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At 1.15 g/ml, 55 gallons of solution weighs 527.85 pounds. At a concentration of 48 percent, the weight of HF in each drum is 253.37 pounds. The aggregate amount of HF, therefore, is 1013.5 pounds (253.37 pounds/drum x 4 drums). The threshold quantity of HF is 1000 pounds. Because the storage of the four drums on a single pallet is considered a single process, a threshold quantity of HF is present.