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deep is prohibited, unless the local land use agency certifies that 200-year flood protection has been provided or that"adequate progress" has been made toward provision of 200-year flood protection by 2025. The project site is not in an area that is potentially exposed to 200-year flooding more than three feet deep; therefore, SB 5 requirements do not apply. California Government Code Section 65302(g) requires local governments to assess the potential impacts a dam failure might have on their jurisdiction. The San Joaquin County General Plan Background Report indicates that the project site could potentially be subject to flooding from dam failure at Camanche Reservoir and at New Hogan Dam (San Joaquin County 2016a). Environmental Impacts and Mitigation Measures a)Violation of Water Quality Standards. Project development and operation would lead to contamination of storm water runoff with fuels, oils, metals, and other substances associated with motor vehicles. As described in Chapter 2.0, Project Description, storm water drainage from the project site is proposed to be collected to two basin sites. In addition, as noted in Section 3.7, Geology and Soils, construction activities would disturb soils and soil materials, which could be transported off site by runoff and could eventually enter surface waters, mainly Duck Creek. Construction impacts on water quality would be mitigated through the implementation of BMPs set forth in the SWPPP, described in Section 3.7, Geology and Soils. The SWPPP must list BMPs that would be implemented to prevent soil erosion and discharge of other construction-related pollutants that could contaminate nearby water resources. Additionally, the SWPPP must contain a visual monitoring program, and a chemical monitoring program for nonvisible pollutants if there is a failure of the BMPs. As noted, surface water quality in the County is maintained through implementation of construction and post-construction activities described in the County's Water Quality Plan. Storm water from areas of new development must be treated using applicable post- construction BMPs specified in the SWQCCP. Specifically, as a condition of approval by the County, a registered professional engineer shall design the site to treat the 85th percentile storm as defined in the County's 2021 SWQCCP. These measures will be specified and subject to County review and approval during the design phase of the project. Developers are required to enter into an agreement for maintenance of the post- construction BMPs, which would minimize water quality impacts of the project. With implementation of these actions, project impacts on water quality would be less than significant. b) Groundwater Supplies and Recharge. The project would not involve any wells or withdrawal of groundwater, thereby avoiding direct impacts on groundwater supplies. The project proposes to connect to the water system of Cal Water. In the Stockton area, Cal Water obtains most of its water supply Pock Lane Public Review Draft IS/MND 3-46 May 2022