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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 /> 2.7.1.2 Fuel Oxygenates and Petroleum Hydrocarbon Concentrations
<br /> A summary of 4Q10 shallow zone concentration trends of TPHg, TPHd, TPHo, benzene, MtBE,
<br /> and TBA in comparison to results reported during the 3Q10 are presented in the table below.
<br /> Values in parentheses represent number of detections and non-detections that were reported in
<br /> the 3Q10.
<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-9, MW-21,
<br /> MW-22, MW-23,
<br /> TPH MW-18, MW-20 2 2AMW-12 1 3 MW-25, MW-28, 11 9
<br /> 9 2( ) ( ) MW-30, MW-31, ( )
<br /> MW-33, MW-34,
<br /> MW-45
<br /> MW-9, MW-18, 2AMW-12, MW-25, MW-28,
<br /> TPHd MW-20, MW-21, 6(7) MW-23, MW-31 3(2) MW-33, MW-34, 5(4)
<br /> MW-22, MW-30 MW-45
<br /> MW-18, MW-20,
<br /> 2AMW-12, MW-21, MW-25,
<br /> TPHo MW-9 1 (1) MW-22, MW-23, 4(3) MW-28, MW-30, 9(10)
<br /> MW-31 MW-33, MW-34,
<br /> MW-45
<br /> 2AMW-12,
<br /> MW-18, MW-20,
<br /> MW-21, MW-22,
<br /> Benzene 0(0) MW-9 1 (2) MW-23, MW-25, 13(12)
<br /> MW-28, MW-30,
<br /> MW-31, MW-33,
<br /> MW-34, MW-45
<br /> 2AMW-12
<br /> MW-18, MW-21,
<br /> MtBE MW-23 1 (3) MW-9, MW-20 2(0) MW-22, MW-25, 11 (11)
<br /> MW-28, MW-30,
<br /> MW-31, MW-33,
<br /> MW-34, MW-45
<br /> MW-18, MW-20,
<br /> MW-22, MW-23,
<br /> TBA 2AMW-12, 2(0) MW-9 1 (2) MW-25, MW-28, 11 (12)
<br /> MW-21 MW-30, MW-31,
<br /> MW-33, MW-34,
<br /> MW-45
<br /> I:\Tidewater\TW Stockton(Parcel 2A-0415)\Reports\QMR\2010\4010-Annual\4Q10 and Annual OSSRQRSRQMR Stockton_FINAL.doc 2.19
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