55A - RESO - ADDENDUM BRISTOL STREET WIDENING

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ENVIRONMENTAL IMPACT REPORTADDENDUM Bristol Street Widening Phase INS— Washington Avenue to 1716 Street development and implementation of a Stormwater Pollution Prevention Plan (SWPPP) during construction activities. The SWPPP requires construction contractors to implement best management practices (BMPs) to reduce sediment from impacting the storm water system. The increased erosion impact due to the intersection widening would not be substantially greater than previously analyzed. c.) Be located on a geologic unit or soil that is unstable, or that would become unstable as a result of the project, and potentially result in on- or off-site landslide, lateral spreading, subsidence, liquefaction or collapse? The 1990 FEIS/EIR indicated that there are no instances of undisturbed, natural soils. The Project site is underlain by well - drained alluvial fan or flood plains and is not included in the areas of high subsidence or high liquefaction hazard (but located south of an area identified as having high to medium subsidence for liquefaction). The Project area is fully developed with urban uses within the City of Santa Ana. The proposed Project would be constructed in accordance with the standards of the Uniform Building Code (UBC). The proposed Project would not create greater impact than previously analyzed in the 1990 FEIS/EIR. Mitigation Measures No new additional mitigation measures are required. d.) Be located on expansive soil, as defined in Table 18 -1 -B of the Uniform Building Code (1994), creating substantial risks to li/e or property? The proposed Project would not include the construction of any structures other than relocation of existing utilities. The proposed Project would not create substantial risks to life or property and the proposed Project would not create greater impacts than previously analyzed in the 1990 FEIS /EIR. Mitigation Measures No new additional mitigation measures are required. e.) Have soils incapable oj'adequately supporting the use of septic tanks or alternative waste water disposal systems where sewers are not available for the disposal of waste water? The proposed Project would not generate any sewage or wastewater and would not require installation of any septic tanks or alternative wastewater systems. No impacts are anticipated in this regard. Mitigation Measures No new additional mitigation measures are required. ANA 111 -334 (PER- 02 -01) CITY OF SANTA ANA (01/30/2014 REVS) 132897 CM PAGE 34 55A -43