AgdaPkt 2020-11-09 Joint SA PFA - Laserfiche WebLink

Browse Search

6.B. - Page 25 of 39 !( � KennedyJenks Assumptions: Two conference calls will be conducted with SFPUC to focus on hydrologic year selection and scenario development and initial outcomes will be presented to the group as part of Webinar #1. Upon conclusion of Webinar #1 a decision point to decide what scenarios to move forward. Deliverable: Summary tables describing hydrologic year selection and project yield assumptions for scenarios that move forward, which will be incorporated into the Phase 3 Study in (Task 3). 1.3 Nutrient Management Building on the work in Phase 2, this task will revisit background CSR nutrient concentrations (looking at monthly data), anticipated purified water nutrient concentrations from the AWP and regulatory requirements (SF Bay Basin Plan) to confirm the preliminary Phase 1 findings that : 1) Total phosphorus loading from the AWPF would be below background conditions in CSR. 2) Ammonia levels in the purified discharge would be approximately one to two orders of magnitude higher than existing reservoir conditions. 3) Relevant quantitative limits for the SF Bay Basin Plan include limits on un -ionized ammonia and dissolved oxygen; with no quantitative limits for phosphorus. Given these findings, stripping for ammonia reduction may be an appropriate nutrient control strategy. Stripping requires chemical addition to reach a target pH, then uses a blower to reduce ammonia. This task will describe the treatment technology, operational assumptions and capital/O&M costs for permeate stripping to meet the SF Bay Basin Plan requirements and background CSR ammonia concentrations. A summary of anticipated purified water nutrient concentrations and loads will be provided alongside assumed ambient nutrient concentrations and loads in the reservoir (based on background water quality data and reservoir volume). Ambient temperature data will be compared with anticipated purified water temperature projections to provide an estimate of temperature increase, if any, due to the augmentation of CSR with purified water. Assumptions: CSR nutrient data provided by SFPUC in Phase 2 (incl. NO3, NH3, PO4 and TP) to be used with additional data requested, as needed. SVCW data provided in Phase 2 to be used and San Mateo to provide any updated nutrient concentration estimates, if available. This task will focus on ammonia reduction via air stripping, to be located at the AWTP site. Deliverable: Summary tables/graphs for nutrient concentrations/loads in CSR, SVCW and San Mateo effluent, AWTP purified water and CSR. Description of RO permeate stripping (nutrient removal, operations, capital and O&M costs). Outcomes and assumptions will be incorporated into the Phase 3 Study in (Task 3). 1.4 Pulgas Facilities Operational Considerations This task will address operational changes needed at SFPUC Pulgas Facilities to accept purified water, provide dechloramination and discharge into CSR. Seasonal operational considerations (summer vs winter) will be summarized based on input from SFPUC. The water quality of augmented water would Page 3 47 ATTY/AGR.2020.216/MOA- SVCW, SFPUC, BAWSCA, Cal -Water, City of San Mateo (Page 22 of 36)