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<br />involve dewatering activities. Implementation <br />project would not result in significant <br />underground water supplies. <br /> <br />of the <br />impacts <br /> <br />proposed <br />to any <br /> <br />C. Substantially alter the existing drainage pattern of the <br />site or area, including through the alteration of the <br />course of stream or river, or substantially increase the <br />rate or amount of surface runoff in a manner, which would <br />result in flooding on or off-site? <br />D. Create or contribute runoff water which would exceed the <br />capacity of existing or planned stor.m water drainage <br />systems or provide substantial additional sources of <br />polluted run-off? <br /> <br />Potentially Significant Impact Unless Mitigation Incorporated <br /> <br />The proposed project would not introduce substantial amounts of <br />new impervious surfaces onto the project site. Existing rates of <br />surface water runoff are not anticipated to increase <br />significantly. Through the City's development review process, <br />the Public Works Agency has determined the existing drainage <br />facilities within the project area could provide adequate <br />drainage for the proj ect . However, final drainage plans would <br />still need to be prepared to determine the size and exact <br />location of onsite drain facilities. <br /> <br />Mitigation Measure <br /> <br />. Prior to issuance of a grading permit, the proj ect <br />applicant shall submit a final surface water runoff <br />evaluation for review and approval showing existing and <br />proposed facilities and methods of draining the site <br />wi thout exceeding the capacity of any street or adj acent <br />storm drain facility. <br /> <br />F. Place housing within a lOO-year floodplain, as mapped on a <br />federal Flood Hazard Boundary or Flood Insurance Rate Map <br />or other flood hazard delineation map? <br /> <br />G. Place within a 100-year floodplain structures which would <br />impede or redirect flood flows? <br /> <br />H. Expose people or structures to a significant risk of loss, <br />injury, or death involving flooding, including flooding as <br />a result of the failure of a levee or dam? <br /> <br />No Impact <br /> <br />The City of Santa Ana is <br />Insurance Program (NFIP). <br /> <br />19 <br /> <br />a participant in the National Flood <br />Communities participating in the NFIP <br /> <br />7 SArA 9 <br />