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27 March 2000 AGF-NC Project No. 98-0450 Page 3 of 19 2A. INITIAL SITE INVESTIGATIONS lnfortnation regarding previous investigations conducted at the site was obtained from Pi-eliminai-T Site Assessment Repnw, dated October 1 L 1995, prepared by the Clearwater Group. Inc. In July 1995 two around water monitoring wells (BMW] and BMW2) were installed at the site. The wells were sampled five times between 1995 and May 1998. The greatest concentration of total petroleurn hydrocarbons as gasoline (TPH-g) and benzene, toluene, cthylbcnzenc. and total xylenes (I TFX) compounds were detected during the May 1998 quarterly ground water monitoring event. TPI I-g was detected at 12.000 micrograms per liter(jg/l)and BTEX compounds were detected at concentrations up to 1,900 ugll (xylene). 2.5. UST R1 MOVAI. ]n FehrUary 1998. three USTs and the associated product distribution system were removed from the site. Details of the UST removals and soil sampling were presented in reports by Thorp Oil to the PHS-FI ID. I Ivdrocarbons in soil were detected in the area of the former US`fs. The hydrocarbon-impacted soil was reported to be limited to the northern portion of the UST-removal area and at the western edge of the dispenser island and was encountered at a depth oft5 feet below surface grade (bsg) at 5 feet bsg. respectively. 2.6. ADDITIONAL SITV V ASSESSMENT On 28. 29 and 30 October 1998. three additional ground water monitorim, wells. two soil gas/vapor wells and Tour Soil borin-s were installed on-site. Soil boring 13MW'3 was completed as ,round water monitoring well BMW3 at the northwest edge of the site. Sol] boring 5134 was completed as ground water monitoring well BMWq in the center of'the former UST area. Soil boring BMW5 was completed as ground water monitoring well BMW5 at the eastern edge of the site. Soil borings SI35 and SB6 were advanced at the approximate ends of the lormer northern dispenser island and were completed as soil vapor extraction wells VW 1 and VW2, respectively. Additionally. soil horing SBI Was established at the northwestern eds(,c of the former UST excavation to determine if soil contamination extended laterally north of the former UST area. Soil borings SB2 and S133 were advanced at a 35" angle from vertical under the adjacent property north of the site. to determine the lateral extent of the hydrocarbon impact to soil and ground water. Soil boring S137 was established at the approximate west end of the former southern dispenser island. .-I eliwirccd eu 1.1 in i ron men I a 1.1 nc.