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07 May 1998 AGE-NC Project No. 98-0448 Page 3 of 6 vertical extent of hydrocarbon-impact. • Drilling and installation of ground water monitoring wells northeast of the former UST area (near boring B-2,inside the warehouse); west of the former UST area; and southwest of the former UST area. These wells will be used to determine the lateral extent of hydrocarbon- impacted ground water east,west and south of the former UST excavation. • A well/sensitive receptor survey will be performed to identify potential sensitive receptors within a 2,000-foot radius of the investigation area. 3.1. DRILLING AND SOIL SAMPLING Soil borings will be advanced utilizing a truck-mounted, hollow-stem drill rig equipped with 8.25- inch or 12-inch hollow-stem augers. Proposed well locations are illustrated in Figure 2. Soil samples will be collected at five-foot intervals, beginning at a depth of ten feet bsg, using a California split- spoon sampler and brass sleeves. The sampler will be driven by dropping a 140-pound weight from a height of 30 inches.The number of blows required to drive each 6-inch length of the sampler(blow counts) are to be recorded on boring logs compiled by an AGE staff geologist. Upon sample retrieval, the middle brass sleeve will be removed from the sampler. The ends of the sleeve will be immediately covered with Teflon sheets and sealed with plastic end caps secured with tape. The preserved samples will then be immediately placed under ice in a chilled container for transportation to a state-certified laboratory. Each soil sample sleeve will be labeled with boring location,vertical depth, sampling time, date and sampler's initials. 3.2. EQUIPMENT DECONTAMINATION All sampling tools and brass sleeves used for sample collection will be thoroughly rinsed with clean water after washing with a solution of Alconox.All hollow stem augers are to be steam-cleaned prior to advancement in each borehole. 3.3. LABORATORY ANALYSIS Selected soil samples will be analyzed for total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d),volatile aromatic compounds(benzene,toluene, ethyl-benzene and total xylenes: BTE&X) and methyl-tert-butyl ether(MTBE) and other oxygenated fuel additives tertiary butyl alcohol (TBA), di-isopropyl ether(DIPE), ethyl tertiary butyl ether (ETBE) and tertiary amyl methyl ether(TAME)in accordance with EPA methods 8015m/5030 and 8020/602 and 8260/8240. Advanced GeoEnvironmentai,Inc.