Laserfiche WebLink
CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions examined near the proposed septic system drain field <br /> were found to be suitable for a standard septic system utilizing leach lines and sumps or <br /> seepage pits. <br /> A satisfactory soil percolation rate of 50.0 min/in was observed in the test location. The <br /> shallow soil in the test location was found to be clay. <br /> The depth of ground water based on recent aquifer levels is approximately 85 to 90 feet <br /> below ground surface. The ground-water flow is to the east at a rate of approximately 8 <br /> to 13 feet per mile in the vicinity of the Site. <br /> A water sample was collected from the domestic well on the Site as part of this <br /> investigation. Nitrate was detected in the sample at a concentration of 2.0 mg/L-N, well <br /> below the MCL of 10 mg/L-N. DBCP was not detected in the sample; the MCL for <br /> DBCP is 0.2 ug/L. Based on regional maps of nitrate and DBCP detections reviewed, <br /> neither constituent appears to be a significant problem for wells in the area. <br /> Based on the methods and assumptions described, the nitrate loading calculation <br /> indicates that the use of on-site septic tanks and drain field systems on the Site has the <br /> potential to cause a buildup of nitrate in the aquifer up to 6.7 mg/L, below the maximum <br /> drinking water standard. As a result, no nitrate mitigation is recommended for the new <br /> septic system. <br /> LOGE 20-49 Page 13 <br />