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within an accident potential zone or clear zone. However/ ~he <br />project site located within a FAA Notification Area for John <br />Wayne Airport. According to FAA criteria, obstructions to air <br />navigation could occur if a structure is at least 500 feet high. <br />Additionally, obstructions could occur if structures are 200 <br />feet higher than the ground elevation of the of the runway and <br />within 3 miles of the airport, 300 feet or more at 4 miles~ 400 <br />feet. or higher at 5 miles and 500 feet or higher at 6 miles or <br />more. The project site is approximately 1.5 miles from John <br />Wayne Airport. However, the height of the proposed project would <br />not exceed the FAA height restriction criteria and would not <br />pose a hazard to air navigation or to people working and <br />residing within the project area. <br /> <br />VIII. HYDROLOGY/WATER QUALITY <br /> <br />Violate Region.al Water Quality Control Board water quality <br />standards or waste discharge requirements? <br /> <br />Potentially Significant Unless Mitigation Incorporated <br /> <br />The primary source of potential adverse water quality impacts <br />associated with the operation of the proposed project would be <br />from nuisance flows. Nuisance flows is defined as runoff that <br />occurs during periods that are not usually associated with <br />rainfall, and are most commonly produced from landscaping <br />irrigation, leaking pipes, and water used to wash off surfaces <br />tributary to the street. Since nuisance flows usually originates <br />in the street, they commonly contain many common pollutants <br />found in streets such as oil and grease and sediment. Such <br />impacts could potentially be in conflict with water quality' <br />standards established by the State Regional. Water.Quality <br />Control Board. Additionally, during construction operations <br />surface water runoff could be degraded potentially resulting <br />adverse water quality impacts to downstream receiving waters. <br />As part of the City's NPDES requirements, the proposed project <br />would be required to incorporate Site Design and Treatment <br />Control Best Management Practices into the site plan. <br /> <br />To reduce potential water quality impacts to a level considered <br />less than significant the following mitigation measure shall be <br />implemented. <br /> <br />Mitigation Measures <br /> <br />· Prior to the issuance of grading permits, the project <br /> applicant shall provide proof of coverage under NPDES <br /> <br /> <br />