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Kimley>»Horn <br />yield from the site will remain unchanged since the existing condition is a <br />developed site. <br />Threshold (d) Would the project substantially alter the existing drainage pattern of the site or <br />area, including through the alteration of the course of a stream or river, or <br />substantially increase the rate or amount of surface runoff in a manner which <br />would result in flooding on- or off -site? (CEQA Environmental Checklist: <br />Hydrology and Water Quality) <br />No streams or channels are affected by the Project. The proposed drainage <br />system and pattern largely matches the existing system and pattern. The City, <br />in its Master Plan of Drainage, analyzed potential drainage system deficiencies <br />throughout the City of Santa Ana. No deficiencies were listed near the Project <br />site. Since the proposed development does not increase the overall runoff rates <br />substantially, less than 5%, the site should not contribute to on -site or off -site <br />flooding. <br />Threshold (e) Would the project create or contribute runoff water which would exceed the <br />capacity of existing or planned storm water drainage systems or provide <br />substantial additional sources of polluted runoff? (CEQA Environmental <br />Checklist: Hydrology and Water Quality) <br />The proposed drainage system and pattern largely matches the existing system <br />and pattern. The City, in its Master Plan of Drainage, analyzed potential <br />drainage system deficiencies throughout the City of Santa Ana. No deficiencies <br />were listed near the Project site. Since the proposed development does not <br />increase the overall runoff rates substantially, less than 5%, the site should not <br />contribute to exceeding existing storm water drainage systems. <br />A programmatic Water Quality Management Plan (WQMP) has also been <br />prepared for the Project. It outlines the Best Management Practices (BMPs) <br />that will limit stormwater runoff pollution to the maximum extent practicable <br />per the Orange County Technical Guidance Manual. Low Impact Development <br />(LID) BMPs will be utilized on -site, including stormwater infiltration where <br />feasible and biofiltration where infiltration is infeasible. Since the existing <br />developed site does not include and stormwater BMPs currently, the Project will <br />improve stormwater through its use of BMPs. <br />Threshold (g) Would the project place housing within a 100-year flood hazard area as mapped <br />on a federal Flood Hazard Boundary or Flood Insurance Rate Map or other flood <br />hazard delineation map? (CEQA Environmental Checklist: Hydrology and Water <br />Quality) <br />Page 10 of 14 <br />