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5.0 CONCLUSIONS AND RECOMMENDATIONS . 5.1 Conclusions Groundwater samples from all three groundwater monitoring wells evidenced diesel contamination, leading to the conclusion that the former diesel USTs released a quantity of diesel fuel into the soil that continues to reach the groundwater This contamination appears to have impacted the groundwater as much as 60 feet from the source Groundwater contamination that extends further will be defined according to the Work Plan dated 11 May 2000 The groundwater samples taken from the three groundwater monitoring wells also indicate petroleum hydrocarbons contamination in MW-2 This contamination remained relatively constant since the sampling in 1997 The ethyl benzene and total xylenes contamination in MW- 1 has also remained constant since the sampling in 22 Dec 2000 The vertical and lateral extent of petroleum hydrocarbons contamination from the former used oil UST will be further defined by the work outlined in the Work Plan dated 11 May 2000 5.2 Recommendations The floating oil from MW-2 will continue to be removed on a frequent basis, depending on the rate of re-charge, until it no longer appears This will continue to remove substantial contamination from the former site of the used oil UST, and facilitate measurement of depth to water in MW-2 The three groundwater monitoring wells will continue to be sampled quarterly to develop additional data on contamination levels, groundwater elevation gradients and direction of flow This will show whether contamination levels continue to decrease now that the apparent sources of contamination have been removed, and help define whether any further exploratory work is required Environeering,inc. Prosect No 00-005 06 Page 7