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HomeMy WebLinkAbout12.c. Receive an overview of the Nutrient Management District Project 100078Page 1 of 10 Item 12.c. 110ENTRAL SAN December 19, 2024 FROM: NITIN GOEL, OPERATIONS OPTIMIZATION DIVISION MANAGER MELODY LABELLA, RESOURCE RECOVERY PROGRAM MANAGER REVIEWED BY: GREG NORBY, DEPUTY GM - ENGINEERING & OPERATIONS ROGER S. BAILEY, GENERAL MANAGER SUBJECT: RECEIVE AN OVERVIEW OF THE NUTRIENT MANAGEMENT DISTRICT PROJECT 100078 Staff will present an overview of the Nutrient Management District Project 100078. Strategic Plan Tie -In GOAL ONE: Customer and Community Strategy 2 - Promote initiatives to advance affordable and equitable access to services GOAL TWO: Environmental Stewardship Strategy 1 - Achieve compliance in all regulations GOAL SIX., Infrastructure Reliability Strategy 1 - Manage assets optimally GOAL SEVEN: Innovation and Agility Strategy 1 - Leverage data analytics to become a more efficient utility, Strategy 3 - Be adaptable, resilient, and responsive ATTACHMENTS: 1. Presentation December 19, 2024 Regular Board Meeting Agenda Packet - Page 69 of 97 Page 2 of 10 Overview 1. Background 2. Nutrient Management Project Overview a. Project Objectives b. Consider Recycled Water Opportunities c. Task List Questions and Discussion December 19, 2024 Regular Board Meeting Agenda Packet - Page 70 of 97 Page 3 of 10 Bay Area Nutrients Watershed Permit On July 10, 2024, the San Francisco Bay Regional Water Quality Control Board adopted an Order requiring all Bay Area wastewater agencies to reduce their discharge of total inorganic nitrogen (TIN) by 40 percent, relative to 2022, by October of 2034. Regional Water Board adopts permit requiring critical investments to protect San Francisco Bay Necessary sewage treatment upgrades over next decade will limit threat of 'red fides' that endanger water quality, aquatic species July 10, 2024 Contact: Blair Robertson—Information Officer OAKLAND—To help protect water quality and aquatic life in San Francisco Bay for generations to come, the San Francisco Bay Regional Water Quality Control Board adopted a permit today that will for the first time require nutrient reductions for all wastewater treatment plants discharging into the bay. The new permit, adopted under the Clean Water Act after years of monitoring and research, will go into effect Oct. 1. It requires that 40 sewage treatment plants must collectively reduce nitrogen discharges by 40% compared to 2022, when a "[ed tide" harmful algal bloom (HAD) triggered a massive fish kill in the San Francisco Bay. Nutrients are discharged into the bay from sewage treatment plants' wastewater. Excessive nutrients are a major contributor to HABs, which cause a dramatic depletion in dissolved oxygen levels, killing aquatic species. Toxins from HABs can cause illnesses through direct contact, inhalation, and fish and shellfish poisoning. HABs can be particularly devastating to indigenous communities and subsistence fishers. December 19, 2024 Regular Board Meeting Agenda Packet - Page 71 of 97 Media Release J Regional Water Board adopts permit requiring critical investments to protect San Francisco Bay Necessary sewage treatment upgrades over next decade will limit threat of 'red fides' that endanger water quality, aquatic species July 10, 2024 Contact: Blair Robertson—Information Officer OAKLAND—To help protect water quality and aquatic life in San Francisco Bay for generations to come, the San Francisco Bay Regional Water Quality Control Board adopted a permit today that will for the first time require nutrient reductions for all wastewater treatment plants discharging into the bay. The new permit, adopted under the Clean Water Act after years of monitoring and research, will go into effect Oct. 1. It requires that 40 sewage treatment plants must collectively reduce nitrogen discharges by 40% compared to 2022, when a "[ed tide" harmful algal bloom (HAD) triggered a massive fish kill in the San Francisco Bay. Nutrients are discharged into the bay from sewage treatment plants' wastewater. Excessive nutrients are a major contributor to HABs, which cause a dramatic depletion in dissolved oxygen levels, killing aquatic species. Toxins from HABs can cause illnesses through direct contact, inhalation, and fish and shellfish poisoning. HABs can be particularly devastating to indigenous communities and subsistence fishers. December 19, 2024 Regular Board Meeting Agenda Packet - Page 71 of 97 Page 4 of 10 TIN Removal in Central San's Treatment Plant Approximately 18-27 percent of Central San's influent TIN is removed through solids incineration (TIN in the solids is converted to nitrogen gas) and by Central San's Recycled Water Program, which facilitates beneficial reuse of nitrogen via landscape irrigation. Capital Improvement Projects are in progress to address aging infrastructure challenges and extend the remaining useful life of high-value assets with concrete repairs and seismic upgrades. The existing biological process cannot further remove TIN without expansion to accommodate high -mixed liquor concentrations or the addition of process intensification and densification with new technology. Current Secondary Process Wastewater °° ° ° ° o o ° o ° Ultraviolet from Collection ° o ° ° a o ° ° Disinfection System Primary Anaerobic Aeration Secondary Then Recycled Water Headworks Clarifiers Selector* Tanks or outfall to Suisun ( �4) Clarifiers Bay I4) ( Scrubbed Flue Gas to ` I Atmosphere Return Activated Sludge v�aste Activated Ash to Beneficial Reuse Dewatering Sludge Return Flows to Plant and Incineration *Anaerobic Selector is mixed but with no aeration or dissolved oxygen I December 19, 2024 Regular Board Meeting Agenda Packet - Page 72 of 97 Page 5 of 10 Comprehensive Wastewater Master Plan (CWMP) Placeholder for Nutrient Removal�� If nutrient removal were required fora recycled water project (i.e., Water Exchange or regulatory requirement, Modified Ludzac e, - , Ettinger (MLE)* is the placeholder process Benefits Established and proven treatment process \ Challenges \Q Significant construction effort for r contaminated soil relocation/removal and new secondary clarifiers and aeration All tanks Completing maintenance in dry weather season (May - October) would require adding new staff or seasonal contractors *MLE process increases the solids retention time to allow bacteria who use nitrogen as a food source to grow; this requires more aeration tank volume and clarifiers to treat the same flow Recent Secondary Process Projects December 19, 2024 Regular Board Meeting Agenda Packet - Page 73 of 97 D27 - 2028 Complete Aeration Complete project asin Diffuser Replacement and by spring 2034 Seismic Upgrades Planning Design Construction 2024 2025> 2026> 2027> 2028 2029> 2030> 2031 > 2032> 2033> 2034 2035 2026 -2027 4th Watershed Permit 2029 - 2034 Full-scale demonstration of Consider 4th Watershed Permit before starting construction MABR and validation of innovative technologies Smaller capital projects can be constructed (for example, inDENSE® *) earlier as needed; schedule will adjust as Compliance by © May -September 2035 project progresses • . .. Q CENTRAL $AN •'J'r +�.: y cua=u ca«.=.ws*. s.n+.nr ai�c -0, ITRAL SAN cdnva ca.rruws7.srxrwroma.-r R- Page 7 of 10 2a. Project Objectives Identify viable nutrient mitigation alternatives to assist ti Central San in selecting an optimal solution Consider various potential recycled water opportunities Maximize the value of existing assets Develop an optimal project phasing, schedule, and delivery plan that has the least impact on Central San's operations and ratepayers - Update the Board's Recycled Water Policy Develop a Predesign Report including site layouts of the t selected alternative 2b. Consider Recycled Water Opportunities The Nutrient Management Project will: Develop a roadmap that is flexible enough to incorporate potential large-scale recycled water opportunities, such as partnering with Contra Costa Water District to serve the Martinez refineries Evaluate all the potential ways Central San's Recycled Water Program can be expanded Irrigation of Central San's overflow basins and properties Economic incentives for increased use and new connections in Zone 1 Expanding the existing program into new areas December 19, 2024 Regular Board Meeting Agenda Packet - Page 75 of 97 Page 8 of 10 2c. Task List Develop population and TIN projections, review and summarize existing information, and develop planning basis Evaluate innovative nitrogen removal technologies Include site tours for full-scale MABR facilities in operation and any other promising innovative technologies Plan for piloting innovative technologies Existing facility evaluation Determine needed improvements to existing facilities to address deficiencies associated with operating at higher solids retention time (i.e., scum and foam trapping, dissolved air flotation thickening capacity/performance, etc.) Complete condition assessments and comprehensive asset evaluations as required 2c. Task List Continued Evaluate available treatment plant land use Consider areas of the treatment plant where new facilities could be constructed with and without disturbing the contaminated soil cap Coordinate with ongoing analyses by other consultants Evaluate expanded use of recycled water Consider ways to incentivize new recycled water connections and increase current customer usage in Zone 1 Consider expansion of the existing distribution system, including irrigation of Central San's wet weather basins and buffer properties 6. Evaluate potential synergies with Mt. View Sanitary District ri— v1i;__ 7. Alternatives analysis and business case evaluation Existing facility upgrades/retrofits New secondary process and ancillary facilities Recycled water and nature -based solutions December 19, 2024 Regular Board Meeting Agenda Packet - Page 76 of 97 is 2c. Task List Continued Project delivery method Evaluate and hold workshops on alternative project delivery methods Project schedule and phasing evaluation Develop robust project schedule for nutrient removal facilities to be fully operational by spring 2034 (1 year prior to required compliance) Develop an optimal project phasing schedule to have the least impact on Central San's operations and ratepayers 10. Nutrient management strategy and preliminary design report 11. Final design* 12. Bid services* 13. Engineering services during construction* *Consultants will not provide fees for these tasks Request for Proposal Schedule and Fee Estimate Request for Proposal issued: October 2024 Consultant Notice to Proceed: February 2025 Completion date of Tasks 1-10: February 2027 Estimated fees for Tasks 1-10: $3,500,000 Peer review team fees: $400,000 E a N December 19, 2024 Regular Board Meeting Agenda Packet - Page 77 of 97 Page 9 of 10 Page 10 of 10 December 19, 2024 Regular Board Meeting Agenda Packet - Page 78 of 97