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CONCLUSIONS AND RECOMMENDATIONS In summary, the soil conditions examined in the percolation test locations were found to be suitable. Satisfactory soil percolation rates of 5.2 min/in (Parcel 1) and 6.9 min/in (Parcel 2) were observed. Because the percolation rate encountered falls between five and 30 min/in, the San Joaquin County Environmental Health Department will require an eight-foot separation from the bottom of the dispersal system to ground water. Based on the predicted depth to ground water of 65 to 75 feet, no modifications to standard septic systems should be required. No new construction is anticipated. The depth of ground water based on recent aquifer levels is approximately 65 to 75 feet below the ground surface, depending on the season. The ground-water flow direction is predominantly toward the northwest at a rate of approximately nine to 11 feet per mile in the vicinity of the Site. Mr. Bavaro collected a water sample from his domestic well, and had it analyzed by Far West Laboratories. Nitrate plus nitrite were detected in the sample at a concentration of 7.1 mg/L-N, below the MCL of 10 mg/L-N. Nitrite was not detected above the reporting limit. DBCP was not detected. Based on the current project, the use of on-site septic tanks and drain field systems on the Site is not expected to cause a buildup of nitrate in the aquifer above 3.0 mg/L-N. This level falls well below the US EPA drinking water recommendation of 10 mg/L-N. We believe the Site suitable for the use of standard septic systems utilizing leach lines, leach lines and sumps, or a filter bed. Based on the satisfactory result of the nitrate loading calculation, no nitrate mitigation is recommended. LOGE 1907 Page 16