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L •� LJune 1,2006 NOA Project Number: E05148B 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 sandy 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 Lfine-grained or cemented soils. V 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 platelthe appendix of this report. L6.2 Number of Percolation Tests LOne shallow and deep percolation test were conducted on each parcel. A total f six hallow percolation tests were conducted on the property. L6.3 Boring Preparation and Presaturation One shallow and one deep soil boring were drilled on each parcel using a truck-mounted deep rock L augur rig on May 16,2006. L 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 then used to backfill in the annular space. I Presaturation of the percolation test holes occurred 24 hours before the percolation testes were performed.The depth of water used to pre-soak was 12 inches above the bottom of the boring. 4 6.4 Condition of Borings After Presaturation LAfter the 24-hour soak period,the four presaturated holes were found to be intact and dry on the days of testing. L6.5 Percolation Test Procedure Percolation tests were conducted for the borings on May 17,2006 in accordance with the Lrequirements of the EHD. A percolation tests with a duration of four hours were performed for 6 L .*44 L