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4 Environmental Analysis <br /> 4.10 Hydrology/Water Quality <br /> Implementation Program 110: The County shall conform with Alameda County Flood Control and <br /> Water Conservation District's (Zone 7) Wastewater Management Plan and the Basin Plan for the <br /> Central Valley Region (Sacramento River Basin and the San Joaquin River Bay Basin). <br /> The Alameda County Municipal Code, Chapter 15.36 (Grading Erosion and Sediment), regulates <br /> work on private property in the unincorporated areas of the County. Among its purposes are to 1) <br /> safeguard life, limb, health, property, and public welfare; 2) protect creeks, watercourses, and <br /> other drainage facilities from illicit discharges of surface runoff generated in or draining through <br /> the permit work area; and 3) ensure that the construction and eventual use of a graded site is in <br /> accordance with the County general plan and all applicable County ordinances. <br /> The Alameda County Flood Control and Water Conservation District (District) addresses flood <br /> protection for Alameda County residents and businesses. The District implements and maintains <br /> flood control projects that can include natural creeks, artificial channels, levees, pump stations, <br /> dams, and reservoirs. The County's Hydrology & Hydraulics Manual serves as a guide for <br /> minimum design requirements and provides guidance for hydrologic and hydraulic assessments <br /> for all of Alameda County(District 2016). The District is also charged with administering the Clean <br /> Water Program for unincorporated areas of Alameda County, the 14 cities of Alameda County, <br /> the District, and the Zone 7 Water Agency. The District provides administrative and contracting <br /> services for the Alameda Countywide Clean Water Program to help comply with federal and state <br /> requirements to improve water quality and better manage urban stormwater and runoff. <br /> 4.10.3 Thresholds of Significance <br /> A project would result in significant impacts to hydrology and water quality resources if it would: <br /> a) Violate any water quality standards or waste discharge requirements or otherwise <br /> substantially degrade surface or groundwater quality; <br /> b) Substantially decrease groundwater supplies or interfere substantially with groundwater <br /> recharge such that the project may impede sustainable groundwater management of the <br /> basin; <br /> c) Substantially alter the existing drainage pattern of the site or area, including through the <br /> alteration of the course of a stream or river or through the addition of impervious surfaces <br /> in a manner which would: <br /> i) Result in substantial erosion or siltation on- or off-site <br /> ii) Substantially increase the rate or amount of surface run off in a manner which <br /> would result in flooding on- or off-site <br /> iii) Create or contribute runoff water which would exceed the capacity of existing or <br /> planned stormwater drainage systems or provide substantial additional sources of <br /> polluted runoff <br /> iv) Impede or redirect flood flows <br /> d) Occur in a flood hazard, tsunami, or seiche zones, risk release of pollutants due to the <br /> project inundation; Or <br /> e) Conflict with or obstruct implementation of water quality control plan or sustainable <br /> groundwater management plan <br /> Griffith Energy Storage Project 4.10-11 Tetra Tech/SCH 2022120675 <br /> Draft Environmental Impact Report August 2023 <br />