SITE INFORMATION AND CORRESPONDENCE

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2.2 Location of Borings Locations for the three borings are shown on Figure 2. In order to assess possible fuel impacts to !I subsurface soils,two of the borings,IB-1 A and IB-1,were sited within the backfilled fuel dispenser excavation cavity. (After coring to 12 feet in depth,a coring barrel became stuck in IB-1 A,and IB-1 was cored adjacent to IB-lA after attempts to remove the stuck tool in a timely manner failed.) Investigative boring IB-2 was sited approximately ten feet in an expected d downgradient(northeast) direction from the former fuel dispenser. 2.3 Drilling and Sampling of Investigative Soil Borings The three investigative soil borings,IB-IA, IB-1, and IB-2,were drilled by Kvilhaug Well Drilling using GeoprobeTM hydraulically-driven soil coring equipment. After coring to 12 feet in depth in IB-lA, the coring barrel became stuck. After numerous failed attempts to remove this stuck tool, Kvilhaug Well Drilling finally removed this tool on Friday,January 7,2000,and boring IB-1 A was grouted in accordance with permit requirements. Boring IB-1, which replaced IB-1 A, was drilled to a total depth of 20 feet, where sloughing backfill sand precluded deeper coring. Investigative boring IB-2 was cored to a total depth of 28 feet below surface grade, where onslaught of darkness k•' precluded deeper coring. Soil cores from the three investigative borings were collected using a continuous sampler. This coring system allowed for the retrieval of almost continuous soil cores, which were contained in a clear plastic acetate tube,nested inside a stainless steel core barrel. After the core barrel was brought to the surface and exposed,the core was examined, logged,and field screened for hydrocarbons by a qualified Gribi Associates scientist using sight and smell. Soil boring logs for the three investigative borings are contained in Appendix B. Following completion, the three investigative 4 borings were grouted to match existing surface grade using a cementlsand slurry. Subsurface soils were sampled at approximately four-foot intervals starting at about ten feet in depth. After the sample and core barrel were raised to the surface, each sample was collected as follows: (1)The filled acetate tube was exposed for visual examination;(2)The selected sample interval was collected by cutting the sample and acetate plastic tubing to the desired length(typically about six inches); (3)The ends of the selected sample were quickly wrapped with Teflon sheets,capped with plastic end caps,labeled and wrapped tightly with tape; and(4)The sealed soil sample was labeled and immediately placed in cold storage for transport to the analytical laboratory under formal chain- of-custody. All coring and sampling equipment was thoroughly cleaned and decontaminated between each sample collection by triple rinsing first with water, then with dilute tri-sodium phosphate solution, and finally with distilled water. 2.4 Laboratory Analysis of Soil and Water Samples A total of nine soil samples, including one samples from IB-1 A, two samples from IB-1, and six from I13-2, were analyzed for the following parameters: USEPA 8015M Total Petroleum Hydrocarbons as Diesel (TPH-D) USEPA 8020/602 Benzene, Toluene, Ethylbenzene, Xylenes (BTEX) USEPA 8020/602 Methyl-t-butyl Ether(MTBE) GRI B I Associates pa REPORT OF SOIL BORING INVESTIGATION g REIO PLASTICS UST SITE I GA 172-01-01