ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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BMPs shall be utilized to limit urban pollutants from entering water courses; and that compliance with the RWQCB regulations and standards to maintain and improve groundwater quality in Manteca shall be required. City of Manteca Storm Drain Master Plan The City of Manteca's Storm Drain Master Plan(May 2006)is based on the City's Drainage Design Criteria supplemented by the SSJID's requirements and standards, San Joaquin County's Improvement Standards, and the County Hydrology Manual. These standards are further supplemented by design practices of other cities and counties and by the California Stormwater Quality Association Stormwater Best Management Practice Handbook (City of Manteca 2004). The policies and criteria included in the Storm Drain Master Plan(SDMP)are designed to guide and set minimum standards for the design of storm drainage conveyance,retention facilities, and drainage pump stations in the city. Storm drain design must conform to the City of Manteca's current SDMP and standard Plans and Specifications (City of Manteca 2004). The City's SDMP includes the following drainage requirements and design standards that are relevant to the project: 1. all stormwater improvements shall comply with the requirements of the SSJID agreement with the City; 2. operation of stormwater facilities shall comply with SSJID requirements to eliminate uncontrolled inflows to drains and laterals; 3. pump stations shall be designed with a minimum of one standby pump; 4. detention basin pump stations shall be designed to discharge the 10-year,48-hour storm volume; and 5. minimum pipe diameter of storm drains shall be 12 inches. WATER QUALITY Numerous State and federal acts,rules,plans,policies, and programs define the framework for regulating water quality in California. The following discussion focuses on water quality requirements, as they are applicable to the Manteca WQCF and receiving water quality in the San Joaquin River. Federal Water Quality Rules, Regulations, Plans and Policies Clean Water Act and Associated Programs The U.S. Environmental Protection Agency(EPA)is the primary federal agency responsible for water quality management. The Clean Water Act of 1972 (CWA) is the primary federal law that governs and authorizes water quality control activities by the EPA as well as the states. The law authorizes EPA to set point-source effluent limits for industry and publicly owned treatment works (POTWs) and requires states(or EPA in the event of default by states)to set water quality standards for contaminants in surface waters. The CWA also authorizes EPA to delegate many permitting, administrative, and enforcement aspects of the law to State governments. In such cases,however, EPA still retains oversight responsibilities. In California, such responsibility has been delegated to the State,which administers the CWA through the State Water Resources Control Board(SWRCB)and the nine RWQCBs. EDAW DER Hydrology and Water Quality 4.9-10 City of Manteca