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November 24, 1999 <br /> Job Number: S99272 <br /> Page 6 <br /> Four percolation tests were performed in two areas on the two parcels (Plate 1). Three <br /> percolation tests (P-1, P-3 and P-4) were performed within the proposed septic area of the 5 acre <br /> parcel, a forth test(P-2) was performed on the 122.6 acre"designated remainder"parcel near the <br /> 10 foot soil boring. A 4.5 inch auger hole was drilled and two inches of"pea gravel"was placed <br /> in the bottom. A 2 inch PVC pipe with slots on the bottom were installed into the holes then <br /> several feet of"pea gravel"was backfilled in the annular space. One or four hour tests were <br /> performed on percolation test holes. The following table summaries the results of the four <br /> percolation tests: <br /> Table <br /> Summary of Percolation Test Results <br /> Name, Location Depth of test Length Result Comments <br /> Date Tested <br /> P-1 5 acre site 10 feet 1 hour 0.5 Total depth is too close to high <br /> 11-3-99 min/in ground water,retest. <br /> P-2 122 acre site 3.5 feet I hour 11.0 Test performed on"designated <br /> 11-3-99 min/in remainder" site. <br /> P-3 5 acre site 2 feet 4 hour 120.0 Perform test at 2 feet in depth. <br /> 11-19-99 min/in Located near P-1. <br /> P-4 5 acre site 3 feet 4 hour 13.0 Perform test at 3 feet in depth. <br /> 11-19-99 min/in Located near P-1. <br /> VH. CONCLUSIONS AND RECOMMENDATIONS <br /> In conclusion, the percolation test indicates a that a percolation rate of 13.0 minutes per <br /> inch (test P-4)for a depth of 3 feet was obtained within the proposed leach field area of the 5 <br /> acre parcel. A percolation rate of 11.0 minutes per inch was obtained for a depth of 3.5 feet at a <br /> location on the"designated remainder"parcel (Plate 1). No groundwater was encountered in <br /> either of the 10 foot borings. Based on the recent San Joaquin County Flood Control Maps,the <br /> depth to"high"ground water most likely is about 10 to 11 feet for the spring season(spring 1998 <br /> map) and drops to a depth of about 16 to 17 feet in the fall (fall 1997 map). <br /> Based on the results of this study, we believe the soils of both parcels are suitable for a <br /> septic system and leach lines. We do not believe the use of the septic system will negatively affect <br /> ground water quality of the area. Due to the potential high groundwater, the use of seepage pits <br /> ?pERSO <br /> f ti <br /> Z r <br /> O � <br /> r <br /> SSS O G <br />