Part 1 Operations, Facilities & Costs January February 4, 2003

2 Meeting Purpose & Agenda Meeting Purpose –Review and discuss a potential CALFED Los Vaqueros Reservoir expansion project -- the facilities required and how it would operate Agenda –2003 Studies: Information and Schedule –Current Delta Operations –Los Vaqueros Reservoir Expansion Operations CCWD and Bay Area Water Quality and Reliability Delta Enhancement –Facilities, Construction Schedule, and Costs

3 Meeting Guidelines Ensure Everyone's Participation –One speaker at a time –Minimize side conversations Honor Our Time Limits –Keep comments concise and avoid redundancy – Use ditto to agree with others Commit to Being Fully Present –No cell phones, pagers, voic , etc. –Ask for what you need from the meeting process Respect Each Other –Listen carefully to other participants and try other opinions on for size –Respond to ideas and issues, not individuals Identify Yourself –State your name and organization or community

Study Activities Extensive public outreach –Now through June 2003 Provide facts & information Key dates –CCWD Board decision -- July 2003 –Potential vote -- November 2003 Where we are now….

5 Public Workshops Today’s Discussion –Potential Project -- How would an expanded reservoir operate, what facilities are needed, and what would they cost? Future Workshops –Part 2 -- Partners, Benefits & Payments – benefits to CCWD, CALFED, and Bay Area water agencies; potential organizational structure and agreements among partners –Part 3 -- Environmental Effects & Mitigation – Impacts and strategies for addressing potential adverse effects –Part 4 -- Review of CCWD Principles and responses to comments

Information Available Now OPERATIONS Delta Water System - How the Delta water system works and how an expanded reservoir would operate with other partners Potential Partners - List of potential partners, their needs, and the benefits an expanded reservoir could provide them Water Rights - Description of water rights changes needed Water Quality - Benefits for CCWD and other Bay Area water agencies Reliability - Benefits for CCWD and other Bay Area water agencies Delta Environment - Environmental benefits for the Delta FACILITIES & COSTS Delta Intakes - Size of facilities, possible facility layouts for fish screens, and pumping capacity Pipelines - Capacity, corridors, and length Dam - Size, location, safety features, construction schedule, reservoir inundation area, and interim water supply plan Cost Estimates - Planning level construction and operation & maintenance costs OPERATIONS Delta Water System - How the Delta water system works and how an expanded reservoir would operate with other partners Potential Partners - List of potential partners, their needs, and the benefits an expanded reservoir could provide them Water Rights - Description of water rights changes needed Water Quality - Benefits for CCWD and other Bay Area water agencies Reliability - Benefits for CCWD and other Bay Area water agencies Delta Environment - Environmental benefits for the Delta FACILITIES & COSTS Delta Intakes - Size of facilities, possible facility layouts for fish screens, and pumping capacity Pipelines - Capacity, corridors, and length Dam - Size, location, safety features, construction schedule, reservoir inundation area, and interim water supply plan Cost Estimates - Planning level construction and operation & maintenance costs

7 CCWD Principles for Participation The project improves water quality and reliability for CCWD The project enhances the Delta environment The project protects and enhances the fisheries and terrestrial species benefits provided by the existing Los Vaqueros Project The project preserves and increases the recreational opportunities of the Los Vaqueros Project CCWD must maintain control of watershed and operation of the reservoir The project protects and reimburses the financial investment made by the CCWD customers who financed the existing $450 million Los Vaqueros Project The proposal would be placed before the voters of the Contra Costa Water District

8 Project Overview CALFED is studying whether an expanded Los Vaqueros Reservoir can meet CALFED and Bay Area water agencies’ objectives Water Quality Reliability Environmental Enhancement Expansion from 100,000 acre-feet up to 500,000 acre-feet maximum capacity

9 What are Important Water Quality Parameters? Salts –From seawater intrusion or other discharges -- Cause taste and corrosion problems; impede water recycling Organics and Bromide –Harmful chemical by-products can be formed when water is disinfected Pathogens (bacteria or viruses) –From runoff, discharges, or human activities -- Treated with filters and disinfection

10 What is Reliability? Emergency Storage –Storing water to protect against a disaster (earthquake, power failure, levee failure, pipeline failure, or chemical spill) Drought Storage –Storing water in wet years for use during dry years Flexibility –Ability to stop Delta diversions to protect fish without disrupting water users

11 Environmental Water Improves Fisheries & Habitat Environmental Water Account (EWA) –Integral part of CALFED Program to restore the Delta –Like a bank account: Assets controlled by fisheries agencies to enhance Delta fisheries and habitat Protecting fish by shutting off pumps (changing the timing of diversions) Providing flows to enhance fisheries Assets can include water, storage, conveyance capacity, and operational flexibility Federal Wildlife Refuges –Water supply to 10 wildlife refuges in the San Joaquin Valley In-stream Flows –Water supply to provide stream flows for fish at critical times

12 Bay Area Water Agencies

13 Delta Water Diversion Facilities

14 Bay Area Water Use Potential Partners Bay Area Water Agencies Use a Small Piece of the Delta Water System

15 Existing Los Vaqueros Project Provides Emergency Storage –Protects against a catastrophe in the Delta Improves Water Quality –Changes the timing and location of diversions –Stores water for blending when Delta water quality is poor Enhances Delta Environment –State-of-the-art fish screens –Flexible timing and location of diversion

16 Existing Los Vaqueros Project Old River Intake Facility Contra Costa Canal Los Vaqueros Reservoir & Watershed CCWD Service Area Rock Slough Intake Facility

17 Existing Los Vaqueros Project Typical annual Los Vaqueros operation Reservoir Level (thousand acre-feet) HIGH Delivered Water Quality JanuaryJuly December a a HIGHLOW Delta Water Quality CHANGE FILL STOP FILL / RELEASE FOR FISH FILL HOLD Action at Reservoir HOLD RELEASE Reservoir level depends on year type (dry, wet) Reserved for Emergency

18 Existing Los Vaqueros Project Without Blending from Los Vaqueros With Blending from Los Vaqueros Chlorides (parts per million) Storage in Los Vaqueros Reservoir lowered chlorides delivered to CCWD customers 1999

19 Existing Los Vaqueros Project Fisheries agencies concluded that the Los Vaqueros Project improved the Delta environment for current and future CCWD diversions

20 Questions and Discussion Workshop Process and Public Review Project Purposes and CALFED Goals Improve Bay Area water quality and reliability Enhance Delta environment Current Operations –Delta Operations Water Quality Reliability Delta Enhancement –Existing Los Vaqueros Project

21 Meeting Agenda Agenda –2003 Studies Activities and Available Information –Current Delta Operations –Los Vaqueros Expansion Operations Operating Scenarios CCWD and Bay Area Water Quality and Reliability Delta Enhancement –Facilities, Construction Schedule, and Costs

22 Operating Scenarios Developed full range of possible ways to operate an expanded reservoir –Environmental water priority –Bay Area reliability priority –Multi-purpose (combination) Compared to future conditions without an expansion Determined there are projects that could meet CALFED objectives and CCWD Principles

23 Operating Scenarios Constraints Delta Protection –Operate within all regulatory requirements –Use only surplus flow and existing water rights / contracts to fill reservoir Fishery Protection: conservative –Assumed two month “no-fill” period in spring for fish protection –Operate within all fish protections measures Protection for Other Users –No injury to water right holders or contractors Analyzed 70 years of rainfall patterns –Including critically dry (1977) and extended drought ( and ) years

24 Opportunities to Fill an Expanded Reservoir Best Water Quality - Best Time to Fill Reservoir Possible pumping restrictions to protect fish

25 Operating Scenarios Single-Purpose Scenarios Future w/o Expansion Environmental –EWA Program uses reservoir capacity to deliver SBA water –EWA Program uses flexibility to shut down export pumps to protect fish Reliability –Reservoir stores water for use in dry years by SBA agencies CCWD WQ CCWD ES CCWD WQ CCWD ES DROUGHT STORAGE & WQ CCWD WQ CCWD ES ENV. WATER & WQ CCWD WQ CCWD ES ENV. WATER & WQ CCWD ES

26 Operating Scenarios Multi-purpose Scenarios Drought Storage & Environmental Water –Reservoir stores water for use in dry years by SBA agencies –EWA Program uses reservoir capacity to deliver SBA water –EWA Program uses flexibility to shut down export pumps to protect fish Federal Benefits –Federal agency uses reservoir capacity to deliver SBA water –Federal agency uses flexibility to shut down export pumps to protect fish provide water supplies for wildlife refuges CCWD WQ DROUGHT STORAGE CCWD DROUGHT STORAGE CCWD ES ENV. WATER & WQ CCWD WQ CCWD ES ENV. WATER & WQ DROUGHT STORAGE CCWD WQ CCWD ES ENV. WATER & WQ DROUGHT STORAGE CCWD ES

27 Drinking Water Quality Benefits Major Findings –Water Quality All scenarios would improve drinking water quality for CCWD All scenarios would improve drinking water quality for Bay Area agencies served by the South Bay Aqueduct

28 Drinking Water Quality Benefits As the state continues to grow there will be increased pressure on the Delta and declining water quality Expanded Los Vaqueros Reservoir would improve water quality for CCWD and Bay Area water agencies –New intakes would reduce salts and bromide –Larger intakes allow faster reservoir filling when quality is better –Deeper reservoir with multiple intakes reduces organics These improvements result in –Reduced public health risks –Improved taste – customer satisfaction –Reduced treatment costs and improved ability to meet existing and future water quality regulations

29 Drinking Water Quality Benefits for CCWD More high quality water delivered to CCWD customers during extended droughts Before the existing reservoir, CCWD could not provide high quality water during droughts or in any dry periods –No water available for blending With the existing reservoir, CCWD can deliver high quality water through a 3-year drought With an expansion, CCWD could deliver high quality water through a 6-year drought

30 Future Conditions without an Expansion Without Expansion Drinking Water Quality Benefits for CCWD CCWD can improve water quality delivered to customers with an expansion WetNormalDryExtended Dry

31 Without Expansion With Expansion Drinking Water Quality Benefits for CCWD CCWD can improve water quality delivered to customers with an expansion Water Quality Improvement for CCWD WetNormalDryExtended Dry

32 Benefits to Potential Partners Water Quality An expanded reservoir could reduce the times that South Bay Aqueduct agencies taste salts in the water An expanded reservoir would reduce the maximum day salt levels –Now: 250 ppm –With expansion: 150 ppm Future without an Expansion Future with an Expansion Percent of time delivered water would exceed 100 ppm Chlorides

33 Reduced Daily Variability for Potential Partners Source: ACWD –Los Vaqueros would be deeper pool than Clifton Court Reduced temperature variation Reduced algae blooms Reduced pH variation –Improved quality of deliveries to treatment plants means: Improved treatment stability Decreased cost An expanded Los Vaqueros Reservoir would reduce variation in deliveries to treatment plants NightDayNightDayNightDayNightDay

34 Reliability Benefits Major Findings –An expanded Los Vaqueros Reservoir could be operated to provide more reliable water supplies 60,000 to 120,000 acre-feet of water in drought years for CCWD (as alternative to current drought year plans) 110,000 to 300,000 acre-feet of water to South Bay Aqueduct agencies in drought years

35 Spot Purchases & Drought Mgmt Reliability Benefits for CCWD Single Dry Year Multi-Year Drought CVP Contract (Federal) Purchases Expanded Los Vaqueros could reduce the need for spot purchases and rationing in dry periods (with higher quality) CVP Contract (Federal) Future Demand Other (e.g. Recycling) Other (GW) Other (e.g. Recycling) Future Need Conservation Voluntary Conservation Purchases Voluntary Conservation Normal Year CVP Contract (Federal) Purchases Other (e.g. Recycling) Conservation How water needs are met in normal and dry years

36 Expanded Los Vaqueros could provide this water (with higher quality) Spot Purchases & Drought Mgmt Reliability Benefits for Potential Partners Single Dry Year Multi-Year Drought Contract Sources Local Storage Contract Sources Future Demand Other (e.g. Recycling) Other (e.g. Recycling) Future Need Conservation Voluntary Conservation Local Storage Voluntary Conservation Normal Year Contract Sources Local Storage Other (e.g. Recycling) Conservation Non-local Storage How water needs are met in normal and dry years

37 0% 20% 40% 60% 80% 100% 0%20%40%60%80%100% Percent of Time At or Above Percent of Contract Amount South Bay Aqueduct (SBA) Reliability (SWP Delta Water Delivery Study 2021B) SBA SWP Contracts (1,000 AF/YR) WET YEARS WET YEARS DRY YEARS DRY YEARS SBA Agencies Contract for 220,000 acre-feet/year of Water from the State Water Project NORMAL YEARS NORMAL YEARS CRITICALLY DRY YEARS CRITICALLY DRY YEARS

38 0% 20% 40% 60% 80% 100% 0%20%40%60%80%100% South Bay Aqueduct (SBA) Reliability (SWP Delta Water Delivery Study 2021B) SBA SWP Contracts (1,000 AF/YR) SWP Availability Reliable Supply State Water Project Provides Full Contract Amount Only in the Wet Years Percent of Contract Amount Percent of Time At or Above WET YEARS WET YEARS DRY YEARS DRY YEARS NORMAL YEARS NORMAL YEARS CRITICALLY DRY YEARS CRITICALLY DRY YEARS

39 0% 20% 40% 60% 80% 100% 0%20%40%60%80%100% South Bay Aqueduct (SBA) Reliability (SWP Delta Water Delivery Study 2021B) SBA SWP Contracts (1,000 AF/YR) SWP Availability Reliable Supply Repeat of 1987 to 1992 Drought = 40% Supply In Dry Years SBA Agencies Could Get 40% of Their Contract Amount Percent of Contract Amount Percent of Time At or Above WET YEARS WET YEARS DRY YEARS DRY YEARS NORMAL YEARS NORMAL YEARS CRITICALLY DRY YEARS CRITICALLY DRY YEARS

40 0% 20% 40% 60% 80% 100% 0%20%40%60%80%100% South Bay Aqueduct (SBA) Reliability (SWP Delta Water Delivery Study 2021B) SBA SWP Contracts (1,000 AF/YR) SWP Availability Reliable Supply Repeat of 1987 to 1992 Drought = 40% Supply Repeat of 1977 Critical Dry Year - 20% Supply In Critically Dry Years SBA Agencies Could Only Get 20% of Their Contract Amount Percent of Contract Amount Percent of Time At or Above WET YEARS WET YEARS DRY YEARS DRY YEARS NORMAL YEARS NORMAL YEARS CRITICALLY DRY YEARS CRITICALLY DRY YEARS

41 0% 20% 40% 60% 80% 100% 0%20%40%60%80%100% South Bay Aqueduct (SBA) Need for SWP Water (SWP Delta Water Delivery Study 2021B) SBA SWP Contracts (1,000 AF/YR) SBA Agencies Average Need for SWP Water SBA Agencies Have Excess Water in Wet Years and a Supply Gap in Dry Years Supply Gap Supply Gap Excess Water Available Percent of Contract Amount Percent of Time At or Above WET YEARS WET YEARS DRY YEARS DRY YEARS NORMAL YEARS NORMAL YEARS CRITICALLY DRY YEARS CRITICALLY DRY YEARS Conservation/Other SWP Availability

42 0% 20% 40% 60% 80% 100% 0%20%40%60%80%100% Potential Drought Protection Benefits for SBA Agencies (Averages 25,000 AF/year) (SWP Delta Water Delivery Study 2021B) SBA SWP Contracts (1,000 AF/YR) SWP Availability SBA Needs for SWP Water Deliver Water From Delta to Storage SWP Water is Available, In Wet Years, to Put into Storage Supply Gap Supply Gap Percent of Contract Amount Percent of Time At or Above WET YEARS WET YEARS DRY YEARS DRY YEARS NORMAL YEARS NORMAL YEARS CRITICALLY DRY YEARS CRITICALLY DRY YEARS

43 0% 20% 40% 60% 80% 100% 0%20%40%60%80%100% Potential Drought Protection Benefits for SBA Agencies (SWP Delta Water Delivery Study 2021B) SBA SWP Contracts (1,000 AF/YR) SWP Availability SBA Needs for SWP Water Deliver Water From Delta to Storage Deliver Water From Storage to SBA Deliver Water From Storage to SBA Expanded Los Vaqueros Reservoir could provide up to 110,000 AF in a critically dry year and up to 300,000 AF in an extended drought Percent of Contract Amount Percent of Time At or Above WET YEARS WET YEARS DRY YEARS DRY YEARS NORMAL YEARS NORMAL YEARS CRITICALLY DRY YEARS CRITICALLY DRY YEARS

44 Potential Benefits Delta Enhancement Expanded Los Vaqueros Reservoir Enhances Delta Environment – Reduces impacts to fisheries from existing SBA Diversion State-of-the-art fish screens Flexible timing of diversion – Creates storage and flexibility for Environmental Water that could allow Shut downs at state and federal pumps when fish are present (up to 158,000 acre-feet per year) Water for wildlife refuges Water for in-stream flows upstream of Delta

45 Potential Benefits Delta Enhancement Existing State Pumps –High volume –No outlet for fish –High fish losses Existing & Potential Los Vaqueros Diversions –Low volume and velocity –Fish can swim past screens –Very low fish losses Fish Screen

46 Potential Benefits Delta Enhancement Expanded Reservoir creates opportunity to store Environmental Water – EWA owns capacity in an expanded Los Vaqueros Reservoir – Fill reservoir when no fish are near pumps and water quality is good – Normal export pumping – Deliveries to South Bay agencies out of Los Vaqueros Reservoir When Fish are not Present

47 Potential Benefits Delta Enhancement Expanded Reservoir Creates Opportunity for Environmental Water – No filling Los Vaqueros – Deliveries to South Bay agencies out of Los Vaqueros Reservoir – EWA reduces or stops export pumps When Fish are near Pumps

48 Potential Benefits Conclusions An expanded Los Vaqueros Reservoir could meet CCWD Principles 1 & 2 –The project improves water quality and reliability for CCWD –The project enhances the Delta environment The project could meet CALFED objectives –Provide substantial water quality and reliability benefits for Bay Area water agencies, including CCWD –Provide state and federal resource agencies with water for the environment

49 Questions and Discussion Expanded Los Vaqueros Reservoir Operations –Operating Scenarios –Range of Benefits for CCWD and Potential Partners Improve Bay Area water quality and reliability Enhance Delta environment

50 Meeting Agenda Agenda –2003 Studies Activities and Available Information –Current Delta Operations and CALFED Goals –Los Vaqueros Reservoir Expansion Operations –Facilities, Construction Schedule, and Costs Delta Intakes and Fish Screens Pumps and Pipelines Dam and Watershed Estimated Costs

51 Potential Facilities for an Expansion Project Delta Intake and Conveyance Delta-Los Vaqueros Pipeline & Pump Station LV-SBA Pump Station & Pipeline Dam and Recreation

52 Delta Intakes 1-3 intakes on Old River 250 or 500 cfs each Approximately 1-2 acres each 1-4 intakes on Middle River 250 or 500 cfs each Approximately 1-2 acres each

53 Delta Intakes and Fish Screens Fish Screen Water Flow

54 Pumps and Pipelines New Delta Pump Station to fill reservoir 25 acre site 1,000 to 1,750 cfs New pumps & pipeline to deliver water to South Bay Aqueduct (SBA) 7 miles Up to 8 ft. diameter 430 cfs (same as SBA capacity) New pipeline(s) to fill reservoir 9 miles, mostly in existing right- of-way Up to 12 ft. diameter

55 Dam & Watershed New dam upstream of existing dam – Materials reused from existing dam – New materials from within reservoir area – 13 acre staging area downstream of dam

56 Dam Construction Schedule 4 years of dam construction Range of Sizes Reservoir Capacity (thousands of acre-feet) Dam Height (FT) Dam Crest Length (FT) 1,850 2,300 Volume (million cubic yards)

57 Dam Construction Dam Safety Constructed to withstand maximum credible earthquake Redundant safety features Continuously monitored for safety

58 Recreation Facility Site Options Recreation facilities will be replaced and enhanced –The Marina –Fishing Piers –The Interpretive Center –Picnic Areas –Trails Many options identified for facility locations –Details to be presented in Part 3 (April)

59 Project Cost Estimate Cost includes the size of project elements: –Intake Facilities –Pipeline/Pumping Facilities –New Dam/Reservoir Facilities

60 Project Cost Estimate Cost Estimate

61 Construction Schedule Interim water supply from Middle River during dam construction

62 Questions and Discussion Facilities and Costs –Delta Intakes –Pumps and Pipelines –Dam and Watershed –Project Costs & Schedule

63 Available Information On project web site: In libraries and city offices in CCWD service area –See web site for list of locations On CD by request

64 Contact Information Marguerite Naillon Project Manager CALFED Los Vaqueros Reservoir Expansion Studies 2300 Stanwell Drive P.O. Box H2O Concord, CA Phone: (925)

65 Next Steps Comments on Today’s Discussion –Due February 14th by or regular mail Future Workshops (see handout with schedule & locations) –Early March -- Partners, Benefits, and Payments -- Value of benefits and institutional issues –Mid-April -- Environmental Effects & Mitigation -- Strategies for addressing potential adverse effects –Late May -- Summary and Response to Comments -- Review of CCWD Principles and answers to comments and issues

Information Available in March 2003 PARTNERS, BENEFITS & PAYMENTS Reimbursement - Amount other partners would need to reimburse CCWD for shared facilities Benefits - Value of benefits for CCWD and potential partners (water quality, reliability, environmental, other) Institutional - Models for how other similar projects are owned and operated by participating agencies Financing - Financing costs and methods PARTNERS, BENEFITS & PAYMENTS Reimbursement - Amount other partners would need to reimburse CCWD for shared facilities Benefits - Value of benefits for CCWD and potential partners (water quality, reliability, environmental, other) Institutional - Models for how other similar projects are owned and operated by participating agencies Financing - Financing costs and methods Early March