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1 <br /> (southeast of MW-1) in April 2000 This was not evident in later samples until the past quarter <br /> when contamination was detected again in MW-2 Diesel contamination in MW-1 and MW-4 <br /> was also found, indicating that diesel contamination is still affecting groundwater quality (Figure <br /> 5) <br /> MW-4 was installed down gradient from MW-2 to detect possible movement of used motor oil <br /> in the groundwater from the contamination source (former waste oil USTs at MW-2) No oil <br />' was detected in the groundwater at MW-4, indicating that used oil contamination has not spread <br /> down gradient from MW-2 as far as MW-4 However, motor oils were detected in MW-3 <br /> indicating moderate spread of contamination <br /> MW-4 showed contamination from gasoline, oxygenates and BTEX <br /> 1 <br /> 5.2 Recommendations <br /> EI recommends <br />' I Continued removal of floating oil from MW-2 every two to four weeks, depending upon <br /> re-charge rate, until motor oils no longer appear <br /> 2 Continue quarterly monitoring of the four groundwater monitoring wells at CTL to <br /> Iaccumulate data as a basis for future actions <br /> Environeermg,Inc Project No 02-001014 Page 6 <br /> f <br />