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Stantec
<br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2012 SITE STATUS,
<br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT
<br /> Groundwater Monitoring and Sampling
<br /> February 1, 2013
<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-51,
<br /> B MW-42 1 (0) 0(0) MW-57,MW-59, 5(13)
<br /> MW-60
<br /> MW-62,MW-63,
<br /> Benzene C MW-64,MW-66 2(3) MW-54 1 (0) 4(5)
<br /> MW-65,MW-67
<br /> MW-55,MW-68,
<br /> D MW-70,MW-71 2(1) 0(0) MW-69,MW-72, 6(7)
<br /> MW-73,MW-74
<br /> MW-16,MW-42,
<br /> B 0(2) 0(1) MW-51,MW-57, 6(10)
<br /> MW-59,MW-60
<br /> MW-62,MW-63,
<br /> MtBE C 0(2) MW-54,MW-64 2(0) MW-65,MW-66, 5(6)
<br /> MW-67
<br /> MW-68,MW-69,
<br /> MW-70,MW-71,
<br /> D 0(i) MW-55 1 (0) 7(7)
<br /> MW-72,MW-73,
<br /> MW-74
<br /> MW-16,MW-42,
<br /> B 0(0) 0(0) MW-51,MW-57, 6(13)
<br /> MW-59,MW-60
<br /> MW-62,MW-63,
<br /> TBA C MW-64 1 (1) MW-54 1 (0) MW-65,MW-66, 5(7)
<br /> MW-67
<br /> MW-68,MW-69,
<br /> MW-70,MW-71,
<br /> D 0(3) MW-55 1 (0) 7(5)
<br /> MW-72,MW-73,
<br /> MW-74
<br /> Notes:
<br /> B-Zone wells MW-24,MW-26,MW-27,MW-35, MW-44,MW-56,and MW-58 were not sampled during 4Q12 per MRP No.R5-2012-0805.
<br /> C-Zone well MW-61 was not sampled during 4Q12 per MRP No. R5-2012-0805.
<br /> In general, reported TPHg, TPHd, TPHo, benzene, MtBE, and TBA concentrations in samples
<br /> from the deep zone wells were within historical ranges during 4Q12 (Figures 11 through 16 for
<br /> B-Zone, Figures 18 through 23 for C-Zone, and Figures 25 through 30 for D-Zone). TPHg and
<br /> TPHo concentrations in groundwater samples collected from all deep zone wells (B-, C-, and
<br /> D-Zone) generally increased in the majority of wells during 4Q12, and TPHg and TPHo
<br /> I:\Tidewater\TW Stockton(P2A)\QMRs\2012\4Q12-Ann ual\4Q12 and Annual QSSR QRSR QMR Stockton_FINAL.doc 2.17
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