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

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6.B. - Page 28 of 39 !( � KennedyJenks (3) TWA at 1 location near SVCW (6 mgd) to deliver purified water to a local point of connection to the drinking water distribution system. (4) TWA at 1 location near San Carlos Airport (12 mgd) or a location further south (TBD), to deliver purified water to a point of connection to the drinking water distribution system in the South Bay. Facility requirements for conveyance and treatment will build on Phase 2 alternatives to the greatest extent possible. Assumptions: • The AWP locations identified for Phase 2 will be assumed for this task, with the exception of identifying 1 potential site in San Mateo for a TWA alternative near the San Mateo WWTP (to be identified based on discussions with the Parties of known open space areas). A siting analysis and facility layouts will not be performed as part of this work as long as there is sufficient facility siting and layout information, and comparable cost information. • Only 1 conveyance alternative will be identified to and from the AWP for each alternative, following major roads or ROWs if known. Phase 2 alignments and conveyance assumptions will be used as -appropriate. • The point of connection to the distribution system for each alternative will be (1) an identified existing drinking water storage tank, (2) a new proposed storage tank or (3) an existing drinking water distribution pipeline suitably sized to accept the purified water flow rate. Existing facility sizes and locations to be provided by the Parties. If an exact location is not able to be determined, an estimate of necessary conveyance and storage requirements will be made for comparison purposes. • Drinking water system facility (pipeline or storage) locations and capacities to be provided by the PREP Parties. • The ability of the drinking water system to accept purified water will be based on typical hydraulic calculations (e.g. Hazen Williams formula) based on pipeline diameter and purified water flow. Hydraulic modeling of the drinking water system is not included in this task. • The DPR train for RaWA/TWA will be the same, and will assume full advanced treatment (RO with AOP) with the addition of Ozone/BAC and free chlorine to provide additional barriers and log removal credits. AWP layouts will not be developed as part of this task. • Brine from the AWP will be disposed of through the existing SVCW outfall. The analysis of brine discharge considerations from Phase 2 would apply. • The DPR analysis will assume that there is sufficient demand for the purified water, which would offset local demands on the RWS. • For Bear Gulch Reservoir, information regarding increases of water levels within Bear Gulch Reservoir to accommodate the RaWA concept will assist CalWater's determination of size of reservoir and increases in dam height. Page 6 50 ATTY/AGR.2020.216/MOA- SVCW, SFPUC, BAWSCA, Cal -Water, City of San Mateo (Page 25 of 36)