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RECEIVE® 90 6 2016 Appendix A - Site Background Information Page 2 of 5 ENVIRONMENTAL HEALTH DEPARTMENT Benzene, toluene, ethylbenzene and xylenes (BTEX compounds) were detected in soil samples collected beneath the east ends of the USTs at concentrations as high as 340 mg/kg; beneath the west ends of the USTs at concentrations as high as 2.7 mg/kg; and beneath product piping at concentrations as high as 880 mg/kg. Methyl tertiary butyl ether (MTBE), tert-amyl methyl ether (TAME) and tert-butanol (TBA) were detected in soil samples collected beneath the east ends of the three USTs at concentrations as high as 16 mg/kg; beneath the west ends of the USTs at concentrations as high as 3.1 mg/kg; and beneath product piping at concentrations as high as 690 mg/kg. 4.0. PREVIOUS SUBSURFACE INVESTIGATION The following is a summary of previous investigations at the site of the unauthorized release of fuel products to the subsurface: • April 1999- Six soil borings (P-1 through P-6) were advanced at the site to assess the extent of petroleum-impacted soil and groundwater. A total of 17 soil samples and five ground water samples were submitted for laboratory analysis. TPH-g and total petroleum hydrocarbons quantified as diesel (TPH-d) were detected in soil samples at concentrations as high as 390 mg/kg; dissolved TPH-g and TPH-d were detected in grab groundwater samples at concentrations as high as 310,000 micrograms per liter (pg/1). BTEX compounds were detected in selected soil samples and grab groundwater samples at concentrations as high as 51 mg/kg and 48,000 pg/I, respectively. MTBE, TAME and TBA were detected in selected soil samples and grab groundwater samples at concentrations as high as 0.36 mg/kg and 310,000 pg/I, respectively. Results of the April 1999 investigation were reported in Preliminary Investigation and Evaluation Report (PIER), dated 11 June 1999 prepared by AGE. • June 2000-Groundwater monitoring wells MW-1 through MW-5 were installed on- and off-site to assess the extent of petroleum-impacted soil and groundwater. A total of seventeen soil samples were submitted for laboratory analysis. TPH-g was detected in soil samples collected from borings MW-1, MW-2 and MW-4 at concentrations as high as 85 mg/kg; BTEX compounds were detected in soil samples collected from MW-1, MW-2 and MW-4 at concentrations as high as 6.7 mg/kg; MTBE and TAME were detected in soil samples collected from MW-1, MW-2 and MW-3 at concentrations as high as 110 mg/kg. No other fuel components were detected by laboratory analysis. Results of the June 2000 investigation were reported in Quarterly Report - Third Quarter 2000, dated 20 September 2000 prepared by AGE. • August and September 2000-AGE conducted a sensitive receptor survey to locate Advanced GeoEnvironmental,Inc.