2012 06-13 draft facilities planning report

1. DRA AFTFEAS SIBILITY STUD & FAYDY ACILITIE PLA ESANNING REPOGORTTOW OF YOUNTVILWN YLLE RECY YCLED W WATER EXXPANSIO PROJEONECT YOUNNTVILLE, C CALIFOR RNIAJune 2 2012 Prepared for:dMr. Graham Wadsworth PE h,Tow of Younwnntville 6550 Yount SStreetYountv ville, CA 944599Prepared by: d 223 Mercury Way, Suite 150 35 eSanta RRosa, CA 955407 (707) 523-1010

2. DRAFTFEASIBILITY STUDY & FACILITIES PLANNING REPORTTOWN OF YOUNTVILLE RECYCLED WATER EXPANSION PROJECTYOUNTVILLE, CALIFORNIAProject No. 12027-11001-37020Prepared for:Mr. Graham WadsworthTown of Yountville6550 Yount StreetYountville, CA 94599Prepared by:____________________________________Reviewed by:___________________________________2235 Mercury Way, Suite 150Santa Rosa, CA 95407(707) 523-1010June 2012

3. Contents1.EXECUTIVE SUMMARY ................................................................................... 1 1.1 BENEFITS OF THE RECYCLED WATER PLAN...............................................................1 1.2 FACILITY PLANNING CONSIDERATIONS .......................................................................1 1.3 RECOMMENDED PROJECT .............................................................................................22.INTRODUCTION ............................................................................................... 3 2.1 BACKGROUND AND PROJECT PURPOSE.....................................................................3 2.2 STUDY AREA .....................................................................................................................4 2.3 PLANNING PROCESS .......................................................................................................42.3.1 WORKSHOPS AND PUBLIC OUTREACH ..................................................................... 4 2.4 DOCUMENT ORGANIZATION ..........................................................................................53.PROBLEMS AND NEEDS ................................................................................. 6 3.1 STUDY AREA CHARACTERISTICS .................................................................................63.1.1 HYDROLOGIC CHARACTERISTICS AND AMBIENT WATER QUALITY ...................... 63.1.2 LAND USE TRENDS AND POPULATION PROJECTIONS ............................................ 7 3.2 WATER SUPPLY ...............................................................................................................73.2.1 RECTOR RESERVOIR ................................................................................................... 73.2.2 STATE WATER PROJECT WATER SUPPLY................................................................. 83.2.3 GROUNDWATER ............................................................................................................ 83.2.4 RECYCLED WATER ....................................................................................................... 93.2.5 WATER DEMAND TRENDS............................................................................................ 93.2.6 SOURCES FOR ADDITIONAL WATER AND PLANS FOR NEW FACILITIES ............... 93.2.7 WATER SUPPLY AND DEMAND BALANCE .................................................................. 9 3.3 WASTEWATER TREATMENT & DISPOSAL ..................................................................103.3.1 EXISTING WATER RECYCLING AND EFFLUENT RIGHTS ........................................ 11 3.4 ENVIRONMENTAL WATER.............................................................................................114.WATER REUSE OPPORTUNITIES (MARKET ASSESSMENT) ..................... 12 4.1 IDENTIFICATION OF POTENTIAL CUSTOMERS ..........................................................12 4.2 DEMAND DEVELOPMENT ..............................................................................................14 4.3 SUMMARY OF MARKET ASSESSMENT RESULTS ......................................................185.PROJECT ALTERNATIVES ............................................................................ 19 5.1 ENGINEERING ANALYSIS FOR ALTERNATIVE COMPONENTS ................................195.1.1 RECYCLED WATER SUPPLY AND WATER BALANCE .............................................. 19Town of Yountville GHD 12027-11001-32204DRAFT Feasibility Study & Facilities Planning Report i June 2012

4. 5.1.2TREATMENT SYSTEM CAPACITY .............................................................................. 235.1.3PUMPING AND DELIVERY RATE ................................................................................ 245.1.4DISTRIBUTION SYSTEM CAPACITY ........................................................................... 24 5.2 COST ASSUMPTIONS ....................................................................................................25 5.3 ALTERNATIVE DESCRIPTIONS .....................................................................................265.3.1ALTERNATIVE 1 SERVE ALL TIER 2 CUSTOMERS ................................................ 265.3.2ALTERNATIVE 1A SERVE TIER 2 CUSTOMERS WEST OF THE NAPARIVER ............................................................................................................................ 275.3.3ALTERNATIVE 2 SERVE ALL TIER 2 CUSTOMERS AND IMPROVEDELIVERY RATE TO TIER 1 CUSTOMERS................................................................. 295.3.4ALTERNATIVE 2a SERVE TIER 2 CUSTOMERS WEST OF THE NAPARIVER AND IMPROVE DELIVERY RATE TO TIER 1 CUSTOMERS........................... 305.3.5ALTERNATIVE 3 MAXIMUM BUILDOUT OF RECYCLED WATER SYSTEMWITH LOOPED SYSTEM .............................................................................................. 325.3.6ALTERNATIVE 3a MAXIMUM BUILDOUT OF RECYCLED WATER SYSTEMWITHOUT LOOPED SYSTEM ...................................................................................... 335.3.7ALTERNATIVE 4 CONSTRUCT A MINIMUM REUSE PROJECT ............................. 345.3.8ALTERNATIVE 5 CONSTRUCT AN URBAN WATER REUSE SYSTEM .................. 355.3.9ALTERNATIVE 6 CONSTRUCT A LAND DISPOSAL PROJECT .............................. 36 5.4 SUMMARY AND INITIAL SCREENING ...........................................................................376.ECONOMIC ANALYSIS OF ALTERNATIVES ................................................. 39 6.1 ALTERNATIVES TO RECYCLED WATER ......................................................................396.1.1ADDITIONAL SWP SUPPLY ......................................................................................... 396.1.2TOLERATE THE ECONOMIC IMPACTS OF DROUGHT ............................................. 39 6.2 COMPARISION OF ALTERNATIVES ..............................................................................407.RECOMMENDED PROJECT .......................................................................... 42 7.1 PROJECT DESCRIPTION ...............................................................................................427.1.1BASIS FOR SELECTION .............................................................................................. 427.1.2SELECTED CUSTOMERS AND USERS ...................................................................... 43 7.2 PROPOSED FACILITIES .................................................................................................437.2.1FACILITIES DESCRIPTION .......................................................................................... 43 7.3 PROJECT IMPLEMENTATION ........................................................................................437.3.1FEASIBILITY REPORT AND ENVIRONMENTAL DOCUMENTATION......................... 447.3.2POLICY AND FUNDING ACTIVITIES ........................................................................... 457.3.3CUSTOMER ACTIVITIES .............................................................................................. 467.3.4PROJECT PERMITTING ACTIVITIES .......................................................................... 467.3.5PROJECT DESIGN ACTIVITIES ................................................................................... 47Town of YountvilleGHD 12027-11001-32204DRAFT Feasibility Study & Facilities Planning ReportiiJune 2012

5. Table Index Table 1-1: Revenue Requirements and Unit Costs of Recycled Water ............................... 2 Table 2-1: Document Outline Requirements and Location of Information ........................... 5 Table 3-1: Water Supply and Demand Balance in the Study Area .................................... 10 Table 4-1: Tier 1 Users and Area Irrigated ........................................................................ 12 Table 4-2: Table 4-2: Tier 2 Users and Area Irrigated ....................................................... 13 Table 4-3: Tier 3 Users and Area Irrigated ........................................................................ 13 Table 4-4: Urban Customers ............................................................................................. 14 Table 4-5: Recycled Water Supplied to Tier 1 Users ......................................................... 15 Table 4-6: Average Monthly Percentage of Tier 1 Recycled Water Demand ................... 16 Table 4-7: Tier 2 and Tier 3 Irrigation Area and Demand by User ..................................... 16 Table 4-8: Urban Customer Irrigation Demand by User .................................................... 17 Table 4-9: Market Assessment Summary .......................................................................... 18 Table 5-1: Average Monthly Recycled Water Production Rates (MGD) ............................ 20 Table 5-2: NOAA Rainfall Data Napa, California ............................................................ 21 Table 5-3: WRCC Evaporation Data Berryessa Station ................................................. 21 Table 5-4: Pond Volume and Working Storage by Tier ..................................................... 23 Table 5-5: Distribution System Design Criteria .................................................................. 24 Table 5-6: Costs Included within Major CSI Divisions ....................................................... 25 Table 5-7: Average Annual Recycled Water O&M Costs .................................................. 26 Table 5-8: Summary Construction Cost Estimate for Alternative 1 .................................... 27 Table 5-9: Summary Construction Cost Estimate for Alternative 1a .................................. 28 Table 5-10: Summary Construction Cost Estimate for Alternative 2 .................................. 30 Table 5-11: Summary Construction Cost Estimate for Alternative 2a ................................ 31 Table 5-12: Summary Construction Cost Estimate for Alternative 3 .................................. 33 Table 5-13: Summary Construction Cost Estimate for Alternative 3a ................................ 34 Table 5-14: Summary Construction Cost Estimate for Alternative 4 .................................. 35 Table 5-15: Summary Construction Cost Estimate for Alternative 5 .................................. 36 Table 5-16: Summary Construction Cost Estimate for Alternative 6 .................................. 37 Table 5-17: Initial Alternative Screening ............................................................................ 38 Table 6-1: Economic Consequences Drought ................................................................... 40 Table 6-2: Summary Economic Comparison .................................................................... 41Figure Index Figure 2-1: Study Area Figure 3-1: Study Area Figure 4-1 Recycled Water CustomersTown of YountvilleGHD 12027-11001-32204DRAFT Feasibility Study & Facilities Planning Reportiii June 2012

6. Figure 5-1: Alternative 1 Figure 5-1a: Alternative 1a Figure 5-2 Alternative 2 Figure 5-2a: Alternative 2a Figure 5-3: Alternative 3 Figure 5-3a: Alternative 3a Figure 5-4: Alternative 4 Figure 5-5: Alternative 5 Figure 5-6: Alternative 6Appendices A Water Balances B Cost Estimates C Environmental Document D Rate Study E Recycled Water Use Ordinance F Existing User AgreementsTown of YountvilleGHD 12027-11001-32204DRAFT Feasibility Study & Facilities Planning Report iv June 2012

7. 1. EXECUTIVE SUMMARYThe Town of Yountville has, with the assistance of a State Water Resources Control Board planning grantand a United States Bureau of Reclamation Feasibility and Environmental Studies cooperativeagreement, prepared a Feasibility Study and Facilities Planning Report (Report) for the Town of YountvilleRecycled Water Expansion Project (Project). The Project expands upon the existing recycled watersystem to include new users which will maximize the recycled water supply delivered to current/futurecustomers, minimize discharges to the Napa River and establish a flexible system for connecting newcustomers.The Report: presents background water and wastewater information relating to the Town provides detailed planning criteria for the required recycled water facilities provides a market assessment of potential users evaluates several alternatives for providing recycled water to customers develops and analyzes the construction and operating costs for the alternatives, and presents a financing and revenue plan and preliminary construction schedule for therecommended project.1.1 BENEFITS OF THE RECYCLED WATER PLANIf implemented, the Project will create multiple benefits including: reducing the water that would otherwise be withdrawn from the groundwater or Napa River forvineyard use by the proposed customers. providing an effective means of disposing of excess wastewater that is already treated to a highlevel. promoting the States policies of recycling water to supplement existing water supplies,maximizing reuse of wastewater for beneficial uses, and discontinuing the use of potable waterand well water for irrigations when recycled water is available.1.2 FACILITY PLANNING CONSIDERATIONSIn addition to the technical considerations of facility planning (ie flows, pressure, peaking factors),consideration must also be given to the costs of the recycled water system and the resulting rates for therecycled water users. Thus alternative systems with the ability to deliver different volumes of recycledwater for varying number of potential customers were considered and analyzed.Below summarizes the parameters for alternatives reviewed which were retained for this study. The Townhas selected Alternative 1a as the preferred alternative.Town of Yountville GHD 12027-11001-32204Feasibility Study & Facilities Planning Report1June 2012

8. Table 1-1: Revenue Requirements and Unit Costs of Recycled Water Alternative 1aAlternative 2aAlternative 3aCapital Costs ($1,000)$2,722 $4,318 $11,200Annual Operation and Maintenance $54,100$54,100 $54,100Water Delivered (AF)179 179 335Cost Per AF Delivered$15,210$23,480 $34,4301.3 RECOMMENDED PROJECTAlternative 1a, the recommended project, results in the lowest unit cost and it provides a benefit inreducing water withdrawal from groundwater, consistent with the State Water Resources Control Boardspolicies. This alternative provides for expansion of the recycled system and reduces discharges to theNapa River.Alternative 1a was selected as the recommended project for the following reasons: It achieves reduction in ground water and Napa River water use by the vineyards during theirrigation season It utilizes existing storage ponds on the future recycled water users property It results in compliance with the Joint Wastewater Treatment Plant discharge flow limitations It provides for an effective cost per acre foot of recycled water compared to other alternativesevaluated It provides a benefit to all water users It minimizes environmental impacts.Town of YountvilleGHD 12027-11001-32204Feasibility Study & Facilities Planning Report2 June 2012

9. 2. INTRODUCTIONThis report, prepared in coordination with the Bay Area Recycled Water Coalition, presents anengineering evaluation and an economic and financial analysis of a proposed expansion of the Town ofYountvilles (Towns) recycled water system.The report is intended to fulfill the requirements of the U. S. Department of the Interiors Bureau ofReclamation Public Law 102-575, Title XVI (the Reclamation Wastewater and Groundwater Study andFacilities Act of 1992, as amended) and the requirements of the State Water Resources Control BoardsPlanning Grant Program. Title XVI provides a mechanism for Federal participation and cost-sharing inapproved recycled water projects and provides general authority for appraisal and feasibility studies. TheState Water Boards planning grant program also funds feasibility level studies and assists applicants indeveloping the application materials necessary to qualify for other financial assistance programsadministered by the State Water Board.2.1BACKGROUND AND PROJECT PURPOSEThe Town currently delivers tertiary treated recycled water to a golf course and 770 acres of vineyards.The Town produces approximately 450 acre-feet (AF) of recycled water annually and deliversapproximately 275 AF to customers. In an effort to balance both demands on the local water supplies andto reduce seasonal discharges to the Napa River, the Town is developing a recycled water expansionproject that will reuse more of its high quality effluent.Funded by planning grants from the U. S. Bureau of Reclamation (Bureau) and the State WaterResources Control Board (State Board), the Towns work includes developing a range of projectalternatives which have the potential to contribute to the resolution of several regionally-based, watershedspecific management problems.The project area is tributary to the Napa River which supports a number of endangered species and is onthe State Boards list of impaired water bodies for sediment, pathogens and nutrients. Restoration of theNapa River is the subject of the award-winning Napa River Plan. Both wastewater discharges andagricultural diversions can negatively impact the habitat of the Napa River. Pumping irrigation water fromgroundwater aquifers also reduces the flow of water in the Napa River. An expanded recycled watersystem will reduce discharge and provide an alternative water supply. This is consistent with the NapaRiver Plan and the Regional Water Quality Control Boards Basin Plan.While the Town draws its primary water supply from local, state-operated Rector Reservoir, it cansupplement this supply with State Water Project (SWP) water. The operation of the SWP and its impacton the Sacramento-San Joaquin Delta is arguably the largest regional water management problem facingCalifornia today. An expanded recycled water project could lessen dependence on imported water.Finally, the groundwater in the Napa Valley is a very valuable and increasingly taxed resource. Some ofthe Towns recycled water customers do not have any irrigation water source besides the recycled water.The 2050 Napa Valley Water Resources Study (Napa 2050 Study) recognizes that expanded waterrecycling within the Napa Valley would provide an alternative water supply and reduce demands on thelocal groundwater basin. Recycled water is also a more sustainable and reliable source of water than thelocal surface water, which is affected by droughts.Town of Yountville GHD 12027-11001-32204Feasibility Study & Facilities Planning Report 3 June 2012

10. The Town operates a small utility system with a limited rate base of 800 customers and its efforts toresponsibly contribute to regionally-based watershed management problems must be developed in thecontext of being affordable and manageable in the rural context. Specifically the Town has analyzedalternatives for expanding the recycled water system in order to: Maximize the recycled water supply delivered to current/future customers Minimize discharges to the Napa River Establish a flexible system for connecting new customers.2.2 STUDY AREAThe project study area, illustrated in Figure 2-1, was developed to evaluate opportunities for expandingrecycled water use within the Town and portions of Napa County which adjoin the Town. The study areaincludes properties that are reasonably proximate to the Towns existing infrastructure and includes anumber of properties that have existing, onsite seasonal water storage ponds, which can be used tobalance recycled water supplies with potential demands.2.3 PLANNING PROCESS2.3.1 WORKSHOPS AND PUBLIC OUTREACHOn August 26, 2011 the Town conducted a workshop with existing and potential recycled water users. Atthe workshop, the Town provided an overview of: The recycled water program including drivers for the program and current customers Recycled water quality and allowable uses The proposed expansion project including the need for storage and benefits of offsettinggroundwater useCustomers expressed a general understanding of the benefits of an expanded program and requestedadditional information on costs.On March 23, 2012 the Town conducted a second workshop describing alternatives, financing methodsand potential costs shares. The Town provided and overview of: The history and purpose of the recycled water system The recommended project scope and benefits The existing rate structure The proposed future rate structureThe new customers mentioned they would only realize the benefit of a reliable water supply from theproject for water during the period from June 1 through October 31. Based on this feedback, the Townrecognizes the need to structure future recycled water contracts, for existing and new customers, toprovide the opportunity for all customers to receive some water during the summer months while stillmaximizing the use of existing seasonal storage ponds.The existing and potential customers seemed agreeable to the project.Town of Yountville GHD 12027-11001-32204Feasibility Study & Facilities Planning Report4June 2012

11. Path: J:12027 - The Town of Yountville12027-11-001 Recycled Water Expansion Project08-GISMapsFiguresMaster PlanFigure 2-1 Study Area.mxd - 3:33:24 PMLegendStudy AreaTown Limits Parcel Boundary Existing Customers Figure 2-1 Study Area Existing 6-inch PipelineJTPVintner G.C. YOUNTVILLE Veterans Memorial Park Hi gh way29Sile ravdo Tra il

12. 2.4DOCUMENT ORGANIZATIONThis document has been organized to facilitate review under both the Bureau and the State Boardsplanning grant programs. Table 2-1 outlines those requirements and illustrates where they can be foundin this document.Table 2-1: Document Outline Requirements and Location of InformationReports Table of ContentsFeasibility Report (Bureau) Facilities Plan/Project Report (State Board)1. Executive Summary Executive Summary2. IntroductionIntroduction3. Problem and Needs Problems and NeedsStudy Area Characteristics Research NeedsWater Supply Characteristics and Facilities Wastewater Characteristics and Facilities Treatment Requirements for Discharged and Reuse4. Water Reuse Opportunities Water Reuse Opportunities Recycled Water Market(Market Assessment)5. Project AlternativesDescription of Alternatives Project Alternative Analysis6. Economic Analysis Economic Analysis ofProject Alternative Analysis Alternatives7. Recommended Project Legal and Institutional Recommended Facilities Project RequirementsPlan Construction Financing Plan and Revenue ProgramAppendix A Water BalancesAppendix B Cost EstimatesAppendix C Environmental Environmental Analysis ofDocument AlternativesAppendix D Rate StudyFinancial Capability of the Rate Study Sponsor Construction Financing Plan and Revenue ProgramAppendix E Recycled WaterRecycled Water Use OrdinanceUse OrdinanceAppendix F Existing UserExisting User AgreementsAgreementsTown of YountvilleGHD 12027-11001-32204Feasibility Study & Facilities Planning Report 5June 2012

13. 3. PROBLEMS AND NEEDSThe Town has undertaken this study because it recognizes the need to optimize the use of its waterresources. The first part of this section provides a general overview of the study area including the localhydrologic characteristics and water quality and land use and population trends. The second part of thissection provides detail on water supplies and demands and future water supply projects that may benecessary to meet these demands. The third part provides a similar detail on the wastewater treatmentand disposal systems. An expanded recycled water system has the potential to meet water demands,resolve disposal challenges and support both the economy and the ecology of the study area.Like many agencies, the Town describes its water supply and water demands in terms of acre-feet (AF)and its wastewater flows and wastewater capacity in terms of million gallons (MG). There areapproximately 3 AF in 1 MG.3.1 STUDY AREA CHARACTERISTICSThe project study area, shown in Figure 3-1 is in the central part of the Napa Valley and includes theTowns incorporated area, the California Veterans Home, and unincorporated vineyards proximate to theTowns existing recycled water infrastructure. The study area is located in one of the most renownedvinticultural regions in the world and the study area includes significant agricultural land along with urbanuses that support a tourist industry.The study area is 8 miles north of the City of Napa, 9.5 miles south of the City of St. Helena and straddlesboth sides of the Napa River.3.1.1 HYDROLOGIC CHARACTERISTICS AND AMBIENT WATER QUALITYAs illustrated in Figure 3-1, the study area is located in the watershed of the Napa River, over the NapaValley groundwater basin and in the North Bay portion of the San Francisco Bay Hydrologic Region. Thestudy area is characterized by a Mediterranean climate with warm dry summers and wet cool winters.Rain generally occurs between October and May. January and February are usually the wettest months.The Towns primary water supply is drawn from Rector Reservoir on Rector Creek, a tributary to the NapaRiver. The Napa River is tributary to the San Pablo Bay estuary, whose remaining tidal wetlands serve ina vital ecological role as nurseries for fisheries and wintering areas for migratory waterbirds. The BasinPlan for the San Francisco Bay Region lists the beneficial uses of the Napa River as: Agricultural & municipal water supply Habitat for cold and warm water species Habitat for rare species Spawning habitat Wildlife use Recreation use Navigation useThe Napa River is listed on the State Water Boards 2006 303(d) impaired water bodies list as impairedfor nutrients, pathogens and sedimentation and siltation. The Napa County Flood Control and WaterTown of Yountville GHD 12027-11001-32204Feasibility Study & Facilities Planning Report6June 2012

14. CO O K RD D RR YEDW corpwkprojectssro12027 - The Town of Yountville12027-11-001 Recycled Water Expansion Project08-GISMapsFiguresMaster PlanFigure 3-1 Study Area.mxdYOUNTM ILLRD RD SS O R CLEIL N RD TVN U YO YO FI NNSODA CANELLTRD O ESAYNRWNA MON DELN ER JE PA LA STFN OORE FE KR R VIS FORDSO TANa p a RNSD HO R T YOLLY UN STST iv e rStagsTSR RY BET LCIRLeapMU KOA STN STIO SS AT MI DRWA EE LNHIN SVeteransGHGD HIN PAN WMemorialM LAAY GTARIDGEPark CHCT29 ONST DR I ARN Clos Du Val/FOA LI RegusciSCADA CUpgradesRWPSPRESIDENTS CIR RIDUpgrades GE CAJTPPDR PSUpgrades DRDRIE W DVAREY Chimney VINMondaviRock SISO LN LVLANE MARANO FFDOHO AV TRE LDRZ LN YGAT CRRAEEKRD Town LimitsTier 1 Service AreaExisting 6-inch Pipe0 900 1,800 ftFigure 3-1 www.ghd.com Study Area Parcel BoundaryTier 2 Service Area1 inch = 1,800 feet printed at 8.5x11Recycled Water PondsTier 3 Service AreaSources: ESRI Basemap: Aerial; NapaCounty GIS: Parcels, City Limits,ProjectCartographyDateProject #Roads; Winzler and Kelly GIS: Study Streams and Rivers Area, RW Pipes, Tiers.AF 5/31/20121202711001Town of Yountville

15. Conservation District has partnered with the Army Corps of Engineers on an ambitious multi-yearrestoration program that intended to enhance beneficial uses, improve water quality and reduce flooding.The Towns recycled water program generally supports beneficial uses of the river and restoration ofecological function through the reduction of discharges to the River.3.1.2 LAND USE TRENDS AND POPULATION PROJECTIONSAs illustrated in Figure 3-1 the study area includes significant agricultural development surrounding thecompact urban development within the Town and the Veterans Home. There is very little undevelopedproperty within the study area.Existing agricultural uses are protected as Agricultural Resource lands in the Napa County Land UsePlan. The Town, which was incorporated in 1965, is generally described as built out. The Town has apopulation of 2,900, of which 1,000 reside in the Veterans Home of California. Because of its reputationas a high quality visitors destination, the Town has experienced pressure for expansion but has adoptedpolicies to restrict development to modest expansion of local-serving businesses.3.2 WATER SUPPLYThe Town has defined a study area that includes its municipal boundaries, the California Department ofVeterans Affairs Yountville Veterans Home and approximately 4,000 acres of vineyards within a five mileradius of its existing recycled water pipelines. The study area has four principal sources of water, besidesrecycled water. These include: Rector Reservoir which provides primary water supply to the Town and the Veterans Home andwhich is owned and operated by the State of California Groundwater which provides backup municipal water supply, irrigation water supply and frostprotection of planted vines Napa River which provides irrigation water supply and frost protection of planted vines The North Bay Aqueduct, which is owned and operated by the California Department of WaterResources, and can deliver State Water Project (SWP) supplies through an agreement with NapaCounty Flood Control and Water Conservation District (District) to the Town under certain typesof emergency conditions3.2.1 RECTOR RESERVOIRThe Towns principal water supply is Rector Reservoir on Rector Creek, This facility, which is owned andoperated by the State of California, delivers local surface water to the California Veterans Home and theTown for municipal supply and to the Department of Fish & Game (DFG) for environmental uses and afish hatchery.There have been several studies of Rector Reservoirs capacity and safe yield. The most recent technicalstudy by the California Department of Water Resources (DWR) in 2000 calculated the reservoir capacityto be 4,535 acre-feet. The safe yield was estimated to be 1,670 acre feet annually (AFA) based on actualdeliveries during the 1992 drought including 1,190 AFA in flow releases needed to meet DFGs in-streamflow requirements. The Towns contractual capacity allowance in Rector Reservoir is 500 AF per year.Town of YountvilleGHD 12027-11001-32204Feasibility Study & Facilities Planning Report7 June 2012

16. Based on safe yield reliability analyses developed by the California Department of Water Resources(DWR), this supply is estimated to be reduced to 125 AF per year in dry years.3.2.2STATE WATER PROJECT WATER SUPPLYThe Napa County Flood Control and Water Conservations District (District) administers the SWP contractfor municipalities in Napa County. Surface water is delivered by the SWP through the North Bay Aqueduct(NBA), treated at the City of Napas Jameson Canyon water treatment plant and delivered to Yountvillethrough the Conn transmission main.The Town had historically held an entitlement for a total SWP contractual amount of 1,100 AF per year.Upon completion of its municipal well, the Town entered into an agreement with the District to sell thisentitlement but retain an emergency supply of 25 AF per year (intended to provide fire or short-termsupply) and the right to be included in the Districts dry-year water bank negotiations for an amount up to200 AF. The Town is not guaranteed that it will receive the 200 AF and is obligated to pay market price forthe water at the time it is secured.3.2.3GROUNDWATERThe Town overlies the Napa Valley groundwater subbasin, which provides municipal and agriculturalwater supply in the area. The groundwater level data illustrates generally stable long term trends in theSt. Helena, Yountville, and Napa areas. Groundwater quality is generally good, with some selected areasof elevated constituents, along the Napa valley floor of elevated nitrates. The Town has developed agroundwater supply system which is anticipated to yield 300 AF annually and which is generally used as abackup to the Rector Reservoir supply.In 2005 the District, as part of its water supply functions, developed the 2050 Napa Valley WaterResources Study (Napa 2050 Study) which reviewed the water supply and demand balances formunicipal and agricultural uses in Napa County. The Napa 2050 Study projected that the safe yield ofNapa Valley groundwater sub-basin is 28,000 AF. The Napa 2050 Study indicates that basin demandscould exceed supply during dry years by 6,000 AF in 2020 and 10,000 AF in 2050.For preliminary planning purposes, the Town estimated that the study area, which covers approximately10-percent of the groundwater basin area, could experience shortages of 600 to 1,000 AF (10-percent ofthe total basin shortages). Complicating this simple estimate of potential shortage is the fact that thegroundwater supply is subject to geographic variability. Generally, groundwater is available west of theNapa River but much scarcer east of the Napa River.Importantly for the Town and agricultural water users around the Town, the Napa 2050 Study highlightsthat the groundwater resource may be unable to meet the full range of demands placed upon it, duringdry periods in the relatively near future.3.2.3.1 Groundwater ManagementThere are three basic methods available for managing groundwater resources in California:management by local agencies under authority granted in the California Water Code or other applicable State statutes,local government groundwater ordinances or joint powers agreements, andcourt adjudications.Town of YountvilleGHD 12027-11001-32204Feasibility Study & Facilities Planning Report8 June 2012

2012 06-13 draft facilities planning report

Education

additional water

recycled water plan

water demand trends

ambient water quality

study area characteristics

mercury way

planning process

project purpose