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Stantec
<br /> L & M OPERABLE UNIT-THIRD QUARTER 2011 SITE STATUS, REMEDIAL SUMMARY,
<br /> AND GROUNDWATER MONITORING REPORT
<br /> Groundwater Monitoring and Sampling
<br /> October 28, 2011
<br /> SPH removal activities are scheduled to be conducted quarterly (at a minimum) for on and off
<br /> Site wells which repeatedly contain measurable thickness of SPH or sheen. It should be noted
<br /> that these SPH removal activities are typically performed between quarterly monitoring events
<br /> (as noted on the table), and may influence reported SPH thickness.
<br /> 2.7.2.2 Fuel Oxygenates and Hydrocarbon Concentrations
<br /> A summary of 3Q11 deep (B-, C-, and D-Zone) concentration trends of TPHg, TPHd, TPHo,
<br /> benzene, MtBE, and TBA in comparison to results reported during the previous quarter are
<br /> presented in the table below. Values in parentheses represent number of detections and
<br /> non-detects that were reported in the 2Q11.
<br /> Number
<br /> Wells With
<br /> Wells With Wells of Wells With
<br /> Number Number Stable or Non-
<br /> Constituent Zone Increased Concentrations Stable or Non-
<br /> of Wells of Wells Detectable
<br /> Concentration Decreased Detectable
<br /> Concentrations
<br /> Concentrations
<br /> MW-16, MW-24,
<br /> MW-26, MW-27,
<br /> MW-29, MW-42, MW-32, MW-35,
<br /> B MW-58 3(l) MW-59 1(3) MW-44, MW-51, 11 (11)
<br /> MW-56, MW-57,
<br /> TPHg
<br /> MW-60
<br /> MW-64, MW-65, MW-61, MW-62,
<br /> c MW-54 1 (0) 3(3) 4(5)
<br /> MW-66 MW-63, MW-67
<br /> MW-70, MW-71, MW-68, MW-69,
<br /> D 3(l) MW-55 1 (3) 4(4)
<br /> MW-72 MW-73, MW-74
<br /> MW-16, MW-27, MW-24, MW-32,
<br /> MW-26, MW-44,
<br /> B MW-57, MW-60 4(3) MW-29, MW-51, 6(4) MW-35, MW-42, 5(8)
<br /> MW-56, MW-59 MW-58
<br /> MW-61, MW-62,
<br /> TPHd C MW-63, MW-65, 5(2) MW-54 1 (3) MW-64, MW-66 2(3)
<br /> MW-67
<br /> MW-55, MW-68,
<br /> MW-69, MW-70,
<br /> D MW-72, MW-73, 7(3) 0(4) 0(1)
<br /> MW-74
<br /> I:\Tidewater\TW Stockton(P2A)\QMRs\2011\3Q11\3011 QSSR QRSR QMR Stockton_FINAL.doc 2.23
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