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Stantec
<br /> L & M OPERABLE UNIT-THIRD QUARTER 2010 SITE STATUS, REMEDIAL SUMMARY,
<br /> AND GROUNDWATER MONITORING REPORT
<br /> Groundwater Monitoring and Sampling
<br /> October 27, 2010
<br /> SPH removal activities are scheduled to be conducted quarterly (at a minimum) for on and
<br /> offsite wells which repeatedly contain measurable thickness of SPH or sheen. It should be
<br /> noted that these SPH removal activities are typically performed between quarterly monitoring
<br /> events (as noted on the table), and are likely to influence reported SPH thickness.
<br /> 2.7.2.2 Fuel Oxygenates and Hydrocarbon Concentrations
<br /> A summary of third quarter 2010 deep B-, C-, and D-Zone concentration trends of TPHg, TPHd,
<br /> TPHo, benzene, MtBE, and TBA in comparison to results reported during the previous quarter
<br /> are presented in the table below. Values in parentheses represent number of detections and
<br /> non-detects that were reported in the second quarter 2010.
<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-24,MW-26,
<br /> MW-16, MW-29,
<br /> MW-27, MW-32,
<br /> B MW-58 1 (4) MW-42, MW-51, 6(2) 8(7)
<br /> MW-35, MW-44,
<br /> MW-56, MW-59
<br /> MW-57, MW-60
<br /> TPHg
<br /> MW-64, MW-65, MW-61, MW-62,
<br /> C MW-54 1 (2) 3(2) 4(4)
<br /> MW-66 MW-63, MW-67
<br /> MW-68, MW-69,
<br /> D MW-55, MW-70 2(3) MW-71, MW-72 2(l) 4(4)
<br /> MW-73, MW-74
<br /> MW-16, MW-27,
<br /> MW-29, MW-35,
<br /> MW-24, MW-26,
<br /> B MW-57, MW-58 4(8) MW-42, MW-44, 10(5) MW-32 1 (0)
<br /> MW-51, MW-56,
<br /> MW-59, MW-60
<br /> TPHd
<br /> MW-54, MW-62, MW-61, MW-63,
<br /> C MW-64 3(4) MW-65 3(2) MW-66, MW-67 2(2)
<br /> MW-69, MW-70,
<br /> D MW-68 1 (5) MW-71, MW-72, 6(3) MW-55 1 (0)
<br /> MW-73, MW-74
<br /> I:\Tidewater\TW Stockton(Parcel 2A-0415)\Reports\QMR\2010\3010\3010QSSRORSROMR Stockton_FINAL.doc 2.23
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