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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 /> 2.7.1.2 Fuel Oxygenates and Petroleum Hydrocarbon Concentrations
<br /> A summary of 3Q11 shallow zone concentration trends of TPHg, TPHd, TPHo, benzene, MtBE,
<br /> and TBA in comparison to results reported during the 2Q11 are presented in the table below.
<br /> Values in parentheses represent number of detections and non-detections that were reported in
<br /> the 2Q11.
<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 /> MW-9, MW-18, MW-25, MW-28,
<br /> TPHg MW-22 1 (0) Mw 20 3(4) MW-30, MW-31, 9(9)
<br /> MW-33, MW-34,
<br /> MW-45
<br /> MW-9, MW-20, MW-22, MW-23, MW-25, MW-28,
<br /> TPHd MW-21, MW-30 4(5) MW-31 3(3) MW-33, MW-34, 5(5)
<br /> MW-45
<br /> MW-18, MW-20,
<br /> MW-22, MW-25,
<br /> TPHo MW-21, MW-23 2(4) MW-9 1 (1) MW-28, MW-30, 10(8)
<br /> MW-31, MW-33,
<br /> MW-34, MW-45
<br /> MW-18, MW-20,
<br /> MW-21, MW-22,
<br /> Benzene 0(i) MW-9 1 (1) MW-23, MW-25, 12(11)
<br /> 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 /> MtBE MW-9 1 (0) -- 0(0) MW-23, MW-25, 12(13)
<br /> 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(i) MW-9 1 (0) MW-23, MW-25, 12(12)
<br /> MW-28, MW-30,
<br /> MW-31, MW-33,
<br /> MW-34, MW-45
<br /> Notes:
<br /> Well 2AMW-12 quarterly comparison was indeterminable during 3Q11 because the well was inaccessible during 2Q11 monitoring and sampling activities.
<br /> TPHd was indeterminable for well MW-18 due to the MRL being increased during 3Q11.
<br /> I:\Tidewater\TW Stockton(P2A)\QMRs\2011\3Q11\3Q11 QSSR QRSR QMR Stockton_FINAL.doc 2.21
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