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26 May 1998 <br />AGE -NC Project No. 97-0326 <br />Paee 4 of 5 <br />4.2. ANALYTICAL RESULTS OF SOIL SAMPLES <br />TPH-g was detected in samples T1 -S, T2 -S and T2 -C at concentrations of 1,400 parts per million <br />(ppm, reported as milligrams per kilogram), 25 ppm and 850 ppm, respectively. Concentrations of <br />TPH-g in the piping samples ranged from below detection limits to 9,600 ppm. Benzene was not <br />detected at the site. MTBE was detected at concentrations as high as 1.4 ppm in sub -UST and sub - <br />piping soil samples. Total lead was detected at concentrations ranging from 7.2 ppm to 20 ppm in <br />samples collected beneath the former leaded gasoline UST. Analytical results of soil samples are <br />summarized on Table 1. The laboratory report (AAL Batch No. 98-0217-005 and 98-022-5-020) and <br />chain -of -custody forms are included in Appendix B. <br />4.3. ANALYTICAL RESULTS OF STOCKPILE SAMPLES <br />Petroleum hydrocarbons were not detected in samples SP -1 and SP -2 collected from soil stockpiled <br />on-site. TPH-g and tert-butanol were detected in sample SP -3 at concentrations of 7.5 ppm and 0.16 <br />ppm, respectively. Intense hydrocarbon odor was noted in this stockpile. Therefore, this soil was <br />transported for disposal. TPH-g was detected in composite samples S-1,2,3 and S-4,5.6, collected <br />from the soil transported to Forward, at concentrations of 17 ppm and 50 ppm, respectively. <br />5.0. SUMMARY AND CONCLUSIONS <br />Based upon observations and data collected from the site, AGE concludes the following: <br />A predecessor set of USTs were formerly located at the site as evidenced by additional <br />product and vent piping were discovered during the current UST removal. The locations of <br />this piping indicated that two predecessor USTs were located at the same location as the <br />recently removed USTs. <br />TPH-g was detected in soil samples collected beneath the former UST inverts at <br />concentrations as high as 1,400 ppm. TPH-g was previously detected in soil samples <br />collected from a boring advanced at the site at concentrations as high as 1,000 ppm (132-40). <br />Petroleum hydrocarbons were not detected in samples collected at the north end of the USTs. <br />TPH-g was detected in piping samples at concentrations as high as 9,600 ppm. <br />Total lead was detected at concentrations similar to background. Lead does not appear to be <br />a problem at the site. <br />Advanced CeoEnvironnIM21. Inc. <br />