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CONCLUSIONS AND RECOMMENDATIONS <br />In summary, the soil conditions examined at the proposed septic disposal field of the <br />Site were found to be suitable for a standard septic system utilizing leach lines with <br />seepage pits. <br />A satisfactory soil percolation rate of 16.7 min/in was observed at the test location. The <br />soil in the test location was found to be sandy silt. <br />The depth of ground water based on recent aquifer levels is approximately 137 to 160 <br />feet below ground surface. The ground -water flow is to the north or southeast; the rate <br />could not be calculated. <br />A water sample was collected from the domestic well on the Site as part of this <br />investigation. Nitrate was detected in the sample at a concentration of 3.0 mg/L-N, well <br />below the MCL of 10 mg/L-N. DBCP was not detected in the sample. <br />Based on the methods and assumptions described, the nitrate loading calculation <br />indicates that the use of existing septic tanks and drain field systems on the Site has the <br />potential to cause a buildup of nitrate in the aquifer up to 4.4 mg/L-N, well below the <br />maximum drinking water standard of 10 mg/L-N. <br />Because of the favorable result of the nitrate loading calculation, no nitrate mitigation is <br />recommended at this time. <br />LOGE 2210 Page 13 <br />