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The soil samples collected beneath the gasoline UST were analyzed for TPHg and � P BTEX. The largest concentrations of TPHg (260 ppm), benzene (0.23 ppm), toluene (4.7 ppm),), ethylbenzene (4.3 ppm) and xylenes (51 ppm) were detected beneath the . east end of the tank. The TPHg and benzene concentrations exceeded both State and County guidelines. i The soil samples collected from beneath the waste oil UST were analyzed for TPHd, TPHg, TOG, BTEX, total lead, CAM 17 metals, VOH, and PCBs. Analysis of the sample collected from the west end of the tank indicated concentrations of TOG at 3,600 ppm, BTEX was detected at low concentrations, CAM 17 metals were detected at concentrations below the Total Threshold Limit Concentrations (TTLC), and of the VOH compounds, tetracholoroethene (PCE) was detected at 0.16 ppm. Lead and PCBs were not detected in the west end sample, and none of the compounds were detected in the east end sample. However, the motor oil and PCE concentrations from the west end of the waste oil UST warranted additional site characterization studies. Client contracted with AGI to perform a site characterization. On April 23 and April 24, ' 1991, six (6) soil borings were advanced in the vicinity of the former USTs to assess the lateral and vertical extent of soil impaction. Four (4) soil samples collected in the vicinity of the former gasoline UST were analyzed for TPHg and BTEX. TPHg (2800 ppm), benzene (0.55 ppm), toluene (0.46 ppm), ethylbenzene (0.44 ppm) and xylenes �. (19 ppm) were detected in only one (1) sample. Five (5) soil samples collected from the vicinity of the former waste oil UST area were analyzed for TOG and VOR The largest concentrations of TOG (4700 ppm), PCE (0.70 ppm) and 1 ,1 ,1-Trichloroethane '(0.061 ppm) were reported for the sample collected at a depth of 15 feet BSG in boring TH-4, which was located over the former waste oil UST. Based upon the chemical analytical results and field observations, AGI concluded that the soil impacted by gasoline appeared to be limited to an area near the base of the former gasoline UST. The waste oil impacted soil extended to a depth of approximately 20 feet BSG over a circular area with a 10 foot radius, centered over the former waste oil UST. AGI prepared a report of findings which included an investigation of three alternative remedial measures. The report recommended excavation, on-site aeration of the gasoline impacted soil and landfill disposal of the waste oil impacted soil as the most effective means of removing the contamination at this site. Mr. Michael Infurna, the County representative for this site, concurred with the remediation option recommended by AGI. Client contracted with AGI to submit a workplan and implement the remediation procedures. In July, 1992, the workplan was approved by Mr. Infurna, and remedial operations commenced on September 16, 1992. 1, ,� 4 of 10