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CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions examined near the existing and proposed septic system <br /> drain fields appear to be suitable. Satisfactory soil percolation rates of less than 4.3 <br /> minutes per inch (southern test—existing septic drain field)) and 6.8 minutes per inch <br /> (northern test—proposed septic drain field) were observed. <br /> The depth of ground water based on recent aquifer levels is approximately 70 to 73 feet <br /> below the ground surface, depending on the season. The ground-water flow direction is <br /> to the east at a rate of approximately five to seven feet per mile in the vicinity of the Site. <br /> The on-site domestic water well was tested for nitrate and DBCP. Nitrate was detected <br /> at a concentration of 10.9 mg/L-NO3 (2.4 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 as NO3 at 45 mg/L (10 mg/L-N) and the MCL for DBCP at 0.2 ppb (equivalent <br /> to 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 8.08 mg/L-N. <br /> These levels fall below the US EPA drinking water recommendation of 10 mg/L-N. <br /> We believe the Site suitable for development with the use of standard septic systems. <br /> LOGE 1325 Page 15 <br />