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Mr Ron Rowe <br /> Page 3 of 5 <br /> concentrations of 23 ppb, 37 ppb and 35 ppb, respectively Oxygenates, EDB, and 1,2 DCA analytical <br /> results are summarized in Table 3 <br /> Vapor Extraction Wells <br /> The potentiometric surface was above the screened interval in wells VWI, VW3 and VW4 <br /> Groundwater samples were collected from vapor wells VW1 through VW6 Petroleum hydrocarbons <br /> were detected all samples collected from the vapor extraction wells Concentrations of TPHg ranged <br /> from 210 ppb to 120,000 ppb in vapor wells VW3 and VW1, respectively Benzene ranged from 0 9 <br /> ppb in well VW3 to 14,000 ppb in well VWl Levels of petroleum hydrocarbons in the vicinity of the <br /> vapor wells appear to generally be stable TPHg and BTEX concentrations are summarized in Table 2 <br /> Samples from vapor extraction wells VW1 through VW6 were also analyzed for gasoline oxygenate <br /> additives, 1,2 DCA and EDB No gasoline oxygenate additives, 1,2 DCA and EDB were detected, <br /> however, MDLs were elevated in some wells due to dilution Oxygenate, 1,2 DCA and EDB <br /> concentrations are summarized in Table 3 <br /> In paired deep/shallow vapor wells VW11VW2 and VW4/VW5, the wells with deeper screened <br /> intervals exhibited higher concentrations of target analytes than the shallower wells <br /> Groundwater Sampling Summary and Discussion <br /> • Groundwater elevations decreased during this quarter Well screens in momtoring wells MW 1 <br /> through MW 12 and vapor wells VW 1,VW3 and VW4 remain submerged <br /> • Well MW2 had non-detectable levels of TPHg and BTEX for the first time since sampling began <br /> MW7 had non-detectable Ievels of TPHg for the third consecutive sampling event, and well MW9 <br /> had non-detectable levels of TPHg and BTEX for the second consecutive sampling event <br /> • Wells MW3, MW4, MW5 and MW13 continue to have significant levels of TPHg and BTEX <br /> constituents TPHg and BTEX concentrations in well MW4 were reported to be at their highest <br /> since sampling began <br /> • Petroleum hydrocarbon concentrations detected in the vapor extraction wells appear to generally be <br /> stable <br /> • Only wells MW10, MW11 and MW12 had detectable levels of 1,2 DCA EDB was not detected <br /> in any site wells <br /> • Wells MW 1, MW2, MW5 through MW8, MW10 through MW 13, and VW1 through VW6 had <br /> non-detectable levels for gasoline oxygenate additives <br /> • <br /> roeklgmA3QM2000 <br /> I <br />