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[4] Cont. <br /> Our percolation tests were conducted according to San Joaquin County Department of Environmental <br /> Health regulations. The Field Test Data Sheets with the percolation test results can be found in the <br /> Appendix. The representative depths of seven feet for the south (1-S) boring and five feet for the <br /> north boring (2-N) indicate a relatively rapid perc rate. Due to these favorable perc rates at these <br /> depths, deeper perc tests were not performed. A discussion of these rates, and septic system design <br /> recommendations will follow in the Conclusions section of this report. <br /> 151 LOCAL GROUNDWATER AND SURFACE WATER INFORMATION <br /> The groundwater, or the zone of saturation is located at approximately 55 ft below grade <br /> according to maps published by the Flood Control District. There was no evidence of a perched <br /> water table condition during our exploratory boring procedures. <br /> Analysis of water drawn from a domestic well near Due Road and Lone Tree Road, illustrates a <br /> concentration of nitrate at 30 ppm NO3. Per the requirements of the Environmental Health <br /> Department, both DBCP and EDB were not analyzed. There are no surrounding vineyards where <br /> these two pesticides could have been used before they were canceled by the EPA. <br /> There is no potential impact to surface waters in the area. <br /> [6] CONCLUSIONS <br /> The percolation test results indicate a septic system with a 6,000 to 8,000 square foot leachfield <br /> may be utilized with the addition of sumps or seepage pits for possible development on the two <br /> Parcels. An 8,000 to 10,000 square foot leaching area is recommended if there is potential <br /> influence from the hardpan layer. This layer will be encountered during the installation of the <br /> septic system. If the contractor finds pervasive hardpan at the depths our borings indicate, then <br /> the leachfield should be increased in size, unless the contractor can sufficiently break through the <br /> hardpan to promote effluent drainage. Seepage pits or sumps should be used to ensure that <br /> effluent percolation is below the hardpan layer. <br /> ka *nlity C-Ontrol Inspecti(n <br />