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Section 4.0 – Environmental Setting and Discussion of Impacts <br /> <br /> <br />City of Redwood City 100 Initial Study/Mitigated Negative Declaration <br />Sandpiper Elementary School Facilities Expansion November 2016 <br />The State Water Resources Control Board (SWRCB) has issued statewide waste discharge <br />requirements for sanitary sewer systems that include requirements for development of an SSMP. The <br />SSMP is also required by the San Francisco Bay Regional Water Quality Control <br />Board (RWQCB). The City’s SSMP includes the elements required by both the SWRCB and <br />RWQCB and was last updated in December 2013. <br /> <br />4.17.1.2 Existing Conditions <br /> <br />Water Service and Supply <br /> <br />The project site is developed with the Sandpiper Community Center, Sandpiper Park, and Sandpiper <br />Elementary School. The water system serving the project site is owned and operated by the City of <br />Redwood City. A 10-inch water main located within the Egret Lane right-of-way serves the project <br />site. Existing water usage on the site is approximately 17,640 gallons per day (gpd). <br /> <br />Wastewater/Sanitary Sewer System <br /> <br />Sanitary sewer service is provided to the project site by the Redwood City sanitary sewer collection <br />system.37 Wastewater from the project area is treated at the Silicon Valley Clean Water wastewater <br />treatment plant located in Redwood Shores. Assuming 80 percent of water used by the school ends <br />up as wastewater, the existing school generates approximately 14,112 gpd of wastewater. A six-inch <br />sanitary sewer main located within the Redwood Shores Parkway right-of-way and an eight-inch <br />sewer main within Egret Lane right-of-way serves the project site. <br /> <br />Storm Drainage <br /> <br />The project site is developed and consists of both pervious and impervious surfaces. Runoff from the <br />project site currently flows into the City-maintained storm drainage system, which is comprised of a <br />network of inlets, manholes, pipes, outfall, channels, and pump stations. An existing 30-inch storm <br />drain main within the right-of-way of Egret Lane and Redwood Shores Parkway serves a portion of <br />the project site and a 24-inch main along the rear of the property serves the other portion. <br /> <br />Solid Waste <br /> <br />The most recent San Mateo County Integrated Waste Management Plan (IWMP) was approved by <br />CalRecycle in 2009. Each jurisdiction in the County has a landfill diversion requirement of 50 <br />percent per year. Ox Mountain Sanitary Landfill is the only landfill in operation in San Mateo <br />County. In 2008, the landfill had 3,598 tons per day of incoming solid waste and had a remaining <br />capacity to operate through 2029.38 <br /> <br />Solid waste disposal for the project site is provided by Recology of San Mateo County.39 <br /> <br />37 West Yost Associates. City of Redwood City Sewer Master Plan Update. January 2013. <br />38 San Mateo County. San Mateo County Integrated Waste Management Plan. December 2009. <br />39 City of Redwood City. “Public Works – Solid Waste.” Accessed June 22, 2016. Available at: <br />http://www.redwoodcity.org/departments/public-works/solid-waste. <br />7.A. - Page 131