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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 or sumps. A satisfactory soil percolation rate of 20.8 min/in was observed in the <br />shallow soil zone at the test location. The soil in the test location was found to be sandy <br />silt and sandy clay. <br />The depth of ground water based on recent aquifer levels is approximately 113 feet <br />below ground surface. The ground-water flow is to the northwest at a rate of <br />approximately six 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 1.94 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 [1g/L. <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 8.8 mg/L-N, less than the <br />maximum drinking water standard of 10 mg/L-N. No nitrate mitigation is recommended <br />at this time. <br />LOGE 2148 Page 13