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Appendix 4.15-1 Water Supply Assessment

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Appendix 4.15-1 Water Supply Assessment Appendix 4.15-1 Water Supply Assessment /lfCWD HLHHEOHCOUAIFYWHFEHO/SFH/CF DIRECTORS 43885 SOUTH GRIMMER BOULEVARD • FREMONT, CALIFORNIA 94538 MANAGEMENT (510) 668-4200 • FAX (510) 770-1793 • www.acwd.org ROBERT AZIZ AKBARI SHAVER General Manager JAMES G. GUNTHER KURT ARENDS JUDY C. HUANG Operations and Maintenance PAULSETHY LAURA J. HIDAS JOHN H. WEED Water Resources ED STEVENSON June 24, 2020 Engineering and Technology Services JONATHAN WUNDERLICH Finance VIA ELECTRONIC MAIL Carmela Campbell ([email protected]) Economic and Community Development Director City of Union City 34009 Alvarado-Niles Road Union City, CA 94587 Dear Ms. Campbell: Subject: Water Supply Assessment for Station East Project As requested by the City of Union City, Alameda County Water District (ACWD) has prepared a water supply assessment for the Station East Project (enclosed). The water supply assessment was adopted by the ACWD Board of Directors on June 11, 2020 (resolution enclosed). The water supply assessment was prepared pursuant to California Water Code Section §10910 which requires that a water supply assessment be provided to cities or counties for a project that is subject to the California Environmental Quality Act (CEQA), and which surpasses a threshold for the number of housing units and/or square feet of commercial/industrial buildings. The water supply assessment documents sources of water supply, quantifies water demands, evaluates drought impacts, and provides a comparison of water supply and demand that is the basis for an assessment of water supply sufficiency. The water supply assessment also includes provisions for Water Conservation to be implemented by the Project applicant. As noted in the assessment, these provisions will be a condition of water service to the Project. Please contact Thomas Niesar, ACWD's Water Supply & Planning Manager, at (510) 668-6549 or e-mail [email protected], with any questions regarding this assessment. Sincerely, Robert Shaver General Manager db/cs Attachments By E-mail cc: Leslie Carmichael, City of Union City ([email protected]) Devon Becker, ACWD ([email protected]) Thomas Niesar, ACWD ([email protected]) Laura Hidas, ACWD ([email protected]) 0 RECYCLED PAPER RESOLUTION NO. 20-042 OF BOARD OF DIRECTORS OF ALAMEDA COUNTY WATER DISTRICT APPROVING THE JUNE 2020 WATER SUPPLY ASSESSMENT FOR THE STATION EAST PROJECT WHEREAS, California Water Code Section 10910 requires that a city or county that receives an application for a project that is subject to the California Environmental Quality Act (CEQA), and that exceeds a threshold for the number of housing units and/or square feet of commercial/industrial building area request the public water system that would supply water to the project to provide a water supply assessment; WHEREAS, the City of Union City (City) has submitted the Station East Project (Project) that will allow for the construction of up to 964 multifamily residential units, 31,020 square feet of commercial space, and approximately 376,358 square feet of landscaped areas, including public parks and paseos, semi-private and private open space areas, and other landscaped areas; WHEREAS, the Project exceeds the statutory thresholds; WHEREAS, on February 18, 2020, the Alameda County Water District (District) received a request from the City to prepare a water supply assessment for the Project; WHEREAS, on April 21, 2020, the District issued a request for extension from the City to extend the WSA completion period for an additional 30 days; WHEREAS, staff has prepared a water supply assessment for the Project which includes a water supply and demand comparison under a range of hydrologic conditions; WHEREAS, Water Code Section 10910 requires the District’s Board of Directors to approve the water supply assessment. 1 NOW, THEREFORE, BE IT RESOLVED by the Board of Directors of the Alameda County Water District that the June 2020 Station East Project Water Supply Assessment is hereby approved and the General Manager is authorized and directed to submit it to the City of Union City. PASSED AND ADOPTED this 11th day of June 2020, by the following vote: AYES: Directors Akbari, Gunther, Sethy, Weed, and Huang NOES: None ABSENT: None /s/ JUDY C. HUANG Judy C. Huang, President Board of Directors Alameda County Water District ATTEST: APPROVED AS TO FORM: /s/ ANDREW WARREN /s/ PATRICK T. MIYAKI Andrew Warren, Assistant District Secretary Patrick T. Miyaki, General Counsel Alameda County Water District Alameda County Water District (Seal) 2 CERTIFICATE I, the undersigned District Secretary of ALAMEDA COUNTY WATER DISTRICT, do hereby certify that the foregoing is a full, true and correct copy of a Resolution of the Board of Directors of ALAMEDA COUNTY WATER DISTRICT, a political subdivision, which said Resolution was duly adopted at a meeting of said Board regularly, held on June 11, 2020, that a copy of said Resolution was forthwith duly entered in the minutes of said meeting of said Board, and that the same is in full force and effect. Dated: June 24, 2020 Gina Markou, District Secretary Alameda County Water District WATER SUPPLY ASSESSMENT FOR THE STATION EAST PROJECT JUNE 2020 PREPARED FOR CITY OF UNION CITY, CALIFORNIA Prepared by: ALAMEDA COUNTY WATER DISTRICT 43885 S. Grimmer Blvd. Fremont, CA 94538 Table of Contents INTRODUCTION 4 BACKGROUND 4 PURPOSE 4 METHODOLOGY 5 WATER DEMAND 6 WATER USE CATEGORIES 6 HISTORICAL AND CURRENT WATER USE 6 WATER DEMANDS - ACWD SERVICE AREA 7 WATER DEMANDS – STATION EAST PROJECT 8 Estimation of Project Water Demands 8 Water Efficiency Measures to be Incorporated in the Project 9 IMPACTS OF DROUGHT ON DEMANDS 9 WATER SUPPLY 11 WHOLESALE WATER SUPPLIES 11 State Water Project 11 San Francisco’s Regional Water System 12 LOCAL SOURCES 13 Niles Cone Groundwater Basin 13 Brackish Groundwater Desalination 14 Del Valle Reservoir 14 Recycled Water 14 WATER SUPPLY UNCERTAINTIES 15 Climate Change 15 Bay Delta Water Quality Control Plan Update 18 Local Supplies 18 San Francisco Regional Supplies 19 State Water Project Supplies 19 Semitropic Banking Program 21 SB 7 – Water Conservation Requirements under the 2009 Comprehensive Water Package 21 AB 1668 and SB 606 – Making Water Conservation a California Way of Life 22 i WATER SUPPLY IN NORMAL AND DRY YEAR CONDITIONS 22 Water Supply under Normal Year Conditions 22 Water Supply under Critical Dry Year Conditions 23 WATER SUPPLY AND DEMAND ANALYSES 24 NORMAL YEAR WATER SUPPLY 24 SINGLE DRY YEAR WATER SUPPLY 24 MULTIPLE DRY YEAR WATER SUPPLY 24 SUMMARY AND CONCLUSIONS 25 Multi-Family Residential Units 31 SUPPLY COMPONENT 36 Imported Supplies 36 Total Imported Supplies 36 Local Supplies 36 Total Local Supplies 36 Banking/Transfers 36 SUPPLY COMPONENT 36 Imported Supplies 36 Total Imported Supplies 36 Local Supplies 36 Total Local Supplies 36 Banking/Transfers 36 SUPPLY COMPONENT 37 Imported Supplies 37 Total Imported Supplies 37 Local Supplies 37 Total Local Supplies 37 Banking/Transfers 37 ATTACHMENT A – LETTER OF REQUEST FROM CITY OF UNION CITY FOR WATER SUPPLY ASSESSMENT AND LETTER OF REQUEST FROM ACWD FOR 30-DAY EXTENSION TO COMPLETE WATER SUPPLY ASSESSMENT ii ATTACHMENT B – ACWD URBAN WATER MANAGEMENT PLAN 2015-2020 ATTACHMENT C – ACWD WATER SUPPLY CONTRACTS ATTACHMENT D – ACWD RECOMMENDED WATER EFFICIENCY MEASURES LIST OF TABLES Table 1 ACWD Past and Current Water Use (Acre-Feet) ................................................ 27 Table 2 Estimated Future Water Demands in the ACWD Service Area – Normal Year (AF/yr) .............................................................................................................................. 28 Table 3 Estimated Future Water Demands in the ACWD Service Area – Critical Dry Year (AF/yr)...................................................................................................................... 29 Table 4 Estimated Future Water Demands in the ACWD Service Area – Multiple Dry Years (AF/yr) .................................................................................................................... 30 Table 5 Water Demands for Station East Project ............................................................. 31 Table 6 Overview of Contracts and Permits for ACWD’s Existing Water Supplies ....... 32 Table 7 Historical Water Supply Utilization by ACWD (AF/yr) ..................................... 33 Table 8 Summary of Potential Future Factors that may Influence ACWD Water Supply Reliability .......................................................................................................................... 34 Table 9 State Water Project Delivery Reliability Reports (DRR) Statistics ..................... 35 Table 10 Projected Normal Year Supply .......................................................................... 36 Table 11 Projected Critical Year Supply .......................................................................... 36 Table 12 Projected Multiple Dry Year Supply ................................................................. 37 Table 13 Water Supply and Demand Comparison: Normal Year .................................... 38 Table 14 Water Supply and Demand Comparison: Critical Dry Year ............................. 38 Table 15 Water Supply and Demand Comparison: Multiple Dry Year ............................ 38 LIST OF FIGURES Figure 1 ACWD Service Area and Station East Project Location Map ........................... 39 iii SECTION 1 INTRODUCTION BACKGROUND The City of Union City (City) has requested a Water Supply Assessment
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