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Legend: Applicant = project applicant, City = City of Redwood City Page 47 May 18, 2004 WP9.0l6451 MMCHT 645 Mu.41TORING VERIFitATION IDENTIFIED IMPACT RELATED MITIGATION MEASURE impl. Type of Impl. Monitoring and Timing Signature Date (CONDITION OF APPROVAL) Entity Action Verification Entity Requirements 95, the City has exceeded its allocated solutions, subject to approval by the City of capacity nine times during the winter. Redwood City Engineering and Construction Provision of sewer service to the project site Department: would require modifications to the existing sewer system from the project site to the (1) Pump Directly to the SBSA Treatment SBSA treatment plant in order to avoid any Plant: (a) install a new gravity sewer line further contribution to this existing condition. from the project site to a new pump station at Bair Island Road, and (b) install new As identified by the City of Redwood City sewer lines from the new pump station to Engineering and Construction Department, the SBSA treatment plant; `The main issue of concern is the limited delivering capacity of [the] regional or transmission system itself (i.e., pump stations and large force mains delivering member (2) Pump to the SBSA 48 -Inch Sewer agencies'sewer flows to the treatment System Force Main (SSFM): (a) install a plant) .... According to the SBSA, the City has new gravity sewer line from the project site reached its 25.9 mgd peak wet weather flow to a new pump station at Bair Island Road, (PWWF) capacity rights for the main area of (b) install new sewer lines from the new Redwood City. The problem is how to pump station to the existing 48 -inch SSFM, accommodate the additional PWWF from this and (c) complete minor modifications, if development, which is estimated as the necessary, to the existing SBSA pump project net peak off -hour (i. e., residential] flow station at Maple Street; of 1.7 mgd...." or Because the SBSA treatment capacity allocation to Redwood City is already being (3) Pump to the SBSA Pump Station at exceeded, and because the limited capacity of Maple Street: (a) install a new gravity sewer the sewage transmission system to the SBSA line from the project site to a new pump treatment plant would require modifications to station at Bair Island Road, (b) install new the existing sewer system, the project - related sewer lines from the new pump station to and cumulative impacts on sewage treatment the existing SBSA pump station at Maple and transmission capacity are considered a Street, and (c) upgrade the pump station at potentially significant project and Maple Street. cumulative impact. A detailed discussion of the design alternatives and potential design solutions is included in the Marina Shores Village Sewer Report, available for review at the City of Redwood City Community Development Services Department, City Hall, 1017 Middlefield Road. Prior to the final design for construction documents, performance of flow monitoring will be required during wet weather conditions and completion of Legend: Applicant = project applicant, City = City of Redwood City Page 47 May 18, 2004 WP9.0l6451 MMCHT 645