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r 2Detection limits for analyses on this sample were 0 0005 ppm 3Detection limits for analyses on this sample were 0 01 ppm ND=Not detected at or above the indicated laboratory detection limit NA= Sample was not analyzed 4.5 Groundwater Elevations Table 5. Groundwater-Elevations Sample Elevation of toc Measured 22 Dec 99 Measured 27 Jan 00 ID (ft above MSL) Depth to Elevation (ft. below Depth to Elevation (ft. below Water MSL) Water MSL) MW-1 1302 2992 1690 2870 1568 MW-3 1261 3040 1779 L 28 60 1 1599 50 CONCLUSIONS AND RECOMMENDATIONS 5.1 Conclusions The vertical extent of contamination at this site has been defined All three borings showed no contamination at 50 ft bgs The analytical results indicate contamination of the soil in the area from which the diesel USTs were removed in 1998 This contamination appears to have spread laterally in a northeasterly direction, as evidenced by moderate levels of TPH-diesel in B-5, at and below the current level of groundwater Low concentrations of toluene and total xylenes were detected in the soil sample collected at 35 feet in MW-3 Groundwater samples from both MW-1 and MW-3 evidenced diesel contamination, leading to the conclusion that the former diesel USTs released a quantity of diesel fuel into the soil, some of which reached the groundwater This contamination appears to have Impacted soil as much as 70 feet from the source Groundwater contamination probably extends further, but additional information is needed to define this extent EI was unable to determine depth to groundwater at MW-2 or to secure a groundwater sample for analysis due to the presence of a heavy layer of black oil (presumably used motor oil) on the surface of the water This prevented EI from determining the direction of groundwater flow by triangulation Efftoneering,Inc. project No 99.01202 11