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The area surrounding the Site consists of rural residences, orchards, and open, <br />agricultural land. <br />Septic Permit History in the Vicinity <br />Based on a review of septic permits on file at the San Joaquin County Environmental <br />Health Department for nearby properties, most septic systems in the area utilize leach <br />lines with 25 -foot deep seepage pits. The septic permits can be found in Appendix 4 of <br />this report. <br />Expected On -Site Maximum Septic Tank Usage <br />Maximum expected usage on the Site would be from the current and future residents of <br />the Site. Septic system design should be based on the San Joaquin County On -Site <br />Wastewater Treatment Systems Standards (2017) or other engineering <br />recommendations. <br />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 2018 and the spring of 2019 were the most <br />recent available from this source. According to an analysis of these maps (Plates 4 and <br />5), ground water elevation is approximately 37 to 67 feet below mean sea level. Ground <br />water appears to flow to the northwest or south in the general area, at a rate of <br />approximately five to ten feet per mile, depending on the season. <br />Given that the ground elevation of the Site is approximately 79 feet above mean sea <br />level, the depth to water below the Site is estimated to be approximately 116 to 146 <br />feet. <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 />LOGE 2226 Page 3 <br />