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4.2 Waste Oil USTs <br /> Analysis of MW-2 sampled on 21 November 2000 shows increased contamination from motor <br /> oil and gasoline No diesel contamination was present in the 21 November 2000 sampling of <br /> MW-2 The former waste oil USTs continue to be an apparent source of groundwater <br /> contammation from a number of petroleum hydrocarbons <br /> 4.3 Diesel USTs <br /> MW-1 (site of the former diesel USTs) continues to show contammation from diesel, ethyl <br /> benzene and total xylenes The contarrunation levels are decreasing significantly, as shown in <br />• Figure 5 <br /> MW-2 is now free of diesel contamination, and MW-3 shows no contamination from any <br /> targeted hydrocarbons At this time, it appears that contamination from diesel is generally <br /> confined to the location of the former diesel USTs, and does not pose a significant threat to <br /> groundwater downstream <br /> 4.4 Floating Oil <br />. A September 1998 sample of groundwater monitoring well MW-2 found black, floating oil that <br /> r appeared to be typical of used motor oil Floating oil has been removed from MW-2 using <br />! disposable bailers periodically throughout the year Approximately 8 25 gallons of floating oil <br /> S has been removed through 21 November 2000 <br /> 4.5 Groundwater Flow <br />• Groundwater flow direction is southeasterly It appears to turn easterly near the south and east <br />. property boundaries (Figure 3) <br />• The flow gradient is substantially higher than previous estimate, with the inclusion of MW-4 <br /> Figure 4 shows groundwater elevations at various dates during 1999 and 2000 Elevations <br /> fluctuate over very significant ranges (3 and 4 feet in 3 to 4 months), which will affect <br /> contamination levels, flow direction, etc It should be noted that the groundwater elevation for <br /> i MW-2 in November 2000 is suppressed due to the effect of excess floating oil, which interfered <br /> 30 <br /> ID <br /> Environeenng,Inc Project No 01-00109 Page 9 <br />