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• Appendix A - Historical Background River City Petroleum and Connell Motor Lift Truck Page 5 of 14 feet below surface grade(bsg)in the soil boring established within the former UST product line trench area (MW-5), significant concentrations of BTEX compounds were detected from 35 feet to 65 feet bsg in the soil from this area Ground water samples from the former UST and western dispenser areas had detectable concentrations of dissolved hydrocarbons • A total of ten ground water observation wells have been installed and monitored as part of the UST site investigation The lateral extent of the dissolved hydrocarbons has been defined to the east and south by the well network PREVIOUS SITE ASSESSMENT In November 1998,AGE conducted a site visit/reconnaissance of the property as part of a Phase I site assessment for a potential property transfer/assessment, there were no regulatory directives in effect for the property at that time AGE identified several general areas of potential environmental concern, which included a motor oil storage or waste oil transfer area indicated by the previously mentioned above-ground storage tank and two circular depressions on the western edge of the building on the site • The subsequent site-mvestigation activities included soil borings in 1999, cone penetrometer tests (CPTs) in 2000, ground water monitoring well installations in 2001 and vapor well installation in March 2004 February and August 1999 - Phase I/II and Preliminary Site Assessment On 03 February and 27 and 28 August 1999, AGE advanced 30 soil borings (P1 through P29 and M 1),and collected one `grab' ground water sample at the site to assess for petroleum hydrocarbons in the subsurface • Total petroleum hydrocarbons as gasoline and stoddard solvent (TPH-g and TPH-ss) and various aromatic hydrocarbon compounds were detected in soil samples collected from an area along the western edge of the former lift truck building on the site (P 14,P24,P25 and P27), however, each detection of TPH-g was qualified with a notation that the pattern did not appear to be gasoline,but TPH-ss TPH-ss was detected in the area of P 14 at depths of 10 feet to 65 feet bsg at concentrations as high as 8,000 mg/kg, analyzed soil samples collected from depths of 20 feet to 55 feet bsg also contained elevated concentrations of TPH-ss, with significant concentrations detected at 45 feet and 55 feet bsg TPH was detected in soil underlying the western area of the former lift truck building at depths of 10 feet to 65 feet bsg and at concentrations up to 6,300 mg/kg Aromatic hydrocarbon compounds were detected at depths of 25 feet to 55 feet bsg at concentrations as high as 44 • mg/kg (P14, P24, P25 and P27), however, benzene was not detected in any of the soil Advanced GeoEnv:ronmental,Inc