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BENDER READY-MIX CONCRETE MANUFACTURING PROJECT <br />Initial Study/Mitigated Negative Declaration <br />Substantial soil erosion or loss of topsoil is not expected to occur during long-term operations. The <br />proposed project would implement drainage and water quality features on-site that would result in a <br />beneficial long-term impact related to water quality. Thus, impacts in this regard would be less than <br />significant. <br />Mitigation Measures: <br />GEO-2 The construction contractor shall ensure that the project complies with Chapter 18, Article <br />VII, Water Pollution, of the City of Santa Ana Municipal Code. Water quality features <br />intended to reduce construction-related erosion impacts shall be clearly denoted on the <br />grading plans for implementation by the construction contractor. <br />C) Be located on a geologic unit or soil that is unstable, or that would become unstable as a result <br />of the project, and potentially result in an on-site or off site landslide, lateral spreading, <br />subsidence, liquefaction or collapse? <br />Less Than Significant Impact With Mitigation Incorporated. Based on analysis provided in <br />Response 4.6(a)(4), the project would not result in impacts related to on-site or off-site landslides. In <br />addition, Response 4.6(a)(3) provides that Mitigation Measure GEO-1 would mitigate impacts related to <br />liquefaction to a less than significant level. <br />Project impacts related to lateral spreading, subsidence, and collapse are not expected to be significant <br />upon implementation of Mitigation Measure GEO-1. The project site has historically been developed <br />with heavy industrial uses and has not experienced impacts related to unstable soils. Given the minor <br />nature of improvements associated with the project, it is not expected that any hazards would occur. <br />However, as stated above, the improvements associated with the project would be designed and <br />constructed in accordance with CBC requirements to minimize any impacts related to lateral spreading, <br />subsidence, and collapse. Thus, impacts in this regard are considered less than significant. <br />Mitigation Measure: Refer to Mitigation Measure GEO-1. No additional mitigation is required. <br />d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (1994), <br />creating substantial risks to life or property? <br />Less Than Significant Impact With Mitigation Incorporated. <br />The project site is underlain by San Emigdio fine sandy loam.' San Emigdio fine sandy loam is a well- <br />drained soil with moderately rapid permeability. As stated above in Response 4.6(c), the project site <br />has historically been developed with heavy industrial uses and has not experienced hazards related to <br />expansive soils. Given the minor nature of improvements associated with the project, it is not expected <br />that any hazards would occur. However, as stated above, the proposed project would be designed and <br />constructed in accordance with CBC requirements to minimize any impacts related to expansive soils. <br />Thus, impacts in this regard are considered less than significant upon implementation of Mitigation <br />Measure GEO-1. <br />Mitigation Measures: Refer to Mitigation Measure GEO-1. No additional mitigation is required. <br />1 U.S, Department of Agriculture, Soil Conservation Service and Forest Service, Soil Survey of Orange County and Western <br />Riverside County, September 1978. <br />JULY 2011 4.6-4 GEOLOGY AND SOILS <br />31A-54 <br /> <br />I <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />r? <br /> <br /> <br /> <br />fl <br /> <br /> <br /> <br /> <br />