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ENVIRONMENTAL IMPACT REPORT ADDENDUM <br />Bristol Street Widening Phase ILIA — Civic Center Drive to Washington Avenue <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 (c), 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 />Mitigation Measures <br />No new additional mitigation measures are required. <br />e.} Create or contribute runoff water which would exceed the capacity of existing or planned storm <br />water drainage systems or provide substantial additional sources of polluted runoff? <br />Refer to response in 3.9 (c.), above. Impacts would be similar to those identified in the 1990 FEIS/EIR. <br />Mitigation Measures <br />No new additional mitigation measures are required. <br />f.) Otherwise substantially degrade water duality? <br />Refer to response in 3.9 (c.), above. Impacts would be similar to those identified in the 1990 FEIS/EIR. <br />Mitigation Measures <br />No new additional mitigation measures are required. <br />ANA 305-011 (PER 02) CITY OF SANTA ANA (01/19/2015) YU PAGE 45 <br />