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i <br /> those measured in March, 1995, and MW-2 was below detection <br /> i <br /> limits <br /> 5 PLATE III shows lanes of equal concentration of TPH as <br /> gasoline It too shows a shift to the northwest TPH-G has not <br /> been detected in MW-2 since the December, 1994 sampling event <br /> 6 . MW-4 & 5 have not recorded any contamination since first <br /> installed an September, 1994 <br /> COMMENTS <br /> 1 MW-1 continues to record the highest levels of all tested <br /> substances, although at has been an a downgradient position only <br /> once since monitoring began MW-3 , which as located closest to <br /> the removed UST' s, has shown varying levels of BTEX & TPH-G, but <br /> there does not appear to be a direct correlation between concen- <br /> trations measured and gradient direction <br /> 2 Even though there is no direct evidence of an offsite source, <br /> the data obtained to date continues to indicate its' existence <br /> The two recently completed monitoring wells have defined the <br /> limits of both soil and groundwater plume to the east & south <br /> BTEX & THP-G were below detection limits an MW-2 during the <br /> latest sampling event, confirming the shift in the zero line to <br /> the northwest <br /> RECOMMENDATIONS <br /> 1 Put MW-4 & MW-5 on a sem-annual sampling schedule, but <br /> determine water levels quarterly <br /> 2 MW-1, 2, & 3 should continue to be monitored quarterly <br /> pending the results of further work <br /> i <br /> 3 Further work will depend upon the results of the offsite soil <br /> & groundwater investigation which as in the planning stages A <br /> program to accomplish that work has been submitted to the San <br /> Joa n C EHD staff for review & approval <br /> Wm unter & Associates 0 6fQ�0��� <br /> c Sanchez <br /> VRWQCB WI�L�A!�i1 �iU�ifER <br /> No 669 <br /> • srq�OF CA�� <br /> 2 <br />