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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 /> 2.7.1.2 Fuel Oxygenates and Petroleum Hydrocarbon Concentrations
<br /> A summary of third quarter 2010 shallow zone concentration trends of TPHg, TPHd, TPHo,
<br /> benzene, MtBE, and TBA in comparison to results reported during the second quarter 2010 are
<br /> 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 Number Wells With Number
<br /> Wells Wells of Wells With
<br /> of Wells of Wells Stable or Non-
<br /> Constituent Concentrations Concentrations Stable or
<br /> Concentrations Concentrations Detectable
<br /> Increased Increased Decreased Decreased Concentrations Non-Detectable
<br /> Concentrations
<br /> MW-21, MW-23,
<br /> 2AMW-12, MW-9, MW-18, MW-25, MW-28,
<br /> TPHg MW-22 2(3) MW-20 3(2) MW-30, MW-31, 9(7)
<br /> MW-33, MW-34,
<br /> MW-45
<br /> MW-9,2AMW-12,
<br /> TPHd MW-20, MW-22, 7(5) MW-21, MW-45 2(3) MW-25, MW-28, 4(3)
<br /> MW-23, MW-30, MW-33, MW-34
<br /> MW-31
<br /> MW-9, MW-18,
<br /> 2AMW-12, MW-20, MW-21,
<br /> TPHo MW-31 1 (5) MW-22,MW-23 3(1) MW-25, MW-28, 10(6)
<br /> MW-30, MW-33,
<br /> MW-34, MW-45
<br /> 2AMW-12,
<br /> MW-20, MW-21,
<br /> MW-22, MW-23,
<br /> Benzene 0(i) MW-9, MW-18 2(1) MW-25, MW-28, 12(10)
<br /> MW-30, MW-31,
<br /> MW-33, MW-34,
<br /> MW-45
<br /> 2AMW-12
<br /> MW-18, MW-21,
<br /> MtBE MW-9, MW-20, 3(0) 0(2) MW-22, MW-25, 11 (10)
<br /> MW-23 MW-28, MW-30,
<br /> MW-31, MW-33,
<br /> MW-34, MW-45
<br /> MW-18, MW-20,
<br /> MW-21, MW-22,
<br /> TBA 0(2) MW-9,2AMW-12 2(0) MW-23, MW-25, 12(10)
<br /> MW-28, MW-30,
<br /> MW-31, MW-33,
<br /> MW-34, MW-45
<br /> Notes:
<br /> The RDA did not sample during 31010
<br /> Results indeterminable for TPHd in well MW-18 due to increase in method reporting limit.
<br /> I:\Tidewater\TW Stockton(Parcel 2A-0415)\Reports\QMR\2010\3010\3010QSSRORSROMR Stockton_FINAL.doc 2.21
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