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RIB, MW6B and MW7B The flow direction is relatively flat (0 002 ft/linear ft) and to <br /> the northwest <br /> RESULTS OF CERTIFIED ANALYSIS OF GROUNDWATER SAMPLES <br /> MONITOR WELLS <br /> Monitor wells MW 1, MW2, MW3, MW4, and MW5 transverse both the A and B zones <br /> Contaminants found in these wells would mix with the groundwater of both zones <br /> Figure 5A represents the hydrocarbon groundwater plume in the A zone and shows an <br /> elongated plume extending west of MW2 out to "Geoprobe" hole P9 were degradation <br /> has left only minor TPHg(470 ug/L), Toluene (0 65 ug/L) and tert-Butanol (1 I ug/L), the <br /> degradation byproduct of MTBE <br /> Figure 5B represents the hydrocarbon groundwater plume in the B zone and shows a <br /> similar elongated plume extending west from MW2 out to "Geoprobe" hole P9 where <br /> degradation has left only minor amounts of Toluene (0 81 ug/L), Xylenes (0 83 ug/L) <br /> and MTBE(1 6 ug/L) <br /> Figure 6A represents the Benzene groundwater plume in the A zone and shows an <br /> elongated plume extending form the former UST area west past cluster well MW6A <br /> Figure B6 represents the Benzene groundwater plume in the B zone and shows an <br /> elongated plume extending from the eastern edge of the former pump island area to <br /> approximately 20 feet west of monitor well MW6B <br /> Figure 7A represents the MTBE groundwater plume in the A zone, originating from the <br /> UST area near cluster well RIA expands to the west past Cluster well MW6A and to the <br /> north past MW 1 <br /> Figure 713 represents the MTBE groundwater plume in the B zone and shows a similar <br /> plume as indicated in Figure 7A, originating from the UST area near cluster well RIB <br /> expands to the west past "Geoprobe" P9, to the south MW3 and to the north past MW I <br /> Figure 8 illustrates the subsurface lithology and the extent of the A and B zones <br /> groundwater plumes within the A and B zones <br /> RECOMMENDATIONS <br /> 1) One week prior to over-excavating gasoline contaminated soils, place an electric <br /> submersible pump into RIA and pump at 10 gpm Continue pumping during over- <br /> excavation All pumped water will be placed into a 21,000 gallon capacity Baker <br /> s <br /> 6 QM 2ND 2002 <br />