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Responses to <br />Environmental Checklist <br />For CEQA Compliance <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 />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 />N. Tributary to an already impaired water body, as listed on the Clean Water Act Section <br />303(d) list. If so, can it result in an increase in any pollutant of which the body is already <br />impaired? <br />O. Tributary to other environmentally sensitive areas? If so, can it exacerbate already existing <br />sensitive conditions? <br />P. Have a potentially significant environmental impact or surface water quality to either <br />marine, fresh or wetland waters? <br />Q. Have a potentially significant adverse impact on the groundwater quality? <br />R. Cause or contribute to an exceedance of applicable surface or groundwater receiving <br />water quality objectives or degradation of beneficial uses? <br />S. Impact aquatic, wetland or riparian habitat? <br />Less Than Significant With Mitigation Incorporated <br />The City of Santa Ana is included within four watersheds, San Diego Creek, Santa Ana River, Talbert and <br />Westminster. Each of these watershed areas are under the jurisdiction of the Santa Ana Regional Water <br />Quality Control Board and subject to the objectives, water quality standards and Best Management <br />Practice requirements established in the Santa Ana River Basin Plan and Orange County Drainage Area <br />Management Plan. The City of Santa Ana implements the goals, objectives and requirements of the <br />Basin Plan and Drainage Area Management Plan through the City's Local Implementation Plan. <br />Storm water flows from the project site would be conveyed to an underground storm drain before <br />ultimately discharging into Santa Ana River watershed. The Santa Ana Regional Water Quality Control <br />Board has identified Santa Ana River as impaired by nutrients, sediments, metals and pesticides. <br />The primary source of potential adverse water quality impacts associated with the construction and <br />operation of the proposed project would be from nuisance flows. Nuisance flows is defined as runoff that <br />occurs during periods that are not usually associated with rainfall, and are most commonly produced from <br />landscaping irrigation, leaking pipes, and water used to wash off surfaces tributary to the street. Since <br />nuisance flows usually originates in the street, they commonly contain many common pollutants found in <br />streets such as oil and grease and sediment. Additionally, surface water runoff generated from the project <br />site during construction operations could be degraded potentially resulting in adverse water quality impacts <br />to downstream receiving waters. <br />Mitigation Measures <br />~~• ~~ ' ~i <br />