Agmt01 County of San Mateo NPDES

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quality standard (objective) or are a significant contributor of pollutants. Section 402(p) provides that permits may be issued on a system -wide basis, shall include a requirement effectively prohibiting non -storm water discharges to storm sewers, and shall require controls to reduce the discharge of pollutants to the maximum extent practicable. The United States Environmental Protection Agency (hereinafter US EPA) promulgated regulations on November 16, 1990 on NPDES permit application requirements including the development of storm water management programs for municipal storm water discharges. The Dischargers' application and permit satisfy the intent of the Section 402(p) requirements. 5. Federal Code of Regulations, Title 40 — Protection of Environment, Chapter 1, Environmental Protection Agency, Subchapter D, Water Programs, Parts 122-125 (hereinafter referred to as 40 CFR specific Part number) contain promulgated regulation pertaining to the NPDES application permit conditions and program requirements. IV. Svecific Rationale Discharge Prohibition A.1 and A.2: These prohibitions reflect the CWA Section 402(p) requirement of effectively prohibiting non -storm water discharges to storm sewers. Effeciively prohibiting means that non -storm water discharges shall be specifically regulated by an NPDES permit or that the discharge is not considered waste or does not contain constituents of concern, in which case an NPDES permit would not be required. 2. Receiving Water Limitations B.1 and B.2: The receiving water limitations are the applicable water quality objectives and standards contained in the Basin Plan. Freshwater objectives apply to rivers, creeks, and other freshwater bodies within the basin. Marine water quality objectives apply to the Pacific Ocean, Lower and South San Francisco Bay, and the portions of the Bay's tributaries where the salinity of the water is suitable for marine aquatic life. Provision C.1: This provision states the essential theme of the permit that the Dischargers are expected to demonstrate compliance with Discharge Prohibition A.2 and Receiving Water Limitations B.1 and B.2 through the timely implementation of control measures, management practices, and other actions to reduce pollutants in discharges in accordance with their Plan. This standard of treatment is prescribed in 40 CFR 122.26(d)(2)(iv). If the Regional Board or Discharger(s) determine that the discharges are causing or contributing to an exceedence of an applicable water quality standard, the Discharger(s) need to submit a report describing what BMPs are currently being implemented and what additional BMPs will be implemented to reduce the pollutants that are causing or contributing to the exceedance of water quality standards. Preparation, implementation, and iterative improvement of an effective Plan are thus, the essential means of achieving and evaluating compliance.