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<br />under the amended standards would be evaluated for potential <br />ground water impacts. <br /> <br />The amendments to correct, clarify and update residential front <br />yard fences, definitions, second dwellings units, laundromats, <br />vending machines, townhouses, specific development standards and <br />Specific Development No. 40 zone district would not result in <br />significant impacts to underground water supplies. <br /> <br />C. Substantially alter the existing drainage pattern of the site <br />or area, including through the alteration of the course of <br />stream or river, or substantially increase the rate or amount <br />of surface runoff in a manner, which would result in flooding <br />on or off-site? <br /> <br />D. Create or contribute runoff water which, would exceed the <br />capacity of existing or planned storm water drainage systems <br />or provide substantial additional sources of polluted run-off? <br /> <br />L. Result in increased impervious surfaces and associated runoff? <br /> <br />M. Create a significant adverse environmental impact to drainage <br />patterns due to changes in runoff flow rates or volumes. <br /> <br />No Impacts <br />The City of Santa Ana has a Master plan of Drainage to guide the <br />construction of drainage facilities in the City. The existing <br />drainage facilities in the City include a series of underground <br />storm drain systems, open storm drain systems, catch basins and <br />natural drainages. A significant drainage impact can occur when <br />existing rates of surface water runoff are increased and <br />existing drainage facilities are unable to accommodate the <br />additional rates of runoff. Existing rates of surface water <br />runoff can increase through the introduction of additional <br />amounts of impervious surfaces, or through changes to existing <br />drainage patterns. <br /> <br />Approval of the proposed amendment to the single family <br />residential standards would not alter existing drainage patterns <br />or increase existing rates of surface water runoff, in that the <br />proposed amendment would not involve any activities that would <br />impact existing drainage patterns or increase existing rates of <br />surface water runoff. However, single-family residential land <br />uses developed under the amended standards could result in <br />drainage impacts. Through the City's development review process, <br />single-family land uses developed under the amended standards <br />would be evaluated for potential drainage impacts. <br /> <br />75Bn57 <br />