|
Stantec
<br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2010 SITE STATUS,
<br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT
<br /> Groundwater Monitoring and Sampling
<br /> January 31, 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 are likely to influence reported SPH thickness.
<br /> 2.7.2.2 Fuel Oxygenates and Hydrocarbon Concentrations
<br /> A summary of 4Q10 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 3Q10.
<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-29, MW-42, MW-26, MW-27,
<br /> B MW-51, MW-56, 5(l) MW-58 1(6) MW-32, MW-35, 9(8)
<br /> MW-59 MW-44, MW-57,
<br /> TPHg MW-60
<br /> MW-62, MW-63,
<br /> C MW-64, MW-66 4(l) MW-54, MW-65 2(3) MW-61, MW-67 2(4)
<br /> MW-55, MW-70, MW-68, MW-69,
<br /> D 4(2) 0(2) 4(4)
<br /> MW-71, MW-72 MW-73, MW-74
<br /> MW-16, MW-24,
<br /> MW-26, MW-29,
<br /> MW-27, MW-32,
<br /> B MW-51, MW-59 2(4) MW-44, MW-56, 9(10) 4(l)
<br /> MW-35, MW-42
<br /> MW-57, MW-58,
<br /> TPHd MW-60
<br /> MW-61, MW-62, MW-54, MW-65,
<br /> C MW-63, MW-64 4(3) MW-67 3(3) MW-66 1 (2)
<br /> MW-69, MW-70, MW-68, MW-72,
<br /> D MW-71 3(1) MW-73, MW-74 4(6) MW-55 1 (1)
<br /> I:\Tidewater\TW Stockton(Parcel 2A-0415)\Reports\QMR\2010\4010-Annual\4010 and Annual QSSRQRSRQMR Stockton_FINAL.doc 2.21
<br />
|