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L <br /> ` May 26, 2005 <br /> NOA Project Number: E05004A <br /> j Table 4. <br /> b' Soil Boring Log for P-1 and P-2. <br /> LDepth Interval(ft) Soil Type Unified Soil Classification <br /> 0-1.5 Dark brown to red,moist,silty fine sand with clay SM <br /> L1.5-3.5 Dark brown,moist,silty clay CL <br /> 3.5-25 Brown,moist,lean clay with silt CL <br /> Note:Conditions were comparable in all holes,shallow and deep. <br /> kl5.4 Discussion of Soil Lithology <br /> A visual inspection of the shallow and deep soils from on-site drilling indicates some potential for <br /> L achieving a satisfactory percolation rate. 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 soils. <br /> ✓6.0 PERCOLATION TEST INFORMATION <br /> L6.1 Percolation Test Locations <br /> A site map indicating the locations of the percolation test holes is included as Plate 1 of this report. <br /> L //6.2 Number of Percolation Tests <br /> L One shallow and one deep percolation test were conducted on each proposed parcel of the Site, for <br /> /a total of two shallow and two deep percolation tests. <br /> L /6.3 Boring Preparation and Presaturation <br /> The shallow soil borings on Parcels 1 and 2 were advanced on the Site with a hand auger on May 4, <br /> L 2005.The deep soil borings on Parcels 1 and 2 were advanced with a truck-mounted deep rock <br /> auger rig on May 12 and 13,2005. <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. 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 /> Lwas used to backfilled in the annular space. <br /> Presaturation of the percolation test holes occurred on May 17, 2005. The depth of water used to <br /> Lpre-soak was 12 inches above the bottom of the boring. <br /> L 8 '004 <br />