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L LJune 1, 2006 NOA Project Number: E05179A L5.4 Discussion of Soil Lithology A visual inspection of the shallow soils from on-site drilling indicates some potential for percolation Lbecause of the silty nature of the soils. A percolation test is the best method to determine the suitability of the soils for a septic disposal area. Please see the next section for percolation test results. Generally speaking,coarser-grained soils have much greater potential for percolation than L fine-grained or cemented soils. L 6.0 PERCOLATION TEST INFORMATION 6.1 Percolation Test Locations L A site map indicating the locations of the percolation test holes is included as Plate 1 in the appendix of this report. L 6.2 Number of Percolation Tests L One shallow percolation test was conducted on each parcel. A total of four shallow percolation tests were conducted on the property.A deep percolation test was performed on Parcels B, C and D. 6.3 Boring Preparation and Presaturation One shallow and one deep soil boring were drilled on each parcel exce t f Parcel A which only L had a shallow soil bo g. The four shallow holes were advanced on the site ' A. in hand augur on February 26,2006.Three deep borings were advanced on Parcels B, C and D with a truck- mounted deep rock augur rig. LA 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 1 bottom of the open soil boring,then the PVC pipe was installed on top of the gravel. 'Tea Gravel' L was then used to backfill in the annular space. Presaturadon of the percolation test holes occurred 24 hours before the percolation testes were ' l• performed.The depth of water used to pre-soak was 12 inches above the bottom of the boring. 6.4 Condition of Borings After Presaturation After the 24-hour soak period, the four presaturated holes were found to be intact and dry on the Ldays of testing. L. 6 L L