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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. A satisfactory soil percolation rate of 5.1 min/in was observed in the shallow soil <br />zone at the test location. The soil in the test location was found to be clay and sandy <br />clay. <br />The depth of ground water based on recent aquifer levels is approximately 114 to 117 <br />feet below ground surface. The ground -water flow is to the northeast at a rate of <br />approximately 8 to 12 feet per mile. <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 3.6 mg/L-N, <br />below the MCL of 10 mg/L-N. DBCP was not detected in the sample; the MCL for <br />DBCP is 0.2 [g/L. Based on maps reviewed, neither nitrate nor DBCP appear to be a <br />common problem in the area. <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 9.4 mg/L, less than the <br />maximum drinking water standard of 10 mg/L-N. No nitrate mitigation is warranted at <br />this time. <br />LOGE 2144 Page 13 <br />