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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 14.71 min/in was observed at the test <br />location. The soils in the test location were found to be clay and silty sand. <br />The depth of ground water based on recent aquifer levels is approximately 45 to 55 feet <br />below ground surface. The ground -water flow is to the northeast at a rate of <br />approximately 5 to 7 feet per mile in the vicinity of the Site. <br />No active wells are located on the Site; no water sample was collected as part of this <br />investigation. Based on maps reviewed, neither nitrate nor DBCP appears to be a <br />problem in nearby wells. Permit records indicate that an old well may be located on the <br />Site. <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 3.8 mg/L, well below the <br />maximum drinking water standard of 10 mg/L-N. Because of the favorable result of the <br />nitrate loading calculation, no nitrate mitigation is recommended at this time. <br />LOGE 2201 Page 14 <br />