Characterization of ventilation ductwork in building K-31 at the Oak Ridge K-25 Site

摘要

An extensive sampling and analysis program was initiated in mid-August 1992 to characterize the ductwork of Building K-31 at the Oak Ridge K-25 Site. This building, 15 acres under roof, contains approximately 4,000 ft of main exhaust ducts (plenums), not including the side laterals, which are extensive. A large number of hexane-moistened wipe samples were taken from randomly selected locations within the seven main plenums and the side lateral ducts. Some samples were taken from the air-intake ducts as well. Three wipes were taken from each location and were analyzed for polychlorinated biphenyls (PCBs), uranium, and technetium. These samples were augmented with ten metal coupon samples (cut from the ducts) that were analyzed for radionuclides and subjected to Toxicity Characteristic Leaching Procedure analyses for toxic metals, base/neutral/acid compounds, and volatile organic compounds. Based on the wipe analyses (with 95% confidence), 95% of the contamination levels in the ductwork are as follows. PCB levels are