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ENVIRONMENTAL IMPACT REPORT ADDENDUM <br />Bristol Street and Memory Lane Intersection Improvements - Project No. 17-E883 <br />Certified 1990 FEIS/EIR Mitigation Measures- No 1990 FEISMIR mitigation measures are applicablew <br />Mitigation Measures: No 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, considering <br />the slight gradient, the anticipated erosion impact would he nominal. The proposed Project would not result in <br />greater impacts than previously analyzed in the 1990 FEISIEIR. <br />Certified 1990 FEISfEIR Mitigation Measures: <br />C-2 Straw or other suitable materials will be placed. over uncovered soils, as needed, during street <br />construction activities. This would reduce the amount of erosion. <br />Mitigation Measures: No additional mitigation measures are required. <br />cj Be located on ageologic unit or soil that is unstable, or 1hid would become unstable as a result of <br />the prgjec� and potentially result in on- or off -site landslide, lateral spreading, subsidence, <br />liquefaction or collapse? <br />The 1990 FEISIEIR indicated that there are no instances of undisturbed, natural soils. The Project site located in an <br />area identified as having high to medium subsidence for liquefaction. However, the Project area is fully developed <br />with urban uses within the .City of Santa Ana and the proposed Project would be constructed in accordance with the <br />standards of the Uniform Building Code (UBC). Implementation of 1990 FEISIEIR mitigation measure B-2, to <br />replace surface level structures with structures that have extensive subsurface footings that reach stable material <br />would reduce any structural impacts from ground failure to less than significant. The proposed Project would not <br />create greater impacts than previously analyzed in the 1990 FEISIEIR. <br />Certified 1990 FEISIEIR Mitigation Measures: Refer to 1990 FEISIIIR Mitigation Measure B-2. <br />Mitigation Measures: No additional mitigation measures are required. <br />d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Corte (1994), <br />creating substantial risks to Aye or property? <br />The proposed Project would not include construction of any habitable structures nor would the Project increase the <br />number of persons at the Project site, Thus, the proposed Project would not create substantial risks to life or <br />property and the proposed Project would not create greater impacts than previously analyzed in the 1990 FEISIEIR. <br />Certified 1990 FEISIEIR Mitigation Measures: Refer to 1990 FEISIEIR Mitigation Measure B-2. <br />Mitigation Measures: No additional mitigation measures are required. <br />e) Have soffs incapable of adequately suppon7ing the use of septic tanks or alterneiive nuste 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 any septic <br />tanks or alternative wastewater systems. No impacts are anticipated in this regard and the proposed Project would <br />not create greater impacts than previously analyzed in the 1990 FEISIEIR. <br />Certified 1990 FEISIEIRMitigation Measures: No 1990 FEISIEIRmitigation measures are applicable <br />Mitigation Measures: No additional mitigation measures are required. <br />Final I December 2017 3-11 Environmental Consequences <br />