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San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures Development Department Geology,Soils,and Seismicity Regulatory Setting Federal Regulations Section 402 of the Clean Water Act/National Pollutant Discharge Elimination System The federal Clean Water Act(CWA)is discussed in detail in section 3.G, "Surface Water, Stormwater, and Water Quality." However,because CWA .. Section 402 is directly relevant to excavation and grading,additional information is provided here. Amendments in 1987 to the federal CWA added Section 402p,which establishes a framework for regulating municipal and industrial stormwater discharges under the National Pollutant Discharge Elimination System(NPDES)program. As described in section 3.G,"Surface Water, Stormwater,and Water Quality,"the ` EPA has delegated to the State Water Resources Control Board the authority for the NPDES program in California,which is implemented by the state's nine regional water quality control boards. Under the NPDES Phase II Rule,any construction activity disturbing 1 acre or more must obtain coverage under the state's General Permit for Storm Water Discharges Associated with Construction Activity (General Permit). General Permit applicants are required to prepare a notice of intent and a Stormwater Pollution Prevention Plan(SWPPP) and implement and maintain best management practices (BMPs)to avoid adverse effects on receiving water quality as a result of construction activities, including earthwork. State Regulations Alquist-Priolo Earthquake Fault Zoning Act California's Alquist-Priolo Earthquake Fault Zoning Act(PRC Sec. 2621 et seq.),originally enacted in 1972 as the Alquist-Priolo Special Studies Zones Act and renamed in 1994,is intended to reduce the risk to life and property from ` surface fault rupture during earthquakes. The Alquist-Priolo Act prohibits the location of most types of structures intended for human occupancy across the traces of active faults and strictly regulates construction in the corridors along active faults(Earthquake Fault Zones). It also defines criteria for identifying active faults,giving legal weight to terms such as active, and establishes a process for reviewing building proposals in and adjacent to Earthquake Fault Zones. The nearest Alquist-Priolo zone is located along the Greenville Fault approximately 14 miles southwest of the project site. Under the Alquist-Priolo Act, faults are zoned and construction along or across them is strictly regulated if they are"sufficiently active"and"well defined." A fault is considered sufficiently active if one or more of its segments or strands shows evidence of surface displacement during Holocene time(defined for purposes of the act as referring to approximately the last 11,000 years). A fault is considered well defined if its trace can be clearly identified by a trained geologist DeSilva Gates Quarry Project Draft Environmental Impact Report 3.F-7 AS 0570.5.0.5