ML22109A085
| ML22109A085 | |
| Person / Time | |
|---|---|
| Issue date: | 04/22/2022 |
| From: | NRC/OCM |
| To: | |
| Shared Package | |
| ML22096A216 | List: |
| References | |
| M220422B | |
| Download: ML22109A085 (20) | |
Text
Dawn Mill and the Spokane Tribe BRIAN CROSSLEY SPOKANE TRIBE WATER & FISH PROGRAM MANAGER
Dawn Mining Company (DMC)
Operated 1956 to early 1980s Processed 58 million cubic ft uranium ore mostly from Midnite Mine (DMC)
NRC delegated authority 1969 to Washington Dept. of Health, Waste Mgmt. Section 1981 1st lined disposal area approved TDA-4 1982 milling ceased, 1987 closure and reclamation plan 1989 groundwater contamination detected along Chamokane Creek (WSA) 1992 asked to place off-site uranium mill tailings in TDA-4, 1994 WDOH agrees with stipulation ground water remediation occur (WSA)
DMC cont.
2001 WDOH amended license to allow filtercake from Midnite in TDA-4, stop pumping water from wells along Chamokane because concentrations were not dropping; explored bio-remediation 2008 bio-remediation unsuccessful and ceased 2009 DMC discovered groundwater contamination below ore stock pile area and installed more monitoring wells (Lower North Area) 2010 covered TDA-4 end of waste accumulation 2013 Constructed new evaporation pond (EP6)
LNA WSA
Alternative Concentration Limits (ACL) 2015 WDOH agrees to let DMC apply for ACLs Point of Compliance (POC)
Point of Exposure (POE)
NRC guidance the licensee cannot rely on natural flushing beyond the POE to either attenuate contamination or delay the implementation of corrective action programs Increasing concentrations, intentional site selection, human and ecological health risk assessment deficiencies
Benefits Analysis
Brian Crossley Water & Fish Program Manager Spokane Tribe, DNR crossley@spokanetribe.com 509-626-4425