Res07 14829 - Laserfiche WebLink

Browse Search

12/1712007 B. Cumulative Impacts on Sewaae Treatment and Transmission Capacity Potential Impact 10-2: The project would increase sewage generation in the project vicinity. The City already uses all of its allocated capacity from the South Bayside System Authority (SBSA) treatment plant, but possesses an option to purchase an additional 2.1 million gallons per day (mgd) of dry weather treatment capacity. Because the SBSA treatment capacity allocation to the City is already being exceeded, and because the limited capacity of the sewage transmission system to the SBSA treatment plant would require modifications to the existing sewer system, the project-related and cumulative impacts on sewage treatment and transmission capacity are considered a potentially significant project and cumulative impact. Mitigation 10-2: Prior to City approval of any tentative map or development agreement 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 treatment 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. In 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 solutions, subject to approval by the City's Engineering and Construction Department: 1. Pump Directly to the SBSA Treatment 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 the SBSA 48-lnch Sewer System Force Main (SSFM): (a) install a new gravity sewer line from the project site to a new pump station at Bair Island Road, (b) install new sewer lines from the new pump station to the existing 48-inch SSFM, and (c) complete minor modifications, if necessary, to the existing SBSA pump station at Maple Street; or 3. Pump to the SBSA Pump Station at Maple Street: (a) install a new gravity sewer line from the project site to a new pump station at Bair Island Road, (b) install new sewer lines from the new pump station to the existing SBSA pump station at Maple Street, and (c) upgrade the pump station 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 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 Atty/Reso/Reso.1772 121707 28 14829 Muff# 613