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ENVIRONMENTAL IMPACT REPORT ADDENDUM Bristol Street and Memory Lane Intersection Improvements —Project No. 17-6883 Certified 1990 FRIS/EIR Mitigation Measures: No 1990 FEIS/EIR mitigation measures are applicable Mitigation Measures: No additional mitigation measures are required. b) Result in substantial soil erosion or the loss of topsoil? Exposure of barren rock and soil surfaces during coustmction would result in soil erosion. However, considering the slight gradient, the anticipated erosion impact would be nominal. The proposed Project would not result in greater impacts than previously analyzed in the 1990 FEIS/EIR. Certified 1990 FRIS/EIR Mitigation Measures: C-2 Straw or other suitable materials will be placed over uncovered soils, as needed, during street construction activities. This would reduce the amount of erosion. Mitigation Measures: No additional mitigation measures are required. C) Be located on a geologic unit or soil that is unstable, or that would become unstable us a result of the project and potentially result in on- or off-site IandvHde, lateral sprealmg, subsidence, Hguefactum or collapse? The 1990 FEIS/EIR indicated t hatthere are no instances of undisturbed, natural soils. TheProject site located in an area identified as having high to medium subsidence for liquefaction. However, the Project area is fully developed with urban uses within the City of Santa Ana and the proposed Project would be constructed in accordance with the standards of the Uniform Building Code (UBC). Implementation of 1990 FEIS/EIR mitigation measure B-2, to replace surface level structures with stmcMres that have extensive subsurface footings that reach stable material would reduce any structural impacts from ground failure to less than significant. The proposed Project would not create greater impacts than previously analyzed in the 1990 FEIS/EIR. Certified 1990 FRIS/EIR Mitigation Measures: Refer to 1990 FEIS/EIR Mitigation Measure B-2. Mitigation Measures: No additional mitigation measures are required. d) Be located on expansive soil as defused in Table ]8-]-B of the Unafbrm Building Code (1994), creafing substantial risks to bye or properly? The proposed Project would not include construction of any habitable stmcmres nor would the Project increase the number of persons at the Project site Thus, 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. Certified 1990 FRIS/EIR Mitigation Measures: Refer to 1990 FEIS/EIR Mitigation Measure B-2. Mitigation Measures: No additional mitigation measures are required. e) Have saZv incapable of adequately supporting the use of septic tanks or alternative waste wader disposal systems where sewers are rat avatablefor the disposal ofwaste seater? The proposed Project would not generate any sewage or wastewater and would not require installation of any septic tanks or altemative wastewater systems. No impacts are anticipated in this regard and the proposed Project would not create greater impacts than previously analyzed in the 1990 FEIS/EIR. Certified 1990 FRIS/EIR Mitigation Measures: No 1990 FEIS/EIR mitigation measures are applicable Mitigation Measures: No additional mitigation measures are required. Final I December 2017 3-11 Environmental Consequences City Council 14 – 59 2/17/2026