ML20211Q650
| ML20211Q650 | |
| Person / Time | |
|---|---|
| Issue date: | 11/18/1986 |
| From: | Smykowski S NRC |
| To: | |
| References | |
| REF-WM-72 NUDOCS 8612220010 | |
| Download: ML20211Q650 (2) | |
Text
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SUMMARY
I contacted Rager to obtain information related to the SIP alternative for the Spook UMTRAP site. The following items were discussed: ,
1
- 1) The lithology at the bottom of the pit consists of a coarse-grained I cemented sandstone. DOE recognizes that this sandstone layer is an unfavorable feature from a ground water standpoint, and that special design features will be required to reduce the amount of ground water contamination if the SIP alternative is chosen.
- 2) The TAC is planning on specifying compaction for the tailings, radon barrier, and overburden fill materials. A permeability for the overburden fill material will be specified to minimize the amount of infiltrating water into the stabilized pile.
- 3) The radon barrier material may be different from the overburden material. The TAC is considering placing a filter layer in the cover system to divert infiltrating water away from the pile.
- 4) Clean-up operations of windblown material may be difficult since contamination levels of the windblown tailings may be indistinguishable from those of the natural surface materials.
- 5) The cost for placing the overburden fill in the pit has not been identified in Table 6.1 of the CADSAR because the state of Wyoming will bear this cost rather than DOE.
- 6) The open pit is approximately 100 feet deep. Approximately 50 to 80 feet of clean overburden will be placed over the stabilized tailings.
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SUMMARY
The TAC has requested staff agreement (conference call between Mark Haisfield and TAC, November 12,1986) to perform less field characterization and data collection for this specific SIP alternative than would typically be expected to support the SIP alternative for other sites. Based on the information presented in the draft CADSAR and the discussion with Rager, Since this stabilization-in-place appears to be a favorable alternative.
alternative consists of below grade disposal, extensive field characterization to address certain geotechnical concerns such as settlement, liquefaction, and shear strengths of the tailings material does not appear to be necessary at this time.
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