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Volume= 4.155 tons = 3,777 cu yds <br /> 1.1 tons/cu yd <br /> This volume can be compared to the volume of soil removed from the excavation Using the final <br /> dimensions of the excavation, the calculated volume of excavated soil is <br /> Volume to base of 26-foot floor: 80 ft x 50 ft x 26 ft = 3,852 cu yds <br /> 27 cu ft/cu yd <br /> Volume to base of 35-foot floor: 40 ft a 35 ft a 9 ft= 466 cu yds <br /> 27 eu ft/cu yd <br /> Total: 4,318 cu yds <br /> 7 <br /> This volume is approximately 14% greater than that calculated from tonnage In view of the <br /> uncertainties regarding the dimensions of the excavation and the weight of a cubic yard of soil, the <br /> calculations are probably in reasonable agreement <br /> 8.0 EXCAVATION BACKFILL <br /> The excavation was bacldlled with clean soil delivered by Bob Evans Trucking, supplemented with <br /> uncontaminated soil that had been removed from the ramp areas The soil was dumped, pushed into the <br /> excavation with a front-end loader, and compacted with a CAT 815B Sheep's foot compactor Figure <br /> 9 is a photograph of this procedure Kleinfelder & Associates was retained to perform a compaction <br /> test of the backfiH after the excavation had been brought up to mthm several feet of surface grade A <br /> compaction ratio of 96%was reported by Kleinfelder <br /> 9.0 CONCLUSIONS AND RECOMMENDATIONS <br /> 9.1 Maximum Depth of Contamination <br /> No contaminants were detected by the laboratory in any of the three samples collected from the bottom <br /> of the excavation Bottom sample JL-P-I 1 (ND at 26 feet) and sidewall sample JL-P-13 (9 ppm TPH <br /> t 24 feet) closely constratin limit lower lt of contamination at 25 feet at the south end of the <br /> excavation Both samples were collected from the lower part of unit 5 within 25 feet of the dispenser <br /> island where contamination was first detected to sample JL-P-3 PID readings at this depth ranged from <br /> 13 to 150 ppm in various parts of the excavation <br /> In the northern (deeper) half of the excavation, bottom samples JL-P-7 and JL-P-8, from depths of 3 5 <br /> and 38 feet, also contained no detectable contaminants PID readings on floor and sidewall samples <br />