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CONCLUSIONS AND RECOMMENDATIONS <br />In summary, the soil conditions examined at the Site were found to be suitable for <br />standard septic systems utilizing leach lines with seepage pits. No construction is <br />anticipated. <br />Satisfactory soil percolation rates of 22.7 min/in (Parcel A, shallow), 3.8 min/in (Parcel <br />A, deep), 4.8 min/in (Parcel B, deep), 35.7 min/in (Parcel C, shallow), and 4.4 min/in <br />(Parcel D, shallow) were observed at the test locations. The soils in the test locations <br />were found to be silts, clays, and sands. <br />The depth of ground water based on recent aquifer levels is approximately 110 to 118 <br />feet below ground surface. The ground-water flow is to the north or northeast at a rate <br />of approximately seven feet per mile in the vicinity of the Site. <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 6.0 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 future on-site septic tanks and drain field systems on the Site <br />has the potential to cause a buildup of nitrate in the aquifer up to 0.6 mg/L-N, well below <br />the maximum drinking water standard of 10 mg/L-N. Because of the favorable result of <br />the nitrate loading calculation, no nitrate mitigation is recommended at this time. <br />LOGE 2062 Page 17