ML19341B982
| ML19341B982 | |
| Person / Time | |
|---|---|
| Issue date: | 01/30/1981 |
| From: | Scarano R NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Martin J NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| REF-WM-40 NUDOCS 8102280331 | |
| Download: ML19341B982 (4) | |
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UNITED STATES 1,
NUCLEAR REGULATORY COMMISSION q
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WASHINGTON, D. C. 20666
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JAN 3 01981 s
iM-40 MEMORANDUM FOR: John B. Martin, Director Division of Waste Management, NMSS
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FROM:
Ross A. Scarano, Chief Uranium Recovery Licensing Granch
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Division of Waste Management
SUBJECT:
51 Albs REPORT - EDGEMONT CLEANUP (331162)
The NRC has contracted with the Battelle Pacific Northwest Laboratories (PNL) to conduct radiological surveys to determine the extent of usage of uranium mill tailings at off-site properties in the vicinity of Edgemont, South Dakota.
PNL operates a mobile laboratory which fac.ilitates the collection and analysis of grab radon progeny samples (i.e., the Working Level measurement). Al so,
extensive gama radiation surveys, and soil sampling and analysis are being conducted at each property. The need to conduct remedial action (i.e., the cleanup of residual radioactiva materials) will be determined based on standards established by 'the U.S. EPA in 40 CFR 192
" Proposed Cleanup Standards for Inactive Uranium Processing Sites".
The attached table summariz:;s the results of the PNL radiological surveys as of December,1980.
In sum, 40 structures and 6 vacant lots fail to meet the EPA standards due to gama radiation levels greater than 20 uR/hr above background or radium-226 in soil content greater than 5 pCi/g. To date at least 140 structures will require long-tenn radon progeny sampling in order to determine the need for remedial action (i.e., if the annual average working level exceeds 0.015 WL).
Additionally, the U.S. Department of Housing and Urban Development (HUD) has required that grab Working Level sampling be conducted in any structure in Edgemont before federal financial assistance will be approved. The NRC, through its PNL contract, is also conducting these surveys. Results to date indicate that 28 structures fail the HUD criterion of having less than 0.02 Weighted Working Levels (WWL).
The PNL work is progressing well. Radiological surveys have been conducted in 334 structures, but surveys have yet to be completed in the remaining 139 structures where the homeowner / occupant has requested the PNL surveys.
PNL is also preparing to complete engineering assessments at the 46 properties s
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which exceed the EPA standards.
In order to complete this remaining work,.and to conduct the long-term radon. progeny sampling, PNL will continue to keep a: field'teani of 's~cientists in Edgemont for 3,
the remainder of calendar fear T981. ~
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Ross A. Scarano, Chief T 'T -
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Attachment:
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5=r:n Monthly. Report Sumary forl December.1980h- -,,-e$ifMd5 3-et-~r.-CWM.M266 F-i:^.i'sWiW Q-M,;
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Number,of Requests'for, Survey, Received:. 72 473~~'
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N.-.':.'Dec l' 1980 21 (7 d(4)
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Totals:
69 (15) 137 (20) 28(5) 42.RRWL. 58 RR'TO
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II. Vacant Land. Gama Radiation Surveys
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Total Number of Available Lots: 317 Lots + 66 Vacant City Blockst j-Number of Requests for Lot Survey Received: 25 Requests for 121 Lots Sumary Table of NhC/ State Program
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Totals:
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- .L One City. block contains approximately 16 lots.
2 HUD criterion is that the grab Working) Level (WL) times the factor 0.6 equals the Weighted Working Level (WWL which must be less than 0.02 WWL (0.033 WL X 0.6.= 0.02 WL). See the attached flow diagram for the significance of these screening levels. When the verified grab working level measurement is greater than 0.033 WL, the property receives a detailed, engineering assessment to define what remedial action must be taken; otherwise a long-tem monitoring program may be conducted to determine if remedial action is required.
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HUD criterion for: Vacant Landis that the average gammasradiation dose
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