ML20043F985
| ML20043F985 | |
| Person / Time | |
|---|---|
| Issue date: | 06/01/1990 |
| From: | Michaud P NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| Shared Package | |
| ML20043F984 | List: |
| References | |
| REF-WM-39 NUDOCS 9006180385 | |
| Download: ML20043F985 (3) | |
Text
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NUCLEAR REGULATORY COMMISSION RE0lON IV URf 6' lum RECoy PIELD OFFICE.
DENVER, COLORADO 80335 AN - l 1990 URFO:PWM Docket No. WM-39 040WM039390E MEMORANDUM FOR:
Docket File No. WM-39 FROM:
Paul W. Michaud' 1
ProjectManager
SUBJECT:
APPLICATION OF SUPPLEMENTAL STANDARDS AT VICINITY PROPERTY GJ-97011-0T
Background
i (he Radiological and Engineering Assessment (REA) for vicinity property GJ-97011-0T was submitted to the NRC on July 7, 1989, by the Department of
)
Energy (00E), in which NRC concurrence on the application of supplemental standards was requested.
Discussion This property is a strip of land approximately 12-feet wide adjacent to-the I-70B frontage road and 28 road in Grand Junction, Colorado.
The REA focuses on contaminated mill tailings which were apparently used as bedding and backfill for a 24-inch diameter water line within this property.
Surveys j
indicate contamination present to a depth of 96 inches.
Four alternatives were examined which covered complete remediation, partial remediation, and no remediation with the application of supplemental standards.
The cost of partial remediation is estimated at $260,526, but involves a high risk of damaging the existing water line which could result in additional costs and disruption of water service provided by this line.
Partial remediation would lower the surface gamma exposure rate to background levels, but would not eliminate radon emissions from the tailings.
In addition, it would not be possible to separate the clean fill placed by partia1'remediation from the remaining contaminated material in the future, resulting in a larger volume of 1
contaminated material.
These facts provide indication that partial remediation Is not a desirable course of action.
The cost of complete remediation is estimated to be $1.742,971.
The estimated volume of contaminated material is 13,289 cubic yards.
The land is not inhabited, and its use is not expected to change.
The maximum surface gamma 900618G399 9006G1 PDR WASTE pg WM-30
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exposure rate is 282 micro R per hour. -The greatest potential health risk is to utility workers who perform repairs in trenches.
This subject was addressed in a Utility Workers Health Risk Analysis, which is incorporated by reference 4
to this REA.- The NRC approved the Utility Workers Health Risk Analysis on i
i April 26, 1990.
Besides utility workers, the health risk to the general public is minimal.
The physical location of this property, adjacent to the frontage road of a highway, and the dose rate, which would require 1,773 hours0.00895 days <br />0.215 hours <br />0.00128 weeks <br />2.941265e-4 months <br /> of
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continuous exposure to reach the limits of 10 CFR 20.105, provide a basis Sor concluding that no significant risk to the public health will occur if supplemental standards are applied on this property.
Conclusion The location of the property, the fact that the land use is not likely to change, and the low public health hazard compared to the high cost of complete remediation, justify the application of supplemental standards for this property.
1 This REA meets the criteria established in 40 CFR 192.21(c) necessary to apply-supplemental standards.
i The proposal for no remedial actions on this property i
is reasonable under the cNumstances, and the requirements of 40 CFR 192.22(a) are also satisfied.
i The staff concurs with DOE that supplemental standards be applied for vicinity property GJ-970ll-0T.
The staff is concerned with the post-UMTRAP disposal of contaminated mill tailings which will remain in place as a result of the application of supplemental standards. Though supplemental standards have been appropriately applied, as in this case, utility line repairs ar9 certain to generate contaminated material which must be disposed of f.<r years to come.
This is an important issue, with potential impacts on public *alth.
The State of Colorado and DOF are working on addressing this issue and ull keep the NRC informed, N
a Paul W. Michaud Approved by:
A lagion E. Hall Director i
Case Closed:
040WM039390E l
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'ABBeach, RIV LLO Branch, LLWM PMichaud RCPD, CO
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CONCURRENCE:
DATE:
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