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L <br /> October 23,2006 <br /> NOA Project Number. E06103A <br /> /5.4 Discussion of Soil Lithology <br /> A visual inspection of the soils from on-site drilling indicates some potential for percolation because <br /> ` of the silty content of the soils. A percolation test is the best method to determine the suitability of <br /> the soils. Please see the next section for percolation test results. Generally speaking, coarser-grained <br /> soils have much greater potential for percolation than fine-grained or cemented soils. <br /> A <br /> /6.0 PERCOLATION TEST INFORMATION <br /> /6.1 Percolation Test Locations <br /> L A site map indicating the locations of the percolation test holes is included as Plate 1 in the appendix <br /> of this report. <br /> /6.2 Number of Percolation Tests <br /> One shallow and one deep percolation test were conducted on each proposed parcel of the subject <br /> property. <br /> t/6.3 Boring Preparation and Presaturation <br /> LA total of two shallow and two deep soil borings were advanced on the Site.The deep and shallow <br /> soil borings were drilled with a truck-mounted deep rock augur rig on September 7,2006. <br /> LA 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. 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. "Pea gravel" <br /> was then used to backfill in the annular space. <br /> j Presaturation of the percolation test holes occurred approximately 24 hours before the percolation <br /> L• tests.The depth of water used to pre-soak was 12 inches above the bottom of the borings. <br /> L /6.4 Condition of Borings After Presaturation <br /> E After the 24-hour soak period,the presaturated holes were found to be intact on the day of testing. <br /> / <br /> 4 / 6.5 Percolation Test Procedure <br /> L Percolation tests were conducted for the borings on the subject property on September 8,2006 in <br /> accordance with the requirements of the EHD. A percolation test with a duration of four hours was <br /> performed for each hole. The last half an hour was observed by Ms. Lisa Medina, Senior Registered <br /> Environmental Health Inspector, EHD. <br /> L 6 .44 <br />