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<br />Orange County Drainage Area Management Plan. The City of Santa <br />Ana implements the goals, obj ecti ves and requirements of the <br />Basin Plan and Drainage Area Management Plan through the City's <br />Local Implementation Plan. <br /> <br />Storm water flows from the project site would be conveyed to an <br />underground storm drain and Lane Channel before ultimately <br />discharging into Reach 1 of San Diego Creek. The Santa Ana <br />Regional Water Quality Control Board has identified San Diego <br />Creek as impaired by nutrients, sediments, metals and <br />pesticides. <br /> <br />The primary source of potential adverse water quality impacts <br />associated with the construction and operation of the proposed <br />project would be from nuisance flows. Nuisance flows is defined <br />as runoff that occurs during periods that are not usually <br />associated with rainfall, and are most commonly produced from <br />landscaping irrigation, leaking pipes, and water used to wash <br />off surfaces tributary to the street. Since nuisance flows <br />usually originates in the street, they commonly contain many <br />common pollutants found in streets such as oil and grease and <br />sediment. Additionally, surface water runoff generated from the <br />proj ect site during construction operations could be degraded <br />potentially resulting in adverse water quality impacts to <br />downstream receiving waters. <br /> <br />Additionally, the proposed project includes food preparation <br />uses. Commercial kitchens could potentially produce grease as a <br />by-product of their operation. If not properly disposed of, the <br />grease could potentially create blockage of sewer lines, which <br />could result in damages to both public and private property and <br />potentially resulting in adverse water quality impacts. <br /> <br />The long-term operation and short-term construction activities <br />associated with the proposed proj ect could potentially result <br />adverse water quality impacts that could be in conflict with <br />water quality standards established by the State Regional Water <br />Quality Control Board. To reduce potential water quality impacts <br />to a level considered less than significant the following <br />mitigation measure shall be implemented. <br /> <br />Mitigation Measures <br /> <br />· Prior to issuance of grading permits, the project developer <br />shall provide proof of coverage under NPDES General <br />Construction Activity Storm Water Permit that includes; (a) <br />A copy of the proj ect' s permit issued by the State Water <br />Resource Control Board that identifies the permit number, <br />(B) Two copies of the Storm Water Pollution Prevention <br />Plan. <br /> <br />17 <br /> <br />7 5At4 7 <br />