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L <br /> LFebruary 8,2007 <br /> NOA Project Number: E06161A <br /> L5.4 Discussion of Soil Lithology <br /> LA visual inspection of the soils from on-site drilling indicates potential for percolation because of the <br /> coarse-grained nature of the soils. A percolation test is the best method to determine the suitability <br /> of the soils for a septic disposal area. Please see the next section for percolation test results. <br /> ` Generally speaking, coarser-grained soils have much greater potential for percolation than fine- <br /> grained or cemented soils. <br /> L <br /> 6.0 PERCOLATION TEST INFORMATION <br /> L 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 /> L <br /> One shallow percolation test was conducted on parcels one, two and three. Parcels four, five and six <br /> '` each had two percolation test holes for a total of nine shallow percolation test holes. <br /> 6.3 Boring Preparation and Presaturation <br /> LOne or two shallow percolation test borings were advanced on each parcel of the site on December <br /> 14,2006 using a hand auger.A 1.5-inch diameter PVC pipe with perforations on the bottom was <br /> Lused to measure the drop of water in the percolation test boring. Approximately 2 inches of"pea <br /> gravel"were placed in the bottom of the open soil boring, then the PVC pipe was installed on top <br /> Lof the gravel. 'Tea gravel'was then used to backfill in the annular space. <br /> Presaturation of the percolation test holes occurred approximately 24 hours prior to the percolation <br /> Ltests.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 /> L After the 24-hour soak period, the presaturated holes were found to be intact and dry on December <br /> 15 and 18, 2006. <br /> L <br /> L <br /> 7 <br /> L <br />