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III. ENVIRONMENTAL SETTING,IMPACTS AND MITIGATION MEASURES F. HYDROLOGY AND WATER QUALITY 1996; MacIsaac, 1999). Stormwater flows are monitored and analyzed in accordance with NPDES requirements. The facility also has, under roof and within containment areas,existing aboveground storage tanks and containers for petroleum fluids necessary for site operations. A Hazardous Materials Management Plan and Chemical Inventory has been developed and implemented for the facility concerning these fluids. Additionally,an underground diesel storage tank had previously been used at the site but was removed in 1992 and the surrounding soil remediated(Maclsaac, 1999). APPLICABLE PLANS AND POLICIES CITY OF STOCKTON New storm drainage facilities are constructed in accordance with the Storm Drainage Study and Master Plan developed by San Joaquin County (1973) and adopted by the City Council in 1975. The plan covers the entire County including the incorporated cities. It divided metropolitan Stockton into seven study areas and examined deficiencies in the existing systems and recommended design standards. Stormwater Division The City of Stockton Stormwater Division has developed the Model Construction Activities Storm Water Pollution Prevention Plan (1997)to assist local contractors and developers in complying with the requirements of the State Water Resources Control Board's National Pollutant Discharge Elimination System(NPDES)General Permit for Discharge of Storm Water Runoff Associated with Construction Activity(State General Permit). The Stormwater Division developed guidelines for minimum best management practices to prevent and control storm water pollution from new developments during construction and after construction is complete. WATER QUALITY REGULATION The major federal legislation goveming'the water quality aspects of the project is the Clean Water Act(CWA) as amended by the Water Quality Act of 1987. The objective of the CWA is "to restore and maintain the chemical,physical, and biological integrity of the Nation's waters." The State of California's Porter-Cologne Water Quality Control Act(Division 7 of the California Water Code)provides the basis for water quality regulation within California. The State Water Resources Control Board(SWRCB)administers water rights, water pollution control,and water quality functions throughout the state,while the Regional Water Quality Control Boards conduct planning,permitting, and enforcement activities. The project area lies within the jurisdiction of the Central Valley Regional Water Quality Control Board(Regional Board). The Regional Board is responsible for the protection of beneficial uses of water resources within the Central Valley Region. The Regional Board uses planning,permitting, and enforcement authorities to meet this responsibility,and has adopted the Central Valley Region Water Quality Control Plan (Basin Plan)to implement plans,policies,and provision for water quality Stockton Scavenger Transfer Station Expansion III.F.3 ESA/990190