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i unknown at this time 4.2 Waste Oil USTs Analysis of MW-2 sampled on 1 February 2003 showed no contamination from MTBE although ' TPH-gasoline appeared again MW-2 continues to show contamination from motor oils as reflected in the amount of floating oil removed during the past quarter and the analytical results The level of oil contamination has dropped significantly, continuously from 2001 MW-1, MW- 3 and MW-4 continue to remain free of motor oils contamination 4.3 Diesel USTs ' MW-1 (site of the former diesel USTs) continued to show contamination from diesel although it has decreased slightly The TPH-diesel contamination level, as shown in Figure 5, dropped to I J')riv�ry ND in June 2001, peeked at 72 Se ppm in pt—�1 and has continued to decrease since then '5l g"1 f1 c& VHI Contamination from THP-gasoline increased slightly this quarter " "16 ' Diesel contamination continues to appear in MW-2 MW-4 and MW-3 continued to show no I • diesel contamination The reversal of trends over the past 3 years may have resulted from the extreme changes in Igroundwater elevation (Figure 4), a 7 ft drop from April 2000 to September 2001, a 4 foot increase to March 2002, 4-foot drop to September 2002 and a 1 foot increase this quarter 4.4 Floating Oil A September 1998 sample of groundwater monitoring well MW? found black, floating oil that I appeared to be typical of used motor oil Floating oil has been removed from MW-2, using disposable bailers and absorbent socks, periodically since that time Approximately 17 3 gallons Iof floating oil have been removed through 1 February 2003 (Table 3) 4.5 Groundwater Flow The groundwater direction of flow for the area was inferred to be easterly from MW-1 to MW=3 Iat a gradient of 0 02 ft/ft, southerly from MW-2 to MW-3 at a gradient of 0 003 ft/ft and i Enwroneenng,Inc Prosect No 03 00218 Page 5 I