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I30 August 2004 AGE-NC Project No 99-0592 Page 4 of 13 were attached to an explosive cord at fixed intervals and lowered into the well, the explosive cord extended to the total depth of the well The well was then filled to surface grade using neat cement and the charges were detonated Perforations introduced into the well casing by the projectiles and I explosive cord provided pathways for the cement to fill voids and cavities extending into the formation The well was again filled to surface grade with neat cement All work was overseen by AGE and EHD personnel I 2 4 HISTORICAL PETROLEUM RELEASE AND ASSESSMENT Below is a summary of environmental activities at the-site including tank removal, site assessment and site characterization 1 2 4 1 Underground Storage Tank Removal ' Two 5,000-gallon USTs (Nos 1 and 2), one 12,000-gallon UST (No 3), one 500-gallon UST . (No 4), product piping and associated dispensers were removed from the site on 13 January 1999 ' Reportedly, one 5,000-gallon tank and the 12,000-gallon tank contained gasoline, the other 5,000- gallon tank contained gasoline for twenty-five years and then contained diesel for twelve years,the 500-gallon tank was reportedly utilized for waste oil storage The USTs were removed from three ' separate excavations located near the repair facility(Figure 2) Upon removal of the USTs, soil samples were collected from the floors of the excavations at depths ' between 8 feet and 14 feet below surface grade (bsg) Copies of all manifests and scale tags are included in the AGE-prepared Prehminarylnvestigation and Evaluation Report dated 15 September 1999 Total petroleum hydrocarbons quantified as gasoline(TPH-g)were detected at concentrations as high as 29,800 milligrams per kilogram (mg/kg), volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTEX) were detected at concentrations as high as 2,490 mg/kg, and ' methyl tertiary butyl ether (MTBE) was detected at concentrations as high as 9 1 mg/kg Trichloroethene (TCE) was also detected in a soil sample collected beneath UST (No 4) at a concentrations of 220 microgram per kilogram(µg/kg) Tetrachloroethene(PCE)and TCE were also ' detected in a soil sample collected from the UST (No 4) stockpile at concentrations of 2,100 µg/kg and 490 µg/kg, respectively Results of soil samples from the UST removal are summarized in Tables 3 and 4 Figure 3 shows the approximate locations of the UST removal soil samples 1 • ' Advanced GeoEnvironmental,Inc UA