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Mtia[Study—LID Annexation Board's(SWRCB's) 1995 Water Quality Control Plan for the San Francisco Bay/Sacramento-San Joaquin Delta Estuary(1995 Bay-Delta Plan)and the CALFED Bay-Delta Program. All urban development within the project region is required to be protected from flooding. The design standard for flood protection is established by the Federal Emergency Management Agency(FEMA), with the minimum level of flood protection for new development to be the 1-in-100 Annual Exceedance Probability(AEP)(i.e., 100-year flood event). FEMA publishes Flood Insurance Rate Maps(FIRMS) that identify which land areas are subject to flooding.These maps provide flood information and identify zones having varying degrees of flooding potential. The State Reclamation Board also hasjurisdiction over flood control in the Central Valley region of California. It is responsible for ensuring the serviceability of levees and requires permits for any activity that may affect the capacity of the flood control system. The storm drainage design standards for both the City of Lathrop and San Joaquin County require that a drainage report be prepared for all subdivisions greater than 25 acres in size.The report must include maps showing drainage basins relative to the project,and sub basins within the project,with catch basin and inlet locations and calculations of design runoff before and after subdivision development. Numerous regulatory statutes exist that specifically address water quality. Both federal and state regulatory authority exists for the control of water quality in surface waters of California, including the San Joaquin River and the Delta. Key elements of the federal and state regulatory processes are listed below. Clean Water Act The U.S. Environmental Protection Agency(EPA) is the lead federal agency responsible for water quality management.The Clean Water Act(CWA)is the primary federal law that governs and authorizes water quality control activities by the EPA as well as the individual states.Various elements of the CWA address water quality, including water quality regulations under Volume 40 of the Code of Federal Regulations(40 CFR). Section 303 of the CWA requires states to adopt water quality standards for all surface waters of the United States.As defined by the act,water quality standards consist of two elements: (1)designated beneficial uses of the water body in question and(2)criteria that protect the designated uses. Section 304(a)requires EPA to publish advisory water quality criteria that accurately reflect the latest scientific knowledge on the kind and extent of all effects on health and welfare that may be expected from the presence of pollutants in water. Where multiple uses exist,water quality standards must protect the most sensitive use. National Toxics Rule and California Toxics Rule In 1992,EPA promulgated the National Toxics Rule(NTR)under the CWA to establish numeric criteria for priority toxic pollutants. The NTR established water quality standards for 42 pollutants for which Section 304(a)water quality criteria exists but that were not covered under California's statewide water quality regulations. As a result of the court-ordered revocation of California's statewide water quality control plans in September 1994, EPA initiated efforts to promulgate additional federal water quality standards for California. In May 2000, EPA issued the California Toxics Rule(CTR),which addresses all the priority pollutants for which EPA has issued Section 304(a)numeric criteria that were not included in the NTR. Section 304(a)numeric criteria are those CWA criteria,established by the EPA on a pollutant-by-pollutant basis, required to safeguard the chemical, physical,and biological integrity of a water body. NPDES Permit Program_ 42