31A - CUP 2009-11 - 2000 N FAIRVIEW STREET

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Responses to Environmental Checklist For CEQA Compliance A-3. Seismic-related ground failure, including liquefaction? Less Than Significant Impact Soil liquefaction occurs when loose soil deposits below the water table are subject to large ground accelerations generated from seismic events. According to the City's General Plan Land Use Element EIR, the project site is located in an area that is characterized with high to medium liquefaction hazard potential. To minimize potential liquefaction impacts, the proposed project would be subject to Seismic Shaking Standards of the 2007 California Standards Building Code. Additionally, a soils and geotechnical report is required as part of the plan check review for all new construction. Compliance with the recommendations of the report, including, but not limited to, measures associated with the site preparation, fill placement and compaction, temporary and permanent dewatering, groundwater, soil improvements techniques, seismic design features, excavation stability, soil stabilization, pavements, surface draining, cement type and corrosion measures, erosion control, shoring and internal bracing and plan review are required. Compliance with the Building Code would reduce potential liquefaction impacts to a level considered less than significant. A-4. Inundation by seiche, tsunami or mudflow? A-5 Landslides? A-6 Flooding, including flooding as a result of the failure of a levee or dam? A-7 Wildland fires, including where wildfires are adjacent to urbanized areas and where residences are intermixed with wildland? No Impact The project site is flat without any topographical relief. According to the City's General Plan, there are no landslide planes on the project site. Therefore, implementation of the proposed project would not result in adverse impacts in regards to landslides. Additionally, the proposed project would not expose people to a significant risk of loss, injury, or death involving inundation by a tsunami, seiche or mudflow. Impacts by tsunami are associated with proximity to the ocean. The project site is located approximately 11 miles from the Pacific Ocean, which is a sufficient distance to protect the site from such impacts. The closest enclosed bodies of water that could result in an earthquake induced seiche are the Prado Dam located 16 miles northeast of the project site near the City of Corona, and the Santiago Dam located approximately 10 miles east of the project site in Silverado. The Santa Ana River Main Stem Project has implemented flood control improvements to both the Prado Dam and Lower Santa Ana River which has reduced the risk of inundation in the event of a seiche in Prado Dam. Therefore, there would be no impact to the project site as a result of overflow caused by seiche. The project site located on a parcel with limited topographical relief. The project site is not located downhill from any slope of sufficient size to cause mudflows. Finally, there are no wildlands in the immediate vicinity of the proposed project site. Consequently, development of the proposed project would not result in the exposure of people or structures to hazards associated with wildland fires. Therefore, no impact would occur. B. Would the project result in substantial soil erosion or the loss of topsoil? Less than Significant Impact Erosion refers to the removal of soil from exposed bedrock surfaces by water or wind. The effects of erosion are intensified with an increase in slope, the narrowing of runoff channels and by the removal of groundcover, which leaves the soil exposed. Construction operations for the proposed project would require excavation of onsite soils. The uncovered soils on the project site could potentially result in erosion and sedimentation impacts to onsite and offsite drainage facilities absent appropriate measures 31 A-42