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• 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, it appears that most septic systems in the <br /> area utilize leach lines. The septic permits can be found in Appendix 4 of this report. <br /> Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected septic usage on the Site would be from the three existing homes, as <br /> well as a potential second unit dwelling on the larger parcel. No residential construction <br /> is planned. <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 spring and fall of 2016 were the most recent <br /> available from this source (Plates 6 and 7). The Site is outside the indicated ground- <br /> water contours on these maps. <br /> • On January 10, 2018, Live Oak excavated a soil boring to ten feet below ground surface <br /> near percolation test boring P2. No ground water was encountered. A few days later, <br /> Live Oak measured the depth to water within the domestic well; water was encountered <br /> at 17.4 feet below ground surface. <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 and cattle ranches, septic systems, and storm water <br /> infiltration. Agricultural activities and the use of septic systems in the area are known <br /> ground-water contamination sources with the potential to impact the Site. <br /> Live Oak reviewed the San Joaquin County Environmental Health Department's Water <br /> Well Data Table dated March 10, 2009 for nearby addresses that have been tested for <br /> nitrate and dibromochloropropane (DBCP). Two wells were identified at addresses <br /> within approximately 1.5 miles of the subject Site. Both wells had been tested for nitrate <br /> and DBCP. DBCP was not detected in either well; nitrate was detected in one at a <br /> concentration of 4 mg/L. The Maximum Contaminant Level (MCL) set by the US EPA <br /> for nitrate as NO3 is 45 mg/L. The MCL for DBCP is 0.2 µg/L. <br /> • <br /> LOGE 1801 Page 3 <br />