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April 20,2005 <br /> NOA Project Number: E05022B <br /> L. 5.4 Discussion of Soil Lithology <br /> L A visual inspection of the shallow and deep soils from on-site drilling indicates some potential for <br /> percolation because of the silty nature of the soils. A percolation test is the best method to <br /> determine the suitability of the soils for a septic disposal area. Please see the next section for <br /> i percolation test results. Generally speaking, sandy soils have much greater potential for percolation <br /> than fine-grained or cemented 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 I in the appendix <br /> Lof this report. <br /> 6.2 Number of Percolation Tests <br /> LOne shallow and two deep percolation test were conducted on Parcel 1. One shallow and one deep <br /> percolation test were conducted on Parcels 2 and 3. A total of three shallow and four deep <br /> Lpercolation tests were conducted on the property. <br /> 6.3 Boring Preparation and Presaturation <br /> LOne shallow and one deep soil boring were advanced on Parcel 1 with the a truck-mounted deep <br /> rock augur rig on April 5, 2005. A second deep soil boring was advanced on Parcel 1 with a truck- <br /> mounted deep rock auger rig on April 18,2005. One shallow and one deep soil boring were <br /> L advanced on Parcels 2 and 3 with the a truck-mounted deep rock augur rig on April 14, 2005. <br /> 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 then used to backfill in the annular space. <br /> Presaturation of the percolation test holes occurred on April 14,2005 and April 18,2005. The <br /> Ldepth of water used to pre-soak was 12 inches above the bottom of the boring. <br /> 6.4 Condition of Borings After Presaturation <br /> LAfter the 24-hour soak period,the presaturated holes were found to be intact on April 15, 2005 and <br /> April 19,2005.The first holes tested on Parcel 1, shallow and deep, contained water on the bottom. <br /> LThe second test of deep soils on Parcel 1 and both the shallow and the deep holes on Parcels 2 and <br /> 8 <br /> L "044 <br /> L <br />