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B ZONE Monitor wells MWI, MW2, MW3, MW4, MW5 penetrate both the A and B zones Figure 4B show the gradient determination for the B Zone utilizing only the cluster wells RIB, MWO and MW7B The flow direction is relatively flat (0 002 ft/linear ft) and to the northwest RESULTS OF CERTIFIED ANALYSIS OF GROUNDWATER SAMPLES MONITOR WELLS Monitor wells MW l, MW2, MM3, MW4, and MW 5 transverse both the A and B zones Contaminants found in these wells would mix with the groundwater of both zones Figure 5A represents the hydrocarbon groundwater plume in the A zone and shows an elongated plume extending west of MW2 out to "Geoprobe" hole P9 were degradation has left only minor TPHg(470 ug/L), Toluene(0 65 ug/L) and tent-Butanol (I I ug/L), the degradation byproduct of MTBE Figure 5B represents the hydrocarbon groundwater plume in the B zone and shows a similar elongated plume extending west from MW2 out to "Geoprobe" hole P9 where degradation has left only minor amounts of Toluene (0 81 ug/L), Xylenes (0 83 ug/L) and MTBE (l 6 ug/L) Figure 6A represents the Benzene groundwater plume in the A zone and shows an elongated plume extending form the former LIST area west past cluster well MW6A Figure B6 represents the Benzene groundwater plume in the B zone and shows an elongated plume extending from the eastern edge of the former pump island area to approximately 20 feet west of monitor well MW613 Figure 7A represents the MTBE groundwater plume in the A zone, originating from the UST area near cluster well RIA expands to the west past Cluster well MW6A and to the north past MW 1 Figure 7B represents the MTBE groundwater plume in the B zone and shows a similar plume as indicated in Figure 7A, originating from the UST area near cluster well RIB expands to the west past"Geoprobe" P9, to the south MW3 and to the north past MW 1 Figure 8 illustrates the subsurface lithology and the extent of the A and B zones groundwater plumes within the A and B zones 6 QM 3rd 2002