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Failure of 307 basin transfer line and resultant ground contamination

Description: A leak of apparently long duration was discovered on December 9, 1965, in the transfer line from the 307 retention basins to the 340 contaminated waste system during the transfer of liquid from one of the 307 basins. This line was designed to carry only mildly-contaminated retention system waste. However, the uncovered line suggests that, over a period of time, the bottom half of the carbon steel transition section between the transfer line and the 340 contaminated waste system was corroded out. This permitted the highly contaminated waste to percolate into the soil beneath the missing pipe section. Since neither the duration of leakage nor the exact origin or nature of the contaminants were known, this study was undertaken to: (1) estimate the amount of radioactivity released; (2) document its location with respect to the 340 Area and to the underlying groundwater; and (3) investigate its potential environmental impact. Soil samples were collected to determine the approximate location and quantity of each of the radionuclides which had leaked to the soil. One-digit accuracy was deemed sufficient to decide what, if any, action would be required. The findings from the several exploratory holes drilled at and adjacent to the site of the corroded transfer line are reported. (auth)
Date: January 1, 1970
Creator: Denham, D.H.
Partner: UNT Libraries Government Documents Department

241-T-106 tank leak investigation

Description: On June S, 1973, the 241-T-106 underground liquid waste storage tank, located on the U. S. Atomic Energy Commission's Hanford reservation, was confirmed as leaking. It was predicted that the leaked waste would be retained by the dry sediments well above the water table. A study was instigated to confirm this prediction. Results show the deepest penetration observed was 27 meters below the ground surface or 35 meters above the water table (approximately S7 and 116 feet, respectively). Based on these results and the basic knowledge of liquid movement in Hanford sediments, further movement of the radioactivity from its present location will be negligible. (auth)
Date: November 1, 1973
Partner: UNT Libraries Government Documents Department

Characterization of actinide-bearing sediments underlying liquid waste disposal facilities at Hanford

Description: Past liquid waste disposal practices at the U. S. Energy Research and Development Administration's Hanford Reservation have included the discharges of solutions containing trace quantities of actinides directly into the ground via structures collectively termed ''trenches''. Characterization of samples from two of these trenches, the 216-Z-9 and the 216-Z-1A(a), has been initiated to determine the present form and migration potential of plutonium stored in sediments which received high salt, acidic waste liquids. Analysis of samples acquired by drilling has revealed that the greatest measured concentration of Pu, approximately 10$sup 6$ $mu$Ci $sup 239$Pu/liter of sediment, occurs in both facilities just below the points of release of the waste liquids. This concentration decreases to approximately 10$sup 3$ $mu$Ci $sup 239$Pu/liter of sediment within the first 2 meters of the underlying sediment columns and to approximately 10 $mu$Ci $sup 239$Pu/liter of sediment at the maximum depth sampled (9 meters). Examination of relatively undisturbed sediment cores illustrated two types of Pu occurrence responsible for this distribution. One of these types is composed of Pu particles (greater than 70 wt percent PuO$sub 2$) added to the disposal site in the same form. This ''particulate'' type was ''filtered out'' within the upper 1 meter of the sediment column, accounting for the high concentration of Pu/liter of sediment in this region. The second type of Pu (less than 0.5 wt percent PuO$sub 2$) was originally disposed of as soluble Pu(IV). This ''nonparticulate'' type penetrated deeper within the sediment profile and was deposited in association with silicate hydrolysis of the sediment fragments. (auth)
Date: September 1, 1975
Creator: Price, S.M. & Ames, L.L.
Partner: UNT Libraries Government Documents Department