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October 13, 2004 <br /> `it /6.0 <br /> NOA Project Number: E040109A <br /> PERCOLATION TEST INFORMATION <br /> 6.1 Percolation Test Locations <br /> A site map indicating the locations of the percolation test holes is included as Plate 1 in the appendix <br /> of this report. <br /> / <br /> t' 6.2 Number of Percolation Tests <br /> One shallow and one deep percolation test were conducted on each proposed parcel of the Site, for <br /> a total of two shallow and two deep percolation tests. <br /> 6.3 Boring Preparation and Presaturation <br /> The soil borings were advanced on the Site with a truck-mounted B53 augur rig on September 17, <br /> 2004. <br /> A 1.5-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of <br /> water m the percolation test boring. Approximately 2 inches of"pea gravel" were placed in the <br /> bottom of the open soil boring, then the PVC pipe was installed on top of the gravel. Several feet <br /> of"pea gravel" were backfilled in the annular space. <br /> Presaturation of the percolation test holes occurred on September 29,2004. The depth of water <br /> /used to pre-soak was 12 inches above the bottom of the boring. <br /> 6.4 Condition of Borings After Presaturation <br /> After the 24-hour soak period, the presaturated holes were found to be intact and dry on September <br /> 30,2004. <br /> 6.5 Percolation Test Procedure <br /> Percolation tests were conducted for the borings on September 30,2004 in accordance with the <br /> requirements of the EHD. A percolation test with a duration of four hours was performed for each <br /> hole. The final half-hour of each four-hour percolation test was observed by Mrs.Lisa Medina, <br /> Senior Registered Environmental Health Inspector,EHD. <br /> boo <br /> 8 <br /> bm <br /> bn <br />