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• CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions in the percolation test locations appear to be suitable for <br /> use with on-site septic systems. Satisfactory soil percolation rates of 1.2 and 1.6 min/in <br /> were observed in the test locations. No new construction is anticipated. <br /> The depth of ground water based on recent aquifer levels is estimated to range between <br /> nine to 17 feet below ground surface. The ground-water flow is to the north or <br /> southwest at a rate of approximately two to five feet per mile, depending on the season. <br /> A water sample was collected from the domestic water well. Nitrate was detected in the <br /> sample at a concentration of 6.6 mg/L-N, well below the MCL of 10 mg/L-N. DBCP was <br /> not detected in the sample. <br /> We believe the Site suitable for the use of septic systems utilizing leach lines or filter <br /> beds. Based on the percolation rates of 1.2 and 1.6 min/in, the San Joaquin County <br /> Environmental Health Department will require either a 20-foot separation from the <br /> bottom of the dispersal system to ground water, or mitigation of the rapid percolation <br /> rate by septic system design or enhancement. <br /> • <br /> • <br /> LOGE 1718 Page 8 <br />