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p MONITORING VERIFICATION IDEND IMPACT RELATED hiIITlGATION MEASURE Implementation Monitoring and ' Timing Signature Date Enti Verification Ent s Re uirements day, for abet increase over existing the proposed development. Each future conditiort`lyofspproximately 367,334 gpd. individual development's ultimate treatment Redwood~ity already uses all of its allocated capacity requirement shalt be calculated in m the SBSA treatment plant, but the final permitting stage. The project capaaty ~ possess an option to purchase an applicant shall reimburse the City for the additiondj.~.915 million gallons per day (mgd) costs associated with the individual of dry w6~'lher capacity. The project- development's fair share of the purchase of generatDDWF increment of 367,334 gpd this treatment capaaty {e.g., the capacity (0.367 mgd} is less than the City's purchase option itself, and associated administrative option of 1.915 mgd. costs} and implementation of one of the transmission capacity Improvement options In recent years, wastewater flow to the SBSA listed below, the procedural details of which collection system from Redwood City has shall be included in either a project occasionally exceeded the current peak wet memorandum or a development agreement weather flow capacity right (exGusive of for each project, at the discretion of the City Redwood Shores) of 25.9 mgd. Since 1994- Engineer. 95, the City has exceeded its allocated capacity nine times during the winter. Since In order to mitigate the limited transmission the SBSA treatment capacity allocation to capacity during wet weather from the Redwood City is already being exceeded Precise Plan area to the SBSA treatment during wet weather, the current allocation plant, implementation of one of the from the SBSA is inadequate to serve the following options would be necessary: project's projected Moderate [ntensity alternative ADDWF increment in addition to {1) Upgrade the influent lifting station at the existing SBSA commitments. Because the treatment plant, upgrade the treatment SBSA wet weather Vestment capaaty plant itself as necessary, install a rn~w allocation to Redwood City is already being gravity sewer line from the SBSA pump exceeded, the Precise Plan Moderate station at Maple Street, and upgrade the Intensity alternative-related and cumulative pump station at Maple Street; or impacts on wet weather flow treatment capaaty are considered to represent a (2) Replace 21,000 feet of 6-inch, :3,600 potentially significant project and feet of 8-inch, and 2,000 feet of 10-inch cumufative impact. pipes within the Precise Plan area, and 6,200 feet of 6-inch pipes outside the Plan area, to reduce the wet weather flaws. By replacing existing wastewater collection pipes, and thus reducing infiltration and inflow, the increase in ADDW F from Precise Plan-related growth would be mitigated, and the wet weather flow would not'sncrease from Plan-facilitated ~ development. An additional benefit would = be the replacement of all substandard 6- ~ ~ inch pipes with City standard 8-inch pipes. ~~ ~ ~ Implementation of this measure would ~,,~ p reduce the Precise Plan Moderate Intensity alternative and cumulative impacts on Page zi U:IMy Documenfst0oxmfown Precise Pian1CC staff reporfslCC 3. f 2.doci3. f 2.07 Exhibits~Atfachment A mit.mertitoring checklist 655.dac