ML20042B009
| ML20042B009 | |
| Person / Time | |
|---|---|
| Site: | 02700039 |
| Issue date: | 03/09/1982 |
| From: | Siefken D NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML20042B004 | List: |
| References | |
| NUDOCS 8203240390 | |
| Download: ML20042B009 (7) | |
Text
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NOTES OF MEETING ON 0FF-SITE TRITIUM MIGRATION AT SHEFFIELD SITE DATE:
February 11, 1982 PLACE:
Chicago, Illinois ATTENDEES:
Marty Schumacker NRC, Region III David Siefken.
NRC, WMLL Clifford Weaver Ross, Hardies, O'Keefe, Babcock and Parsons Susan Harmon Phillip Gustafson Illinois Department of Nuclear Safety James Blackburn David Ed Melanie Hamel Barbara Chasnoff Office of Attorney General, State of Illinois Howard Chinn Tom Borecki Donald Etchison Office of Governor, State of Illinois Thomas Johnson Illinois State Geological Survey James Foster U.S. Geological Survey, Champaign District PURPOSE:
The purpose of the meeting was to have a technical discussion on the cause, extent and significance of off-site tritium migration at the Sheffield site.
The tritium was found by the U.S. Geological Survey in December and January water samples collected from wells 563 and 575. These data were confirmed by the Illinois Department of Nuclear Safety and NRC-Region III in water samples collected February 8 and 9,1982, respectively.
DISCUSSION:
I began the meeting by explaining the work being performed by the U.S. Geological Survey under interagency agreement with the NRC. This study has consisted to-date of drilling 17 observation wells to the east of the Sheffield site in order to determine the location and rate of ground-water discharge from the water-table aquifer underlying the Sheffield site.
The USGS sampled water from several of the wells closest to the Sheffield site during and after drilling, and, they detected tritium in two wells, numbers 563 and 575 (see Exhibit 1).
0203240390 820309 PDR ADOCK O2700039
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- Buck Foster of the USGS then provided a detailed description of what has been learned to-date with respect to ground-water flow and geology (particulary the presence of the sand unit within the glacial deposits) to the east of the site.
The thickness of the sand unit is shown in Exhibit 2 and the elevation of the top of the sand unit is shown in Exhibit 3.
Ground-water flow to the east of the site is generally as anticipated from previous studies on the site. The sand unit generally becomes clearer, coarser, and thicker to the east of the site and this may result in an increased ground-water velocity. However, the preliminary potentiometric surface map (Exhibit 4) shows a reduced hydraulic gradient to the east of the site and this could have the effect of decreasing the ground-water velocity. Additional studies, including aquifer pumping tests and borehole dilution tracer tests, are planned under the NRC-USGS interagency agreement to measure directly the ground-water velocity and parameters which govern it.
The discussion then centered on measured tritium concentrations in the off-site wells and a few selected on-site wells. These data are summarized in the attached Table 1.
It was noted that on-site well number 523 was not sampled since the bailer chain broke and the bailer is at the bottom of the well.
The remainder of the meeting consisted of a wide-ranging discussion of the significance of the tritium migration, namely the first observed migration outside the fenced perimeter around the site and the apparent inability of the on-site monitoring program to detect the migration.
The discussion also included consideration of what studies could be performed to define the extent, concentration, and source of the tritium migration, Possible sources, including both slug-type and continuous release mechanisms, were considered.
The State of Illinois indicated that as a result of the off-site migration of tritium, they will seek an agreement with U.S. Ecology to fund (1) necessary monitoring to define the extent, concentration and source of the tritium migration; (2) a study of available remedial actions if the monitoring indicates they may be needed; and (3) access to the area east of the site to perform the monitoring without interference.
If an agreement cannot be reached with U.S. Ecology, the State indicated they would request in state court that these three items be added to the existing injunction against U.S. Ecology.
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