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DSRSD: at Dublin Project Water Supply Assessment

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DSRSD: at Dublin Project Water Supply Assessment DSRSD: AT Dublin Project Water Supply Assessment Prepared for Dublin San Ramon Services District February 2018 406-12-17-60 (THIS PAGE LEFT BLANK INTENTIONALLY) FINAL | FEBRUARY 2018 DSRSD: AT Dublin Project Water Supply Assessment ———— Prepared for Dublin San Ramon Services District Project No. 406-12-17-60 02-06-18 Project Engineer: Kambria Tiano, PE Date 02-06-18 QA/QC Review: Elizabeth Drayer, PE Date W E S T Y O S T A S S O C I A T E S Carlsbad 2173 Salk Avenue, Suite 250 Carlsbad, CA 92008 (760) 795-0365 Davis 2020 Research Park Drive, Suite 100 Davis, CA 95618 (530) 756-5905 Eugene 1650 W 11th Ave. Suite 1-A Eugene, OR 97402 (541) 431-1280 Irvine 6 Venture, Suite 290 Irvine, CA 92618 (949) 517-9060 Pleasanton 6800 Koll Center Parkway, Suite 150 Pleasanton, CA 94566 (925) 426-2580 Portland 4949 Meadows Road, Suite 125 Lake Oswego, OR 97035 (503) 451-4500 Sacramento 2725 Riverside Boulevard, Suite 5 Sacramento, CA 95818 (916) 504-4915 Santa Rosa 2235 Mercury Way, Suite 105 Santa Rosa, CA 95407 (707) 543-8506 Sunnyvale 1250 Oakmead Parkway, Suite 210 Sunnyvale, CA 94085 (408) 451-8453 Walnut Creek 1777 Botelho Drive, Suite 240 Walnut Creek, CA 94596 (925) 949-5800 W E S T Y O S T A S S O C I A T E S Table of Contents Executive Summary ...................................................................................................................................... 1 Overview ................................................................................................................................................. 1 Potable and Recycled Water Demands ................................................................................................. 1 Potable Water Supply Availability and Reliability ................................................................................... 2 Recycled Water Supply Availability and Reliability ................................................................................. 2 Verification of Sufficient Water Supply ................................................................................................... 2 1.0 Introduction ............................................................................................................................................. 3 1.1 Legal Requirement for Water Supply Assessment ........................................................................... 3 1.2 Need For and Purpose of Water Supply Assessment ...................................................................... 3 1.3 Water Supply Assessment Preparation, Format and Organization .................................................. 4 1.4 Acronyms and Abbreviations ............................................................................................................ 5 2.0 Description of Proposed Project ............................................................................................................. 6 2.1 Proposed Project Location ............................................................................................................... 6 2.2 Proposed Project Land Uses ............................................................................................................ 6 2.3 Comparison with Previous Land Use Descriptions in Other Planning Documents .......................... 9 2.4 Projected Water Demand ................................................................................................................. 9 2.4.1 Overall Water Use Assumptions ............................................................................................. 9 2.4.2 Water Use Factors .................................................................................................................. 9 2.4.2.1 Potable Water Use Factors ......................................................................................... 11 2.4.2.2 Recycled Water Use Factors ....................................................................................... 11 2.4.3 Calculation of Potable and Recycled Water Demands ......................................................... 11 2.4.4 Comparison with Water Demand Calculations in Other Planning Documents ..................... 11 3.0 Required SB 610 Determinations ......................................................................................................... 15 3.1 Does SB 610 Apply to the Proposed Project? ................................................................................ 15 3.2 Does SB 221 Apply to the Proposed Project? ................................................................................ 15 3.3 Who is the Identified Public Water System? .................................................................................. 17 3.4 Does DSRSD have an adopted Urban Water Management Plan (UWMP) and does the UWMP Include the projected water demand for the Proposed Project? ........................ 17 4.0 DSRSD Water Demands....................................................................................................................... 21 4.1 Historical and Existing Water Demands ......................................................................................... 21 4.2 Future Water Demands .................................................................................................................. 22 4.3 Dry Year Water Demands .............................................................................................................. 22 5.0 DSRSD Water Supplies ........................................................................................................................ 24 5.1 Water Supply Overview .................................................................................................................. 25 5.2 DSRSD Potable Water Supplies from Zone 7 ................................................................................ 25 5.2.1 State Water Project (SWP) ................................................................................................... 26 5.2.1.1 Table A Allocation ........................................................................................................ 26 5.2.1.2 Article 21 Water (Interruptible or Surplus Water) ........................................................ 27 5.2.1.3 Article 56d Water (Turnback Pool Water) .................................................................... 27 5.2.1.4 Yuba Accord ................................................................................................................ 28 i Dublin San Ramon Services District February 2018 Water Supply Assessment o\c\406\12-17-60\wp\012518 AT WSA for AT Dublin Project Table of Contents 5.2.2 Byron Bethany Irrigation District ........................................................................................... 28 5.2.3 Local Surface Water Runoff .................................................................................................. 28 5.2.4 Local Storage ........................................................................................................................ 29 5.2.4.1 Lake Del Valle ............................................................................................................. 29 5.2.4.2 Livermore Valley Groundwater Basin .......................................................................... 29 5.2.4.3 Chain of Lakes – Lake I and Cope Lake ..................................................................... 29 5.2.5 Non-Local Storage ................................................................................................................ 30 5.2.5.1 Semitropic Water Storage District ............................................................................... 30 5.2.5.2 Cawelo Water District .................................................................................................. 30 5.3 DSRSD Groundwater Supply ......................................................................................................... 31 5.3.1 DSRSD Groundwater Pumping Quota ................................................................................. 31 5.3.2 Historical and Projected Future Pumpage ............................................................................ 32 5.3.3 Groundwater Basin Description ............................................................................................ 32 5.3.4 Groundwater Quantity ........................................................................................................... 32 5.3.4.1 Artificial Recharge ....................................................................................................... 32 5.3.4.2 Current Sustainable Yield and Groundwater Pumping Quotas ................................... 33 5.3.5 Groundwater Quality ............................................................................................................. 33 5.4 Recycled Water .............................................................................................................................. 34 5.5 Summary of Current and Projected Future Water Supplies ........................................................... 36 6.0 Water Supply Reliability ........................................................................................................................ 37 6.1 Potable Water Supply Reliability .................................................................................................... 37 6.1.1 Zone 7 Reliability Policy for Municipal & Industrial Water Supplies ...................................... 37 6.1.2
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