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REGIONAL AND LOCAL REGULATIONS San Joaquin General Plan 2010 The San Joaquin General Plan contains the following drainage policies that are applicable to the proposed project. Public Health and Safety Element(Flood Hazards) ► Policy 1.New residential,public,commercial,and industrial development shall be required to have protection from a 100-year flood. ► Policy 2.New areas of residential development shall be zoned for development only if the area has 100-year flood protection. Mountain House Master Plan 1994 The following drainage measures and policies from the Mountain House Master Plan are applicable to the proposed project. Grading Standards(Section 4.22) ► Policy 4.2.2(a).Grading practices in the community shall minimize risk to health and property from improper control of storm-drain water runoff, erosion,and sedimentation. ► Policy 4.2.2(d).Grading operations shall be planned and implemented to efficiently control erosion and sedimentation. Soils Geologic and Seismic Hazards(Section 6.8.3) ► Policy 6.8.3(b).Adequate efforts shall be made during design and construction of urban improvements, including buildings,to control or eliminate,if possible, soil erosion and sedimentation associated with construction activities. Storm Drainage and Flood Protection(Section 15.3) ► Policy 15.3(a).Adequate storm transport systems shall be provided to ensure that all off-site drainage from watersheds shall be safely conveyed to terminal drains. ► Policy 15.3(b). Off-site drainage may be merged with urban runoff as a means of conveyance to terminal drains,providing that the urban runoff has been treated according to BMPs as provided for by applicable water-quality-control regulations. ► Implementation 15.3(a).Erosion shall be minimized by using appropriate streambed protection energy dissipaters at transitions from supercritical to subcritical flow, at the confluence of channels, at the downstream location of culverts, and at channel transitions. Streambed protection shall be provided by planting appropriate species of plants. Streambed is defined in this application as the constructed floodplain and channels and does not include existing creek beds that will not be disturbed. ► Implementation 15.3(b).Detailed studies for each watershed area shall be prepared and used in the design of each segment of storm facilities required for each Specific Plan, and shall be completed and approved before the approval of Specific Plans. College Park at Mountain House Specific Plan III Draft EIR EDAW San Joaquin County 4.7-7 Drainage