Laserfiche WebLink
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 and a 4 foot increase since then <br /> 4.4 Floating Oil <br /> A September 1998 sample of groundwater from monitoring well MW-2 found black, floating oil <br /> that 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 14 4 gallons of floating oil have <br /> Ibeen removed through 21 March 2002 (Table 3) <br /> r <br /> 45 Groundwater Flow <br /> The groundwater direction of flow for the area was inferred to be easterly at a gradient of 0 001 <br /> 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 />� . sigruficant ranges (up to 5 feet in 9 months), which will affect contamination levels, flow <br /> direction, etc <br /> 50 CONCLUSIONS AND RECOMMENDATIONS <br /> 5.1 Conclusions <br /> The former waste oil USTs caused significant contamination of the soil and groundwater <br /> immediately 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 <br /> continues to appear in MW-3 <br /> IThe 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 /> (southeast of MW-1) in April 2000 This was not evident in later samples until December 2001 <br /> when diesel contamination was detected again in MW-2 Diesel contamination also appeared in <br /> Environeering,Inc Project No 02 004 15 Page 6 <br /> I <br />