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of approval by the County, a registered professional engineer shall design the site to comply with the volume reduction requirement outlined in the SWQCCP. Hydrologic and hydraulic analyses shall be provided and demonstrate that all property, both downstream and upstream of the discharge, will not be subject to a higher flood level as a result of the proposed drainage. The project developer shall submit a drainage report, which shall be prepared by a registered civil engineer in accordance with the San Joaquin County Improvement Standards. The design of drainage facilities shall be approved by the County Director of Public Works prior to issuance of a building permit or approval of the final map. In addition, under County Code Section 9-910.2, storm drain calculations (e.g., hydrology, sub -area map, pipeline, hydraulic design, ponding basin, pump system, etc., if applicable) shall be submitted along with the final map. The County Code requirements would ensure that project storm drainage facilities would be designed to accommodate the anticipated runoff and discharge it so as not to increase the potential for flooding, either on site or downstream. Project impacts related to runoff would be less than significant. c -iv) Flood Flows. The project site is in a minimal flood hazard area. As noted, the only portion of the site in a Special Flood Hazard Area is within the banks of Duck Creek. The project site is also not within a 200 -year floodplain that would flood to a depth of at least three feet; thus, it is outside SB 5 jurisdiction. The project does not propose any structures that may impede or redirect flood flows within Duck Creek. As a condition of approval by the County, any proposed drainage pipes under Duck Creek shall be designed with no impacts to the cross section of Duck Creek. In addition, also, as a condition of approval, an encroachment permit from the Central Valley Flood Protection Board shall be obtained for any work in Duck Creek. An encroachment permit typically contains conditions designed to minimize impacts of work within a stream, including potential flooding impacts. Project impact on flood flows would be less than significant. d) Release of Pollutants in Flood Zone. As noted, the project site is not within a 100 -year or jurisdictional 200 -year floodplain, other than the portion within the banks of Duck Creek, where the project does not propose any development. The project is not near any large bodies of water, so it would not be subject to seiches or tsunamis. As noted in Section 3.9, Hazards and Hazardous Materials, the project would not store large quantities of hazardous materials, so any flood that may occur on the project site would not lead to the release of substantial amounts of pollutants into flood flows. The project would have no impact on the release of pollutants in a flood zone. Pock Lane Public Review Draft IS/MND 3-48 May 2022