ML20236N771
| ML20236N771 | |
| Person / Time | |
|---|---|
| Issue date: | 07/10/1987 |
| From: | Westbrook K NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Starmer J NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| REF-WM-86 NUDOCS 8708120099 | |
| Download: ML20236N771 (2) | |
Text
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FM V l MEM0 REPORT ON VISITS KW pg '".
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MEMORANDUM FOR: John Starmer, Acting Chief Technical Branch l
Division of Low-Level Waste Management and Decommissioning, NMSS l
l FROM: Kristin B. Westbrook Technical Branch l
Division of Low-Level Waste Management and Decommissioning, NMSS
SUBJECT:
REPORT ON VISITS TO SLICK ROCK, CO (JUNE 9, 1987)
AND RIFLE, CO (JUNE 10,1987), UMTRA PROJECT SITES On June 9, 1987, I visited the Slick Rock Site. Others in attendance included Mike Yeung (NRC), R. John Starmer (NRC), Andrew Harvey (Sergent, Hauskins & Beckwith), Mark Jackson (Jacobs Engineering Group Inc.) Jon Luellan (State Co), John Dupuy (Jacobs Engineering Group Inc.) and Mike Abrams (DGE).
I field checked several items for Joel Grimm (NRC-Geomorphologist).
The primary concern about the geology of the Slick Rock site is the question of whether or not unit QT2 (Quaternary terrace 2) interfingers with the overlying alluvium and represents a lateral facies change below the site of the tailings pile. I traced unit QT2 in Corral Draw walking in the direction of the trailer park and saw no evidence of interfingering. The QT2 clearly is overlain by alluvium. This issue is important to the hydrogeologic properties of the material under the tailings pile. If, for example, the pile overlay an interfingering and lateral facies change then different hydrological properties would need to be characterized. This characterization would be more complex than if two distinct units overlay each other under the pile.
For the Slick Rock Site, I looked at several other more minor concerns of Joel Grimm's. My observations have been discussed with Joel and his concerns are all fully outlined as his individual comments on the Slick Rock DRAP and EA. Also, Joel Grimm will be discussing the issues in his DRAP and EA comments with geologist Andrew Harvey and telephone conversation reports are to be forthcoming. Therefore, due to the adequate record of concerns in Joel's DRAP and EA comments the complexity of the background needed to explain these minor concerns and because the concerns are being delt with by Joel Grimm, as specified above, no further discussion will be given here.
On June 10, 1987, I visited the Rifle sites. Others in attendance included Mike Young (NRC), R. John Starmer (NRC), Jon Luellan (State Co), William Taber (Jacobs Engineering Group, Inc.) and Frank Bosiljevac (DOE). A primary concern about this site is the potential for gullying. I field checked the main gully running through approximately the center of the Estes Gulch site (where the rifle tailings are proposed to be disposed of) the gully was about 4' to 6' 0708120099 070710 PDR WASTE PDR WM-86
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MEMO REPORT ON VISITS KW wide and about 8' to 15' deep. The sides of the gully were unstable and exhibited several places where mudflows had occurred down the banks. The surface soils, that the gulch is formed in, appear easily eroded by running water and are subject to flowage when wet.
I climbed upslope toward the Grand Hogback. From there I could see that l
the Estes Gulch site has been separated from the surface drainage coming down from the Grand Hogback by deep and wide canyons that run around the N-SW and j N-SE sides of Estes Gulch. There are erosion problems at Estes Gulch even with i a very limited surface drainage area for runoff. A major issue is whether or i not the erosion problems can be designed for successfully.
1 Original Signed By Kristin B. Westbrook Technical Branch Division of Low-Level Waste Management and Decommissioning, NMSS L _