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San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures Development Department Surface Hydrology,Stormwater,and Water Quality -- Central Valley Regional Water Quality Control Board The State Water Board administers water rights,water pollution control,and water quality functions throughout the state,whereas the RWQCBs conduct _ planning,permitting,and enforcement activities. The project area is in the jurisdiction of the Central Valley RWQCB. Each RWQCB has adopted its own Water Quality Control Plan (Basin Plan)to implement plans,policies, and provisions for water quality management in its region. The CVRWQCB is responsible for such a large region that it has developed two basin plans: the"Water Quality Control Plan for the Sacramento — River Basin and the San Joaquin River Basin Fourth Edition"(Revised September 2004),and the"Water Quality Control Plan for the Tulare Lake Basin Second Edition"(Revised January 2004). The Sacramento River and San Joaquin River Basin Plan is applicable to the DeSilva Gates Quarry Project. Beneficial Uses and Water Quality Objectives. The process of designating — beneficial uses involves defining the resources, services,and qualities of the aquatic system that are the ultimate goals of protecting and achieving high water quality. Beneficial uses of the Delta-Mendota Canal comprise municipal and domestic supply, agricultural supply,warm freshwater habitat, contact and noncontact water recreation,and wildlife habitat(Central Valley RWQCB 1998). The Central Valley RWQCB has established water quality objectives for all _ surface waters in the basin concerning ammonia,bacteria, biostimulatory substances, chemical constituents, color,dissolved oxygen,floating material,oil and grease,pH,pesticides,radioactivity,salinity, sediment, settleable material, suspended material,tastes and odors,temperature, toxicity, and turbidity. _ Specific objectives for concentrations of chemical constituents are applied to bodies of water based on their designated beneficial uses. Specifically the Delta- Mendota Canal has been identified in the State Water Board's"Water Quality Control Plan for Salinity". Industrial and Construction Permitting. The Central Valley RWQCB administers the NPDES stormwater permitting program for industrial and construction activities in the Central Valley region. Stormwater discharges from industrial facilities are subject to the permitting requirements of the NPDES _ General Permit for Discharges of Storm Water Associated with Industrial Activities excluding Construction Activities(General Industrial Permit). The regulations defining discharges of storm water associated with industrial _ activities were published on November 16, 1990;EPA identified 11 categories of industrial activities that are required to obtain permit coverage. To obtain authorization for continued and future stormwater discharge under the General Industrial Permit,each facility operator must submit an NOI. All stormwater discharges from industrial sites must meet all applicable provisions of Sections 301 and 402 of CWA. As such, stormwater discharges from an industrial site must not cause or contribute to a violation of any applicable water quality standards, which include all federal receiving water standards and all state standards under the Basin Plan. These provisions require control of pollutant discharges using the best available technology(BAT)that is economically _ achievable to prevent and reduce pollutants and to meet water quality standards. DeSilva Gates Quarry Project �- Draft Environmental Impact Report 3.G4 dos 06105.0