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1 I~ I~ significant and measures will have to be implemented to mitigate said impacts. The primary water quality concern associated with the operation of the project site is urban runoff during the daily operation of the complex. Adherence to BMPs as part of a Water Quality Management Plan (WQMP) during the operation of the project site will reduce the impact of urban water runoff. The construction phase also has the potential to impact water quality through surface water runoff. Since the project site is greater than one acre, a National Pollution Discharge Elimination System (NPDES) permit for construction activities must be obtained from the State Regional Water Quality Control Board (RWQCB). This permit requires the development and implementation of a SWPPP, which identifies BMPs that will protect stormwater runoff during the construction phase. Potential impacts would be less than significant with the implementation of Mitigation Measures WQ-1 and WQ-2. Mitigation Measures WQ-1 As part of the design of the proposed project, a WQMP will be prepared and implemented. The WQMP will include structural and nonstructural BMPs, which will avoid or minimize, to the greatest extent possible, the water quality impacts associated with the daily operation of the project site. WQ-2 The proposed project will require a NPDES permit and will require the preparation of a SWPPP incorporating BMPs to reduce stormwater impacts during construction. 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)? Less Than Significant Impact. As of 2005, the City of Santa Ana owns and operates 19 wells that range in depth from 650 to 1,500 feet, eight reservoirs with a total capacity of 49.3 million gallons, and seven import connections to the Metropolitan Water District (MWD). Thirty-six percent of the water used in the City comes from wholesale water sourced from MWD. The remaining 64% is pumped from the 19 local wells. Currently, the City in conjunction with the Orange County Water District (OCWD) use natural and artificial recharge strategies to recharge the groundwater in the basin. Artificial recharge includes water injection into groundwater aquifers and the use of percolation ponds. Water injection replenishes the groundwater and additionally, prevents the intrusion of salt water into the groundwater reserves. Furthermore, as mentioned in the Geotechnical Investigation Report, six test borings were drilled to depths ranging from 15 to 50 feet below the existing ground surface to analyze subsurface conditions of the project site. Groundwater was encountered in the test borings at a depth of 9 feet. Temporary and permanent dewatering during construction was recommended in the project's Geotechnical Investigation Report. Given the capacities and the large amount of water injected into the aquifers, it is anticipated 49 Initial Study/Mitigated Negative Declaration July 2008 Hazbor Medical and Retail Center ~ ~ w Q