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' 04 April 2001 AGE-NC Project No 95-0144 Page 7 of 9 ' 3 5 ANALYTICAL RESULTS OF WATER SAMPLES During the November 2000 monitoring event,TPH-g was detected m samples from monitoring wells MW-21A, MW-21B and MW-4 at concentrations of 2,700 gg/l, 730 and 57 µg/1, respectively BTEX compounds were detected in samples from wells MW-1, MW-4, MW-21A and MW-21B at concentrations as high as 230 gg/1(benzene, MW-21A) TPH-d was detected in each sampled well, with the exception of MW-1, at concentrations ranging from 3,200 gg/1 in MW-21A to 51 gg/l in MW-13 TPH-mo was detected in monitoring well sample MW-21A at a concentration of 630 gg/I Hydrocarbon concentrations in the remaining wells generally remained low or non-detect MTBE was detected in ground water samples from well MW-13,MW-19A, MW19B and MW-21 B at concentrations ranging from 1 1 gg/l in MW-13 to 1 6 gg/l in MW-19A and MW-19B (EPA Method 8260M) Other oxygenates were not detected in the samples collected at the site during the 1 November 2000 monitoring event Historically, only low concentrations of MTBE and TBA have been detected intermittently at the site Analytical results for November 2000 are summarized on Table 6 Analytical results of recent and historical ground water samples are summarized on Tables ' 6 and 7 The laboratory report (MAI Laboratory I D Nos 54602 - 54611) and chain-of-custody for ns are included in Appendix E 4.0. SUMMARY/CONCLUSIONS Based upon data collected during the soil probe boring investigation, AGE concludes • TPH-g was detected in soil samples at concentrations ranging from 2,300 mg/kg to 8 0 1 mg/kg TPH-d was detected at concentrations ranging from 5,700 mg/kg to 3 1 mg/kg TPH-mo was detected at concentrations ranging from 2,100 mg/kg to 53 mg/kg Petroleum hydrocarbon contamination was detected at depths at great as 36 feet bsg in boring 15B-10 tand 20 feet bsg in soil probe boring 1513-12 Soil samples collected from soil probe borings 1513-11 and 1513-13 contained less than detectable concentrations of the analytes • MTBE was detected at a concentration of 96 gg/kg in soil sample 1513-12-20 No other fuel additives were detected in the remaining ten soil samples analyzed • TPH-g was detected in grab groundwater samples analyzed from soil probe borings 15B--10, 15B-12, and 1513-13 at concentrations of 1,500 gg/l, 4,800 gg/1 and 280 gg/l, respectively TPH-d was detected in grab ground water samples analyzed from each soil probe boring at r concentrations ranging from 570,000 gg/l in boring 15B-12 to 1,600 gg/1 in boring 15B-13 t TPH-mo was detected in grab ground water samples collected from each soil boring at concentrations ranging from 130,000 gg/l in boring 15B-12 to 870 gg/1 in boring 15B-10 Advanced GeoEnvironmental,Inc