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Groundwater analysis results, as reported in Table 2, show unexpected changes from previous <br /> results and trends in MW-1, MW-2 and MW-4 <br />' MW-1 shows the return of diesel contamination (previous results showed diesel contamination <br /> decreasing each quarter to ND in June 2001) <br />' MW-2 shows ND for motor oil whereas all recent (since April 2000) analyses showed the <br /> presence of significant levels of motor oil <br />' MW-4 shows diesel contamination (all previous analyses were ND), and nog asoline or BTEX <br />' contamination (all previous analyses showed gasoline and BTEX contamination) <br /> Groundwater elevation, as shown in Figure 5, has trended downward since April 2000 and <br /> reached the lowest levels in the reporting period (December 1999 to November 2001) It is not <br /> clear whether this contributed to the unexpected contamination levels <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 Diesel contamination was detected for the first time <br /> in MW-4 <br /> tMW-4 no longer remains contaminated by gasoline, oxygenates or BTEX <br /> 5.2 Recommendations <br /> El recommends <br /> I <br /> 1 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 /> accumulate data as a basis for future actions <br /> Environeenng,Inc Project No 01-009 012 Page 6 <br />