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WW 26 May 1998 AGE-NC Project No. 97-0326 Page 4 of 5 4.2. ANALYTICAL RESULTS OF SOIL SAMPLES TPH-g was detected in samples T1-S, T2-S and T2-C at concentrations of 1,400 parts per million (ppm, reported as milligrams per kilogram), 25 ppm and 850 ppm, respectively. Concentrations of TPH-g in the piping samples ranged from below detection limits to 9,600 ppm. Benzene was not detected at the site. MTBE was detected at concentrations as high as 1.4 ppm in sub-UST and sub- piping soil samples. Total lead was detected at concentrations ranging from 7.2 ppm to 20 ppm in samples collected beneath the former leaded gasoline UST. Analytical results of soil samples are summarized on Table 1. The laboratory report (AAL Batch No. 98-0217-005 and 98-0225-020) and chain-of-custody forms are included in Appendix B. 4.3. ANALYTICAL RESULTS OF STOCKPILE SAMPLES Petroleum hydrocarbons were not detected in samples SP-1 and SP-2 collected from soil stockpiled on-site. TPH-g and tert-butanol were detected in sample SP-3 at concentrations of 7.5 ppm and 0.16 ppm, respectively. Intense hydrocarbon odor was noted in this stockpile. Therefore, this soil was transported for disposal. TPH-g was detected in composite samples S-1,2,3 and S-4,5,6, collected from the soil transported to Forward, at concentrations of 17 ppm and 50 ppm, respectively. 5.0. SUMMARY AND CONCLUSIONS Based upon observations and data collected from the site. AGE concludes the following: • A predecessor set of USTs were formerly located at the site as evidenced by additional product and vent piping were discovered during the current UST removal. The locations of this piping indicated that two predecessor USTs were located at the same location as the recently removed USTs. • TPH-g was detected in soil samples collected beneath the former UST inverts at concentrations as high as 1,400 ppm. TPH-g was previously detected in soil samples collected from a boring advanced at the site at concentrations as high as 1,000 ppm (132-40). Petroleum hydrocarbons were not detected in samples collected at the north end of the USTs. TPH-g was detected in piping samples at concentrations as high as 9,600 ppm. • Total lead was detected at concentrations similar to background. Lead does not appear to be a problem at the site. Advanced GcoEn%ironmental,Inc.