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Starttec <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 /> - 1 „ Number <br /> r 1 Wells,With <br /> - Welts With ,1 Wetly of welts Wdh'^ <br /> J Number 1{ ,Number Stable br Non- <br /> Constituent Zone "Increased Concentrat+ons, . 'Stable or Non. <br /> ' o#Wells i of Wells batectabie <br /> Concentration I 'Decreased - ' Detectat:le_ <br /> concentrations <br /> ' MW-16,MW-24, <br /> MW-26,MW-27, <br /> MW-29,MW-32, <br /> ' <br /> MW-35,MW-42,B — 0(0) -- 0(0) 15(13) <br /> MW-04,MW-51, <br /> MW-56,MW-57, <br /> TBA MW-58,MW-59, <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 /> M <br /> MW-55,MW-70, W-68,MW-69, <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. TPHd 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 TPHd in B-Zone groundwater is delineated to the northwest and <br /> ' 1:\Tide ter\TW Stockton(Parcel PA-0415)\RepMs OMRi201013Q1013Q10QSSRQRSROMR StocktonFINAL.dm 2.2.57 <br />