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jXC23YXI <br /> MAY 3 1 1995 <br /> ENvRaNMF <br /> PEWITISERV C S S <br /> contaminants since they were installed. Those two wells have <br /> established a "zero', line to the east and south on the property <br /> 5 . PLATE III shows lines of equal concentration of TPH as <br /> gasoline . The size of the plume has been reduced significantly <br /> since the last measurement; MW-2 did not reveal any TPHG from the <br /> 3/23/95 sampling. That has not occurred since the first sampling <br /> in April, 1993 . <br /> 5 . MW-4 & 5 have not recorded any contamination since first <br /> installed in September, 1994 . <br /> COMMENTS . <br /> 1 MW-1 continues to record the highest levels of all tested <br /> substances, although it has been in a downgradient position only <br /> once since monitoring began. MW-3, which is located closest to <br /> the removed UST' s, was downgradient during the latest sampling <br /> event, and should have recorded high levels of BTEX & TPHG Such <br /> was not the case, however, concentrations of all components were <br /> considerably lower than measured in December, 1994 . <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 /> MW-4, in a direct downgradient position, should have measured <br /> gasoline components, it has not done so. <br /> 3 . Based upon the results of data from the 5 monitoring wells, <br /> it appears that additional work is required to define the limits _Y <br /> of the soil & groundwater plume to the north and west It has <br /> been fully defined to the east and south as shown on PLATES II & <br /> III Further work in those directions is not warranted. <br /> RECOMMENDATIONS : <br /> 1 . Put MW-4 & MW-5 on a sem-annual sampling schedule, but ia�L <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 /> 3 Conduct a soil/groundwater investigation to the west and <br /> north of the property to define the limits of contamination in Y/W> <br /> those directions . This proposal was discussed in the last <br /> 2 <br />