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kn KLEINFELDER 4 CONCLUSIONS AND RECOMMENDATIONS Kleinfelder performed a soil sampling investigation to assess the lateral and vertical extent of fuel oil in the soil as the result of past operation of three aboveground fuel oil tanks. Previous observations indicated that fuel oil was present at the ground surface near the west L, end of the north tank. The presence of the fuel oil near the west end of the north tank was confirmed by boring B-4, which had fuel oil detected to a depth of 6.5 feet. The 11.5 foot sample from boring B-4 did not contain detectable petroleum hydrocarbon concentrations, and the vertical extent of fuel oil migration is anticipated to end between 6.5 and 11.5 feet below the ground surface. Petroleum hydrocarbons were not detected in the remaining seven borings, therefore the lateral extent of fuel oil migration appears to be limited to the area outlined by the soil borings. Kleinfelder did not drill in or beneath the building near the west end of the removed tanks, and it is unknown whether fuel oil migrated to the west beneath the building. Based on the results of the eight soil borings, the volume of fuel oil contaminated soil may V range from 12 to 230 in-place cubic yards. If the fuel oil contamination is localized in the vicinity of B-4, then it is estimated that approximately 12 yards have been impacted. If the `r fuel oil has migrated laterally to the extent of the other borings (25 by 25 feet), then it is estimated that approximately 230 cubic yards of soil have been impacted. The volume range of impacted soil is an estimate based on the eight soil borings. Purgeable TPH and BTEX concentrations were not detected in the contaminated sample from boring B-4, which would confirm that the release was fuel oil and not some other petroleum hydrocarbon such as gasoline. It is Kleinfelder's recommendation that the soil be excavated and that clean soil be used to +-- backfill the excavation to the surface. Kleinfelder has estimated an inplace volume 12 to 230 cubic yards of contaminated soil. The actual volume of contaminated soil will be determined in the field during the soil removal. Backfill operations should be observed to insure proper compaction criteria is obtained. Soil removed from the excavation should be transported to a proper disposal facility. 24-220152-EOO/GR1-01(1993) Page 5 of 7 October 27, 1993 �.. Copyright 1993 KLeinfelder, Inc.