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I26 April 2002
<br /> AGE-NC Project No 95-0128
<br /> Page 5 of 7
<br /> Benzene was detected in samples MW-4,MW-5,MW-11B,MW-12B and VW-1 at concentrations
<br /> of 18 µg11, 190 gg/l,0 56µg/1,0 78µg11 and 9 9µg11,respectively The remaining BTEX compounds
<br /> were detected in the same samples at concentrations ranging up to 7,300 µg/1 of xylenes in MW-5
<br /> MTBE was detected by EPA Method 8020 in ground water samples MW-4, MW-5, MW-8, MW-
<br /> 11A,MW11B,MW12A,MW-12B,MW-13,MW-15 and VW-1 at concentrations ranging from 9 9
<br /> µg/l in VW-1 to 960µg/1 in MW-5(off-site) MTBE was quantified by EPA Method 8260 Modified
<br /> in groundwater samples MW-2 through MW-8, MW-11A/B, MW12A/B, MW-15 and vapor well
<br /> VW-1 at concentrations ranging from 1 1 gg/1 in MW-16 to 960 µg/1 in MW-11B
<br /> None other the fuel oxygenates were detected
<br /> The analytical results are summarized on Tables 2 and 3 The laboratory reports for the quarterly
<br /> monitoring event(MAI Laboratory ID No 90559 to 90572 and 90613 to 90617),quality assurance
<br /> and quality control (QA/QC) reports and the chain-of-custody form are included in Appendix B
<br /> Dissolved MTBE is displayed on Figure 4
<br /> • 4 3 ANALYTICAL RESULTS FROM GROUND WATER TREATMENT SAMPLES
<br /> TPH-d, TPH-g, Benzene and MTBE were detected in the November influent sample at
<br /> concentrations of 1,900 gg/l, 9,200 µg/1, 830 µg/1 and 2,100 µg11, respectively
<br /> TPH-d, TPH-g, Benzene and MTBE were detected in the December influent sample at
<br /> concentrations of 1,100 µtg/l, 8,000 µg/l, 750 gg/l and 1,200 µg/l, respectively
<br /> TPH-d,TPH-g,Benzene and MTBE were detected in the January influent sample at concentrations
<br /> of 900 µ.g/1, 11,000 gg/l, 490 gg/l and 780 µg/1, respectively
<br /> TPH-d,TPH-g,Benzene and MTBE were detected in the February influent sample at concentrations
<br /> of 1,100 µg/l, 8,400 µg/l, 490 gg/1 and 660 µg11, respectively
<br /> TPH-d, TPH-g, Benzene and MTBE were detected in the March influent sample at concentrations
<br /> of 1,400 gg/l, 6,700 µg/l, 380 µg11 and 540 µg/1, respectively
<br /> The remaining BTEX compounds were detected in the same samples at concentrations ranging up
<br /> to 1,400 µg/1 (xylenes)
<br /> Advanced GcoEnvironmental Inc
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