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2014 -2021 SANTA ANA HOUSING ELEMENT AND PUBLIC SAFETY ELEMENT UPDATES CITY OF SANTA ANA 3. Environmental Analysis undergo sufficient duration and intensity of groundshaking may behave as a fluid for a short period of time. According to the Department of Conservation Seismic Hazard Zones Maps for the Newport Beach, Anaheim, Orange, and Tustin Quadrangle (in which Santa Ana is located in the intersection of these four quadrangles), the City is zoned as an area where historic occurrence of liquefaction, or local geological, geotechnical and groundwater conditions indicate a potential for permanent ground displacements (DOC 1997; 1998; 1998; 2001). In addition, according to Exhibit 5 of the City's General Plan Seismic Safety Element, the potential for liquefaction hazards ranges from very low in the northeastern portion of the City to very high in the southwestern portion of the City. The Harbor Corridor Specific Plan area has medium risk of liquefaction while the Metro East and Transit Zoning Code areas have very low risk of liquefaction. Nevertheless, as stated above, any future development that occurs under the Housing Element would be subject to future CEQA review and consideration of potential soil related impacts. New developments would also be subject to CBC standards and local building code regulations for seismic- design features. Thus, impacts to seismic ground failure due to the adoption of the Housing Element would be less than significant. iv) Landslides? No Impact. The City is relatively flat and there are no significant slopes or hills in the vicinity of future development sites. Thus, Santa Ana has low vulnerability for landslide, mudshde, or rock fall events induced by seismic activity or excessive rainfall. It is anticipated that cut - and -fill grading would be necessary during project development, but no significant slopes are anticipated to occur as a result of project development. Additionally, future projects would be required to comply with CBC standards as previously stated. Therefore, the adoption of the Housing Element would have no impact on exposing people or structures to adverse effects involving landslides. b) Result in substantial soil erosion or the loss of topsoil? Less Than Significant Impact. As described above, Santa Ana is located primarily on flat lands. The City is also 99 percent built out and does not feature substantial undeveloped areas where new development would disturb topsoil. Due to the City's flat topography, soil erosion would not be an issue. New developments on sites larger than 1.0 acres are also required to comply with the National Pollution Discharge Elimination System (NPDES) program's General Construction Permit (GCP) requirements, which include development and implementation of a Storm Water Pollution Prevention Plan (SWPPP). SWPPPs also requite the design and implementation of best management practices (B1VIPs), which would ensure discharge of pollutants from project sites be reduced to the minimum amount as to not cause or contribute to an exceedance of water quality standards. BMPs that can prevent or minimize impacts on soil erosion include practices such as, sediment control, stabilizing slopes, and minimizing soil disturbance. By adhering to the federal and local regulations, development in accordance to the proposed project would not result in significant impacts relating to soil erosion or the loss of topsoil. December 2013 The Planning Center I DC&E • Page 49 75A -71