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, j I ` , t 29 December,1999 AGE-NC Protect No 97-0312 'y Page 2 of 9 w I 1 ^ r '' fueling Island area Petroleum hydrocarbons were detected to a depth of 80 feet bsg in soil samples r I collected during the Installation of ground water monitoring well UST-1 Low concentrations of benzene were detected during Installation of UST-4 Petroleum hydrocarbons were not detected in soil samples collected during the Installation of UST-2 or UST-3 Ground water samples have been ` collected on 29 occasions between September 1990 and September 1999 Impacted ground water appears to be centered near UST-1 and UST-5 y The well box for UST-1 was found to be in poor condition in 1993, and evidence of Infiltration of water and fuel from the surface was noted, floating product was encountered in UST-1 Ground Water extraction from UST-1 was performed between July 1993 and August 1995 as Interim remediation Approximately 55 gallons of water and product were extracted every two weeks I I ' Previous activities `at the site were described in numerous quarterly reports prepared- by Environmental Science &Engineering, Eric (ESE) between June 1990 and February 1997 22 UST REMOVAL On 18 September 1998, six product USTs were removed from the site A total of nine UST soil '• samples and thirteen piping/dispenser soil samples were collected and analyzed Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) were detected in the samples collected beneath the USTs at concentrations as high as 2,500 parts per million (ppm, reported as milligrams per kilogram) and 32,000 ppm, respectively TPH-g and TPH-d were detected in piping/dispenser samples at concentrations as high as 1,200 ppm and 16,000 ppm, respectively Excavation of additional hydrocarbon-impacted soil was performed after removal of the USTs Procedures and findings were summanzed in the UST Removal Report- September 1997 prepared by AGE , 23 SOIL STOCKPILE,SAMPLING Approximately 400 cubic yards of excavated soil were stockpiled during the removal of,the USTs at the site On 22 November 1997, the stockpiled soil was spread to a thickness of approximately three feet On 24 November 1997, a total of 16 samples were collected from the stockpiled soil and analyzed for TPH-g, TPH-d, BTEX and MTBE TPH-g and TPH-d were detected m'the soil stockpile samples at concentrations as high,as 1,500 ppm and 4,100 ppm, respectively ,Stockpile sampling was,summarized the Quarterly Report-December 1997 r 5 I { 5 i a ' ' d Advanced GeoEnvironmental,Inc 5 I y {I `I I s