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July 11,2007 <br /> NOA Project Number: E07094A <br /> F1Table 3. <br /> Soil Boring Log Subject Property Shallow and Deep). <br /> Depth Interval{ft) Soil Type Unified Soil Classification <br /> 4 1 0-1 Grey aggregate with gravel <br /> 1-5 Grey silty sand SM <br /> S_g Light grey silty clay CL <br /> 8-25 Brown silty clay CL <br /> F1Note:Descriptions are representative of soil conditions encountered in both shallow and deep borings. <br /> 5.4 Discussion of Soil Lithology <br /> A visual inspection of the dee soils from on-site drilling indicates little potential for satisfactory <br /> P p <br /> percolation. A percolation test is the best method to determine the suitability of the soils for a <br /> F1septic disposal area. Please see the next section for percolation test results. Generally speaking, <br /> coarser grained soils have much greater potential for percolation than fine-grained soils. <br /> fill <br /> ` 6.0 PERCOLATION TEST INFORMATION <br /> F! 6.1 Percolation Test Locations <br /> A site map indicating the locations of the percolation test holes is included as Plate 1 of this report. <br /> 6.2 Number of Percolation Tests <br /> One shallow and one deep percolation test were conducted on the site. <br /> 6.3 Boring Preparation and Presaturation <br /> The soil borings on the site were advanced with a truck mounted rock auger ri <br /> g <br /> g on June 6, 2007. <br /> i 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 /> F1was used to backfill in the annular space. <br /> Presaturation of the percolation test holes occurred approximately 24 hours prior to the percolation <br /> testing. The depth of water used to pre-soak was 12 inches above the bottom of the boring. <br /> ! 8 <br />