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<br />Q. <br /> <br />Have a potential1y significant adverse impact on <br />groundwater quality? <br /> <br />No Impact <br /> <br />The City of Santa Ana receives 66% of its water from underground <br />water supplies. The underground water basin in the City ranges <br />from -50-feet to +40-feet above sea level. Presently, the City <br />pumps underground water from 21 water wells. Fourteen of the <br />water wells pump ground water into small surface reservoirs. The <br />remaining seven water wells pump underground water into the <br />City's distribution system. Approval and implementation of the <br />proposed project would not impact underground supplies, in that <br />the proposed project would not involve any activities that would <br />encroach into the underground water basin, impact the quality of <br />underground water supplies or prevent the recharge of <br />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 stor.m 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 />Less Than Significant Impact <br /> <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. Approval and implementation of the proposed <br /> <br />12 <br /> <br />~~~-~o <br />