75A - PH BRISTOL ST MEMORY LN PROJECT

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ENVIRONMENTAL IMPACT REPORT ADDENDUM Bristol Street and Memory Lane Intersection Improvements — Project No. 17-6883 • Subsection C, Erosion Impacts; and • Subsection F, Water Quality. Would theproject. a) Expose people or structures to potential substantial adverse effects, including the risk of loss injury, or death involving. i) Rupture of a known earthquake fault, as delineated on the nmst recent Alquist-Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area or based on other substantial evidence of a known fault? Refer to Division of Mines and Geology Special Publication 42. The City of Santa Ana is not included in the Alquist-Priolo Earthquake Fault Zoning Map10. The Project site is not underlain by an active fault. The closest faults are the EI Modeno Fault, approximately eight miles to the northeast and the Newport -Inglewood Fault approximately 15 miles to the southwest. The proposed Project would not result in greater impacts than previously analyzed in the 1990 FEIS/EIR. Certified 1990 FEIS/EIR Mitigation Measures: No 1990 FEIS/EIR mitigation measures are applicable. Mitigation Measures: No additional mitigation measures are required. ii) Strong seismic ground shaking? The El Modeno fault is the closest fault to the Project site and is the most likely source of ground shaking impacts". The Project proposes intersection improvements and would not expose people or structures to adverse ground shaking impact. The proposed Project would not result in greater impacts than previously analyzed in the 1990 FEIS/EIR. Certified 1990 FEIS/EIR Mitigation Measures: No 1990 FEIS/BIR mitigation measures are applicable. Mitigation Measures: No additional mitigation measures are required. iii) Seisrnic-related ground failure, including liquefaction? According to the City's General Plan, the Project site is identified as having high -medium liquefaction potential. However, the Project does not propose any new habitable structures. Implementation of 1990 FEIS/EIR Mitigation Measure B-2, to replace surface level structures with structures that have extensive subsurface footings (such as traffic signals) that reach stable material would reduce any structural impacts from ground failure to less than significant. The proposed Project would not result in greater impacts than previously analyzed in the 1990 FEIS/EIR. Certified 1990 FEIS/EIR Mitigation Measures: B-2 Consideration will be given to installing and replacing surface level structures such as street lights, traffic signals and utility poles, with structures that have extensive subsurface footings that reach stable material. Mitigation Measures: No additional mitigation measures are required. iv) Landslides? The proposed Project site is generally flat and does not contain any significant slopes. The proposed Project would not result in greater impacts than previously analyzed in the 1990 FEIS/EIR. 10 City of Santa Ana, City of Sana Ana General Plan, adopted September 1982, as amended. California Geological Survey, Fault Activity Map of California, http://maps.conservation.ca.gov/cgs/fam/ App/index.html, accessed August 3, 2017. Draft I November 2017 3-10 Environmental Consequences 75A-39