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that the proposed project is not anticipated to substantially deplete groundwater supplies or interfere with groundwater recharge. ' C. Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, in a manner which would ' result in substantial erosion or siltation on- or off-site? Less Than Significant Impact. The project site in its current state is composed of an asphalt parking lot and an agricultural field planted in row crops. Stormwater and urban water during the drier months most likely flow from the agricultural field through the parking lot and on to the curb and gutter on Harbor Boulevard. The proposed project would convert the field and parking lot into a commercial ' building and parking lot. As mentioned in the Geotechnical Investigation Report, an adequate drainage system should be provided behind applicable walls to ' prevent the build-up of hydrostatic pressure. Furthermore, by adhering to the requirements of the NPDES and WQMP regulations, and recommendations from the Geotechmcal Investigation Report, the proposed project would not have a ' significant impact on runoff and flooding. Additionally, no streams or rivers pass through the project site. D. Substantially alter the existing drainage pattern of the site or area, including ' through the alteration of the course of a stream or river, or substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or off-site? ' No Impact. The proposed project is not expected to produce significant increases in flooding potential or changes in drainage patterns on or adjacent to the project ' site. Nonetheless, a Hydrologic Analysis Report will be prepared and approved by the City as part of the project design packet submission. A properly designed and implemented City-approved drainage system will mitigate the increase in ' impervious surfaces resulting from the project. No further study is necessary, and no mitigation measures are required. E. Create or contribute runoff water which would exceed the capacity of existing or ' planned Stormwater drainage systems or provide substantial additional sources of polluted runoff? ' Less than Significant Impact with Mitigation Incorporation. The proposed project site development has the potential to increase the amount and the sources of polluted water runoff. Preparing and implementing a WQMP with associated BMPs) as required under Mitigation Measure WQ-1 will mitigate the effects of the proposed project to less than significant levels. Refer to response Hydrology and Water Quality (A.), above. ' F. Otherwise substantially degrade water quality? Less than Significant Impact with Mitigation Incorporation. The project ' construction and the long-term operation of the project site could have potentially significant impacts on regional water quality by increasing water pollutants and sediments. Implementing Mitigation Measures WQ-1 and WQ-2 will lessen the ' impact on water quality to less than significant levels. 50 Initial Study/Mitigated Negative Declazation July 2008 Hazbor Medical and Retail Center 7 5A 8 3