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• CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions examined near the proposed septic system drain field <br /> appear to be suitable. A satisfactory soil percolation rate of 6.25 min/in was observed <br /> at the test location. <br /> The depth of ground water based on recent aquifer levels is approximately 30 to 43 feet <br /> below the ground surface. The ground-water flow direction is to the northeast at a rate <br /> of approximately six feet per mile in the vicinity of the Site. <br /> No wells are located on the Site; no water sample was collected. <br /> Based on the current project, the use of an on-site septic tank and drain field system on <br /> the Site has the potential to cause a buildup of nitrate in the aquifer up to 21.01 mg/L-N. <br /> This level exceeds the US EPA drinking water recommendation of 10 mg/L-N. <br /> It is recommended that an engineered septic system with the ability to reduce nitrate <br /> levels in the effluent be installed at the proposed fourplex. Based on the Hantzsche and <br /> Finnemore equation, the average nitrate as N concentration of the post-treatment septic <br /> effluent should not exceed 16.5 mg/L to maintain long-term nitrate levels in the aquifer <br /> below 10 mg/L-N. <br /> • <br /> • LOGE 1623 Page 12 <br />