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ENVIRONMENTAL IMPACT REPORT ADDENDUM <br />Bristol Street Widening Phase IIIB — Washington Avenue to 17`^ Street <br />proposed Project, occurring within an existing developed area, Project impacts are not considered <br />adverse. Therefore, impacts to water quality would be similar to those identified in the 1990 <br />FEIS/EIR. <br />Mitigation Measures <br />No new additional mitigation measures are required. <br />b.) Substantially deplete groundwater supplies or interfere substantially with groundwater recharge <br />such that there would be a net deficit in aquifer volume or a lowering of the local groundwater <br />table level (e.g., the production rate of pre - existing nearby wells would drop to a level that would <br />not support existing land uses or planned uses for which permits have been granted)? <br />The proposed widening of Bristol Street, as addressed herein, would not result in increased water <br />consumption and would not deplete groundwater supplies. No impact to groundwater supplies would <br />result from the proposed Project. No mitigation measures are necessary. Impacts would be similar to <br />those identified in the 1990 FEIS /EIR. <br />Mitigation Measures <br />No new additional mitigation measures are required. <br />c.) Substantially alter the existing drainage pattern of the site or area, including through the <br />alteration of the course of a stream or river, in a manner that would result in substantial erosion <br />or siltation on- or off -site? <br />The proposed Project would not alter the existing drainage pattern in the area. Storm drain improvements <br />would include the relocation and/or construction of catch basins and lateral drainage lines as necessary. <br />Therefore, implementation of the proposed Project would not result in a substantial erosion or siltation <br />on- or offsite due to drainage alteration. No mitigation measures are necessary. Impacts would be similar <br />to those identified in the 1990 FEIS /EIR. <br />Mitigation Measures <br />No new additional mitigation measures are required. <br />d) Substantially alter the existing drainage pattern of the site or area, including through the <br />alteration of the course of a stream or river, or substantially increase the rate or amount of <br />surface runoff in a manner that would result in flooding on- or off - site? <br />Refer to response in 3.9 (e.), above. The proposed Project would not result in a substantial increase in <br />impervious ground surfaces, and therefore would not increase the rate or amount of surface runoff so as to <br />create on- or off-site flooding. Impacts would not be greater than previously analyzed in the 1990 <br />FEIS /EIR. <br />ANA I11 -334 (PER- 02 -01) CITY OF SANTA ANA (11/25/2013 REV2) 132897 CM PAGE 39 <br />55B -46 <br />