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ENVIRONMENTAL IMPACT REPORT ADDENDUM <br />Bristol Street Widening Phase ILIA — Civic Center Drive to Washington Avenue <br />a.)iii Seismic-relatedgroundfailtire, including liquefaction? <br />The Project site is not identified by the 1990 FEIS/EIR as having a high liquefaction potential but is near <br />areas classified as having high to medium liquefaction potential. In addition, the Project would be <br />constructed to achieve the standards outlined in the California Building Code to reduce impacts in this <br />regard. Consequently, the proposed Project would not expose people or structures to potential liquefaction <br />impact. The proposed widening would not result in greater impacts than previously analyzed in the 1990 <br />FEIS/EIR. <br />Mitigation Measures <br />No new additional mitigation measures are required. <br />a.)iv Landslides? <br />The proposed Project site is generally flat and does not contain any significant slopes. The proposed <br />Project would not result in greater impacts than previously analyzed in the 1990 Final EIS/EIR. <br />Mitigation Measures <br />No new additional mitigation measures are required. <br />b.) Result in substantial soil erosion or the loss of topsoil? <br />Exposure of barren rock and soil surfaces during construction would result in soil erosion. However, <br />considering the slight gradient, anticipated erosion impact is minimal. Furthermore, the Project would be <br />subject to National Pollutant Discharge Elimination System (NPDES) permitting regulation, including the <br />development and implementation of a Stormwater Pollution Prevention Plan (SWPPP) during <br />construction activities. The SWPPP requires construction contractors to implement best management <br />practices (BMPs) to reduce sediment from impacting the storm water system. The increased erosion <br />impact due to the intersection widening would not be substantially greater than previously analyzed. <br />c.) Be located on a geologic unit or soil that is unstable, or that would become unstable as a result of <br />the project, and potentially result in on- or off -site landslide, lateral spreading, subsidence, <br />liquefaction or collapse? <br />The 1990 FEIS/EIR indicated that there are no instances of undisturbed, natural soils. The Project site is <br />underlain by well -drained alluvial fan or flood plains and is not included in the areas of high subsidence <br />or high liquefaction hazard (but located south of an area identified as having high to medium subsidence <br />for liquefaction). The Project area is fully developed with urban uses within the City of Santa Ana. The <br />proposed Project would be constructed in accordance with the standards of the Uniform Building Code <br />(UBC). The proposed Project would not create greater impact than previously analyzed in the 1990 <br />FEIS/EIR. <br />Mitigation Measures <br />No new additional mitigation measures are 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 />ANA 305-011 (PER 02) CITY OF SANTA ANA (01/19/2015) YU PAGE 39 <br />