Reso PC16-23 PC 0116 Reso CEQA - Sandpiper

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Section 4.0—Environmental Setling and Discussion of Impacts Program is admirtistered by RWQCB under the National Pollutant Discharge Elimination System (NPDES) General Permit for Construction Activities. Projects must comply with the requirements of the NPDES General Permit for Construction Activities if: • The project disturbs one acre or more of soil; or • The project disturbs less than one acre of soil but are part of a larger development project that, in total, disturbs one acre or more of soil. The NPDES General Permit for Construction Activities requires the developer to submit a Notice of Intent (NOI) to the RWQCB and to prepare and implement a Stormwater Pollution Prevention Plan (SWPPP) to control discharges associated with construction activities. The SWPPP must include site-specific best management practices (BMPs) to control erosion and sedimentation and maintain water quality during project construction, as well as BMPs to be implemented during project operation. The San Mateo Countywide Water Pollution Prevention Program (SMCWPPP) was established in 1990 to reduce the pollution carried by stormwater into local creeks, the San Francisco Bay, and the Pacific Ocean. The program is a partnership of the City/County Association of Governments (C/CAG), each incorporated city and town in the county, and the County of San Mateo, which share a common National Pollutant Discharge Elimination System (NPDES) permit. 22 Municipal Regional Stormwater NPDES Permit (MRP)/C.3 Requirements In an effort to standardize stormwater management requirements throughout the region, the RWQCB issued a Municipal Regional Stormwater NPDES Permit (MRP). The MRP replaces the formerly separate countywide municipal stormwater permits with a regional permit for 77 Bay Area municipalities, including the City of Redwood City. Under provisions of the MRP, redevelopment projects that add and/or replace more than 10,000 sf of impervious surface or 5,000 sf of uncovered parking area are required to design and construct stormwater treatment controls to treat post - construction stormwater runoff. Amendments to the MRP require all project -generated post - construction runoff to be treated using Low Impact Development (LID) treatment controls (e.g., biotreatment facilities), unless the project qualifies for a Special Project credit reduction. " 4.9.1.2 Water Quality The project site is located in an urban area. Approximately two-thirds of the project site is covered with impervious surfaces, including pavement, rooftops, and sidewalks. A portion of the stormwater runoff from the project site enters the Redwood Shores storm drain system by way of several catch basins located on the site. The other portion of stormwater runoff discharges into the lagoon from an outfall at the rear of the property. The Redwood Shores storm drain system that the project connects 2222 San Mateo Countywide Water Pollution Prevention Program. "About 5MCWPPP." Accessed December 15, 2015. Available at: http:Hwww.flowstobay.ore/about 23 Special Projects are smart growth projects (e.g., small urban infill, high density, or transit oriented development) that can receive LID treatment reduction credits and use specific types of non -LID treatment, but only after the use of on-site and offsite LID treatment is evaluated, City of Redwood City 56 Initial Study/Mitigated Negative Declaration Sandpiper Elementary School Facilities Expansion November 2016