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SECTIONTWO 51te Background
<br /> generally decreased in groundwater monitoring wells MW--7 and MW-11, slightly
<br /> increased in MW-12, and increased in MW-10
<br /> o Groundwater monitoring was performed in 1994 by Nmyo Moore Groundwater samples
<br /> collected from monitoring wells Mw-10, MW-11, MW-12, MW-13, MW-14, MW 16,
<br /> MW-19, MW-20, and MW-24 were analyzed for TPH g, TPH-d, and 13TEX TPH-g
<br /> concentrations decreased in Mw-10, mw-11, MW-13, slightly increased in MW 14, and
<br /> remained unchanged at below the laboratory detection limits in MW-12, MW-19, and
<br /> MW-20 BTEX concentrations increased inmonitoring wells Mw-10, MVV-14, and Mw-
<br /> 24, generally decreased in MW 11,MVV-13, and MW-16, fluctuated(some concentrations
<br /> slightly increased and some concentrations slightly decreased) in MW-12 and MW-19, and
<br /> remained below detection limits in MW-20 during the groundwater sampling performed in
<br /> 1994
<br /> o In 1994, Nino and Moore abandoned the followin
<br /> Y g monitoring wells due to declining
<br /> water levels MW-1 through MW-8 and MW-10 In addition, eight groundwater
<br /> rmonitoring wells (MW-9, NM-11, MW-13, MW-14, MW-16, MW-19, MW-20, and
<br /> MW-24) were temporarily decommissioned by lowering the top of the well casings due to
<br /> future planned on-site construction activities
<br /> o In 1995
<br /> Geocon performed environmental engmeenmg services that included restoring
<br /> groundwater sampling capability for eight groundwater monitoring wells that were
<br /> temporanly decommissioned A groundwater mom tonng(vapor extraction test well VW-1
<br /> was also installed in 1995 Two vapor extraction test monitoring wells (VM-1 and VM-2)
<br /> and two new groundwater monitoring wells MW-25 and Mw-26 were installed by
<br /> Geocon in 1996 A corrective action plan was prepared(Geocon, 1996)
<br /> 0 Three quarters of groundwater monitoring were performed by Geocon in 1996
<br /> Monitoring wells MW-9, MW 11, MW-12, MW-13, MW-14, MW-16, MW-19, MW-20,
<br /> W-24, and VW-I were sampled for TPH g, TPH d, BTEX, and MTBE Groundwater
<br /> monitoring wells MW-25 and MW-26 were sampled during the last quarter of sampling in
<br /> 1996 Groundwater concentrations of TPH-g, TPH-d, BTEX•, and MTBE generally
<br /> decreased from the first to the third monitoring event in monitoring wells MW-9 and MW-
<br /> 11,
<br /> W11, fluctuated in W-12, MW-13, MW-19, MW-20, and MW-24, and increased in MW-
<br /> 14, and MW-16
<br /> o Groundwater monitoring was performed by Professional Service Industries (PSI) in May,
<br /> September, and December of 1997 Groundwater concentrations of TPH g, TPH-d,
<br /> BTEX and MTBE continued to decrease in monitoring wells mw-9, Mw-11, MW-12,
<br /> MW-13, MVV 14, MW-16, MW-19, MW-20, MW-24, VW-1, MW-25, and Mw-26
<br /> Concentrations of TPH d, toluene, and xylenes fluctuated and concentrations of TPH-g
<br /> and benzene decreased in VM-2
<br /> o Groundwater monitoring was conducted by PSI in March, June and August of 1998 Two
<br /> monitoring wells, VW-1 and MW-26, were abandoned following the collection of
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