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from this source. According to an analysis of these maps (Plates 5 and 6), ground <br /> water elevation is 58 to 62 feet above mean sea level; ground water flows down to the <br /> northeast at a rate of 4.4 to 6.7 feet per mile in the vicinity of the Site. <br /> Given that the ground elevation of the Site is approximately 88 to 97 feet, the depth to <br /> water below the Site is estimated to range between 27 to 35 feet, depending on the time <br /> of year. <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 /> On-Site Wells <br /> No wells are located on the Site. One 2003 permit for pump replacement at a domestic <br /> well at the Site address was identified at the San Joaquin County Environmental Health <br /> Department. Mr. Robertson indicated, however, that there are no wells on the Site; this <br /> permit may refer to an adjacent property. It has been included in Appendix 4. <br /> lWater Sample \ <br /> �No w <br /> efts are located on the Site. AJo water sample was collected for this study. D <br /> Soil Pro i e and Geologic Information <br /> The Site is depicted on the Preliminary maps showing Quaternary geology of the Tracy <br /> and Midway 7.5-minute quadrangles, California (Sowers and others, 1993). The Site is <br /> depicted within map units of Holocene fan and terrace deposits of Corral Hollow Creek <br /> and levee deposits of Corral Hollow Creek. Both units are described as "unconsolidated <br /> silts, clays, sands, and gravels derived from the Coast Ranges" (Plate 7). Only a <br /> portion of the Site is included on this map; the remainder of the Site is likely to have <br /> similar geology. <br /> The surface and near surface soils located at the Site are reported by the USDA Web <br /> Soil Survey to be composed of Capay clay, 0 to 2 percent slopes, Capay clay, wet, 0 to <br /> 2 percent slopes, and Stomar clay loam, 0 to 2 percent slopes (Plate 8) (USDA, 2009). <br /> The table below presents some selected properties of these soils: <br /> LOGE1008 Page 3 <br />