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. 28 June 1999 AGE-NC Protect No 97-0333 Page 2 of 9 removal, soil samples were collected from the floor of the excavation and beneath product piping Total petroleum hydrocarbons quantified as gasoline (TPH-g) were detected beneath the east ends of the three USTs at concentrations ranging as high as 2,600 milligrams per kilogram (mg/kg), beneath the west ends of the USTs at concentrations ranging up to 25 mg/kg, and beneath product piping at concentrations ranging as high as 8,000 mg/kg Volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTEX) were detected 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 to 880 mg/kg Fuel oxygenates (methyl tertiary butyl ether MTBE, tert-amyl methyl ether TAME and tert- butanol TBA) were detected 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 1 mg/kg, and beneath product piping at concentrations ranging up to 690 mg/kg Analytical results of soil samples collected during tank removal activities are summarized in Table 1 22 PREVIOUS SUBSURFACE INVESTIGATION On 15 April 1999, a total of six soil probe borings (P-1 through P-6) were advanced at the site to assess the lateral and vertical extent of impacted soil A total of 17 soil samples and five grab ground water samples collected during the investigation were submitted for laboratory analysis Total petroleum hydrocarbons quantified as gasoline (TPH-g) were detected in analyzed soil samples at concentrations up to 390 milligrams per kilogram (mg/kg), dissolved TPH-g were detected from selected grab ground water samples at concentrations ranging as high as 310 000 micrograms per liter(4g/1) Total petroleum hydrocarbons quantified as diesel(TPH-d)were detected in analyzed soil samples at concentrations as high as 49 mg/kg, dissolved TPH-d was detected from selected grab ground water samples at concentrations ranging as high as 9,100,ug/l Volatile aromatics benzene, toluene, ethylbenzene and xylenes (BTEX) 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 Methyl tertiary butyl ether (MTBE) was detected in selected soil samples and grab ground water samples at concentrations as high as 140 mg/kg and 810,000 ugll, respectively Results of the April 1999 investigation were reported in the Preliminary Investigation and Evaluation Report (PIER) dated 11 June 1999 prepared by AGE Analytical results of soil samples collected during the Apnl 1999 investigation are summarized in Tables 2 and 3 Advanced GeoEnAwonmenH] ]„c