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periods that are not usually associated with rainfall, and are <br />most commonly produced from landscaping irrigation, leaking <br />pipes, and water used to wash off surfaces tributary to the <br />street. Since urban runoff originates in the street, they <br />commonly contain many common pollutants found in streets such as <br />oil and grease and sediment. Additionally, adverse water quality <br />impacts could occur from rain events when sediment, grease and <br />oil on roadways and parking lots are flushed into the local <br />storm drain system. Currently, the project site does not contain <br />any structural Best Management Practices, which could <br />potentially decrease the amounts of pollutants from entering the <br />storm drain system. Uncontrolled urban runoff generated from the <br />project site could result in adverse water quality impacts to <br />downstream receiving waters. <br />The proposed project has proposed a preliminary water quality <br />management plan to manage storm water flows generated from the <br />project site. The water quality management plan proposes a <br />filter in the parking lot catch basin to collect runoff, trash, <br />debris, sediment and grease and oil. Additionally, the proposed <br />project includes a series of Routine Structural and Routine Non- <br />structural Best Management Practices to minimize water quality <br />impacts. <br />To reduce potential short-term construction related water <br />quality impacts and long-term operational water quality impacts <br />to a level that would be less than significant, the following <br />mitigation measures shall be implemented. <br />Mitigation Measures <br />• Prior to the issuance of grading permits, the project <br />applicant shall provide proof of coverage under NPDES <br />General Industrial Activity Storm Water Permit, which <br />includes a copy of the project permit number issued by the <br />State Water resource Control Board. <br />• Prior to the issuance of gradi8ng permits the project <br />developer shall submit for review and approval a surface <br />drainage/grading/erosion control plan, prepared by a <br />registered Civil Engineer, showing the direction and means <br />of flow to the adjacent street. The plan is to include <br />existing and proposed elevations at and adjacent to all <br />property lines. Drainage routed to the street must be <br />directed beneath the sidewalk and through the curb. <br />18 32~,~2 <br />