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` i January 24,2005 NOA Project Number: E04158A Table 4. Generalized Soil Boring Lo Depth Interval (ft) Soil Type Unified Soil Classification 0 - 2 Dark brown, sandy silty w/clay,moist. Fill 2 - 3 Reddish brown silty clay with sand and ML-SC silty sand with clay,moist. 3.5 - 25 Reddish brown to light brown, sand, sandy silt with clay,silty sand.. SC - SM Note: Conditions were comparable in all holes, shallow and deep. 6. 5.4 Discussion of Soil Lithology LA visual inspection of the shallow and deep soils from on-site drilling indicates potential for satisfactory percolation. A percolation test is the best method to determine the suitability of the soils. Please see the next section for percolation test results. Generally speaking,gravelly soils have much greater potential for percolation than fine-grained soils. L 6.0 PERCOLATION TEST INFORMATION 6.1 Percolation Test Locations LA 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 percolation test was conducted on each proposed parcel of the Site. One deep percolation test was conducted on each of Parcel 1 and Parcel 2. A total of four shallow and two deep percolation tests were conducted. 6.3 Boring Preparation and Presaturation The shallow soil borings on Parcels 1,2, 3,and 4 were installed on January 10,2005 using a hand L auger. The deep soil borings on Parcels 1 and 2 were installed on the Site with a truck-mounted B53 augur rig on January 20, 2005. L A 1.5-inch diameter PVC pipe with perforations on the bottom was installed in each boring after placing approximately 2 inches of"pea gravel" in the bottom of the open soil boring. Several feet of "pea gravel" was then backfilled in the annular space surrounding the PVC pipe.. L 8 L "044 V