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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. A satisfactory soil percolation rate of 5.4 minutes per inch <br /> was observed in the test location. <br /> The depth of ground water based on recent, mapped aquifer levels is approximately 200 nj <br /> to 240 feet below the ground surface. The ground water flows toward the northeast or <br /> southeast at a rate of approximately seven to 13 feet per mile in the vicinity of the Site, <br /> depending on the season. S <br /> Because the percolation rate encountered falls between 5.0 and 30 min/in, the San <br /> Joaquin County Environmental Health Department will require an eight-foot separation <br /> from the bottom of the dispersal system to ground water. Based on the predicted depth <br /> to ground water of 200 to 240 feet, no modifications to standard septic systems should <br /> be required. <br /> No operational wells are located on the Site; no water sample was collected. <br /> Based on the current project, the use of on-site septic tanks and drain field systems on <br /> the Site is not expected to cause a buildup of nitrate in the aquifer above 0.6 mg/L-N. <br /> This level falls well below the US EPA drinking water recommendation of 10 mg/L-N. <br /> We believe the Site suitable for the use of standard septic systems utilizing leach lines <br /> and seepage pits. Based on the satisfactory result of the nitrate loading calculation, no <br /> nitrate mitigation is recommended. <br /> LOGE 1849 Page 14 <br />