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1�s ._.rtiai Study–LID Annexation The National Pollutant Discharge Elimination System(NPDES)permit program was established in the CWA of 1972 to regulate municipal and industrial discharges to surface waters of the United States. The discharge of wastewater to surface waters is prohibited unless an NPDES permit issued by the applicable RWQCB allows that discharge. Each NPDES permit identifies effluent and receiving water limits on allowable concentrations and/or mass emissions of pollutants contained in the discharge; prohibitions on discharges not specifically allowed under the permit; and provisions that describe required actions by the discharger, including industrial pretreatment, pollution prevention, self-monitoring,and other activities. More specifically,the discharge prohibitions and limitations in an NPDES permit would be designed to ensure the maintenance of public health and safety,protection of receiving water resources,and safeguarding of the designated beneficial uses. Discharge limitations typically define allowable effluent quantities for flow,biochemical oxygen demand(BOD),total suspended matter,residual chlorine, settleable matter,total coliform, oil and grease,pH,and toxic pollutants. Limitations also typically encompass narrative requirements regarding mineralization and toxicity to aquatic life. The provisions provide stipulations for the disposal of solid materials, limitations on effects caused to receiving waters, and other general requirements. The Regional Water Quality Control Board also uses the NPDES program to regulate stormwater runoff. The system is implemented through the issuance of permits for certain construction and operational activities that could result in the generation of contaminants in stormwater runoff.NPDES permits require the implementation of design and operational best management practices(BMPs)to reduce the level of contaminant runoff.Types of BMPs include source controls,treatment controls,and site planning measures. Section 401 Water Quality Certification Waiver Under Section 401 of the CWA,an applicant for a Section 404 permit(to discharge dredged or fill material into waters of the United States)must first obtain a certificate from the appropriate state agency stating that the fill is consistent with the state's water quality standards and criteria. In California,the authority to either grant water quality certification or waive the requirements is delegated by the SWRCB to the nine regional boards; in San Joaquin County this is the Central Valley Regional Water Quality Control Board(Region 5). 2.8.2 Hydrology and Water Quality-Impacts Potentially Less Than Less Than No Impact Significant Significamwith Significant Inpact Mitigation Impact Incorporation VIII. HYDROLOGY AND WATER QUALITY— Would the project: a) Violate any water quality standards or waste discharge ❑ ❑ ❑ 0 requirements? b) Substantially deplete groundwater supplies or interfere ❑ ❑ ❑ substantially with groundwater recharge such that there would be a net deficit in aquifer volume or a lowering of the local groundwater table level (e.g., the production rate of pre-existing nearby wells would drop to a level which would not support existing land uses or planned uses for which permits have been granted)? 43