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Ms Vicky Mc Cartney Page 3 of 6 analysis, based on field observations and PID readings, were sealed, labeled, and immediately placed in an iced cooler for transportation under chain of custody protocol to Argon All drilling and sampling equipment was decontaminated prior to use and between sample collection events to minimize the possibility of cross contamination "Grab" groundwater samples were collected from bonngs SB 1/SB 1 a and SB2 by driving a groundwater sampler to the desired depth and exposing the screen to the formation Groundwater was extracted through PTFE tubing inserted into the rods to the bottom of the sampler, and transferred directly into appropriate labeled glass containers The containers were then sealed, and placed into a cooled ice chest for transport to Argon Laboratories The completed borings were backfilled to the ground surface with neat cement grout through the drilling rods No soil cuttings were generated All down-hole drilling and sampling equipment was decontaminated by washing with a laboratory grade detergent and rinsing with water Rinseate collected from decontamination procedures was placed in a 55-gallon drum, which is currently stored on site pending disposal Soil and groundwater sample analyses consisted of total petroleum hydrocarbons as gasoline (TPHg) and kerosene (TPHk) using EPA method 8015B, benzene, toluene, ethylbenzene, and xylenes (BTEX) using EPA Method 8021B, 1,2-dichloroethane (1,2-DCA), ethylene dibromide (EDB) and the oxygenated gasoline additives methyl-tert-butyl-ether (MT$E), ethyl-tert-butyl- ether (ETBE), di-isopropyl ether (DIPE), tert-amyl-methyl-ether (TAME), and tert-butyl alcohol (TBA) using EPA Method 8260B 4.0 RESULTS OF INVESTIGATION 4.1 Subsurface Conditions Shallow soil beneath the site generally consists of silty sand to clay from the ground surface to approximately 12-13 feet bgs, silty sand to well graded gravel from 12-13 feet bgs to between 18 and 24 feet bgs, which is underlain by silt to clay Groundwater was encountered within the lower portion of the upper fine-grained unit, at a depth of approximately 11-11 5 feet bgs in borings SB1 and SB2 A copy of the logs from borings SB 1/SB 1 a and SB2 are included in Attachment 2 Cross sections showing site lithology are presented in Figures 4 and 5 4.2 Soil Analytical Results Ground Zero directed Argon to analyze soil samples collected at depths of 12 feet bgs, 15 feet bgs, 20 feet bgs, 24 feet bgs, and 26 feet bgs from boring SB 1 and from 8 feet bgs and 25 feet bgs from boring SB2 The soil sample collected from SB 1 at a depth of 15 feet bgs contained TPHg at a concentration of 290 parts per million (ppm), toluene at 0 51 ppm, ethylbenzene at 0 60 ppm, and xylenes at 3 7 ppm No benzene or gasoline additives were detected in the sample -No�pe'troleum hydrocarbon constituents were detected in any other soil sample collected from boring SB1, or from either of the soil samples collected from boring SB2 Gor , GIGROLTNDZEISouza\Reporls\ADD_SUBSURF_SUM doc