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. f� ) 50 CONCLUSIONS AND RECOMMENDATIONS <br /> M ` 5.9 Conclusions <br />•` C) Groundwater adjacent to the former diesel USTs and the former used oil USTs continues� ues to show <br /> r 1 contamination Diesel contamination no longer exists at MW-2 or MW-3, indicating that the <br />. contamination is generally confined and does not pose a significant threat beyond the site of the <br /> ( ) former USTs <br /> Significant contamination from used oil remains at MW-2, although the levels are trending <br /> �) downward The extent of contamination downstream from this source cannot be determined <br /> } until MW-4 is installed (ref Work Plan dated 1 May 2000 and Work Plan Addendum dated 11 <br /> r May 2000) <br /> J 5.2 Recommendations <br /> r > The floating oil from MW-2 will continue to be removed on a frequent basis, depending on the <br /> 10 C1 rate of re-charge, until it no longer appears This will continue to remove substantial <br /> 1 contamination from the former site of the used oil UST, and facilitate measurement of depth to <br /> `,r <br /> water in MW-2 <br /> } The four groundwater monitoring wells (following installation of MW-4) will continue to be <br /> 1 1 sampled quarterly to develop additional data on contamination levels, groundwater elevation <br /> rr gradients and direction of flow This will show whether contamination levels continue to <br /> } decrease now that the apparent sources of contamination have been removed and help I � ) p define <br /> r � whether any further exploratory work is required <br /> P C } <br /> r c � <br /> r C) <br /> v C) <br /> I1 (h <br />' Environeenng,enc Project No 00-008 OT <br /> I C Page 8 <br /> 1 <br />