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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 25 minutes per inch was <br /> observed. <br /> The depth of ground water based on recent aquifer levels is approximately 102 to 122 <br /> feet below the ground surface, depending on the season. The ground-water flow <br /> direction is toward the northeast at a rate of approximately five to 13 feet per mile in the <br /> vicinity of the Site. <br /> The onsite domestic water well was tested for nitrate and DBCP. Nitrate was detected <br /> at a concentration of 4.2 mg/L-NO3 (0.93 mg/L-N) in the water sample. DBCP was not <br /> detected in the sample. The US EPA has set the Maximum Contaminant Level (MCL) <br /> for nitrate at 45 mg/L-NO3 (10 mg/L-N) and the MCL for DBCP at 0.2 ppb (equivalent to <br /> ug/L). <br /> Based on the current project, the use of on-site septic tanks and drain field systems on <br /> the Site is not expected to cause a buildup of nitrate in the aquifer above 3.1 mg/L-N. <br /> This level falls below the US EPA drinking water recommendation of 10 mg/L-N. In fact, <br /> the actual impact to the aquifer will be much less since the nitrate loading equation is <br /> conservative and overestimates impacts. <br /> We believe the Site suitable for the use of standard septic systems utilizing leach lines <br /> and seepage pits. Based on the satisfactory result of the nitrate loading calculation, no <br /> nitrate mitigation is recommended. <br /> LOGE 1729 Page 14 <br />