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1 <br /> ' Ms Margaret Lagono <br /> Page 4 of 6 <br /> Groundwater Sampling Summary and Discussion <br /> • Groundwater elevations decreased during this quarter Well screens in monitoring wells <br /> MW3 through MW12 and vapor wells VW1, VW3 and VW4 remain submerged <br /> ' • TPHg and BTEX were detected in wells MW2, MW7 and MW9 after being at non-detectable <br /> levels during the last 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 MW3 were reported to be at their <br /> highest since sampling began TPHg and benzene increased an order of magnitude in wells <br /> ' MW3, and MW 13 <br /> • Despite increases in some wells this quarter, overall petroleum hydrocarbon concentrations in <br /> ' the momtonng and vapor extraction wells appear to be generally stable <br /> ' • 1,2 DCA was detected in wells MW2 and MW9 after being at non-detectable levels during the <br /> last sampling event <br /> • • In well MW 10, concentrations of 1,2 DCA increased slightly while decreasing in wells MW11 <br /> and MW 12 <br /> • EDB was not detected in monitoring wells NMI through MW 13 or vapor wells VW2 <br /> through VW5 In vapor well VW1, however, EDB was detected for the second time <br /> ' • Monitoring wells MW 1, MW2, MW5, MW6, MW8 and MW 10 through MW 13 had non- <br /> detectable levels for gasoline oxygenate additives <br /> ' • Vapor wells VW 1 through VW6 had non-detectable levels for gasoline oxygenate additives <br /> • MTBE concentrations increased in wells MW3 and MW4 MTBE was detected in well MW4 <br /> ' for the thirteenth consecutive quarter and in well MW3, located downgradient of MW4, for <br /> the eleventh consecutive quarter <br /> TPHg, BTEX and MTBE concentrations in the vicinity and downgradient of the former UST <br /> appear to be generally stable <br /> ' The continual increase of dissolved contanunant levels present in the wells along the southern <br /> boundary appears to be attributed to offsite releases Attachment C contains graphical <br /> ' representations of TPHg vs groundwater elevation and benzene vs groundwater elevation for <br /> wells MW 1 through MW6, MW8 through MW 10 and MW 13 <br /> _klq-14QNUOW <br />