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BENDER READY-MIX CONCRETE MANUFACTURING PROJECT , Initial Study/Mitigated Negative Declaration (9) - The proposed project would result in a beneficial impact in regards to water quality during long-term , project operations. The Water Quality Management Plan (WQMP) prepared for the proposed project includes water quality features that would further minimize the potential for violation of water quality , standards. The site (which is currently void of water quality enhancements) is proposed to include a detention/desilting basin in the southeastern portion of the site. This basin would be approximately 400 square feet in size and would improve water quality by detaining stormwater on-site. In addition, three , segments of 24-inch bottomless trench (with 4-inch perforated overflow pipe) would be installed along the South Santa Fe Street frontage.' The segments would be installed across the three vehicle access points, and would drain into landscaped areas or the proposed detention/desilting basin. These Best ' Management Practices (BMPs) would lessen potential long-term operational water quality impacts to a less than significant level. Moreover, the percent of pervious area on-site would increase as part of the proposed project, due to the addition of landscaping and water quality features. Pervious area would increase from 19 percent (pre-project) to 23 percent (post-project), resulting in additional infiltration and , further reduction of potential water quality impacts? In addition, water quality measures being implemented as part of concrete manufacturing operations ' would continue to occur. For instance, tire washing is required for every concrete truck prior to leaving the site to ensure that "track-out" does not occur. In addition, wash water utilized on-site is recycled in order to preclude water quality impacts to the storm drain. Thus, impacts in this regard will be less than significant. ' Mltioation Measures: Refer to Mitigation Measure GEO-2. No additional mitigation is required. ' 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 t bl l l a e eve (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)? Less Than Significant Impact The proposed project site exists within a completely developed, ' industrialized area. The facility does not currently directly affect groundwater (through pumping, wells, or injection), nor does the proposed project include any components that would directly affect groundwater. Given the developed nature of the project area, the facility is not currently depleting , groundwater supplies or substantially interfering with groundwater recharge. The proposed project would result in a beneficial impact in relation to the local groundwater table, since ' it would result in an increase in pervious area on-site. According to the Preliminary WQMP, the total pervious area at the project site would increase from 0.19 acre to 0.21 acre due to the addition of additional landscaping and water quality features.3 Thus, impacts in this regard would be less than , significant. Mitigation Measures: No mitigation is required. 1 CalCoast Engineering & Design Group, Water Quality Management Plan for Bender Ready-Mix, revised May 30, 2010. 2 Ibid. , 3 Ibid. JULY 2011 4.9-2 HYDROLOGY AND WATER QUALITY ' 31A-66