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Xx July 1999 AGE -NC Project No. 99-0557 Page 7 of 8 Petroleum hydrocarbon compounds were detected in 1 of the 19 soil samples analyzed (Table 1). The reported detections of petroleum hydrocarbon compounds were in a soil sample collected from soil probe boring P-6 located adjacent to a hydraulic lift within the dealership service department. TPH-g, TPH-d, and TPH-mo were detected in the soil sample collected at 10.5 feet bsg at concentrations of 1.4 mg/kg, 13,000 mg/kg, and 16,000 mg/kg, respectively. Laboratory analytical results indicate that a release of petroleum hydrocarbons has apparently occurred from the hydraulic lift located adjacent to probe P-6. There were reported detections of BTEX, TPH-g, TPH-d, TPH-mo TBE r PCBs In any of the soil w, samples collected from the additional hydraulic lift locations, former gasoline and waste oil UST locations, or areas of surficial staining. Based on the laboratory analytical results, no Q } releases of petroleum hydrocarbons were detected from the additional hydraulic lift's locations, former gasoline and waste oil UST locations, or areas of surficial staining. Concentrations of TPH-d and TPH-mo were detected in one of the three ground water samples analyzed (Table 2). TPH-d and TPH-mo were detected in the ground water sample collected from probe boring P-6 at 2,300 /..tg/l and 3,300 E.ig/1, respectively. Analytical results indicate that a release of petroleum hydrocarbon compounds has apparently occurred from the hydraulic lift located adjacent to probe P-6 and has impacted ground water. The reported concentration of TPH-d exceeded the U.S. Environmental Protection Agency -suggested Drinking Water Health Advisory or Suggested No -Adverse -Response Level (SNARL) for toxicity other than cancer risk of 100 ,ug/l. There is no State or Federal EPA -suggested or -established contaminant level for TPH-mo in ground water. Based on the laboratory analytical results, no releases of petroleum hydrocarbons were detected at the other hydraulic lift locations or the former location of the gasoline UST. 7.0. RECOMMENDATIONS Based upon data reviewed and collected at the site, AGE recommends: Removal of hydraulic fluid and/or miscellaneous fluid (i.e., brake fluid, motor oil, water, etc.) that may have collected in the sumps of the twin -post hydraulic lifts (adjacent to probe locations P-1, P-5, P-6, P-7, and P-9) to prevent any additional and/or potential release of petroleum hydrocarbons. Additional site assessment activities to evaluate the lateral extent of petroleum hydrocarbon impact to soil and ground water related to the hydraulic lift located adjacent to probe boring P-6. It is recommended that additional site assessment consist of the advancement of up to three soil probe borings in the area surrounding the hydraulic lift for the collection and analysis of soil and ground water samples. Based on the analytical results, there appears to be no petroleum hydrocarbon impacts related Advanced GcoEnvironmental, Inc.