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CONCLUSIONS AND RECOMMENDATIONS <br />In summary, the soil conditions examined near 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 8.9 min/in was observed at the test location. The <br />soils in the test location were found to be sandy silt and sandy clay. <br />The depth of ground water based on recent aquifer levels is approximately 137 to 158 <br />feet below ground surface. The ground-water flow is to the north or southeast, <br />depending on the season; the rate 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 3.4 mg/L-N, well <br />below the MCL of 10 mg/L-N. DBCP was detected in the sample at a concentration of <br />0.02 kg/L, well below the MCL of 0.2 [J. g/L but above the MCLG of zero. <br />Based on the methods and assumptions described, the nitrate loading calculation <br />indicates that the use of existing and proposed septic tanks and drain field systems on <br />the Site has the potential to cause a buildup of nitrate in the aquifer up to 4.1 mg/L-N, <br />well below the 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 2219 Page 13