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22 June 2001 AGE-NC Project No 97-0333 Page 2 of 10 Volatile aromatics compounds (benzene, toluene, ethylbenzene and xylenes BTEX) were detected in soil samples collected beneath the east ends of three USTs at concentrations ranging up to 340 mg/kg, beneath the west ends of the USTs at concentrations ranging up to 2 7 mg/kg, and beneath product piping at concentrations ranging up to 880 mg/kg Fuel oxygenated compounds(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 ranging up to 16 mg/kg, beneath the west ends of the USTs at concentrations ranging up to 3 I mg/kg, and beneath product piping at concentrations ranging up to 690 mg/kg ' Analytical results are summarized in Table 1 ' 2 3 PREVIOUS SUBSURFACE INVESTIGATION The following is a summary of previous investigations at the site of the unauthorized release of fuel ' products to the subsurface ' 15 Apid 1999 - Six soil bonngs (P-1 through P-6) were advanced at the site to assess the lateral and vertical extent of petroleum impacted soil and ground water (r figure 2) A total of 17 soil samples and five ground water samples were collected during the investigation and ' were submitted for laboratory analysis TPH-g and total petroleum hydrocarbons quantified as diesel (TPH-d) were detected in analyzed soil samples at concentrations as high as 390 mg/kg, dissolved TPH-g and TPH-d were detected in grab ground water samples at ' concentrations ranging as high as 310,000 micrograms per liter (µg/1) BTEX compounds were detected in selected soil samples and grab ground water samples at concentrations as high as 51 mg/kg and 48,000,ug/l, respectively MTBE, TAME and TBA were detected in ' selected soil samples and grab ground water samples at concentrations as high as 0 36 mg/kg and 310,000 µg/1 Results of the April 1999 investigation were reported In Preliminary Investigation and Evaluation Report (PIER) dated 11 June 1999 prepared by AGE 29 June 2000 - Ground water monitoring wells MW_I, MW-2, MW-3, MW-4 and MW-5 were installed on- and off-site to assess the lateral and vertical extent of petroleum-impacted ' soil and ground water A total of seventeen soil samples were collected during drilling activities and submitted to a DHS-certified laboratory for analysis for TPH-g,BTEX,MTBE, ETBE, TAME, DIPE, TBA, 1,2-DCA, EDB, methanol and ethanol 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 MWA, MW-2 and MW-4 at concentrations as high as 6 7 mg/kg, MTBE and TAME were detected in soli ' samples collected from MW_I, MW-2 and MW-3 at concentrations ranging 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 Advanced GeoEnwrun mental,Inc