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Pleasanton Gateway Environmental Checklist f) Wildlands do not exist within or adjacent to the subject site. Therefore, this would be catego- rized as no-impact. 8. HYDROLOGY AND WATER QUALITY Environmental Setting "fhe subject property is vacant and relatively flat. Surrounding properties and uses include Stanley Bou- levard and the Union Pacific Railroad to the north, a variety of commercial/industrial/ service uses to the west, the P.G. & E. substation to the east, and the Temple Beth Emek Synagogue to the south. At its closest point, the Arroyo Del Valle is approximately 200 feet from its northernmost bank to the site. The National Pollutant Discharge F,limination System (NPDFS) was established in the Clean Water Act to regulate municipal and industrial discharges to surface waters of the U.S. Non-point sourced diffuse and originate over a wide area rather than from a definable point. Two types of non-point source dis- charges are controlled by the NPDES program; discharges caused by general construction activities and general quality of storm water in municipal stormwater systems. Standards of Significance For purposes of this environmental document, an impact is considered significant if the proposed project would: • Result in substantially degrading water quality or violate any water quality objectives set by the State Water Resources Control Board due to increased sediments or other contaminants gener- ated by consumption and/or operation activities; • Result in exposing people or property to the risk of injury and damage in the event of a 100-year flood. Less "than Potentially Significa~u Less "than Significant Wilh Mitigation Significant No Issues Impact Incorporated Impact Impact Hydrology and Water Quality Would the project: a) Violate any water quality standards or waste discharge ^ ^ ^X ^ requirements? 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 (e.g., the production rate of pre-existing nearby wells would drop to a level which would not support existing land uses or planned uses for which permits have been granted)? Pleasanton Gateway Initial Study Page 24 of 37 November 8, 2006