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from water purchases, with only 16 percent coming from its own groundwater wells. Annual groundwater usage in the Cal Water Stockton District from 2016 to 2020 has varied from 924 acre-feet to 4,681 acre-feet(Cal Water 2021). The Cal Water 2020 Urban Water Management Plan analyzed the availability of water supply for the Stockton District, based on historical surface water and groundwater use and review of available information regarding future supply availability, including the impacts of the Sustainable Groundwater Management Act. To develop its demand projections, Cal Water used the Stockton General Plan 2040 land use map, which designates the project site for low-density residential use. Based on the available information, the available groundwater supply and the purchased water supply are expected to be sufficient to meet the projected future demands of Cal Water's service area in normal and multiple dry year periods through 2045 (Cal Water 2021). No additional supplies would be required. As the project is consistent with the land use assumption used in preparation of the Cal Water 2020 Urban Water Management Plan, its impact on groundwater supply is considered less than significant. The project site currently consists of vacant land. Project development, with its additional impervious surfaces, would eliminate most of the vacant land, which serves as a recharge area for local aquifers. However, the project would be required to comply with the provisions of the SWQCCP that include the implementation of Volume Reduction Measures and Low Impact Development Treatment Controls, such as vegetated buffer strips, infiltration basins, porous pavement, and grassy swales, among others. A registered professional engineer shall design the site to comply with the volume reduction requirement outlined in the County's 2021 SWQCCP. Implementation of measures like these would allow for greater percolation and maintenance of recharge of local aquifers. Project impacts on groundwater supplies and recharge would be less than significant. c-i, ii) Drainage Patterns. Drainage patterns on the project site are limited, as most precipitation on the site percolates into the ground, with some runoff entering Duck Creek and Bieghle Drain. As noted in b) above, project development would involve additional impervious surfaces, which would alter existing drainage patterns. However, as described in Chapter 2.0, Project Description, drainage on the project site would be collected and disposed of in accordance with the MS4 permit and/or County standards, depending on the alternative selected. This would ensure that drainage after project completion would not result in siltation or flooding, either onsite or offsite. Project impacts on drainage patterns would be less than significant. c-iii) Runoff. The project would result in increased runoff being generated on the project site, as impervious surfaces would be added. However, as noted in a) above, runoff would be collected by storm drainage facilities. In accordance with San Joaquin County Code Chapter 9-1135, where a development project will cause an increase in the storm water runoff release rate, the developer shall provide drainage facilities to prevent the increased runoff release rate of storm water from discharging onto other properties. As a condition Pock Lane Public Review Draft IS/MND 3-47 May 2022