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8820101-R COT-9 • contamination was MW1-45 taken at a depth of 46 feet in Boring MW-1. Only moderate to low levels of benzene and xylene were found in that sample. Groundwater Contamination No free product or sheen were detected in Wells MW-1 and MW-2, while MW-3- did not contain enough water to collect' a sample: As shown in Table 1, + ' Well MW-1 contained significant levels of contamination at 92 mg/1 (ppm) _ TPH and 15.0, 18.4; 5.0 and 43.8 ppm BTEX, respectively. Well MW-2 was also found to be contaminated with 12.2 ppm TPH and�:9.7, 0.4, 0.6 and 1.6 ppm BTEX. No lead was Aetected in either well sample, while only Well MW-1 was found to contain detectable EDB at .0.012-'ppm.. The .state action levels 1 for BTEX are 0.0007, .0.1, 0.68 and 0.62 ppm, respectively. As shown- in Table 1, all action levels have been exceeded in Well MV-1 and partially texceeded in MW=2. CONCLUSIONS ' It is apparent from the results of' this' investigation that varying degrees of hydrocarbon contamination are -- resent in both the soil and groundwater Y P at the site. Based on field observation and analytical testing for both this and the previous assessment conducted by Hydrotech, the apparent source of the contamination is located near the southeast corner of the storage tank cluster. The majority of the soil contamination appears to be above 40 feet to depth, although the contamination.An'the sample at 46feet in Boring MW-2 would indicate that low levels of contamination did extend to_ the groundwater at that-location.. The presence of high levels of groundwater contamination i-n MW-1 and moderate levels 1n MW-2 would suggest that significant levels of hydrocarbons extended to groundwater somewhere to the vicinity of the wells. It is assumed that the actual -source is or.was centered beneath one of the tanks in the east portion of the tank cluster, and the soil . 12 }L