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CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions examined near the proposed septic system drain fields <br /> were found to be suitable for standard septic systems. A satisfactory soil percolation <br /> rate of 3.79 min/in was observed in the deep soil zone at the test location. The soil in <br /> the test location was found to be clay, sandy clay, and silty sand. <br /> The depth of ground water based on recent aquifer levels is approximately 82 to 85 feet <br /> below ground surface. The ground-water flow is to the east or southeast at a rate of <br /> four to seven feet per mile. <br /> Because of the percolation rate between 1.0 and 5.0 min/in encountered in the test <br /> hole, the San Joaquin County Environmental Health Department will require a 20-foot <br /> separation from the bottom of the dispersal system to ground water. Based on the <br /> anticipated depth to ground water, no modifications to standard septic systems should <br /> be required. <br /> Mr. Jaimes provided Live Oak with the results of water sampling at the domestic well <br /> conducted by the San Joaquin County Environmental Health Department on November <br /> 3, 2020. Nitrate was detected in the sample at a concentration of 1.5 mg/L-N. DBCP <br /> was not detected in the water sample. <br /> Based on the methods and assumptions described, the nitrate loading calculation <br /> indicates that the use of on-site septic tanks and drain field systems on the Site has the <br /> potential to cause a buildup of nitrate in the aquifer up to 9.6 mg/L-N, below the MCL of <br /> 10 mg/L-N. Because of the favorable result of the nitrate loading calculation, no nitrate <br /> mitigation is recommended. <br /> LOGE 20-63 Page 15 <br />