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CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions examined near the proposed septic system drain field <br /> were found to be suitable for standard septic systems utilizing leach lines and seepage <br /> pits. <br /> A satisfactory soil percolation rate of 2.4 min/in was observed in the deep soil zone at <br /> the test location. The soils in the test location were observed to be a mixture of silts, <br /> clays, and sands. The percolation test is considered applicable to an approximate 100- <br /> foot radius of the test location. <br /> Because of the percolation rate between 1.0 and 5.0 min/in encountered in the deep <br /> test hole, the San Joaquin County Environmental Health Department will require a 20- <br /> foot 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 /> Utilizing 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 7.4 mg/L, below the MCL of 10 <br /> mg/L-N. Because of the favorable result of the nitrate loading study, no nitrate <br /> mitigation is recommended. <br /> LOGE 2119 Page 11 <br />