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in MW-2 as well as MW-4 <br /> The reversal of trends shown in this, and the prior quarter sampling, may have resulted from the <br /> extreme changes in groundwater elevation (Figure 4), a 7 ft drop from April 2000 to September <br /> 2001 <br /> 4 4 Floating Oil <br />' A September 1998 sample of groundwater monitoring well MW-2 found black, floating oil that <br /> appeared to be typical of used motor oil Floating oil has been removed from MW-2, using <br /> disposable bailers, periodically since that time Approximately 13 5 gallons of floating oil have <br /> been removed through 27 December 2001 (Table 3) <br /> 4.5 Groundwater Flow <br /> The groundwater direction of flow for the area was inferred to be curving toward the southeast at <br />' a gradient of 0 0028 ft/ft (Figure 3) <br /> The flow gradient decreased slightly from the previous quarter <br /> Figure 4 shows groundwater elevations at various dates Elevations fluctuate over very <br />' significant ranges (up to 5 feet in 9 months), which will affect contamination levels, flow <br /> direction, etc <br />' 50 CONCLUSIONS AND RECOMMENDATIONS <br /> 51 Conclusions <br /> The former waste oil USTs caused significant contamination of the soil and groundwater <br /> Mimmediately adjacent to the tanks Substantial quantities of oil have been removed from MW-2, <br /> however, some contamination remains Although the used oil appears to move very slowly <br /> through the soil and in relatively close proximity to the former USTs location, contamination has <br /> now apparently reached MW-3 <br /> The former diesel USTs caused moderate contamination of the soil and groundwater adjacent to <br /> the tanks Diesel contamination was detected in MW-2 (northeast of MW-1) and MW-3 <br /> • <br /> 1 <br /> Environeering,Inc Project No 02-001014 Page 6 <br />