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7C Page 49 B. CumuEative impacts on Sewaqe Treatment and Transrnission Caaacitv Potentia! lmpact '!4-2: The projec#woufd increase sewage generation in the project vicinity. The City already uses al! of its allocated capacity from the South Bayside System AutE�ority (SBSA)treatment p(ant, but possesses an option to purchase an additiona! 2.1 mifiion gallons per day {mgd) of dry weather treatment capacity. Because the SBSA treatmen# capacity allocation to the City is already being exceeded, and because the limited capaci#y of the sewage transmission system to the SBSA treatment plant wauld require mod�cations to the existing sewer system, the project-related and cumuiative impacts on sewage treatment and transmission capacity are considered a pofentially significanf projecf and curnulafive impact. Mitigation 10-2: Prior to City approval of any tentative map or devefopment agreerrient for the proposed project, the City shall purchase from the SBSA the dry weather treatment capacity necessary to accommodate the projected net increase in sewage generated by the proposed project. The project's ultimate treatment capacity requirement shall be calculated in the final permitting stage. The project applicant shall reimburse the City for all costs associated with the purchase of this freatment capacity (e.g., the capacity option itself, and associated administrative costs), the procedural details of which shall be included in a development agreement for the project. ln order to mitigate the limited transmission capacity from the project site to the SBSA treatment plant, the project applicant will be required to upgrade the influent lifting station (ILS) at the treatment plant and upgrade the treatment plant itself as necessary, as well as implement one of the following design sakufians, subject to approval by the City's Engineering and Construction Department: 1. Pump Directly fo fhe SBSA Treafinenf Plant: (a) install a new gravity sewer line from the project site to a new pump station at Bair Island Road, and (b) install new sewer lines from the new pump station to the SBSA treatment plant; or 2. Pump to fhe SBSA 4&lnch Sewer Sysfem Force Main (SSFM): (a) ins#all a new gravity sewer line from the project site to a new pump station at Bair Island Road, (b) instafl new sewer lines from the new pump station to the existing 48-inch SSFM, and (c) complete minor rnodificatians, if necessary, ta the existing SBSA pump station at Maple Street; or 3. Pump to fhe SBSA Pump Sfation at Maple Sfreef: (a) install a new gravity sewer fine from the project site to a new pump station at Bair Isiand Raad, {b) install new sewer lines from the new pump station ta the existing SBSA pump station a# Maple Stree#, and (c) upgrade the pump statian at Maple Street. 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's Corr�munity Development Services Department, City Hall, 1 Q17 Middlefield Road. Prior to the final design for construction documents, performance of flow monitoring will be required during AttylReso/Reso.1772 28 121307