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Environmental Checklist ~~~~~~~ For CEQA Compliance B. Less Than Significant Impact. The proposed project is currently developed and consists of 60% of impermeable surfaces (asphalt, concrete, and buildings) and approximately 40% of hard-packed unpaved sun`aces. Furthermore, low topographic relief on site is not significant; therefore, impacts associated with substantial erosion or loss of topsoil would be less than significant during construction or post-construction of the proposed project. C. No Impact. The project site has been previously developed and does not contain any unique geological or physical feature. No impact would occur. D. Less Than Significant with Mitigation Incorporated. According to City of Santa Ana General Plan Land Use Element, the proposed project is not located in an area of subsidence (City of Santa Ana 1998: A-40). The project area is generally flat, and there is no indication that recent landslides or unstable slope conditions exist on or adjacent to the project site that would otherwise result in a landslide hazard to the proposed project (Associated Soils Engineering 2006). However, the project is located in an area of high to very high liquefaction (City of Santa Ana 1998: A-40, Associated Soils Engineering 2006). All demolition would occur in accordance with building and safety standards as specified by the City Building Division. All site preparation (including grading) and construction of the residential units would occur in accordance with building and safety standards as specified by the City Building Division, which inherently provide for measures to reduce the potential impacts of liquefaction to structures. In addition, the geotechnical study provides for certain design measures during site preparation, excavation, grading, and construction, which would also reduce any potential impacts related to liquefaction to less than significant (Associated Soils Engineering, 2006). Therefore, the impacts to structures can be mitigated to less than significant with the implementation of Mitigation Measure GEO-1 identified above. E. No Impact. Sewer access is available throughout the project area. No septic tanks or alternative wastewater disposal systems are included as part of the proposed project. The project site would tie into existing 8-inch sewer line located along South Fairview Street. No impacts would occur. VII. Hazards and Hazardous Materials A. Less Than Significant with Mitigation Incorporated. Implementation of the proposed project may be associated with the disposal of hazardous substances as a result of the demolition of the various structures. Development of the proposed project would require the demolition of existing interior and exterior features on the site. The buildings on site were constructed between 1961 and 1962, and no extensive renovations to the existing structure have occurred since that time (TRC 2006). Asbestos-containing building materials have been previously identified in the existing warehouse (TRC 2006). In addition, due to the building's age, lead-based paint and/or lighting ballasts containing polychlorinated biphenyl (PCB) may be present (TRC 2006). Mitigation Measure HM-1 would ensure that proper disposal of any hazardous materials, if discovered, would be followed as directed by the City of Santa Ana Building Division and Fire Department. Impacts are therefore considered less than significant with mitigation incorporated. Alton Court August 2007 Initial Study/Mitigated Negative Declaration 3-24 J&S 00635.07 75A-90