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<br />arr~fA <br /> <br />Responses to <br />Environmental Checklist <br />For CEQA Compliance <br /> <br />C. Substantially alter the existing drainage pattern of the site or area, including through the <br />alteration of the course of stream or river, or substantially increase the rate or amount of <br />surface runoff in a manner, which would result in flooding on or off-site? <br />D. Create or contribute runoff water which would exceed the capacity of existing or planned <br />storm water drainage systems or provide substantial additional sources of polluted run- <br />off? <br />L. Result in increased impervious surfaces and associated runoff? <br />M. Create a significant adverse environmental impact to drainage patterns due to changes in <br />runoff flow rates or volumes. <br /> <br />No Impact <br /> <br />The City of Santa Ana has a Master Plan of Drainage to guide the construction of adequate drainage <br />facilities in the City. The facilities include a series of underground storm drain systems, open storm drain <br />systems, catch basins and natural drainages. A significant drainage impact can occur when existing rates <br />of surface water runoff are increased and existing drainage facilities are unable to accommodate the <br />additional rates of runoff. Existing rates of surface water runoff can increase through the introduction of <br />additional amounts of impervious surfaces, or through changes to existing drainage patterns. Approval of <br />the proposed amendments to the Municipal Code to establish an ordinance for the regulation of indoor <br />sporting facilities would not alter existing drainage patterns or increase existing rates of surface water <br />runoff, in that approval of the proposed ordinance would not introduce additional impervious surfaces or <br />involve the development of any activities that would impact existing drainage patterns. Through the <br />conditional use permit process, future indoor sporting facilities implemented under the proposed ordinance <br />would be evaluated for potential drainage impacts. <br /> <br />F. Place housing within a 100-year floodplain, as mapped on a federal Flood Hazard <br />Boundary or Flood Insurance Rate Map or other flood hazard delineation map? <br />G. Place within a 100-year floodplain structures which would impede or redirect flood flows? <br />H. Place housing within a 100-year floodplain, as mapped on a federal Flood Hazard <br />Boundary or Flood Insurance Rate Map or other flood hazard delineation map? <br /> <br />No Impact <br /> <br />The City's General Plan identifies that portions of Santa Ana are within the 1 DO-year flood Zone. Approval <br />of the proposed amendments to the Municipal Code to establish an ordinance for the regulation of indoor <br />sporting facilities would not facilitate development within areas subject to 1 DO-year flood risks. <br /> <br />J. Result in significant alteration of receiving water quality during or following construction. <br />K. Could the proposed project result in increased erosion downstream? <br /> <br />No Impact <br /> <br />Erosion refers to the removal of soil from exposed bedrock surfaces by water or wind. The effects of <br />erosion are intensified with an increase in slope, the narrowing of runoff channels and by the removal of <br />groundcover, which leaves the soil exposed. Approval of the proposed ordinance would not result in <br />erosion impacts, in that the proposed amendments would not involve any construction activities that would <br />disturb or uncover soils to facilitate erosion impacts. Through the conditional use permit process, future <br />indoor sporting facilities implemented under the proposed ordinance would be evaluated for potential soil <br />erosion impacts and would be subject to the City's erosion control requirements. <br /> <br />75B-31 <br /> <br />7 <br />