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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. Satisfactory soil percolation rates of 35.7 min/in (shallow) <br /> and 3.5 min/in (deep) were observed. <br /> The depth of ground water based on recent aquifer levels is approximately 74 to 90 feet <br /> below the ground surface, depending on the season. The ground-water flow direction is <br /> predominantly toward the southeast at a rate of approximately 11 to 14 feet per mile in <br /> the vicinity of the Site. <br /> No water sample was collected as part of this investigation. It is anticipated that a well <br /> will be drilled in the future to serve the new house. <br /> Because the deep percolation rate encountered falls between 1.0 and 5.0 min/in, the <br /> San Joaquin County Environmental Health Department will require a 20-foot separation <br /> from the bottom of the dispersal system to ground water. Based on the predicted depth <br /> to ground water of 74 to 90 feet, no modifications to standard septic systems should be <br /> required. <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 7.3 mg/L-N. <br /> • This level falls 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 sumps. Based on the satisfactory result of the nitrate loading calculation, no nitrate <br /> mitigation is recommended. <br /> • LOGE 1901 Page 15 <br />