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L <br /> LMarch 27,2006 <br /> NOA Project Number: E05144B <br /> L <br /> 1/5.4 Discussion of Soil Lithology <br /> LA visual inspection of the shall - ceps om on-site drilling indicates some potential for <br /> percolation because of the lack o - ained soils enerally speaking, sandy soils have much <br /> Lgreater potential for percolation than fine-grained or cemented soils. <br /> A percolation test is the best method to determine the suitability of the soils. Please see the next <br /> Lsection for percolation test results. <br /> L /6-0 PERCOLATION TEST INFORMATION <br /> /6.1 Percolation Test Locations <br /> LA site map indicating the locations of the percolation test holes is included as Plate 1 in the appendix <br /> of this report. 41,iA cc j <br /> I <br /> /2 Number of Percolation Tests <br /> One shallow percolation test was conducted on each parcel of the Site,and one deep percolation <br /> �. test was conducted on Parcel two and three of the Site, for a total of four shallow and two deep <br /> p colation tests. <br /> L 6.3 Boring Preparation and Presaturation <br /> Two deep soil borings and three shallow borings were drilled on the Site with a truck-mounted deep <br /> L rock augur rig on Match 21,2006. One shallow boring was advanced by hand-auguring on March <br /> 22,2006. <br /> i <br /> L /A 1.5-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of <br /> water in the percolation test boring. Approximately2 inch f" ea uravrl were placed in the <br /> bottom of the open soil boring, then the PVC pipe was installed on top of the gravel. "Pea Gravel" <br /> ti. was then used to backfill in the annular space. <br /> L Presaturation of the percolation test holes occurred on March 21 and 22, 2006.The depth of water <br /> used to pre-soak was 12 inches above the bottom of the borings. <br /> /.4 Condition of Borings After Presaturation <br /> L <br /> After the 24-hour soak period,the presaturated holes were found to be intac end dry-on March 22 <br /> and 23,2006. <br /> L <br /> 8 <br /> .44 <br /> �. <br /> L <br />