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Sustainability Plan to the California Department of Water Resources on January 29, 2020. Water Quality The SWRCB has issued a general permit for municipal separate storm sewer systems (MS4s) within California (Order No. 2013-0001-DWQ) under the authority of the National Pollutant Discharge Elimination System (NPDES) program established by the federal Clean Water Act. The Central Valley RWQCB has issued a more specific permit for MS4 systems within its jurisdiction (RWQCB Order R5-2016-0040). This MS4 permit covers the City of Stockton and urbanized areas of San Joaquin County, including the project site. Implementation of MS4 permit requirements include compliance with the Storm Water Quality Control Criteria Plan (SWQCCP), which identifies a range of post- construction Best Management Practices (BMPs) that must be incorporated into development plans, including provisions for control of storm water volumes such that peak existing discharges are not exceeded. Volume control can be achieved through a combination of low-impact development and specific volume control measures, treatment control, and trash control. San Joaquin County Code Chapter 5-10000 regulates storm water management and discharges in the portion of the County covered by the MS4 permit. Specifically, Sections 5-10101 and 10102 prohibit discharges into the County storm drainage system that violate any condition of the MS4 Permit or any other Federal, State, or local regulation. Section 5-10110 allows the County to adopt regulations establishing controls for discharges from new developments and redevelopments as may be appropriate to minimize the discharge and transport of pollutants. Where BMP guidelines or requirements have been adopted by any Federal, State, regional, County, and/or city agency, any activity, operation, or facility which may cause or contribute to storm water pollution or contamination shall comply with such guidelines or requirements as may be identified by the County Director of Public Works. Flooding The Federal Emergency Management Agency (FEMA) delineates the 100-year floodplain of streams. The 100-year floodplain (i.e., the area of occurrence of a flood that is expected once every 100 years on average) is considered a Special Flood Hazard Area that is the area of concern for FEMA's National Flood Insurance Program. The only area in a Special Flood Hazard Area is within the channelized banks of Duck Creek. The remainder of the project site is in Zone X, which indicates areas within a 500-year floodplain (i.e., the area of occurrence of a flood that is expected once every 500 years on average). The 500-year floodplain is not an area of concern for the National Flood Insurance Program. In 2007, the State of California approved SB 5 and a series of related Senate and Assembly bills, known as "the SB 5 Bills," that define the State standard for flood protection in urban areas in the Central Valley as protection from the 200-year flood and establish other requirements for application of the 200-year standard. After July 2, 2016, new development in areas potentially exposed to 200-year flooding more than three feet Pock Lane Public Review Draft IS/MND 3-45 May 2022