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sources such as used motor oil, microbial pathogens of domestic sewage and from <br />illicit discharges, certain pesticides associated with the risk of acute aquatic toxicity, <br />excessive nutrient loads which cause or contribute to the depletion of dissolved <br />oxygen and/or toxic concentrations of dissolved ammonia, and other pollutants that <br />may cause aquatic toxicity in the receiving water. <br />3. The total population of San Mateo County is approximately 715,000 according to an <br />estimate prepared by the California Department of Finance. San Mateo County <br />encompasses approximately 445 square miles of land on a peninsula bordering San <br />Francisco Bay on the east and the Pacific Ocean on the west. Named east side <br />drainage basins include: Canada de Guadalupe, Colma Creek, San Bruno Creek, Mills <br />Creek, Sanchez Creek, San Mateo Creek, Pulgas Creek, Laurel Creek, Belmont <br />Creek, Cordilleras Creek, Redwood Creek, and San Francisquito Creeks. There are <br />also three lagoons on the east side of San Mateo County which receive stormwater <br />runoff: San Mateo, Foster City, and Redwood City. The major west side drainage <br />basins include San Pedro, Pilarcitos, Purisima, Tunitas, Pomponio, San Gregorio, and <br />Pescadero Creeks. <br />4. Section 402(p) of the federal Clean Water Act (CWA) requires NPDES permits for <br />stormwater discharges from separate municipal storm drain systems, stormwater <br />discharges associated with industrial activity (including construction activities), and <br />designated stormwater discharges that are considered significant contributors of <br />pollutants to waters of the United States. On November 16, 1990, the United States <br />Environmental Protection Agency (hereinafter US EPA) published regulations (40 <br />CFR Part 122) which prescribe permit application requirements for municipal <br />separate storm drain systems pursuant to Section 402(p) of the CWA. <br />5. The application requirements that the Regional Board has determined to be applicable <br />to the Dischargers include submittal of a proposed Stormwater Management Plan to <br />reduce the discharge of pollutants in stormwater to the maximum extent practicable <br />and to effectively prohibit non-stormwater discharges into municipal storm drain <br />systems and watercourses within the Dischargers' jurisdiction that they own and/or <br />operate. <br />6. The permit application submitted by the Dischargers includes STOPPP's Stormwater <br />Management Plan (hereinafter referred to as Plan), that describes a framework for <br />management of stormwater discharges during the term of this permit. The Title Page, <br />Table of Contents, Executive Summary, and Performance Standards of the Plan are <br />attached to this Order. The Plan describes STOPPP's goals and objectives, legal <br />authorities, management structure, and funding, the annual reporting and program <br />evaluations process, approach to watersheds and monitoring, and Performance <br />Standards. The chapters of the Plan include the following elements: a) Municipal <br />Government Maintenance Activities; b) Industrial and Illicit Discharge Controls; <br />c) Public Information and Participation; d) New Development and Construction <br />Controls; and e) Watershed and Monitoring. Appendices include: a) General Program <br />