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(last updated 31 Aug 2008)
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Bighorn Canyon National Recreation Area
> Download Draft Environmental Assessment (May 2003) (892k PDF)
Comments on the study may be submitted by July 15, 2003.
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"Green Mountain Ion Exchange (GMIX) facility was an ion exchange facility that removed uranium from mine water and is located in Fremont County, Wyoming south of Jeffrey City, Wyoming in the Crooks Gap Uranium Mining District. The facility consisted of; one main, 40 foot by 60 foot [12.2m x 18.3m], building; one, 24 foot by 24 foot [7.3m x 7.3m], auxiliary water treatment building (BaCl building); primary settling pond (Roberts No.3 Pond) approximate surface area of disturbance is 2.4 acres [1 ha]; and secondary settling pond (Roberts No.2 Pond) with approximate surface area of disturbance 3.9 acres [1.6 ha].""The current status is that all 11e(2) material has been removed to Sweetwater Mill tailings facility, NRC license No. SUA-1350, with soil verification sampling completed."
(Completion Report Oct. 24, 2002)
On Jan. 3, 2003, NRC published a "Notice of Request to Terminate Source Material, License SUA-1524, for the Green Mountain Ion-Exchange Site in Fremont County, WY and Opportunity to Provide Comments and to Request a Hearing"
Federal Register, Jan. 3, 2003 (Vol. 68, No. 2), p. 392-393 (download full notice ).
There were no comments or requests for a hearing in response to this FR notice.
NRC Facility Info
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The purpose of the proposed amendment is to authorize the establishment of ACLs instead of ground water protection standards for six constituents at the Licensee's Jeffrey City, Wyoming, facility. Specifically, this amendment will establish ACLs for ammonia, manganese, molybdenum, nitrate, radium-226 and -228, and natural uranium. This amendment will also require the Licensee to establish institutional controls on all properties within the long-term surveillance boundary to preclude domestic ground water use. On October 29, 1999, the Licensee requested that NRC approve the proposed amendment.
Federal Register: September 6, 2006 (Volume 71, Number 172) p. 52589-52590 (download full text )
> Download Environmental Assessment for Amendment to Source Materials License SUA-56 Ground Water Alternate Concentration Limits, August 2006 (ADAMS Accession No. ML062130316)
In the EA, NRC discusses various groundwater treatment alternatives, not including permeable reactive barriers, though. The alternatives discussed are dismissed for reasons of inefficiency and of excessive cost. In approving WNI's preferred alternative, NRC permits the contamination of clean groundwater by the progressing contaminant plume and accepts that drinking water wells in the Red Mule area will become unsuitable for domestic use in the future.
On September 28, 2006, NRC issued the requested license amendment.
View animation of groundwater plume (70k)
WNI's preferred alternative "Pathway Elimination + Institutional Control" (!) would prohibit groundwater use for drinking water in an area of 3,635 acres (1,471 ha) that will be affected by the dispersing contaminant plume within 1000 years. Well owners are to be supplied with alternate drinking water supplies, instead. This area is much larger and in addition to the area of 1,640 acres (664 ha) used for stabilizing the uranium mill tailings pile itself. The costs for this preferred alternative would be $114,000 only, rather than the $17.9 - 117 million for the other alternatives considered.
(see: Minutes From The Groundwater Corrective Action Plan Meeting On September 22, 1999, U.S. NRC, Nov. 1, 1999, available on ADAMS )
On March 7, 2003, WNI filed a Supplemental Groundwater Modeling Report, indicating that the area affected by the groundwater plume after 1000 years would be smaller than previously assumed. Based on the results of the new predictions, WNI modified the proposed long-term care boundary for the site and its surroundings.
View revised animation of groundwater plume (153k)
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"The U.S. Nuclear Regulatory Commission (NRC) has received, by letter dated December 5, 2002, as supplemented by an e-mail received February 3, 2003, a request from Pathfinder Mining Company to amend License Condition (LC) 61A(3) and 61B(1) of Source Material License SUA-672 for the Lucky Mc Site. The license amendment request proposes to modify LC 61A(3) to change the completion date for radon barrier placement to December 31, 2004, a delay of two years, and to modify LC 61B(1) to change the target completion date for the erosion protection placement to December 31, 2004, a delay of two years."
A request for a hearing must be filed within 30 days of March 4, 2003.
| Constituents | STD | ACL (at POC) | POE |
|---|---|---|---|
| Uranium [mg/l] | 0.11 | 1.70 | 1.17 |
| Selenium [mg/l] | 0.01 | 1.10 | 0.26 |
| Nickel [mg/l] | 0.09 | 0.85 | 0.15 |
| Ra-226 + Ra-228 [pCi/l] | 5.0 | 7.50 | 5.60 |
| Cadmium [mg/l] | 0.01 | 0.02 | 0.01 |
| Beryllium [mg/l] | 0.05 | 0.07 | 0.05 |
On September 9, 2002, NRC staff issued its "Draft Environmental Assessment for the Pathfinder Mine Corporation’s Lucky Mc uranium mill tailings site, Gas Hills region of Wyoming", concluding "that the environmental impacts associated with the proposed action are not significant and therefore do not warrant denial of the license amendment request."
Under the current program, a total of 197 million gallons [746,000 m3] of water has been pumped from the aquifer and 193 million gallons [731,000 m3] of fresh water has been injected through 2001. Also, approximately 217 million gallons [821,000 m3] of water have been pumped from the tailings.
On Dec. 12, 2002, NRC issed the "Environmental Assessment for the Pathfinder Mine Corporation's Lucky Mc uranium mill tailings site, Gas Hills region of Wyoming".
On Dec. 18, 2002, NRC published a related Federal Register notice :
Federal Register, Dec. 18, 2002 (Vol. 67, No. 243), p. 77529-77530 (download full notice ).
A request for a hearing must be filed within 30 days of Dec. 18, 2002.
On Dec. 20, 2002, NRC released a Final Finding of No Significant Impact for the Proposed Use of Alternate Concentration Limits:
Federal Register, December 20, 2002 (Volume 67, Number 245), p. 78029-78030 (download full notice ).
Also, on Dec. 20, 2002, NRC issued the requested license amendment.
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"SUMMARY: Notice is hereby given that the U.S. Nuclear Regulatory Commission (NRC) proposes to amend NRC Source Material License SUA-672, approving Pathfinder Mines Corporation's (PMC's) ``no action'' proposal on cleanup of Reid Draw located downgradient of the Lucky Mc tailings system at Gas Hills, Wyoming. This license currently authorizes PMC to possess byproduct material in the form of uranium waste tailings generated by the licensee's milling operations at the site. In accordance with the requirements of 10 CFR Part 51, an Environmental Assessment (EA) was performed by the NRC staff in support of its review of PMC's Environmental Report (ER) on the status of Reid Draw. The conclusion of the Environmental Assessment is a Finding of No Significant Impact (FONSI) of ``no action'' proposal on cleanup of Reid Draw."The proposal concerns an area contaminated from regular releases of excess tailings liquid and from one emergency release of 23 million gallons (87,000 cubic meters). Pathfinder Mines Corporation is 100% owned by COGEMA.
NRC Facility Info
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), NRC demanded ExxonMobil to provide a characterization plan to further assess the offsite migration of site-generated radionuclides and chemicals:
"In a letter to the U.S. Nuclear Regulatory Commission (NRC) dated March 18, 2008 (See ADAMS ML080850495
Because of the above discrepancy, ExxonMobil should provide a characterization plan for the ExxonMobil property to the NRC within 90 days of the receipt of this letter. [...]" [emphasis added]
Long Term Pit Lake and Groundwater Hydrology at the Highland Mine Site, Final Report, prepared for ExxonMobil by Tetra Tech, May 17, 2007
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"By letter dated January 16, 2006, ExxonMobil Refining and Supply Company (ExxonMobil) submitted an application to the U.S. Nuclear Regulatory Commission (NRC) staff, requesting an amendment to Source Materials License SUA-1139 for the Highland Reclamation Project (Highland) to modify the groundwater protection standards for chromium, uranium, selenium, and nickel at the point of compliance wells designated in the license. Pursuant to the requirements of 10 CFR Part 51, “Environmental Protection Regulations for Domestic Licensing and Related Regulatory Functions,” the staff has prepared a draft Environmental Assessment (EA) of the ExxonMobil request to evaluate the potential environmental impacts of the proposed action (Enclosure). After a review of the potential impacts of the proposed action, the staff concludes that the proposed action will not have a significant impact on public health and safety and the environment and, as such, a Finding of No Significant Impact is appropriate." [...] (NRC letter to Wyoming Department of Environmental Quality, May 2, 2006)
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"SUMMARY: Notice is hereby given that the U.S. Nuclear Regulatory Commission (NRC) proposes to amend Exxon Corporation's (Exxon's) Source Material License SUA-1139, to allow alternate concentration limits (ACLs) for groundwater hazardous constituents at the Highland uranium mill site in Converse County, Wyoming. An Environmental Assessment (EA) was performed by the NRC staff in accordance with the requirements of 10 CFR part 51. The conclusion of the EA is a Finding of No Significant Impact (FONSI) for this licensing action."> See also Notice in Federal Register Vol. 64, No. 8 (January 13, 1999) p. 2241 (download full notice
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NRC Facility Info
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"The U.S. Nuclear Regulatory Commission (NRC) has received, by letter dated December 26, 2002, as supplemented by an e-mail received February 3, 2003, a request from Pathfinder Mining Company to amend License Condition (LC) 50A(3) & 50B(1) of Source Material License SUA-442 for the Shirley Basin Site. The license amendment request proposes to modify LC 50A(3) to change the completion date for radon barrier placement to December 31, 2006, a delay of two years, and to modify LC 50B(1) to change the target completion date for the erosion protection placement to December 31, 2006, a delay of one year."
"The revised plan differs from the approved plan in two key ways. The revision involves a substantial increase in regrading in order to create relatively flat surfaces or benches that utilize rock-protected apron slopes to make the transition from upper benches to lower benches. The result is a reclamation surface covered primarily by vegetated topsoil instead of large expanses of rock.
The other significant change concerns the thickness of the radon barrier. When the approved plan was designed, the available information concerning the Ra-226 source term of the tailings was limited. [...] After completing the interim cover a tailings sampling program was initiated in order to obtain comprehensive data on the tailings source term. [...] The result of the analysis was a significantly lower source term than presented in the approved plan. Much of this reduction was due to the presence of substantial layers of interim cover that was treated for radon flux modeling purposes as the upper part of the source term. Consequently, the required barrier thickness to meet the 10 CFR 40 Appendix A radon flux criterium has dropped substantially." (emphasis added)
On Jan. 24, 2003, NRC staff issued an Draft Environmental Assessment proposing approval of PMC's amendment request.
On April 30, 2003, NRC announced a Finding of No Significant Impact and Availability of the Environmental Assessment Regarding the Proposed Changes to the Reclamation Plan:
Federal Register: May 9, 2003 (Volume 68, Number 90) p. 25070-25071 (view full text )
On Aug. 1, 2003, NRC changed the license accordingly.
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"SUMMARY: Notice is hereby given that the U.S. Nuclear Regulatory Commission (NRC) has received, by letter dated April 3, 2000, an application from Pathfinder Mines Corporation to establish Alternate Concentration Limits and, accordingly, amend Condition 47 of its Source Material License No. SUA-442 for the Shirley Basin Wyoming, uranium mill."
PMC requests a Point of Compliance ACL for uranium that is 64-fold and for thorium-230 19-fold the current site standard. The expected resulting concentrations at the "Point of Exposure" (defined by PMC) are for uranium 0.15 mg/l, and for thorium-230 0.3 pCi/l (0.011 Bq/l).
According to PMC, "the use of well water containing 0.15 mg U/l by the residents at this site is not expected to result in uranium burdens in the kidney that are associated with kidney damage." This uranium concentration, however, exceeds the proposed EPA standard of 20 µg/l 7-fold and the 1998 World Health Organization guideline of 2 µg/l 75-fold.
| EPA std 40 CFR 192 | current POC site std | proposed POC ACL | expected POE conc. for proposed POC ACL | EPA drinking water std | WHO drinking water guideline | |
| uranium | 0.044 mg/l * | 0.07 mg/l | 4.40 - 4.45 mg/l | 0.15 mg/l | 0.02 mg/l *** | 0.002 mg/l |
| thorium-230 | (15 pCi/l) ** | 0.3 pCi/l | 5.53 - 5.76 pCi/l | 0.3 pCi/l | (15 pCi/l) ** |
Background documents are available through ADAMS .
On Dec. 24, 2002, NRC staff issued its draft environmental assessment of the request for Alternate Concentration Limits. From the conclusions:
"Based on its review, the NRC staff has concluded that the environmental impacts associated with the proposed action are not significant and, therefore, do not warrant denial of the license amendment request."
On July 31, 2005, NRC staff issued the final environmental assessment of the request for Alternate Concentration Limits. NRC staff proposes to approve the license amendment request with additional conditions, "because concerns exist regarding impacts to Spring Creek after CAP deactivation".
On August 25, 2005, NRC issued a Finding of No Significant Impact.
Federal Register: September 1, 2005 (Volume 70, Number 169) p. 52136-52137
(download full text )
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"SUMMARY: Notice is hereby given that the U.S. Nuclear Regulatory Commission (NRC) has received, by letter dated October 29, 1999, an application from Pathfinder Mines Corporation (PMC) to amend License Condition (LC) 50 of its Source Material License No. SUA-442 for the Shirley Basin, Wyoming uranium mill site. The license amendment application proposes to modify LC 50 to change the completion date for three site-reclamation milestones. The new dates proposed by PMC would extend completion of placement of the interim cover over tailings pile, completion of placement of the final radon barrier, and completion of placement of the erosion protection cover by two years."
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"Pathfinder Mines Corporation, Final Finding of No Significant Impact, Notice of Opportunity for Hearing.SUMMARY: Notice is hereby given that the U.S. Nuclear Regulatory Commission (NRC) proposes to amend NRC Source Material License SUA-442 to authorize Pathfinder Mines Corporation (PMC) to reclaim the Shirley Basin uranium mill site located in Carbon County, Wyoming. This license currently authorizes PMC to possess byproduct material in the form of uranium waste tailings generated by the licensee's milling operations at the site. An Environmental Assessment (EA) was performed by the NRC staff in support of its review of PMC's license amendment request, in accordance with the requirements of 10 CFR Part 51. The conclusion of the Environmental Assessment is a Finding of No Significant Impact (FONSI) for the proposed licensing action of approval of a reclamation plan."
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"By letter dated April 25, 2002, Petrotomics Company (Petrotomics) requested that License Condition (LC) 47B of the Shirley Basin site Source Materials License SUA-551 be amended to modify the groundwater protection standard for selenium at the designated point of compliance (POC) wells. Specifically, Petrotomics proposed to increase the standard for selenium from the current value of 0.023 mg/l to 0.12 mg/l at POC wells 5DC, 19DC, 5SC, and 51SC. In a telephone conference on August 21, 2002, the staff requested that Petrotomics perform additional selenium transport simulations to support the license amendment request and this additional information was provided in a letter dated September 12, 2002. The U.S. Nuclear Regulatory Commission (NRC) staff has completed its review of the Petrotomics amendment request and the staff’s detailed evaluation is documented in the enclosed Technical Evaluation Report (Enclosure 1).
Based on its review, the staff concludes that the Petrotomics request to amend LC 47B to modify the selenium groundwater protection standard is acceptable." (from NRC letter to Petrotomics, September 27, 2002, emphasis added)
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"Petrotomics Company, Shirley Basin, WY; Final Finding of No Significant ImpactSUMMARY: Notice is hereby given that the U.S. Nuclear Regulatory Commission (NRC) proposes to amend Petrotomics Company's (Petrotomics') Source Material License SUA-551, to allow alternate concentration limits (ACLs) for groundwater hazardous constituents at the Shirley Basin uranium mill site in Carbon County, Wyoming. An Environmental Assessment (EA) was performed by the NRC staff in accordance with the requirements of 10 CFR part 51. The conclusion of the EA is a Finding of No Significant Impact (FONSI) for this licensing action."
"Meeting Regarding Groundwater Cleanup at the Shirley Basin Uranium Mill Site(NRC Weekly Information Report For the Week Ending August 21, 1998)On August 13, 1998, staff from the Division of Waste Management met with representatives of the Petrotomics Company (Petrotomics), and the Wyoming Department of Environmental Quality (WDEQ) to discuss and resolve issues related to groundwater cleanup at Petrotomics' uranium mill site in Shirley Basin, Wyoming. The main issue is that Petrotomics would not be able to comply with the State of Wyoming groundwater standards, and unlike the Nuclear Regulatory Commission, the WDEQ standards have No risk-based provision such as those contained in 10 CFR Part 40, Appendix A, covering alternate concentration limits. Petrotomics discussed its approach in resolving the WDEQ identified technical issues as well as its plan to work with WDEQ in seeking flexibility in WDEQ's standards at the statutory level. Petrotomics is scheduled to submit its response to the technical issues to WDEQ by the middle of October 1998."
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Federal Register: January 27, 2006 (Volume 71, Number 18) p. 4624 (download full text )
> Download NRC's Environmental Assessment, Jan. 20, 2006 (ADAMS)
By letter dated June 17, 2005, Umetco requested from NRC a license amendment to revise the Alternate Concentration Limit (ACL) for Lead-210 (Pb-210) for the Southwestern Flow Regime (SWFR) four-fold to 189 pCi/L (7 Bq/L), since monitoring of Point of Compliance (POC) Well GW7 indicates increased concentrations of Pb-210 exceeding the ACL of 46.7 pCi/L (1.73 Bq/L).
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"SUMMARY: The U. S. Nuclear Regulatory Commission (NRC) proposes to amend NRC Source Material License SUA-648 to authorize the licensee, Umetco Minerals Corporation (Umetco) to apply Alternate Concentration Limits (ACL) to licensed constituents of ground water according to the submitted plan. An Environmental Assessment (EA) was performed by the NRC staff in support of its review of Umetco's license amendment request, in accordance with the requirements of 10 CFR Part 51. The conclusion of the Environmental Assessment is a Finding of No Significant Impact (FONSI) for the proposed licensing action."
A request for a hearing must be filed within 30 days from March 29, 2002.
On May 11, 2001 Umetco had applied for Alternate Groundwater Concentration Limits at the Gas Hills uranium mill site.
| Constituent | Western Flow Regime (Lower Wind River Aquifer) |
Southwestern Flow Regime (Upper Wind River Aquifer) | ||
| STD | ACL | STD | ACL | |
| arsenic [mg/l] | 0.05 | 1.80 | 0.05 | 1.36 |
| beryllium [mg/l] | 0.05 | 1.64 | 0.01 | 1.70 |
| gross alpha [pCi/l] | 46 | 3,338 | 17.8 | 6,223 |
| lead-210 [pCi/l] | 5.0 | 35.4 | 4.6 | 46.7 |
| nickel [mg/l] | 0.06 | 13.0 | 0.04 | 9.34 |
| radium-226+228 [pCi/l] | 31.5 | 250 | 24.9 | 353 |
| selenium [mg/l] | 0.01 | 0.161 | 0.01 | 0.53 |
| thorium-230 [pCi/l] | 6.6 | 57.4 | 4.8 | 44.8 |
| uranium-natural [mg/l] | 0.13 | 11.9 | 0.29 | 34.1 |
On January 25, 2002, NRC issued a draft Environmental Assessment for this application: "Based on its review, the NRC staff has concluded that the environmental impacts associated with the proposed action do not warrant denial of the license amendment. [...] The NRC staff has determined that the proper action is to issue a FONSI in the Federal Register."
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"SUMMARY: The U.S. Nuclear Regulatory Commission (NRC) proposes to amend NRC Source Material License SUA-648 to authorize the licensee, Umetco Minerals Corporation (Umetco), to decommission the contaminated land associated with the operation of the uranium mill facility according to the Revised Soil Decommissioning Plan submitted September 15, 2000, as amended. The Umetco East Gas Hills site, is located in Natrona County, Wyoming, approximately 50 miles (80 kilometers) southeast of the town of Riverton, Wyoming. The mill operated from 1960 to 1979 and was dismantled in 1992. During operation, wind-blown tailings and tailings- solution from the Above-Grade Impoundment contaminated areas north of the Impoundment. A portion of the land contaminated with byproduct material was remediated (excavated) in 1993. Several changes and improvements have been proposed in the revised decommissioning plan.A request for a hearing must be filed within 30 days from March 1, 2001.
An Environmental Assessment (EA) was performed by the NRC staff in support of its review of Umetco's license amendment request, in accordance with the requirements of 10 CFR part 51. The conclusion of the Environmental Assessment is a Finding of No Significant Impact (FONSI) for the proposed licensing action."
The EA and other background documents are available through ADAMS .
- watchout: wrong docket number shown in notice):
SUMMARY: The Umetco Minerals Corporation (Umetco) requested that the U.S. Nuclear Regulatory Commission (NRC) amend its NRC Source Material License SUA-648 to authorize reclamation of the A-9 Repository (disposal cell), located in Natrona County, Wyoming, according to the 1998 Enhanced Reclamation Plan, as amended. The Umetco East Gas Hills site is located approximately 50 miles (80 kilometers) southeast of the town of Riverton, Wyoming. The A-9 cell is a former surface uranium mine that was lined with clay and used for mill tailings disposal. Cover construction was begun under a previously approved reclamation design and several changes have been proposed in the enhanced plan. An Environmental Assessment (EA) was performed by the NRC staff in support of its review of Umetco's license amendment request, in accordance with the requirements of 10 CFR part 51. The conclusion of the EA is a Finding of No Significant Impact (FONSI) for the proposed licensing action.
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SUMMARY: The U.S. Nuclear Regulatory Commission (NRC) proposes to amend NRC Source Material License SUA-648 to authorize the licensee, Umetco Minerals Corporation (Umetco), to reclaim the Above-Grade Impoundment (Impoundment), located in Natrona County, Wyoming, according to the 1997 Enhanced Reclamation Plan, as amended. The Umetco East Gas Hills site is located approximately 50 miles (80 kilometers) southeast of the town of Riverton, Wyoming. The Impoundment was constructed to a previously approved reclamation design, except for the top cover layer, and several changes have been proposed in the enhanced plan. An Environmental Assessment (EA) was performed by the NRC staff in support of its review of Umetco's license amendment request, in accordance with the requirements of 10 CFR Part 51. The conclusion of the Environmental Assessment is a Finding of No Significant Impact (FONSI) for the proposed licensing action.
See also Notice in Federal Register Vol.63, No.231, p.66586 (Dec 2, 1998)
(download full
notice ).
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"SUMMARY: The U.S. Nuclear Regulatory Commission (NRC) proposes to amend NRC Source Material License SUA-648 to authorize the licensee, Umetco Minerals Corporation (Umetco), to reclaim the commercial heap leach area, located in Natrona County, Wyoming, according to the 1996 Reclamation Plan, as amended. This license currently authorizes Umetco to receive, acquire, possess, and transfer uranium at the Umetco East Gas Hills site, which is located approximately 50 miles (80 kilometers) southeast of the town of Riverton, Wyoming. An Environmental Assessment (EA) was performed by the NRC staff in support of its review of Umetco's license amendment request, in accordance with the requirements of 10 CFR Part 51. The conclusion of the Environmental Assessment is a Finding of No Significant Impact (FONSI) for the proposed licensing action."
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"On February 13, 1998, staff from the Division of Waste Management issued a letter approving the Final Reclamation Plan for Tailings Pond No. 2 at the American Nuclear Corporation (ANC) uranium mill and tailings site, Gas Hills, Wyoming. The plan was submitted by the Wyoming Department of Environmental Quality (WDEQ)> View American Nuclear Corp 2000 Annual Report (April 4, 2001)The ANC site reclamation plan was approved by NRC in 1984, and was one of the eight plans determined to be acceptable under Commission Paper SECY-95-155 on June 29, 1995.
WDEQ and its contractors worked with NRC staff to improve the ANC plan, and it is this improved plan which was approved February 13, 1998. The plan also included a preliminary reclamation plan for Pond No. 1; a final plan for Pond No. 1 will be submitted by WDEQ for NRC review and approval prior to reclamation of Pond No. 1."
(U.S. NRC Weekly Information Report for the week ending February 20, 1998)
(EDGAR)
> View NRC press release No. 97-164
> See also Notice in
Federal Register Vol.62 p.55838-55840 (Oct. 28, 1997)
NRC Facility Info
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"The U.S. Nuclear Regulatory Commission proposes to amend NRC Source Material License SUA-1310 for the licensee, Bear Creek Uranium Company, to allow alternate concentration limits for groundwater hazardous constituents at the Bear Creek uranium facility in Converse County, Wyoming. An Environmental Assessment was performed by the NRC staff in accordance with the requirements of 10 CFR Part 51. The conclusion of the Environmental Assessment is a Finding of No Significant Impact for the proposed licensing action."
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