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CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions examined near the location of the septic system drain <br /> field appear to be suitable. A satisfactory soil percolation rate of less than 1.5 minutes <br /> per inch was observed. <br /> The depth of ground water based on recent aquifer levels is deep, approximately 164 to <br /> 204 feet below the ground surface, depending on the season and location on the Site. <br /> The ground-water flow direction is to the southwest at a rate of approximately five to six <br /> feet per mile in the vicinity of the Site. <br /> The on-site domestic water well was tested for nitrate and DBCP. Neither constituent <br /> was detected in the water sample. The US EPA has set the Maximum Contaminant <br /> Level (MCL) for nitrate as NO3 at 45 mg/L and the MCL for DBCP at 0.2 ppb (equivalent <br /> to �tgIL). <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 1.83 mg/L-N. <br /> This level falls well below the US EPA drinking water recommendation of 10 mg/L-N. In <br /> fact, the actual impact to the aquifer will most likely be less since the nitrate loading <br /> equation is conservative and overestimates impacts. <br /> We believe the Site suitable for development with the use of standard septic systems. <br /> We do not anticipate that the ground water quality will be negatively impacted, and no <br /> nitrate mitigation is recommended. <br /> LOGE 1402 Page 15 <br />