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ENVIRONMENTAL IMPACT REPORTADDENDUM <br />Bristol Street Widening Phase IIIB — Washington Avenue to 17'h Street <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 />The proposed Project would not include the construction of any structures other than relocation of <br />existing utilities. The proposed Project would not create substantial risks to life or property and the <br />proposed Project would not create greater impacts than previously analyzed in the 1990 FEIS/EIR. <br />Mitigation Measures <br />No new additional mitigation measures are required. <br />e.) Have soils incapable of adequately supporting the use of septic tanks or alternative waste water <br />disposal systems where sewers are not available for the disposal of waste water? <br />The proposed Project would not generate any sewage or wastewater and would not require installation of <br />any septic tanks or alternative wastewater systems. No impacts are anticipated in this regard. <br />Mitigation Measures <br />No new additional mitigation measures are required. <br />ANA 111 -334 (PER- 02 -01) CITY OF SANTA ANA (11/25/2013 REV2) 132897 CM PAGE 33 <br />55C -48 <br />