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<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 />Potentially Significant Unless Mitigation Incorporated <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. <br /> <br />The project site and surrounding project area is currently <br />improved with drainage facilities. Site preparation associated <br />with the proposed project could alter the direction of existing <br />drainage patterns on the project site. Changes to current <br />drainage patterns could potentially impact the capacity of <br />existing drainage facilities within the project area. To ensure <br />that existing drainage facilities are not adversely impacted by <br />the proposed project, the following mitigation measure shall be <br />implemented. <br /> <br />Mitigation Measure <br /> <br />. <br /> <br />Prior to the issuance of building permits, the applicant shall <br />prepare a surface water runoff study to show existing and <br />proposed facilities and methods of draining the site without <br />exceeding the capacity of any street or adjacent storm drain <br />facility. <br /> <br />15 <br /> <br />31A-37 <br />1 7 of 48 <br />