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January 4, 2006 <br /> NOA Project Number: E05166B <br /> 5.4 Discussion of Soil Lithology <br /> A visual inspection of the shallow soils from on-site drilling indicates little potential for percolation <br /> because of the clayey nature of the soils. A percolation test is the best method to determine the <br /> suitability of the soils for a septic disposal area. Please see the next section for percolation test <br /> results. Generally speaking, sandy soils have much greater potential for percolation than fine- <br /> grained or cemented soils. <br /> � 6.0 PERCOLATION TEST INFORMATION <br /> X6.1 Percolation Test Locations <br /> A site map indicating the location 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 a c�rcel. The deep tests on <br /> parcels two and three could not be tested because of soil collapsing.A second set of shallow and <br /> deep tests were done on parcel two and three at a later date for a total of sixteen percolation tests. <br /> 6.3 Boring Preparation and Presaturation <br /> One shallow and one deep soil boring were advanced on each parcel on the Site with a truck <br /> mounted deep rock augur rig on December 1,4 and 18, 2005. <br /> .. v' 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. 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 /> Presa=ation of the percolation test holes occurred approximately-24 hours before the percolation <br /> tests.The 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 majority of the presaturated holes were found to be intact on the <br /> day of testing,but seve f the holes contained water.The only holes that were not found intact on <br /> the day of testing were the deep borings on parcels two and three.The percolation tests for those <br /> holes were cancelled. <br /> 8 <br />