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AWIAGERS DESIGNERStipi$ULTMT9 <br /> detected at this well in the previous round of sampling (76 µg11 for the second <br /> quarter and 62 µg/l for the third quarter) The concentration of TPH-D in <br />' monitor well MW-3 was significantly lower during the third quarter as compared <br /> to the concentration during the second quarter (690 µg11 for the second quarter <br /> and 61 µg11 for the third quarter) Monitor well MW-3 is 40 feet upgradient of <br />' the former tanks The TPH-D constituents are likely coming from a source <br /> upgradient of the former USTs The 'SPH-D constituents may have been flushed <br /> from the soil by rising groundwater levels during the winter of 1995, which was <br />' unusually wet. <br /> • Benzene was detected in the primary sample collected from upgradient monitor <br />' well MW-3 for the first time. However, benzene was not detected in the <br /> duplicate sample collected from this well <br />' Based on the above summary of results, WESTON recommends <br />' • Groundwater monitoring continue for one additional quarter (fourth quarter 1995) <br /> after which the monitoring program can be re-evaluated to determine if additional <br /> activities at the site are necessary <br /> 1 <br />' L XW0JE,CI'M,"J0Q%TMAII3RU QTR 7 W October 1995 <br />