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CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions examined near the existing septic system drain field of <br /> the proposed homesite parcel were found to be suitable for a standard septic system <br /> utilizing leach lines or a filter bed. A satisfactory soil percolation rate of 5.95 min/in was <br /> observed in the shallow soil zone. The soil in the test location was found to sandy silt. <br /> The depth of ground water based on recent aquifer levels is approximately 27 to 29 feet <br /> below ground surface. The ground-water flow is to the south at a rate of 4 to 8 feet per <br /> mile in the vicinity of the Site. <br /> Because of the percolation rate between 5.0 and 30.0 min/in encountered in the shallow <br /> test hole, the San Joaquin County Environmental Health Department will require an <br /> eight-foot separation from the bottom of the dispersal system to ground water. Based <br /> on the anticipated depth to ground water, no modifications to standard shallow septic <br /> systems should be required to fulfill this requirement. <br /> A water sample was collected from the domestic well on the proposed homesite parcel. <br /> Neither nitrate nor DBCP was detected in the water sample. <br /> Based on the methods and assumptions described, the nitrate loading calculation <br /> indicates that the use of an on-site septic tank and drain field system on the proposed <br /> homesite parcel has the potential to cause a buildup of nitrate in the aquifer up to 8.0 <br /> mg/L-N, below the MCL of 10 mg/L-N. As a result, no nitrate mitigation is <br /> recommended at this time. <br /> LOGE 2151 Page 14 <br />