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F! F�iApril 15, 2005 NOA Project Number:E040154A Table 4. Soil Boring Log for P-1. Depth Interval(ft) Soil Type Unified Soil Classification '-= -0-3 Black,moist,silty clay CL 3-8 Brown,moist clayey silt with some medium sand ML ' 8-10 Brown,moist silty sand SM 10-25 Brown;moist sandy silt with clay ML Note: Conditions were comparable in all holes. D 5.4 Discussion of Soil Lithology A visual inspection of the shallow and deep soils from on-site drilling indicates same potential for fill satisfactory percolation. A percolation test is the best method to determine the suitability of the soils of the septic disposal area. Please see the next section for percolation test results. Generally (s � } speaking, sandy soils have much greater potential for percolation than fine-grained soils. 6.0 PERCOLATION TEST INFORMATION 6.1 Percolation Test Locations A site map indicating the locations of the percolation test holes is included as Plate 1 of this report. 6.2 Number of Percolation Tests One shallow and two deep percolation tests were conducted on the Site, for a total of one shallow and two deep percolation tests. 6.3 Boring Preparation and Presaturation The soil borings were advanced on the Site with atruck-mounted deep rock drillrig on March 17, 2005 and by hand auger on April 11, 2005. A .1.5-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of water in the percolation.test boring. Approximately 2 inches of"pea gravel' were placed in the bottom of the open soil boring, then the PVC pipe was installed on top of the gravel. "Pea gravel' was used to backfill in the annular space. L Presaturation of the percolation test holes occurred on March 21, 2005 and on April 11, 2005. The (V,3)depth of water used to pre-soak was 12 inches above the bottom of the boring. 7