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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 /> 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-26, MW-27, <br /> MW-29, MW-32, <br /> MW-35, MW-42, <br /> B 0(0) 0(0) 15(13) <br /> MW-44, MW-51, <br /> MW-56, MW-57, <br /> MW-58, MW-59, <br /> TBA <br /> MW-60 <br /> MW-54, MW-61, <br /> c MW-64 1 (2) MW-63 1 (1) MW-62, MW-65, 6(5) <br /> MW-66, MW-67 <br /> MW-68, MW-69, <br /> MW-55, MW-70, <br /> D MW-71 3(2) 0(1) MW-72, MW-73, 5(5) <br /> MW-74 <br /> Notes: <br /> Results indeterminable for TPHd in well MW-63 due to increase in method reporting limit. <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 the third quarter 2010. TPHg and <br /> MtBE concentrations in groundwater samples collected from C and D-Zone wells during 3Q10 <br /> generally remained stable and were consistent with historical data. TPHo and benzene <br /> concentrations in groundwater samples collected from D-Zone wells during 3Q10 generally <br /> remained stable and were consistent with historical data. TBA concentrations in groundwater <br /> samples collected from B and C-Zone wells during 3Q10 generally remained stable and were <br /> consistent with historical data. TPI-Id concentrations in groundwater samples collected from all <br /> deep zone wells generally decreased during 3Q10. TPHg and TPHo concentrations in <br /> groundwater samples collected from B-Zone wells generally decreased during 3Q10. TPHo and <br /> benzene concentrations in groundwater samples collected from C-Zone wells generally <br /> decreased during 3Q10. Benzene and MtBE concentrations in groundwater samples collected <br /> from B-Zone wells generally increased during 3Q10. TBA concentrations in groundwater <br /> samples collected from D-Zone wells generally increased during 3Q10 <br /> Dissolved TPHg, TPHo, and MtBE are located in two separate sections of the site (north and <br /> south) in B-Zone groundwater. In the northern section of the site, dissolved TPHg and TPHo <br /> are delineated to the south and west. MtBE is delineated except to the east. In the southern <br /> section of the site, TPHo is delineated and TPHg and MtBE are delineated to the northwest, <br /> north, and east. Dissolved TPI-Id in B-Zone groundwater is delineated to the northwest and <br /> I:\Tidewater\TW Stockton(Parcel 2A-0415)\Reports\QMR\2010\3010\3010QSSRORSROMR Stockton_FINAL.doc 2.25 <br />