Laserfiche WebLink
kh. '%► .0001 <br /> December 16,2003 <br /> Job Number: LG03-304 <br /> Page l l <br /> Table 4. <br /> Summary of Percolation Tests. <br /> Test No., Percolation Percolation Rate Test Comment <br /> Date Tested Test Depth(ft) (minutes/inch) Duration <br /> v <br /> P-3 shallow, 11-21-03 3.07 62.5 4 hr Failed requirements. <br /> (Parcel 3) <br /> P-3 deep, 11-21-03 7.20 125 4 hr Failed requirements_ <br /> Parcel 3 <br /> r <br /> 6.5 Discussion of Percolation Tests <br /> As a result of the percolation testing, a satisfactory percolation rate was achieved on Parcel 2. <br /> Parcel 2 appears to be suitable for leach line and seepage pits. We recommend that the future <br /> septic system layout for Parcel 2 follow the method prescribed in the Sewage Standards (1996) of <br /> the San Joaquin County Environmental Health Department. <br /> Parcels 1 and 3 did not meet the minimum requirements for percolation rate according to the San <br /> Joaquin County Sewage Standards. These parcels will require retesting in a different location or <br /> an engineered septic system to mitigate the slow percolating shallow soil and deeper hard pan <br /> soils. <br /> Though some water was found in the bottom of the holes, it is likely from recent rain infiltration <br /> into the ground or runnoff getting into the hole. The hard pan layer located about five to six feet <br /> below the ground surface may have channeled the water in to the percolation test holes. The <br /> water within these holes was monitored during the percolation test and failed to demonstrate any <br /> r movement which would indicate satisfactory percolation potential. <br /> 7.0 CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the depth to ground water lies between 115 and 125 feet below ground surface in <br /> •- the vicinity of the Site and flows to the north to northeast at a gradient of between 4 to 7 feet per <br /> mile according to the most recent San Joaquin County Flood Control Maps. The onsite domestic <br /> water well was tested for nitrate and DBCP. DBCP was non-detectable, and nitrate was found at <br /> 25.5 mg/1L-N031 well below the maximum contaminant limit of 45 mg/L-NO3. <br /> � r°Ertso <br /> 1 <br /> Z r <br /> O � <br /> 1,fs OL♦ <br />