DRA                                         AFTFEAS   SIBILITY STUD & FA          Y    DY   ACILITIE PLA                  ...
DRAFTFEASIBILITY STUDY & FACILITIES PLANNING REPORTTOWN OF YOUNTVILLE RECYCLED WATER EXPANSION PROJECTYOUNTVILLE, CALIFORN...
Contents1.     EXECUTIVE SUMMARY ................................................................................... 1    ...
5.1.2       TREATMENT SYSTEM CAPACITY .............................................................................. 23   ...
Table Index       Table 1-1: Revenue Requirements and Unit Costs of Recycled Water ............................... 2      ...
Figure 5-1: Alternative 1       Figure 5-1a: Alternative 1a       Figure 5-2 Alternative 2       Figure 5-2a: Alternative ...
1. EXECUTIVE SUMMARYThe Town of Yountville has, with the assistance of a State Water Resources Control Board planning gran...
Table 1-1: Revenue Requirements and Unit Costs of Recycled Water                                                     Alter...
2. INTRODUCTIONThis report, prepared in coordination with the Bay Area Recycled Water Coalition, presents anengineering ev...
The Town operates a small utility system with a limited rate base of 800 customers and its efforts toresponsibly contribut...
Path: J:12027 - The Town of Yountville12027-11-001 Recycled Water Expansion Project08-GISMapsFiguresMaster PlanFigure 2-1 ...
2.4      DOCUMENT ORGANIZATIONThis document has been organized to facilitate review under both the Bureau and the State Bo...
3. PROBLEMS AND NEEDSThe Town has undertaken this study because it recognizes the need to optimize the use of its waterres...
CO                                                                                                                        ...
Conservation District has partnered with the Army Corps of Engineers on an ambitious multi-yearrestoration program that in...
Based on safe yield reliability analyses developed by the California Department of Water Resources(DWR), this supply is es...
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2012 06-13 draft facilities planning report

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2012 06-13 draft facilities planning report

  1. 1. DRA AFTFEAS SIBILITY STUD & FA Y DY ACILITIE PLA ES ANNING REPO G ORT TOW OF YOUNTVIL WN Y LLE RECY YCLED W WATER EX XPANSIO PROJE ON ECT YOUN NTVILLE, C CALIFOR RNIA June 2 2012 Prepared for: d Mr. Graham Wadsworth PE h, Tow of Youn wn ntville 6550 Yount S Street Yountv ville, CA 94 4599 Prepared by: d 223 Mercury Way, Suite 150 35 e Santa R Rosa, CA 95 5407 (707) 523-1010
  2. 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. 3. Contents1.  EXECUTIVE SUMMARY ................................................................................... 1  1.1  BENEFITS OF THE RECYCLED WATER PLAN...............................................................1  1.2  FACILITY PLANNING CONSIDERATIONS .......................................................................1  1.3  RECOMMENDED PROJECT .............................................................................................2 2.  INTRODUCTION ............................................................................................... 3  2.1  BACKGROUND AND PROJECT PURPOSE.....................................................................3  2.2  STUDY AREA .....................................................................................................................4  2.3  PLANNING PROCESS .......................................................................................................4  2.3.1  WORKSHOPS AND PUBLIC OUTREACH ..................................................................... 4  2.4  DOCUMENT ORGANIZATION ..........................................................................................5 3.  PROBLEMS AND NEEDS ................................................................................. 6  3.1  STUDY AREA CHARACTERISTICS .................................................................................6  3.1.1  HYDROLOGIC CHARACTERISTICS AND AMBIENT WATER QUALITY ...................... 6  3.1.2  LAND USE TRENDS AND POPULATION PROJECTIONS ............................................ 7  3.2  WATER SUPPLY ...............................................................................................................7  3.2.1  RECTOR RESERVOIR ................................................................................................... 7  3.2.2  STATE WATER PROJECT WATER SUPPLY................................................................. 8  3.2.3  GROUNDWATER ............................................................................................................ 8  3.2.4  RECYCLED WATER ....................................................................................................... 9  3.2.5  WATER DEMAND TRENDS............................................................................................ 9  3.2.6  SOURCES FOR ADDITIONAL WATER AND PLANS FOR NEW FACILITIES ............... 9  3.2.7  WATER SUPPLY AND DEMAND BALANCE .................................................................. 9  3.3  WASTEWATER TREATMENT & DISPOSAL ..................................................................10  3.3.1  EXISTING WATER RECYCLING AND EFFLUENT RIGHTS ........................................ 11  3.4  ENVIRONMENTAL WATER.............................................................................................11 4.  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 ......................................................18 5.  PROJECT ALTERNATIVES ............................................................................ 19  5.1  ENGINEERING ANALYSIS FOR ALTERNATIVE COMPONENTS ................................19  5.1.1  RECYCLED WATER SUPPLY AND WATER BALANCE .............................................. 19 Town of Yountville GHD 12027-11001-32204DRAFT Feasibility Study & Facilities Planning Report i June 2012
  4. 4. 5.1.2  TREATMENT SYSTEM CAPACITY .............................................................................. 23  5.1.3  PUMPING AND DELIVERY RATE ................................................................................ 24  5.1.4  DISTRIBUTION SYSTEM CAPACITY ........................................................................... 24  5.2  COST ASSUMPTIONS ....................................................................................................25  5.3  ALTERNATIVE DESCRIPTIONS .....................................................................................26  5.3.1  ALTERNATIVE 1 – SERVE ALL TIER 2 CUSTOMERS ................................................ 26  5.3.2  ALTERNATIVE 1A – SERVE TIER 2 CUSTOMERS WEST OF THE NAPA RIVER ............................................................................................................................ 27  5.3.3  ALTERNATIVE 2 – SERVE ALL TIER 2 CUSTOMERS AND IMPROVE DELIVERY RATE TO TIER 1 CUSTOMERS................................................................. 29  5.3.4  ALTERNATIVE 2a – SERVE TIER 2 CUSTOMERS WEST OF THE NAPA RIVER AND IMPROVE DELIVERY RATE TO TIER 1 CUSTOMERS........................... 30  5.3.5  ALTERNATIVE 3 – MAXIMUM BUILDOUT OF RECYCLED WATER SYSTEM WITH LOOPED SYSTEM .............................................................................................. 32  5.3.6  ALTERNATIVE 3a – MAXIMUM BUILDOUT OF RECYCLED WATER SYSTEM WITHOUT LOOPED SYSTEM ...................................................................................... 33  5.3.7  ALTERNATIVE 4 – CONSTRUCT A MINIMUM REUSE PROJECT ............................. 34  5.3.8  ALTERNATIVE 5 – CONSTRUCT AN URBAN WATER REUSE SYSTEM .................. 35  5.3.9  ALTERNATIVE 6 – CONSTRUCT A LAND DISPOSAL PROJECT .............................. 36  5.4  SUMMARY AND INITIAL SCREENING ...........................................................................37 6.  ECONOMIC ANALYSIS OF ALTERNATIVES ................................................. 39  6.1  ALTERNATIVES TO RECYCLED WATER ......................................................................39  6.1.1  ADDITIONAL SWP SUPPLY ......................................................................................... 39  6.1.2  TOLERATE THE ECONOMIC IMPACTS OF DROUGHT ............................................. 39  6.2  COMPARISION OF ALTERNATIVES ..............................................................................40 7.  RECOMMENDED PROJECT .......................................................................... 42  7.1  PROJECT DESCRIPTION ...............................................................................................42  7.1.1  BASIS FOR SELECTION .............................................................................................. 42  7.1.2  SELECTED CUSTOMERS AND USERS ...................................................................... 43  7.2  PROPOSED FACILITIES .................................................................................................43  7.2.1  FACILITIES DESCRIPTION .......................................................................................... 43  7.3  PROJECT IMPLEMENTATION ........................................................................................43  7.3.1  FEASIBILITY REPORT AND ENVIRONMENTAL DOCUMENTATION......................... 44  7.3.2  POLICY AND FUNDING ACTIVITIES ........................................................................... 45  7.3.3  CUSTOMER ACTIVITIES .............................................................................................. 46  7.3.4  PROJECT PERMITTING ACTIVITIES .......................................................................... 46  7.3.5  PROJECT DESIGN ACTIVITIES ................................................................................... 47 Town of Yountville GHD 12027-11001-32204DRAFT Feasibility Study & Facilities Planning Report ii June 2012
  5. 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 .................................................................... 41 Figure Index Figure 2-1: Study Area Figure 3-1: Study Area Figure 4-1 Recycled Water CustomersTown of Yountville GHD 12027-11001-32204DRAFT Feasibility Study & Facilities Planning Report iii June 2012
  6. 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 Yountville GHD 12027-11001-32204DRAFT Feasibility Study & Facilities Planning Report iv June 2012
  7. 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 the recommended 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 for vineyard use by the proposed customers.  providing an effective means of disposing of excess wastewater that is already treated to a high level.  promoting the State’s policies of recycling water to supplement existing water supplies, maximizing reuse of wastewater for beneficial uses, and discontinuing the use of potable water and 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 Report 1 June 2012
  8. 8. Table 1-1: Revenue Requirements and Unit Costs of Recycled Water Alternative 1a Alternative 2a Alternative 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 Board’spolicies. 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 the irrigation 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 alternatives evaluated  It provides a benefit to all water users  It minimizes environmental impacts.Town of Yountville GHD 12027-11001-32204Feasibility Study & Facilities Planning Report 2 June 2012
  9. 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 ofYountville’s (Town’s) recycled water system.The report is intended to fulfill the requirements of the U. S. Department of the Interior’s 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 Board’sPlanning 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 Board’s 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.2.1 BACKGROUND 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 Town’s 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 Board’s 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 Board’s 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 Town’s 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. 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 Town’s 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 offsetting groundwater 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 Report 4 June 2012
  11. 11. Path: J:12027 - The Town of Yountville12027-11-001 Recycled Water Expansion Project08-GISMapsFiguresMaster PlanFigure 2-1 Study Area.mxd - 3:33:24 PM Legend Study Area Town Limits Parcel Boundary Existing Customers Figure 2-1 Study Area Existing 6-inch Pipeline JTP Vintner G.C. YOUNTVILLE Veterans Memorial Park Hi gh wa y2 9 Sil e ra v do Tra il
  12. 12. 2.4 DOCUMENT ORGANIZATIONThis document has been organized to facilitate review under both the Bureau and the State Board’splanning 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 Contents Feasibility Report (Bureau) Facilities Plan/Project Report (State Board)1. Executive Summary Executive Summary2. Introduction Introduction3. Problem and Needs Problems and Needs Study Area Characteristics Research Needs Water 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 Alternatives Description of Alternatives Project Alternative Analysis6. Economic Analysis Economic Analysis of Project Alternative Analysis Alternatives7. Recommended Project Legal and Institutional Recommended Facilities Project Requirements Plan Construction Financing Plan and Revenue ProgramAppendix A – Water BalancesAppendix B – Cost EstimatesAppendix C – Environmental Environmental Analysis ofDocument AlternativesAppendix D – Rate Study Financial Capability of the Rate Study Sponsor Construction Financing Plan and Revenue ProgramAppendix E – Recycled Water Recycled Water Use OrdinanceUse OrdinanceAppendix F –Existing User Existing User AgreementsAgreementsTown of Yountville GHD 12027-11001-32204Feasibility Study & Facilities Planning Report 5 June 2012
  13. 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 theTown’s incorporated area, the California Veterans Home, and unincorporated vineyards proximate to theTown’s 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 Town’s 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 Board’s 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 Report 6 June 2012
  14. 14. CO O K RD D R R YE DW corpwkprojectssro12027 - The Town of Yountville12027-11-001 Recycled Water Expansion Project08-GISMapsFiguresMaster PlanFigure 3-1 Study Area.mxd YO UN T M IL L RD RD SS O R C LE IL N RD TV N U YO YO FI NN SODA CAN EL L T RD O ES AY NR W NA MO N DE LN ER JE PA LA ST F N OO RE FE KR R VIS FO R D SO TA Na p a R NS D HO R T YO LL Y UN ST ST iv e r Stags TS R RY BE T L CI R Leap MU K OA ST N ST IO SS AT MI DR WA E E LN HI N S Veterans GH G D HIN PA N W Memorial M LA AY GT A RIDGE Park CH CT 29 ON ST DR I A RN Clos Du Val/ FO A LI Regusci SCADA C Upgrades RWPS PRESIDENTS CIR RI D Upgrades GE CA JTP P DR PS Upgrades DR DR IE W DV AR EY Chimney VIN Mondavi Rock SI SO LN LV LA N E MA RA NO FF DO HO AV TR E LDR Z LN Y GAT CR RA EE K RD Town Limits Tier 1 Service Area Existing 6-inch Pipe 0 900 1,800 ft Figure 3-1 www.ghd.com Study Area Parcel Boundary Tier 2 Service Area 1 inch = 1,800 feet printed at 8.5x11 Recycled Water Ponds Tier 3 Service Area Sources: ESRI Basemap: Aerial; Napa County GIS: Parcels, City Limits, Project Cartography Date Project # Roads; Winzler and Kelly GIS: Study Streams and Rivers Area, RW Pipes, Tiers. AF 5/31/2012 1202711001 Town of Yountville
  15. 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 Town’s 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 “undeveloped”property 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 visitor’s 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 Veteran’s 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 Veteran’s Home and which is owned and operated by the State of California  Groundwater which provides backup municipal water supply, irrigation water supply and frost protection 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 Water Resources, and can deliver State Water Project (SWP) supplies through an agreement with Napa County Flood Control and Water Conservation District (District) to the Town under certain types of emergency conditions3.2.1 RECTOR RESERVOIRThe Town’s 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 Veteran’s 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 Reservoir’s 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 DFG’s in-streamflow requirements. The Town’s contractual capacity allowance in Rector Reservoir is 500 AF per year.Town of Yountville GHD 12027-11001-32204Feasibility Study & Facilities Planning Report 7 June 2012
  16. 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.3.2.2 STATE 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 Napa’s 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 District’s 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.3.2.3 GROUNDWATERThe 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, and  court adjudications.Town of Yountville GHD 12027-11001-32204Feasibility Study & Facilities Planning Report 8 June 2012

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