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' BENDER READY-MIX CONCRETE MANUFACTURING PROJECT <br />Initial Study/Mitigated Negative Declaration <br />' 4.9 HYDROLOGY AND WATER QUALITY <br /> <br /> <br />I <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> Left-Than <br />Would the project: Potentially- Significant Less Than <br />No - <br /> Significant Impact With Significant Impact <br /> Impact Mitigation Impad :. <br /> Incorporated . <br />a. Violate any water quality standards or waste discharge <br /> <br />requirements? ? <br />b. Substantially deplete groundwater supplies or interfere <br />substantially with groundwater recharge such that there <br />would be a net deficit in aquifer volume or a lowering of the <br />local groundwater table level (e.g., the production rate of ? <br />pre-existing nearby wells would drop to a level which would <br />not support existing land uses or planned uses for which <br />permits have been granted)? <br />c. Substantially alter the existing drainage pattern of the site or <br />area, including through the alteration of the course of ? <br />stream or river, in a manner which would result in <br />substantial erosion or siltation on- or off-site? <br />d. Substantially alter the existing drainage pattern of the site or <br />area, including through the alteration of the course of a <br />stream or river, or substantially increase the rate or amount ? <br />of surface runoff in a manner which would result in flooding <br />on- or off-site? <br />e. Create or contribute runoff water which would exceed the <br />capacity of existing or planned storm water drainage ? <br />systems or provide substantial additional sources of <br />polluted runoff? <br />f. Otherwise substantially degrade water quality? ? <br />g. Place housing within a 100-year flood hazard area as <br />mapped on a federal Flood Hazard Boundary or Flood ? <br />Insurance Rate Ma or other flood hazard delineation map? <br />h. Place within a 100-year flood hazard area structures which <br /> <br />would impede or redirect flood flows? ? <br />i. Expose people or structures to a significant risk of loss, <br />injury or death involving flooding, including flooding as a ? <br />result of the failure of a levee or dam? <br />j. Inundation by seiche, tsunami, or mudflow? ? <br />a) Violate any water quality standards or waste discharge requirements? <br />Less Than Significant Impact With Mitigation Incorporated. As stated within Response 4.6(b), the <br />' primary water quality concern related to the proposed project would be potential erosion impacts during <br />construction activities. Grading and excavation activities associated with construction of the project <br />would expose soils to potential short-term erosion by wind and water. Since the project impact area <br />' would be below one acre, the proposed project would not be subject to the requirements of the <br />Construction General Permit under the NPDES program administered by the Santa Ana RWQCB. <br />However, project construction would be required to comply with Chapter 18, Article VII, Water Pollution, <br />of the City's Municipal Code. The Municipal Code includes numerous measures for the control of <br />erosion and urban runoff for both new development and redevelopment. Upon adherence to these <br />requirements, impacts in this regard would be less than significant (refer to Mitigation Measure GEO-2). <br />JULY 2011 4.9-1 HYDROLOGY AND WATER QUALITY <br />31A-65