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City of Santa Ana Environmental Checklist imported from Northern California and the Colorado River by the Metropolitan Water District of Southern California (Metropolitan). Water recharge in Orange County occurs from the Santa Ana River, recycled water, and imported water. The OCWD recharge basins are located solely in the cities of Anaheim and Orange (OCWD 2012). The OCWD maintains 30 recharge facilities with a combined total storage volume of about 26,000 acre-feet and 1,067 acres of wetted areas, none of which are located near the proposed project site (OCWD 2009). The project site is currently covered with 60% impervious surfaces. Any storm flows on site drain to the street, and the site is not a source for groundwater recharge. The project would redevelop the site and increase impervious surfaces to 91.7%. However, because the site does not contain recharge facilities, the project would not interfere with groundwater recharge. The projected water demand associated with the proposed project is estimated at approximately 3,056 gallons per day. This volume of water use by the proposed project will not result in substantial depletion of water resources from the Orange County Groundwater Basin (see Utilities and Service Systems for an expanded discussion on water). Therefore, although the proposed project would involve dewatering activities, it world not result in the substantial depletion of groundwater supplies or substantially interfere with groundwater recharge such that there would be net deficit in aquifer volume or lowering of the groundwater table. Impacts related to lowering the groundwater table and groundwater recharge are less than significant. 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 that would result in substantial erosion or siltation on site or off site? Less-than-Significant Impact with Mitigation Incorporated. The proposed project would result in an increase in the amount of impervious surfaces on site by approximately 20,160 square feet. To capture and retain stonmwater on site, the project includes grassy swales and an onsite stormwater drainage system that will control flows, and not substantially alter the existing drainage pattern of the project site. The swales are designed to accommodate the site drainage and will have a two-foot bottom width and a 3:1 side slope within a four-foot-wide area adjacent to the project perimeter wall. In addition to the swales, runoff that is captured by the driveway ramps or parking garage will be intercepted by drain inlets and pumped into the sanitary sewer. This onsite infrastructure would not result in any increase in offsite project flows, and would not result in alteration of the existing drainage pattern. Further, implementation of the grassy swales would reduce offsite erosion or siltation. Thus, impacts on offsite drainage and erosion during project operations would be less than significant. The project site is not within the vicinity of a stream or river that would be affected by the proposed project. Current drainage patterns consist of surface flow across the site and into the curb/gutter along Sullivan Street, which directs stormwater into a regional drain on McFadden Avenue to the southeast of the project site. As a result, the project would not change the existing offsite drainage patterns or alter the course of a stream or river. As discussed above under IX.a, Mitigation Measure HYD-1 would ensure that an NPDES General Construction permit and an SWPPP would be obtained to address sediment control and flooding during construction activities. As a result of compliance with existing regional and local regulations, impacts are related to changes in the drainage pattern of, erosion/siltation from the site and are less than significant with incorporation of Mitigation Measure HYD-1. The Bat Nha Buddhist Meditation Center 3-55 June 2013 Initial Study/Mitigated Negative Declaration ICF 00215.12 31 C-108