ML20155A614
| ML20155A614 | |
| Person / Time | |
|---|---|
| Issue date: | 08/03/1988 |
| From: | Heyer R, Pettengill H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| REF-WM-39 NUDOCS 8810060024 | |
| Download: ML20155A614 (4) | |
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1 AUG 3 1988 URF0:RSH Docket No. 40-WM039 040WM039150E MEMORANDUM FOR:
Docket File No. 40-WM039 FROM:
Ralph S. Heyer, Project Manager Licensing Branch 2 Uranium Recovery Field Office, Region IV 1
SUBJECT:
REVIEW 0F JUSTIFICATION FOR APPLICATION OF SUPPLEMENTAL STANDARDS AT VICINITY P!,CPERTY SL-018S/114 i
l I.
Background
l l
By submittal dated May 20, 1988, the Department of Energy (00E) supplied the final Radiological and Engineering Assessment (REA) which requested the application of supplemental standards on the contaminated area for vicinity property SL-018S/114.
This REA is for Roper Yard, which is a principle freight yard for the Denver and Rio Grande Western Railroad in Scit Lake City.
Incorporated with this REA are three previously submitted )artial REA's, each covering a different segment of the property:
the co-contaminated material; the entire property excluding the main track area; and the main track area.
The DOE's recommended option total cost is $417,000, with Supplemental Standards being applied to the entire main body of Roper (ard (SL-018$/114).
l In addition, information was submitted for application of supplemental standards for a Thorium deposit which is in the same area as SL-018S/114.
II.
Discussion A.
MAIN YARD Surface gamma readings on the prsporty ranged from 5 to 479 pR/hr.
This was compared to the background for tne Salt Lake City site which is approximately 10 pR/hr.
Readings taken from t1e track area south of Mill Creek ranged up to 479 pR/hr.
This was attributed to a combination of surface mill tailings and ore contamination as well as shine from the adjacent vitro pile.
A survey of the area after removal of the vitro pile showed a maximum exposure of 83 pR/hr.
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2 AUG 3 1988 Indoor surface gamma readings ranged from 1 to 15 micro R/hr.
A delta survey was conducted on the property to supplement the gamma survey conducted during the borehole survey.
Measured surface radium concentrations ranged from less than the Salt Lake City average background of 1.2 pCi/g to the highest detected value of 124 pCi/g.
Delta measurements were made on a 150-200 foot grid.
Radon daughter surveys performed inside buildings at the property were conducted in compliance with the proper RAC UMTRA procedures.
DOE proposes supplemental standards for the main railroad yard (SL-018).
This portion of the property is a highly active railroad yard, with spur lines continually in use with freight cars being switched from one place to the next.
The region for which Supplemental Standards are proposed is in the yard, including the main track to the south and it is estimated at $417,000.
The cost estimate for not applying Supplemental Standards in the main yard was l
proposed under two different scenarios.
The first was the complete decontamination of the entire main yard and would allow for certification of the entire property as being cleaned.
The cost was estimated at 15.9 million dollars.
The second scenario involved decontamination of the contiguous areas of contamination in the main yard.
The complete cleanup and release of the property could not be assumed under that option.
The southern third of the property would be cleaned; however, areas of significant contamination would i
remain on the remaining two-thirds.
A complete verification survey would be l
required, with spot decontamination as needed.
The cost of decontamination of those areas is estimated at 4.5 million dollars.
B.
THORIUM DEPOSIT Elevated levels of Th-230 were found during the Phase 2 remedial action performed at the Denver & Rio Grande Western Railroad Switching Yard, SL-018.
The Th-230 concentration in these samplos ranged from 1 to 940 pCi/g, with an average of 263 pCi/gm.
The deposit is located on the southern portion of Vicinity Property SL-018, adjacent to the main track of the Denver & Rio Grande l
Western Railroad.
The old Vitro Mill Tailings Pile site is to the west.
i The deposit is covered by 4.5 to 9 feet of clean fill.
Groundwater occurs within three to four feet of the surface.
The largest concentrations of Th-230 were located beneath the thickest cover.
Radon escaping from the residual material must diffuse through first a six foot saturated soil layer, and then through a three foot unsaturated layer.
i I
In MK-Ferguson's opinion, the potential long-term effects to the environment from the decay of Th-230 to radon gas at this site would be small compared to i
the high cost of additional remedial action, Results of RAECOM analysis and an appropriate correlation for ingrowth indicated that the current radiological hazard was minimal.
The deposit depth should preclude any significant near term contact of the residual thorium with the biosphere.
Supplemental standards may be applied using part "f" of 40 CFR 192.21.
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3 AUG 3 1988 l
i III. Conclusion Based on my review of the subject REA, associated correspondence and in accordance with Criterion "a", "c" and "f" of 40 CFR 192.21 and the NRC's "Guidelines for Justifying the Use of Supplemental Standards," in 40 CFR Part 192, dated July 3,1986, DOE satisfied the criteria deemed necessary to apply supplemental standards.
I recommend that concurrence be granted for the application of supplemental standards for the properties designated at SL-018S/114.
/s/
Ralph S. Heyer, Project Manager Licensing Branch 2 Uranium Recovery Field Office Region IV Approved by:
N Harry J. Pettengill, Chief Licensing Branch 2 Uranium Recovery Field Office i
Region IV Case Closed:
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