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' 20 November 2002 AGE-NC Project No 01-0827 ' Page 3 of 5 ' quantified by laboratory analysis of soil samples collected on 11 September 2002 The mass of petroleum hydrocarbons removed was calculated from field and laboratory data ' 3 1 STRATIGRAPHY AND DEPTH TO GROUND WATER Silt and clay with a tan or gray color,apparently depending on hydrocarbon impact,was encountered in the burn area from the concrete base of the dispenser to a depth of approximately 25 feet bsg A petroleum hydrocarbon-like odor was noted in the sidewall samples, mostly from the south wall of the excavation, and in a near-saturated soil sample from the base of the excavation Ground water was present within the excavation at a depth of 25 feet bsg after a duration of 48 hours 32 ANALYTICAL RESULTS FOR SOIL SAMPLES ' A total of sixteen depth-discrete soil samples from the excavation were analyzed for TPH-d/m.o and BTEX compounds by EPA Method 8015 Modified and 8021, respectively • The highest concentration of TPH-mo was detected in soil collected from the south wall of the excavation (Figure 2) TPH-mo was detected samples SW-10 and SW-15 at a concentration of 510 milligram per kilogram (mg/kg), low to moderated concentrations of TPH-mo was also detected in the other soil samples collected from the south wall of the excavation In addition, TPH-mo was detected in the excavation floor sample at a concentration of 320 mg/kg and a low concentration of TPH-mo was detected in sample WW-10 collected from the west wall of the excavation I • TPH-d was not detected in the soil samples collected • BTEX compounds were detected in four soil sample from the south wall of the excavation at concentrations as high as 1 0 mg/kg toluene(SW-25) Ethylbenzene and xylenes were also detected at maximum concentrations of 0 21 mg/kg (SW-15) and 0 54 mg/kg (SW-25), respectively • A low concentration of toluene, 0 021 mg/kg, was detected in the excavation floor sample Other BTEX compounds were not detected in the floor sample • Benzene was not detected in the soil samples collected Analytical results of soil samples are summarized on Table 1 The laboratory reports(CTEL I D No 0209-073), quality assurance and quality control (QA/QC) report and chain-of-custody forms are included in Appendix C I Advanced Ge0Environmental,Inc