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• CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions examined near the proposed septic system drain field <br /> appear to be suitable. A satisfactory soil percolation rate of 10 minutes per inch was <br /> observed. <br /> The depth of ground water based on recent aquifer levels is approximately 97 to 110 <br /> feet below the ground surface, depending on the season. The ground-water flow <br /> direction is predominantly toward the northeast at a rate of approximately three to five <br /> feet per mile in the vicinity of the Site. <br /> The on-site domestic water well was tested for nitrate and DBCP. Nitrate was detected <br /> at a concentration of 0.5 mg/L-N in the water sample, well below the US EPA drinking <br /> water recommendation of 10 mg/L-N. DBCP was not detected in the sample. <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 2.3 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 /> • <br /> • LOGE 1820 Page 14 <br />