31A - 100 W. MACARTHUR BLVD. - Laserfiche WebLink

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Additionally, nuisance is another source of potential water quality impacts. Nuisance flows are defined as runoff that occurs during periods that are not usually associated with rainfall, and are most commonly produced from landscaping irrigation, leaking pipes, and water used to wash off surfaces tributary to the street. Since nuisance flows usually originates in the street, they commonly contain many common pollutants found in streets such as oil/grease, metals and sediment. Because the proposed project includes a service station use there is a higher potential for water quality impacts associated with substances such as oil and grease. The service station contains an existing clarifier, which retains oil and greases from entering into the local storm water system. Therefore, long-term water quality impacts from the operation of the proposed project would be less than significant. During construction operations there is the potential that surface water runoff could be degraded, if conveyed into the local storm drain system, potential adverse water quality impacts could occur to downstream receiving waters. To minimize potential construction related water quality impacts, the proposed proj ect would be required to employ Best Management Practices during construction. Mitigation Measure · Building plans for the proposed proj ect shall reflect that a sand/grease interceptor is provided within the proposed car wash area. · Building plans for the proposed project shall identify Best Management Practices that shall be employed during construction operations to minimize water quality impacts. B. Substantially deplete groundwater supplies or interfere substantially with groundwater recharge such that there would be a net deficit in aquifer volume or a lowering of the local groundwater table level. Q. Have a potentially significant adverse impact on groundwater quality? No Impact 16 31A8~ 7