Laserfiche WebLink
Ground Water Information <br /> Depth and Gradient <br /> Live Oak reviewed ground water elevation information available from the San Joaquin <br /> County Flood Control and Water Conservation District to determine the ground water <br /> levels near the Site. Data from the fall of 2017 and the spring of 2018 were the most <br /> recent available from this source. The Site is beyond the mapped area for both years <br /> (Plates 4 and 5). However, by extrapolation it can be estimated that the ground water <br /> elevation is approximately zero to 10 feet below mean sea level. The ground-water flow <br /> direction could not be determined. Ground-water depth and flow in the Delta are highly <br /> dependent on nearby island pumping activities and, as a result, subject to fluctuation. <br /> On February 28, 2021, Live Oak excavated a boring adjacent to the percolation test <br /> hole for the purpose of determining the depth to water. Ground water was encountered <br /> in the boring at 7.5 feet below ground surface on February 28, and at 6.3 feet below <br /> ground surface on March 1. The difference in water levels encountered may be a <br /> result of equalization of the test hole and/or nearby island pumping activities. It is <br /> anticipated that water levels beneath the Site will fluctuate, especially on a seasonal <br /> basis. <br /> Potential Ground Water Contamination Issues <br /> The Soil Suitability Study is not intended to be an investigation into ground-water <br /> contamination sources, and no such investigation was conducted. Many sources can <br /> contribute to ground-water contamination, including leaking underground storage tanks, <br /> agricultural activities, dairies, septic systems, and storm water infiltration. Agricultural <br /> activities and the use of septic systems in the area are known ground-water <br /> contamination sources with the potential to impact the Site. <br /> Two common ground-water contaminants in San Joaquin County are nitrate and <br /> dibromochloropropane (DBCP). Live Oak reviewed the San Joaquin County <br /> Environmental Health Department's maps of Nitrate — Land Use Data and DBCP— Land <br /> Use Data dated February 20, 2019. According to these maps, no wells in the vicinity of <br /> the Site have been tested for either constituent. <br /> On-Site Wells <br /> A domestic well is located on the Site (Plate 2). No well permits were identified for the <br /> Site from among the files of the San Joaquin County Environmental Health Department. <br /> LOGE 2110 Page 3 <br />