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L` 31 January 2000 AGE-NC Project No 97-0290 Page 3of10 due the Influence of pumping of municipal wells near the site Historic operation of nearby municipal wells may account for the deeper northerly and easterly extent of contaminants from the site These wells are no longer In operation • TPH-g was detected in ground water samples collected at concentrations as high as 45,000 parts per billion (ppb, reported as micrograms per liter, MW-2) TPH-d was detected in ground water samples at concentrations as high as 4,900 ppb BTEX compounds were detected at concentrations as high as 5,000 ppb, 5,400 ppb, 1,200 ppb and 5,700 ppb, respectively(MW-2) • DIPE and tertiary butanol (TBA) have been detected in water samples collected at the site Other oxygenates have not been detected • The highest concentrations of petroleum hydrocarbons In ground water were detected in samples collected from MW2, P2, P3, B4 and B6 Monitoring wells MW3, MW5, MW6, MW7 and MWS appear to be near the edge or outside the contaminant plume The lateral extent of Impacted ground water has been approximated at the site • An in-situ air sparging and soil vapor extraction pilot tests were performed In May 1999 and a ground water extraction pilot test was performed In July 1999 to examine remedial options • for the site A Corrective Action Plan was prepared and recommended soil vapor extraction and air sparging for remediation of the site 3.0. SCOPE OF WORK Remediation within the "core"petroleum hydrocarbon impacted area at the site will consist of the following tasks • Permitting, planning and pre-field work activities, • Installation of remediation wells, • Installation of above-ground remediation piping system, • Soil vapor extraction system start-up period, • Monitoring and maintenance, • Progress/confirmation sampling Each of these tasks are discussed below in detail • Advanced GeoEnvironmental,Inc