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• 02 March 1999 AGE-NC Project No 98-0448 Page 2 of 10 of 790 milligrams per kilogram (mg/kg) and 1,200 mg/kg, respectively 23 PREVIOUS INVESTIGATION The following is a brief summary of site assessment activities following the UST removal • In June 1994, one soil boring (B-T)was advanced near the center of the former UST area to 35 feet bsg Laboratory analysis of soil samples collected between 11 and 35 feet bsg detected TPH-g concentrations ranging to 14,000 mg/kg, volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTEX)were detected at concentrations ranging to 1,200 mg/kg A grab ground water sample collected from B-T detected TPH-g at 3,300 micrograms per liter(ag/1) and toluene at 290 /.cg/l • In October 1994,three soil borings(B I through B3)and three ground water monitoring wells (MW-1 through MW-3) were installed at the site to investigate petroleum hydrocarbon- impact near the former UST area Laboratory analysis of soil samples collected from B2, MW-1 and MW-2 detected TPH-g between 20 and 30 feet bsg at concentrations ranging to 1,900 mg/kg, BTEX were detected from MW-1, MW-2, MW-3 and B2 at concentrations ranging to 71 mg/kg • In July 1998, four ground water monitoring wells (MW-4 through MW-7) were installed at the site to further assess petroleum hydrocarbon-impact Laboratory analysis of soil samples collected from MW-4 between 35 and 50 feet bsg detected TPH-g at concentrations ranging to 9 5 mg/kg, BTEX were detected at concentrations ranging to 0 56 mg/kg • Between October 1994 and December 1998, ten ground water monitoring and sampling events were performed at the site TPH-g was detected from wells MW-1 through MW-4 and MW-6 at concentrations ranging to 170,000 µg/l, BTEX were detected from wells MW-1 through MW-4 and MW-6 at concentrations ranging to 40,000 ggll Fuel oxygenating compounds (methyl tertiary butyl ether, di-isopropyl ether and tert-butanol) were detected from wells MW-1, MW-2, MW-4 and MW-6 at concentrations ranging to 91 Yg/l Additional background information prepared by John P Cummings & Associates is summarized in the Report 4'' Quarterly Monitoring, dated 21 November 1997 and submitted to the PHS-EHD Additional background information prepared by AGE is summarized in the June 1998 (dated 20 July 1998), September 1998 (dated 29 October 1998) and December 1998 (dated 29 January 1999) Quarterly Reports submitted to PHS-EHD Advanced GroEmironmental,Inc