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13 September 2012
<br /> AGE-NC Project No.99-0682
<br /> Page 13 of 17
<br /> • TPH-d were detected in the samples collected from wells MW-1A, MW-7, MW-8
<br /> and MW-10 at concentrations between 3,500 pg/I(MW-10)and 16,000 pg/I(MW-8).
<br /> • One or more BTEX compound were detected in samples collected from MW-1A,
<br /> MW-6, MW-7, MW-8 and MW-10 at maximum concentrations of 3,400 pg/1
<br /> benzene, 13,000 pg/I toluene, 1,700 pg/I ethylbenzene and 17,800 pg/I total xylenes
<br /> (MW-8).
<br /> • TAME was detected in samples collected from wells MW-7, MW-8 and MW-10 at
<br /> a concentrations of 16 pg/l, 9.7 pg/I and 4.5 pg/I.
<br /> • 1,2-DCA was detected in the samples collected from wells MW-7 and MW-8 at
<br /> concentrations of 13 pg/I and 91 pg/I, respectively.
<br /> • Various metals were detected in samples collected from wells MW-1A, MW-6,
<br /> MW-7, MW-8, and MW-10; Fe and Al concentrations in well MW-8 remain above
<br /> baseline concentrations but have decreased compared to the previous sampling
<br /> event on 28 June 2012; Fe concentrations in MW-1A remain below baseline
<br /> concentrations. CrVI, Cr,and Cu were not detected above laboratory reporting limits
<br /> in the samples collected (Table 4).
<br /> • Anions (bromate, bromide, chloride, nitrate, nitrate as nitrogen, nitrate as NO3-,
<br /> sulfate, ammonia, and TDS) were detected in the samples collected from wells
<br /> MW-1 A,MW-6, MW-7, MW-8 and MW-10,with the exception of ammonia from wells
<br /> MW-1 A, MW-2, MW-7, MW-8 and MW-10. Concentrations of bromate and bromide
<br /> continue to be detected near or below baseline concentrations in wells MW-1 A and
<br /> MW-8. Concentrations of bromate and bromide decreased to below baseline levels
<br /> in well MW-6; and remain just above baseline concentrations in well MW-7.
<br /> Additionally, concentrations of chloride and nitrates remain above baseline
<br /> concentrations in samples collected from well MW-8 (Table 5).
<br /> 4.2.6. Post-ISCO Monitoring Event No. 3: Analytical Results
<br /> On 12 July 2012, post-ISCO groundwater samples were collected from wells MW-1A, MW-
<br /> 2, MW-6, MW-7, MW-8 and MW-10 to evaluate the effectiveness of the ISCO pilot test.
<br /> The following is a summary of the results:
<br /> • TPH-g were detected in the samples collected from wells MW-1A, MW-6, MW-7,
<br /> MW-8 and MW-10 at concentrations between 300 pg/I (MW-6) pg/I and
<br /> 120,000 pg/l (MW-8).
<br /> • TPH-d were detected in the samples collected from wells MW-1A, MW-7, MW-8
<br /> Advanced GeoEnvironmen[al,Inc.
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