Frequency (FEMA National Risk Index)................................................ 126 Table 4-71. Earthquake Past Events Within or Near Contra Costa County (Magnitude 5.0 or Greater) .. 127 Table 4-72. Disability Characteristics (2022).................................................................................................. 128 Table 4-73. Vulnerability and At Risk Population ........................................................................................... 129 Table 4-74. Physical Housing Characteristics in Contra Costa County ......................................................... 130 Table 4-75. Critical Assets Vulnerable to Earthquakes .................................................................................. 131

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Contra Costa County, California
Table of Contents iii
Table 4-76. Probability of Occurrence ............................................................................................................ 133 Table 4-77. Extent Factors.............................................................................................................................. 133 Table 4-78. Vulnerability Factors .................................................................................................................... 133 Table 4-79. Impact Factors............................................................................................................................. 133 Table 4-80. Contra Costa County Population and Building Value Data......................................................... 135 Table 4-81. Expected Building Damage by Occupancy ................................................................................. 135 Table 4-82. Expected Building Damage by Building Type ............................................................................. 136 Table 4-83. HAZUS Earthquake Expected Damage to Essential Facilities ................................................... 136 Table 4-84. Expected Damage to Utility Systems .......................................................................................... 137 Table 4-85. Expected Damage to the Transportation Systems...................................................................... 137 Table 4-86. Building Related Economic Loss Estimates (Millions of Dollars) ................................................ 138 Table 4-87. HAZUS Earthquake Transportation System Economic Losses (Millions of Dollars) .................. 139 Table 4-88. Earthquake Expected Annual Loss (FEMA National Risk Index)................................................ 140 Table 4-89. Earthquake Risk Index (FEMA National Risk Index)................................................................... 140 Table 4-90. Earthquake Total Risk Score....................................................................................................... 141 Table 4-91. Flood Types ........................................................................................................................... 142 Table 4-92. Contra Costa County Flooding Sources...................................................................................... 143 Table 4-93. NWS Flood Advisories................................................................................................................. 146 Table 4-94. NWS Flash Flood Impact Based Warnings ................................................................................. 146 Table 4-95. NWS River Flood Severity Categories ........................................................................................ 147 Table 4-96. Recurrence Intervals and Probabilities of Occurrences .............................................................. 147 Table 4-97. Riverine Flooding Annualized Frequency (FEMA National Risk Index)...................................... 147 Table 4-98. Contra Costa County Repetitive Loss and Severe Repetitive Loss Properties .......................... 149 Table 4-99. Flood Events (1950 – 2023) ........................................................................................................ 150 Table 4-100. Vulnerability and At Risk Population ........................................................................................... 155 Table 4-101. Critical Assets in the 100-Year and 500-Year Floodplains.......................................................... 156 Table 4-102. 25-Year Precipitation Projections for Contra Costa County .................................................. 159 Table 4-103. Future Climate Indicators for Contra Costa County .................................................................... 159 Table 4-104. Probability of Occurrence ............................................................................................................ 160 Table 4-105. Extent Factors.............................................................................................................................. 160 Table 4-106. Vulnerability Factors .................................................................................................................... 160 Table 4-107. Impact Factors............................................................................................................................. 161 Table 4-108. Contra Costa County Population and Building Value Data......................................................... 163 Table 4-109. 100-Year Flood Expected Building Damage by Occupancy ....................................................... 163 Table 4-110. Expected Building Damage by Building Type ............................................................................. 164 Table 4-111. 100-Year Flood Expected Damage to Essential Facilities .......................................................... 164 Table 4-112. 100-Year Flood Building Related Economic Loss Estimates (Millions of Dollars) ...................... 165 Table 4-113. Riverine Flooding Expected Annual Loss (FEMA National Risk Index)...................................... 166 Table 4-114. Riverine Flooding Risk Index (FEMA National Risk Index)......................................................... 166 Table 4-115. Flooding Total Risk Score ........................................................................................................... 166 Table 4-116. Types of Slope Movement........................................................................................................... 167 Table 4-117. Types of Common Landslide ................................................................................................. 168 Table 4-118. USGS Landslide Advisories ........................................................................................................ 171 Table 4-119. Landslide Annualized Frequency (FEMA National Risk Index)................................................... 171 Table 4-120. Significant Landslide Events........................................................................................................ 172 Table 4-121. Vulnerability and At Risk Population ........................................................................................... 174 Table 4-122. Critical Assets Vulnerable to Landslides ..................................................................................... 175 Table 4-123. 25-Year Climate Projections for Contra Costa County .......................................................... 177 Table 4-124. Probability of Occurrence ............................................................................................................ 178 Table 4-125. Extent Factors.............................................................................................................................. 178 Table 4-126. Vulnerability Factors .................................................................................................................... 178 Table 4-127. Impact Factors............................................................................................................................. 178 Table 4-128. Landslide Expected Annual Loss (FEMA National Risk Index)................................................... 180 Table 4-129. Landslide Risk Index (FEMA National Risk Index)...................................................................... 180 Table 4-130. Landslide Total Risk Score.......................................................................................................... 181

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Contra Costa County, California
Table of Contents iv
Table 4-131. Projected Sea Level Rise for San Francisco............................................................................... 184 Table 4-132. Probability that Sea level Rise Will Meet or Exceed a Particular Height in San Francisco (High Emissions – RCP 8.5)............................................................................................................................................ 186 Table 4-133. Probability that Sea level Rise Will Meet or Exceed a Particular Height in San Francisco (Low Emissions – RCP 2.6)............................................................................................................................................ 186 Table 4-134. Coastal Flooding Annualized Frequency (FEMA National Risk Index)....................................... 186 Table 4-135. Vulnerability and At Risk Population ........................................................................................... 187 Table 4-136. Critical Assets in Vulnerable to 1 Foot of Sea Level Rise ........................................................... 189 Table 4-137. Probability of Occurrence ............................................................................................................ 192 Table 4-138. Extent Factors.............................................................................................................................. 192 Table 4-139. Vulnerability Factors .................................................................................................................... 192 Table 4-140. Impact Factors............................................................................................................................. 192 Table 4-141. Coastal Flooding Expected Annual Loss (FEMA National Risk Index)....................................... 194 Table 4-142. Coastal Flooding Risk Index (FEMA National Risk Index).......................................................... 194 Table 4-143. Sea Level Rise Total Risk Score................................................................................................. 195 Table 4-144. Hail Speed Estimates .................................................................................................................. 196 Table 4-145. Types of Strong Winds ................................................................................................................ 197 Table 4-146. Types of Tornadoes..................................................................................................................... 198 Table 4-147. Converting Traditional Hail Size Descriptions ............................................................................. 203 Table 4-148. Beaufort Wind Scale.................................................................................................................... 204 Table 4-149. Enhanced Fujita Scale................................................................................................................. 205 Table 4-150. NWS HeatRisk Categories .......................................................................................................... 205 Table 4-151. Atmospheric River Scale ............................................................................................................. 206 Table 4-152. NWS Severe Weather Advisories................................................................................................ 206 Table 4-153. NWS Excessive Heat Advisories................................................................................................. 207 Table 4-154. Hail Annualized Frequency (FEMA National Risk Index)............................................................ 208 Table 4-155. Strong Wind Annualized Frequency (FEMA National Risk Index) .............................................. 208 Table 4-156. Tornado Annualized Frequency (FEMA National Risk Index)..................................................... 208 Table 4-157. Heat Wave Annualized Frequency (FEMA National Risk Index) ................................................ 209 Table 4-158. Strong Winds Events (1950 – 2023) ........................................................................................... 209 Table 4-159. Tornado Events (1950 – 2023).................................................................................................... 213 Table 4-160. Heavy Rainfall Past Events ......................................................................................................... 214 Table 4-161. Heat Events (1950 – 2023).......................................................................................................... 215 Table 4-162. Vulnerability and At Risk Population ........................................................................................... 219 Table 4-163. Critical Assets Vulnerable to Severe Weather ............................................................................ 221 Table 4-164. Probability of Occurrence ............................................................................................................ 224 Table 4-165. Extent Factors.............................................................................................................................. 224 Table 4-166. Vulnerability Factors .................................................................................................................... 225 Table 4-167. Impact Factors............................................................................................................................. 226 Table 4-168. Hail Expected Annual Loss (FEMA National Risk Index)............................................................ 229 Table 4-169. Strong Wind Expected Annual Loss (FEMA National Risk Index) .............................................. 229 Table 4-170. Tornado Expected Annual Loss (FEMA National Risk Index)..................................................... 229 Table 4-171. Riverine Flooding Expected Annual Loss (FEMA National Risk Index)...................................... 230 Table 4-172. Heat Wave Expected Annual Loss (FEMA National Risk Index) ................................................ 230 Table 4-173. Hail Risk Index (FEMA National Risk Index)............................................................................... 230 Table 4-174. Strong Wind Risk Index (FEMA National Risk Index) ................................................................. 231 Table 4-175. Tornado Wind Risk Index (FEMA National Risk Index) .............................................................. 231 Table 4-176. Riverine Flooding Risk Index (FEMA National Risk Index)......................................................... 231 Table 4-177. Heat Wave Risk Index (FEMA National Risk Index) ................................................................... 231 Table 4-178. Severe Weather Total Risk Score ............................................................................................... 232 Table 4-179. Papadopoulos and Imamura Tsunami Scale .............................................................................. 235 Table 4-180. National Tsunami Warning Center Alerts .................................................................................... 237 Table 4-181. Tsunami Annualized Frequency (FEMA National Risk Index) .................................................... 237 Table 4-182. Tsunami Events (1950 – 2023) ................................................................................................... 238 Table 4-183. Vulnerability and At Risk Population ........................................................................................... 239

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2024 Hazard Mitigation Plan
Contra Costa County, California
Table of Contents v
Table 4-184. Critical Assets Vulnerable to Tsunami......................................................................................... 241 Table 4-185. Probability of Occurrence ............................................................................................................ 243 Table 4-186. Extent Factors.............................................................................................................................. 243 Table 4-187. Vulnerability Factors .................................................................................................................... 243 Table 4-188. Impact Factors............................................................................................................................. 243 Table 4-189. Tsunami Expected Annual Loss (FEMA National Risk Index) .................................................... 245 Table 4-190. Tsunami Risk Index (FEMA National Risk Index) ....................................................................... 245 Table 4-191. Tsunami Total Risk Score ........................................................................................................... 246 Table 4-192. Types of Wildfires ........................................................................................................................ 247 Table 4-193. Air Quality Index for Ozone and Particle Pollution ...................................................................... 250 Table 4-194. National Weather Service Fire Advisories................................................................................... 250 Table 4-195. Wildfire Annualized Frequency (FEMA National Risk Index)...................................................... 251 Table 4-196. Wildfire Events (1950 – 2023)..................................................................................................... 251 Table 4-197. Critical Assets in Vulnerable to Wildfire....................................................................................... 256 Table 4-198. 25-Year Climate Projections for Contra Costa County................................................................ 258 Table 4-199. Future Climate Indicators for Contra Costa County .................................................................... 259 Table 4-200. Probability of Occurrence ............................................................................................................ 260 Table 4-201. Extent Factors.............................................................................................................................. 260 Table 4-202. Vulnerability Factors .................................................................................................................... 260 Table 4-203. Impact Factors............................................................................................................................. 260 Table 4-204. Wildfire Expected Annual Loss (FEMA National Risk Index)...................................................... 262 Table 4-205. Wildfire Risk Index (FEMA National Risk Index) ......................................................................... 262 Table 4-206. Wildfire Total Risk Score ............................................................................................................. 263 Table 4-207. Common Types of Cyberattacks ................................................................................................. 265 Table 4-208. Counterterrorism Objectives........................................................................................................ 266 Table 4-209. Cybersecurity Total Risk Score ................................................................................................... 269 Table 4-210. Hazardous Materials Incident Types ........................................................................................... 270 Table 4-211. Hazardous Materials Incidents (Reported to CalOES)................................................................ 272 Table 4-212. Hazardous Materials Incidents Total Risk Score......................................................................... 274 Table 4-213. Utility Interruption Past Events .................................................................................................... 277 Table 4-214. Utility Interruptions Total Risk Score ........................................................................................... 278 Table 4-215. Active Shooter Total Risk Score.................................................................................................. 281 Table 4-216. Terrorism Total Risk Score.......................................................................................................... 284 Table 5-1. Contra Costa County Mitigation Goals and Objectives ................................................................... 285 Table 5-2. Contra Costa County Mitigation Actions Summary ......................................................................... 287 Table 5-3. Mitigation Action Estimated Cost Parameters ................................................................................. 288 Table 5-4. Mitigation Action Benefits Parameters............................................................................................. 288 Table 5-5. Mitigation Action Project Duration Parameters................................................................................ 288 Table 5-6. Existing Mitigation Action Priority Parameters................................................................................. 289 Table 5-7. STAPLEE+E Method ....................................................................................................................... 289 Table 5-8. New Mitigation Action Priority Parameters ...................................................................................... 291 Table 6-1. Five-Year Action Plan ...................................................................................................................... 297 Table 6-2. Contra Costa County Mitigation Actions Summary ......................................................................... 299

LIST OF FIGURES
Figure 3-1. Contra Costa County Planning Area ............................................................................................. 14 Figure 3-2. Topographical Map........................................................................................................................ 16 Figure 3-3. Land Use Map ............................................................................................................................... 19 Figure 3-4. Existing Development in Unincorporated Contra Costa County Flood Zones ......................... 21 Figure 3-5. Impacted Communities.................................................................................................................. 26 Figure 3-6. Critical Infrastructure in Contra Costa County............................................................................... 29 Figure 4-1. Global Temperature Trends (1993 – 2022) ............................................................................. 63 Figure 4-2. Projected Annual Global Carbon Emissions ................................................................................. 65 Figure 4-3. Projected Global Temperatures..................................................................................................... 65

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2024 Hazard Mitigation Plan
Contra Costa County, California
Table of Contents vi
Figure 4-4. Temperature and Atmospheric CO2 Variation the Past 400,000 Years ........................................ 67 Figure 4-5. Global Average Surface Temperature (1880 – 2022)................................................................... 67 Figure 4-6. High and Significant Hazard Dams in the Contra Costa County Area .......................................... 80 Figure 4-7. Dams Inundation Areas in the Contra Costa County Area............................................................ 81 Figure 4-8. Levee Systems in Contra Costa County Area............................................................................... 84 Figure 4-9. Palmer Drought Severity Index Map (March 2024)..................................................................... 105 Figure 4-10. California U.S. Drought Monitor (April 9, 2024)........................................................................... 107 Figure 4-11. U.S. Drought Monitor for Contra Costa County ..................................................................... 108 Figure 4-12. Faults Located in the San Francisco Bay Region ....................................................................... 121 Figure 4-13. Earthquake History in Contra Costa County Area....................................................................... 122 Figure 4-14. USGS National Seismic Hazard Map.......................................................................................... 126 Figure 4-15. Contra Costa County Floodplain ................................................................................................. 145 Figure 4-16. Landslide Susceptibility in Contra Costa County......................................................................... 170 Figure 4-17. Expected Sea Level Rise 2050 Projection .................................................................................. 183 Figure 4-18. Expected Sea Level Rise 2100 Projection .................................................................................. 184 Figure 4-19. National Weather Service Heat Index Chart ............................................................................... 199 Figure 4-20. Contra Costa County Hail History (1950 – 2023)........................................................................ 200 Figure 4-21. Contra Costa County Strong Wind History (1950 – 2023) .......................................................... 201 Figure 4-22. Contra Costa County Tornado History (1950 – 2023)................................................................. 202 Figure 4-23. SPC Severe Thunderstorm Outlook Categories ......................................................................... 203 Figure 4-24. Contra Costa County Tsunami Hazard Areas............................................................................. 234 Figure 4-25. Contra Costa County Fire Hazard Severity Zones...................................................................... 248 Figure 4-26. Contra Costa County Wildland-Urban Interface.......................................................................... 249 Figure 4-27. Contra Costa County Historic Wildfire Perimeters ...................................................................... 253

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2025 Urban Water Management Plan
I
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.

Appendix I: Model Water Efficient Landscape
Ordinance and Municipal Landscape and Screening

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2025 Urban Water Management Plan Appendix I
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Brentwood City CouncilMay 26, 2026

Brentwood City Council
May 26, 2026