Laserfiche WebLink
• CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the shallow soil conditions examined near the proposed septic system <br /> drain field appear to be suitable. A satisfactory soil percolation rate of 20.8 minutes per <br /> inch was observed for the shallow percolation test. <br /> The depth of ground water based on recent aquifer levels is approximately 84 to 101 <br /> feet below the ground surface, depending on the season. The ground-water flow <br /> direction is toward the north or northeast at a rate of approximately four to seven feet <br /> 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 0.7 mg/L-N in the water sample. DBCP was not detected in the <br /> sample. The US EPA has set the Maximum Contaminant Level (MCL) for nitrate at 10 <br /> mg/L-N and the MCL for DBCP at 0.2 ppb (equivalent to µg/L). <br /> Based on nitrate loading analysis of the existing facilities and proposed project, the use <br /> of on-site septic tanks and drain field systems on the Site have the potential to cause a <br /> buildup of nitrate in the aquifer above the US EPA drinking water recommendation of 10 <br /> mg/L-N. <br /> We believe the Site suitable for the use of septic systems utilizing leach lines and <br /> • seepage pits. Based on the results of the nitrate loading calculation, nitrate mitigation is /f 2 <br /> recommended; the use of engineered or modified septic systems designed to reduce <br /> nitrate levels in the effluent is recommended. <br /> • LOGE 1711 Page 18 <br />