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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 for a standard septic system utilizing leach lines with seepage <br /> pits. Satisfactory soil percolation rates of 31.25 min/in (shallow) and 7.58 min/in (deep) <br /> were observed at the test location. The soils in the test location were found to be clay, <br /> sandy clay, and sandy silt. <br /> The depth of ground water based on recent aquifer levels is approximately 40 to 42 feet <br /> below ground surface. The ground-water flow is to the northeast at a rate of <br /> approximately 5 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 4.9 mg/L-N, well <br /> below the MCL of 10 mg/L-N. DBCP was not detected in the sample; the MCL for <br /> DBCP is 0.2 ug/L. Based on maps reviewed, neither nitrate nor DBCP appears to be a <br /> problem in nearby wells. <br /> Based on the methods and assumptions described, the nitrate loading calculation <br /> indicates that the use of on-site septic tanks and drain field systems on the Site has the <br /> potential to cause a buildup of nitrate in the aquifer up to 8.5 mg/L, below the maximum <br /> drinking water standard of 10 mg/L-N. Because of the favorable result of the nitrate <br /> loading calculation, no nitrate mitigation is recommended at this time. <br /> LOGE 2104 Page 13 <br />