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HomeMy WebLinkAbout12.a. Update on the Feasibility Evaluation of Recycled Water Project Concepts set forth in the Memorandum of Understanding between Central San and East Bay Municipal Utility DistrictItem 12.a. March 21, 2024 T O: HO NO R A B L E B O A R D O F D I R E C TO R S F RO M :ME L O D Y L A B E L L A , R E S O UR C E R E C O V E RY P R O G R A M MA NA G E R RE V IE WE D B Y:G R E G J . NO R B Y, D E P UT Y G E NE R A L MA NA G E R - E NG I NE E R I NG A ND O P E R AT I O NS R O G E R S. B A I L E Y, G E NE R A L MA NA G E R S UB J E C T: UP D AT E O N T HE F E A S I B I L I T Y E VA L UAT I O N O F R E C YC L E D W AT E R P R O J E C T C O NC E P T S S E T F O RT H I N T HE ME MO R A ND UM O F UND E R S TA ND I NG B E T W E E N C E NT R A L S A N A ND E A S T B AY MUNI C I PA L UT I L I T Y D I S T R I C T I n October 2022, Central S an and East Bay Municipal Utility D istrict (E B MUD ) executed a Memorandum of Understanding (MO U) f or a feasibility evaluation of an array of potential recycled water project concepts between the two agencies - f rom landscape irrigation to potable reuse. After completing a competitive procurement process, E B MUD hired a consulting team to complete the evaluation. E B MUD Associate Engineer, Sarah Reynolds, will review the attached presentation with the Board, which summarizes the results and next steps. Strategic Plan Tie-I n G O A L TW O: Environmental Stewardship Strategy 3 - Be a partner in regional development of local water supply AT TAC HM E NT S : D escription 1. P resentation March 21, 2024 Regular Board Meeting Agenda Packet - Page 97 of 195 Page 1 of 9 1 ` Photo caption example (Arial 18 pt. italic) EBMUD-Central San Recycled Water Feasibility Evaluation Update Central San Board Meeting March 21, 2024 © 2024 EAST BAY MUNICIPAL UTILITY DISTRICT Agenda • Background • Summary of Project Concept Evaluation • DERWA-Central San Diversion Project Status • Next Steps 2 1 2 March 21, 2024 Regular Board Meeting Agenda Packet - Page 98 of 195 Page 2 of 9 2 © 2024 EAST BAY MUNICIPAL UTILITY DISTRICT • Existing recycled water projects serve irrigation and industrial customers in EBMUD’s water service area • Current capacity: 9 million gallons per day (MGD) • Goal: 20 MGD by 2040 EBMUD’s Recycled Water Program 3 DERWA / San Ramon Valley Phase 1 & 2 Richmond Advanced Recycled Expansion (RARE) East Bayshore Phase 1A North Richmond WRP San Leandro WRP WRP = water recycling plant DERWA = Dublin San Ramon Services District – EBMUD Recycled Water Authority © 2024 EAST BAY MUNICIPAL UTILITY DISTRICT Feasibility Evaluation Background 4 • Central San identified as potential partner for regional recycled water opportunities in EBMUD’s 2019 Recycled Water Master Plan Update • Memorandum of Understanding between EBMUD and Central San executed in October 2022 to further explore recycled water partnership opportunities • Evaluate non-potable and potable reuse project concepts • EBMUD to lead development of the feasibility study 3 4 March 21, 2024 Regular Board Meeting Agenda Packet - Page 99 of 195 Page 3 of 9 3 Summary of Project Concept Evaluation © 2024 EAST BAY MUNICIPAL UTILITY DISTRICT Recommended for Consideration of Near-Term Implementation? Estimated Every Year Unit Cost ($/AF)Average Capacity/YieldProject Concept No – significant cost, low amount of potable water savings$18,500<1 MGD/1,000 AFYLamorinda Project Continue to support customers considering self-funding satellite projects$9,500<0.5 MGD/250 AFY per customerSatellite Water Recycling Facilities Yes – lower cost project, proof of concept through temporary diversions$1,350Up to 3 MGD/2,200 AFYDERWA Expansion No – water supply benefit to EBMUD is limited, uncertainty associated with future refinery demands/operations $5,600* Up to 13 MGD to refineries Yield to EBMUD through exchange: Up to 6.5 MGD/ 7,300 AFY Refinery Recycled Water Exchange Non-Potable Reuse Project Summary *Cost of Central San’s upgrades for nutrient removal not included MGD = million gallons per day AF = acre-feet AFY = acre-feet per year DERWA = Dublin San Ramon Services District – EBMUD Recycled Water Authority 6 5 6 March 21, 2024 Regular Board Meeting Agenda Packet - Page 100 of 195 Page 4 of 9 4 © 2024 EAST BAY MUNICIPAL UTILITY DISTRICT DERWA-Central San Diversion Project 7 • Benefits: utilizes existing facilities, provides up to 3 MGD in supplemental supply to DERWA to serve EBMUD/Central San customers, potential to provide nutrient discharge reduction benefits to Central San • Challenge: potential institutional and technical issues © 2024 EAST BAY MUNICIPAL UTILITY DISTRICT Potable Reuse Project Summary Recommended for Further Evaluation?Estimated Every Year Unit Cost ($/AF)Average Capacity/YieldProject Concept No – significant institutional and permitting challenges$4,700*Up to 17.9 MGD/20,000 AFY in supply to Los Vaqueros Indirect Potable Reuse – Los Vaqueros Reservoir Yes – compare against other IPR alternatives$3,700*17.9 MGD/20,000 AFYIndirect Potable Reuse – Briones Reservoir Yes – compare against other DPR alternatives$3,600*17.9 MGD/20,000 AFYDirect Potable Reuse – Mokelumne Aqueducts Yes – compare against other DPR alternatives$3,900*17.9 MGD/20,000 AFYDirect Potable Reuse – Walnut Creek WTP *Cost of Central San’s upgrades for nutrient removal not included 8 MGD = million gallons per day AF = acre-feet AFY = acre-feet per year WTP = water treatment plant 7 8 March 21, 2024 Regular Board Meeting Agenda Packet - Page 101 of 195 Page 5 of 9 5 © 2024 EAST BAY MUNICIPAL UTILITY DISTRICT Evaluation Criteria 9 AssessmentCriteria Challenges, requirements, and time to implement the project from a planning and permitting perspective.Regulatory requirements Additional treatment needs for beneficial use.Treatment requirements Impact on EBMUD operations, complexity of the alternative, and how challenging it will be to implement.Implementation challenges Customer base impacted by new supply and percentage of EBMUD’s service area served with new supply.Environmental justice/equity Level of outreach needed for public acceptance. Public outreach needs Number of institutional partners needed (additional agencies involved).Institutional complexities Project resiliency to climate change.Climate change resiliency © 2024 EAST BAY MUNICIPAL UTILITY DISTRICT 10 Projects for Further Consideration Highest scoring, lowest cost Note: Lamorinda Project and Satellite Projects estimated at ~2x the unit cost of other projects and are not shown. 9 10 March 21, 2024 Regular Board Meeting Agenda Packet - Page 102 of 195 Page 6 of 9 6 © 2024 EAST BAY MUNICIPAL UTILITY DISTRICT While potable reuse presents opportunities, there are significant challenges to address, including: • Potable reuse treatment and operational requirements not conducive to seasonal or dry year operations • Potential need for potable reuse supply is intermittent and primarily during droughts • High project cost compared to other water supply/management options • Strict regulations and complex permitting for DPR and IPR • Lack of precedent for DPR projects – regulations approved in December 2023, but no approved projects • Operator certification challenge for advanced water treatment train and water treatment plants, complex operations requirements for DPR and IPR (reservoir augmentation) • Significant lead time and costs for public outreach and additional technical studies Potable Reuse Challenges 11 DERWA-Central San Diversion Project Status 11 12 March 21, 2024 Regular Board Meeting Agenda Packet - Page 103 of 195 Page 7 of 9 7 © 2024 EAST BAY MUNICIPAL UTILITY DISTRICT 13 EBMUD is interested in further evaluating a permanent DERWA diversion: • Need to resolve institutional concerns relating to Proposition 218 and service area, and evaluate including Central San as a partner in DERWA • Need to conduct technical study on the wastewater flow diversion, including total inorganic nitrogen (TIN) load diverted and adapting the diversion volume to the demand • If institutional and technical issues can be resolved, develop a long-term agreement • Target completion by end of calendar year 2024 DERWA-Central San Diversion Project © 2024 EAST BAY MUNICIPAL UTILITY DISTRICT Next Steps 14 • Evaluate the DERWA-Central San diversion project, address issues identified and develop long-term agreement • Recommended long-term projects to be further evaluated in EBMUD’s Recycled Water Strategic Plan (RWSP) Update • EBMUD Board workshop – preliminary update on March 26, 2024 • EBMUD Board workshop – recommend RWSP Update in September 2024 • EBMUD to conduct additional analysis on need for water, demands update, and comparison of supplemental water supplies (including recycled water) for update of Urban Water Management Plan with water supply portfolio recommendation by 2026 13 14 March 21, 2024 Regular Board Meeting Agenda Packet - Page 104 of 195 Page 8 of 9 8 © 2022 EAST BAY MUD MUNICIPAL UTILITY DISTRICT. CONFIDENTIAL. DO NOT DISTRIBUTE. Questions? 15 March 21, 2024 Regular Board Meeting Agenda Packet - Page 105 of 195 Page 9 of 9