Document Details

Progress Report of Disposal Area Studies at Oak Ridge National Laboratory: Period of October 1, 1975 to September 30, 1977
Subject Terms:
SWDA, Co-60, Sr-90; Strontium-90, Cobalt-60; hydrology, tritium, halocarbon; progress report, disposal; studies, ORNL, environment
Document Location:
DOE INFORMATION CENTER 1 Way, Oak Ridge, TN 37831; Eva Butler; Phone: 865-241-4780; Toll-Free: 800-382-6938, Option 6; FAX: 865-574-3521; Email:
Document Categories:
Health, Safety and Environment\Waste Management
Document Type:
Publication Date:
1980 Jan 31
Declassification Status:
Never classified
Document Pages:
Accession Number:
Document Number(s):
ORNL-5514, 000497; WAG 5, UC-70; Pub. No. 1286; WAG5UC70; PubNo1286
Originating Research Org.:
Union Carbide Corporation
OpenNet Entry Date:
1998 Jun 16
This document contains a progress report of disposal area studies at Oak Ridge National Laboratory from the period October 1, 1975 to September 30, 1977. Activities were undertaken to further understand or correct the release of radioactivity to the White Oak Creek watershed from burial grounds and other waste management facilities. Investigation of Co-60 migration from trenches 5 and 7 and pit 4 showed that between 90 and 95 percent of Co-60 is mobilized by the tetramethyl ester of EDTA, which is a common decontamination-process substance. Results from a kinetics study indicate Co-60 is taken up by either insoluble organics, iron, or manganese oxides. The observed manganese oxide-cobalt association was the greatest of the three, with a correlation of greater than 0.95. Estimations of annual Sr-90 discharge into White Oak Creek from Solid Waste Disposal Area (SWDA) 4 were made using the difference between annual precipitation and evapotranspiration. Another method, stream-monitoring, gave higher values of Sr-90 discharge. Possibly, the discrepency was due to a malfunctioning monitoring station. However, unaccounted sources such as SWDA's 1 and 3, contaminated soils on the flood plain of the creek adjacent to SWDA 4, and along the creek channel above SWDA 4 may also have been responsible for the discrepency. Further study of these possible sources is necessary. Corrective methods employed were: a surface diversion system in SWDA 4; the sealing of several trenches in SWDA 5; and the emplacement of bentonite surface seals in designated areas of the SWDAs. A new technique for tracing ground-water movement and dating ground-water using halocarbons was developed and tested. Three tests were run in areas of well-known hydrology using tritium as a standard. In the first test the halocarbon did not indicate the presence of younger water at depth. However, in the other two the correlation between the halocarbon and tritium was good. The presence of a fault-zone was indicated by the halocarbon in one test. A final, practical test was carried out in the ground-water adjacent to SWDA 6. Good results were again obtained indicating the technique is viable and should be further developed. Figures and tables are included.

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