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<br /> and 3,600 pg/L in MW- 1, MW-2, and MW-3, respectively. Ethylbenzene was detected at concentrations
<br /> 0) V A1%
<br /> `� of 520, §Kand 2,600 pg/L in MW- 1, MW-2, and MW-3, respectively. Total xylenes were detected at
<br /> �U concentrations of 220, 7,300, and 5,700 pg/L in MW- 1, MW-2, and MW-3, respectively.
<br /> 'r6lVetu Ot '6ct6lLIf7J,.uq(L i ISOr,3r �&Wjp, w- 111, 3
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<br /> At MW-1, concentrations of Benzene, Ethylbenzene, and Total Xylenes have decreased exponentially with -.
<br /> time indicating natural attenuation is occurring . At MW-2 and MW-3, concentrations of Benzene,
<br /> C )
<br /> Ethylbenzene, and Xylenes do not show clear exponential decreases with time.
<br /> i
<br /> Toluene and MTBE have also recently been detected at the site. However detected concentrations are =
<br /> below the primary MCLS (150 pg/L for Toluene and 13 pg/L for MTBE) .
<br /> 5 . 3. 2.3 Deeo Zone Grab Groundwater
<br /> Concentrations of TPWg, TPH-k, and BTEX compounds in the deep zone were generally higher in
<br /> comparison to shallow groundwater samples. -i
<br /> TPH-g was detected in all deep groundwater samples. Concentrations ranged between 4,000 pg/L in
<br /> SB-7 to 91,000 pg/Lin SB-3.
<br /> TPH-k was detected in all deep groundwater samples. TPH-k concentrations ranged between 480 pg/L
<br /> from SB-7 to 48,000 pg/L from 8B-3 . However concentrations were of lesser magnitude than TPH-g
<br /> (Table 3). In addition, the lab report indicated that in all samples TPH-k chromatograms did not
<br /> resemble the chromatogram for the TPH-k laboratory standard.
<br /> i _
<br /> Benzene was detected in all sample locations at concentrations ranging between 8. 2 pg/L in SB-5b to _
<br /> 9,400 pg/Lin SB-3 . Toluene, ethylbenzene, and xylenes were etected in SB-2. SB-3 and SB-7.
<br /> Toluene concentrations ranged between 2.3 pg/L in SB-7 to 800 pg/L in SB-J. Ethylbenzene was
<br /> detected in SB-2, SB-3 and SB-7 at 5,700 pg/L, 5,400 pg/L and 2.5 pg/L respectively. i5
<br /> � a niDl 3 ,0 yu} I L rn
<br /> ( ;
<br /> MTBE was only detected in SB-7 at a concentration of 1 .5 pg/L. The remaining fuel oxygenates and
<br /> VOCs including TBA, DIPE, MTBE, ETBE, TAME, 1,2-DCA, EDB, ethanol and methanol were not detected _
<br /> above laboratory reporting limits.
<br /> l_!
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<br /> 25971201 . DGD 6 February 2008
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