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L <br /> LJune 23,2006 <br /> NOA Project Number: E06058B <br /> Page 8 <br /> L ✓5.4 Discussion of Soil Lithology <br /> L A visual inspection of the soils from on-site drilling indicates some potential for percolation because <br /> of the silty nature 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 /> Lsoils have much greater potential for percolation than fine-grained or cemented soils. <br /> LV6.0 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 /> LV'6.2 Number of Percolation Tests <br /> LOne shallow and one deep percolation test were conducted each parcel for a total of four <br /> //percolation tests. <br /> L ✓6.3 Boring Preparation and Presaturation <br /> A total of two shallow and two deep soil borings were advanced on the Site. All borings were drilled <br /> with a truck-mounted deep-rock augur on June 1, 2006. <br /> A 1.5-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of <br /> L 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 /> LPresaturation of the percolation test holes occurred 24 hours prior to the percolation tests. The <br /> 1 depth of water used to pre-soak was 12 inches above the bottom of the borings. <br /> ` /6.4 Condition of Borings After Presaturation <br /> After the 24-hour soak period,the presaturated deep holes were found to be intact and dry on the <br /> Lday of testing. The deep percolation test holes were filled with water.These holes had no movement <br /> and the tests for the deep percolation test holes were canceled. <br /> 4/.5 Percolation Test Procedure <br /> I Percolation tests were conducted for the shallow borings on Parcels 1 and 2 on June 2,2006 in <br /> 8 <br /> ",04L <br /> L <br />