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' 11 August 1997
<br /> AGE-NC Project No 95-0173
<br />' Page 7 of 10
<br />' ppm Toluene, ethylbenzene and xylenes were detected in samples collected from soil probe borings
<br /> B-3, B-4, B-6, and from wells MW-6, MW-7, VW-i and VW-2 The highest concentrations of the
<br /> remaining aromatic hydrocarbons were reported in the 20-foot sample from VW-2 at 580 ppm, while
<br />' the lowest concentrations were reported in the 35-foot sample from MW-7 at 0 0052 ppm The
<br /> analytical results of selected soil samples are summarized in Table 1 The laboratory reports (Castle
<br /> Analytical Laboratory Reference No 975 and 1151) and chain-of custody forms are included in
<br />' Appendix G
<br /> MTBE was not detected in soil samples submitted for laboratory analysis utilizing EPA method 8020
<br />' However, MTBE was detected in the 30-foot sample from VW-1 and in the 20-foot and VW-2 at
<br /> concentrations of 0 026 and 0 064 ppm, respectively, utilizing EPA method 8260 (Appendix D)
<br />' One soil sample (VW-2 at 25-feet) was submitted for microbial enumeration and physicochemical
<br /> laboratory analysis The results of the analysis indicated that nitrate nitrogen was present at 9 0 ppm,
<br /> ammonium nitrogen at 17 0 ppm, orthophosphate at 17 8 ppm, potassium at 91 ppm, while moisture
<br /> was reported at 15 7% Furthermore, general microbial enumeration was not detected and the result
<br /> of the selected microbial enumeration was 0 004 CFU X 10'/gr
<br /> 3 3 ANALYTICAL RESULTS OF GROUND WATER SAMPLES
<br /> A total of four grab ground water samples were collected from B-3, B-4, B-6, B-7, while nine ground
<br /> water samples were collected during quarterly sampling from wells MW-1 through MW-9 All ground
<br /> water samples were submitted to a state-certified laboratory for analysis of TPH-g, TPH-d, BTEX
<br /> and MTBE TPH-g was detected in ground water samples collected from B-3,-B-4, B-6, B-7, and
<br /> wells MW-1 through MW-4, MW-6, MW-8 and MW-9 The highest concentrations of TPH-g were
<br /> reported from MW-3 and B-3 at 140,000 micrograms per liter (or parts per billion ppb), while the
<br /> lowest was reported from MW-8 at 110 ppb
<br /> TPH-d was detected in grab ground water samples collected from soil probe borings B-3, B-4, B-6,
<br /> B-7, and wells MW-1 through MW-4, MW-6, MW-8 and MW-9 The highest concentrations of
<br /> TPH-d was reported from MW-4 at 44,000 ppb, while the lowest was reported from MW-8 at 110
<br /> ppb Furthermore, the laboratory reported that the chromatograms of hydrocarbons in both grab
<br /> ground water samples and in quarterly ground water samples were not consistent with those of diesel
<br /> fuel
<br /> rBenzene was detected in
<br /> grab ground water samples collected from soil probe borings B-3, B-4, B-6,
<br /> B-7, and from quarterly ground water samples collected from wells MW-1 through MW-4, MW-6
<br /> and MW-9 The highest concentrations of benzene was reported from MW-3 at 18,000 ppb, while
<br /> the lowest was reported from B-7 at concentrations of 46 ppb Toluene, ethylbenzene and xylenes
<br /> were detected in ground water samples collected from soil probe borings B-3, B-4, B-6, and from
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