Notice of Availability of Final Environmental Impact Statement for the Proposed Blackfoot Bridge Mine, Caribou County, ID, 13429-13430 [2011-5497]

Agencies

• DEPARTMENT OF THE INTERIOR
• Bureau of Land Management

[Federal Register Volume 76, Number 48 (Friday, March 11, 2011)]
[Notices]
[Pages 13429-13430]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2011-5497]


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DEPARTMENT OF THE INTERIOR

Bureau of Land Management

[LLIDI02000. L71220000.EO0000.LVTFD0980300]


Notice of Availability of Final Environmental Impact Statement 
for the Proposed Blackfoot Bridge Mine, Caribou County, ID

AGENCY: Bureau of Land Management, Interior.

ACTION: Notice of availability.

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SUMMARY: In accordance with the National Environmental Policy Act of 
1969, the Bureau of Land Management (BLM) is announcing the 
availability of the Final Environmental Impact Statement (EIS) for the 
proposed Blackfoot Bridge Mine.

DATES: The Final EIS is now available for public review. The BLM Record 
of Decision will be released no sooner than 30 days after the 
Environmental Protection Agency publishes its Notice of Availability of 
the Final EIS in the Federal Register.

ADDRESSES: Copies of the Blackfoot Bridge Mine Final EIS are available 
in the BLM Pocatello Field Office at the following address: 4350 Cliffs 
Drive, Pocatello, Idaho 83204. In addition, an electronic copy of the 
Final EIS is available at the following Web site: https://www.blm.gov/id/st/en/prog/0.html.

FOR FURTHER INFORMATION CONTACT: Kyle Free, Bureau of Land Management, 
Pocatello Field Office, 4350 Cliffs Drive, Pocatello, Idaho 83204, 
phone (208) 478-6368, fax (208) 478-6376.

SUPPLEMENTARY INFORMATION:  The Final EIS was prepared to provide 
decision-makers and the public with an evaluation of significant 
environmental impacts resulting from the proposed action and from all 
reasonable alternatives. P4 Production, LLC (P4), a subsidiary of 
Monsanto Company, holds mineral leases issued by the United States, 
granting them exclusive rights to develop phosphate minerals in the 
Blackfoot Bridge area. P4 submitted a Mine and Reclamation Plan (MRP) 
to the BLM for the development of a phosphate mine on existing Federal 
leases and an application to modify these leases to increase their 
size. Prior to mining under the proposed MRP P4 must receive BLM 
approval and obtain additional Federal and state permits.
    The BLM has prepared a Final EIS to evaluate effects of the 
Blackfoot Bridge Mine upon the human environment, including the 
potential effects of selenium and other contaminants associated with 
other phosphate mines in the region. The Final EIS also considers 
appropriate mitigation measures. The National Environmental Policy Act 
of 1969 (NEPA) requires the BLM to evaluate the MRP, considering the no 
action alternative and other reasonable alternatives, before issuing 
decisions on the development of the phosphate leases and modification 
of the existing leases.
    The BLM is also required by the Mineral Leasing Act of 1920, as 
amended, and 43 CFR Part 3590, to evaluate the MRP from P4 to determine 
if the plan will achieve the ultimate maximum recovery of phosphate ore 
reserves contained within Federal Phosphate Leases I-05613 and I-
013709.
    The U.S. Army Corps of Engineers (USACE) is required to evaluate 
and respond to P4's application for a permit under Section 404 of the 
Clean Water Act, which is needed to implement the MRP. The USACE is 
informing the public of this application through a 30-day Public Notice 
for Application for Permit that will run concurrently with this Notice 
of Availability. The Final EIS provides the analysis upon which the BLM 
and other involved agencies can base their decisions.
    The Proposed Action consists of P4's Plan to develop the Blackfoot 
Bridge Mine using open pit mining methods to extract phosphate ore. The 
ore would be hauled about 8 miles to P4's existing Soda Springs 
elemental phosphorus plant. The mine would consist of three separate 
mine pits, the North, Mid, and South Pits. Mining would begin in the 
Mid Pit, followed by the North Pit and then the South Pit. Mining of 
the North Pit and portions of the Mid Pit are predicted to extend below 
groundwater level and would require the mine to pump water during 
portions of the 17-year mine life. All overburden would either be used 
to backfill the mine pits or be placed in the external East Overburden 
Pile (EOP) or Northwest Overburden Pile (NWOP). Other mine-related 
facilities would include an ore stockpile, a truck loading facility, an 
equipment yard, a water management system, topsoil stockpiles, roads, 
and sediment control structures. Approximately 739 acres of surface are 
expected to be disturbed over the life of the project, with about 674 
acres (91 percent) planned to be re-vegetated. Nine percent of the mine 
site would involve residual highwalls that cannot be re-vegetated. 
About 90 percent of the disturbance would occur on privately owned 
surface controlled by P4 and about 10 percent would occur on BLM 
managed surface lands.
    As phosphate mining has developed in southeast Idaho, increasing 
concern for surface and groundwater contamination has led to the 
development of various best management practices to control potential 
selenium migration from the mines. Placing an impermeable or low-
permeability cover over external overburden piles and pit backfilled 
areas is a preferred way to reduce infiltration into the materials to 
reduce the potential leaching of selenium into the environment.
    As part of the Final EIS analysis, groundwater modeling has been 
used to estimate the potential effects of the proposed action on water 
resources in the project area. Model results indicate that the Proposed 
Action, as designed, has the potential to release selenium 
concentrations to groundwater and surface water in excess of applicable 
water quality standards. Alternative waste rock capping designs 
(Alternatives 1A and 1B) were developed to reduce the amount of water 
that would contact the backfilled pits and external overburden piles. 
This

[[Page 13430]]

would reduce the volume of water containing constituents of concern 
that could potentially affect the quality of area groundwater and 
surface water and prevent the release of excessive selenium. 
Alternatives 1A and 1B would incorporate a layer of impermeable 
material called a laminated geosynthetic clay liner, or GCLL. The GCLL 
cover system would be comprised of the following materials (from 
surface to base):
     18 inches of topsoil;
     1 foot of weathered alluvium cover material;
     6 inches of drainage/protective layer material;
     GCLL;
     6 inches of a protective sub-grade layer (weathered 
alluvium or other earthen material); and
     Run of mine (ROM) overburden.
    The GCLL includes a thin layer of powdered clay sandwiched between 
two geotextile layers. A geotextile is a sheet of material that is 
resistant to penetration damage. The top geotextile layer is laminated 
with a polyethylene geomembrane layer, providing an additional layer of 
protection.
    Alternative 1A would cover all backfilled pits with the GCLL cover 
as well as 86 acres of the EOP and would cover the remaining areas with 
the Simple 1 cover, while Alternative 1B would cover all backfilled 
pits and the entire 141 acre EOP with the GCLL. While Alternatives 1A 
and 1B primarily address water quality issues, additional alternatives 
address other issues and are also considered in the Final EIS.
    The Proposed Action and Alternatives 1A and 1B include a lease 
modification to Phosphate Lease I-05613. The amended lease modification 
areas occur in 4 separate parcels located on private and BLM surface. 
The lease modification allows for extending proposed mine facilities 
from the original lease areas into an additional 300 acres.
    A Notice of Intent (NOI) to prepare this EIS was published in the 
Federal Register on February 3, 2006. Publication of the NOI in the 
Federal Register initiated a 56-day public scoping period for the 
Proposed Action that provided for acceptance of written comments. The 
scoping process identified concerns that included potential effects of 
the project on water resources; socioeconomic conditions; livestock 
grazing; reclamation and restoration; wildlife and vegetation; soils; 
threatened, endangered, and sensitive species; air quality; aesthetics; 
land use; visual resources; hazardous and solid wastes; tribal 
interests and cumulative effects.
    The Notice of Availability for the Draft EIS was published in the 
Federal Register on August 14, 2009. A 45-day comment period on the 
Draft EIS was extended by 30 days, extending the comment period to 
November 2, 2009. Agencies, organizations, and interested parties 
provided comments on the Draft EIS via mail, email, and public 
meetings. Comments also came in the form of postcards, form letters, 
and comment forms. A total of 6,994 comments were received. The 
majority, approximately 80 percent of the comments, expressed support 
for the project. Comments expressing concerns about the Draft EIS 
largely focused on surface and groundwater quality issues and the 
proximity of the mine to the Blackfoot River. In developing responses 
to these comments, additional mitigation measures have been added to 
Alternatives 1A and 1B. Alternative 1A is the Agency Preferred 
Alternative. Primary mitigation features added to Alternatives 1A and 
1B in the Final EIS include:
     GCLL coverage over the East Overburden Pile (EOP) has been 
expanded from 21 acres to 86 acres for Alternative 1A and the northern 
portion of the EOP will be constructed of limestone instead of chert. 
GCLL coverage over the entire 141- acre EOP for Alternative 1B remains 
unchanged from the Draft EIS.
     An Overburden Seepage Management System (OSMS) has been 
proposed as an addition protective measure for Alternatives 1A and 1B 
that would use a network of perforated pipes constructed underneath the 
external overburden piles for additional protection against 
unanticipated leakage events and during construction of the EOP. and
     An Adaptive Management Plan for the water management 
system has been developed that would result in placement of dredged or 
fill material in areas currently containing wetlands and non-wetland 
waters of the U.S. only as necessary to manage runoff water.
    It is currently expected that P4's existing South Rasmussen Mine 
will be depleted sometime in 2012. Because of operating requirements at 
the Soda Springs processing plant, it is necessary to bring Blackfoot 
Bridge Mine online in 2011. In the initial years of Blackfoot Bridge 
mining, a blend of ores from both South Rasmussen Mine and Blackfoot 
Bridge Mine would be required.

    Authority:  Mineral Leasing Act of 1920, as amended and the 
Federal Land Policy and Management Act of 1976, as amended.

Joe Kraayenbrink,
BLM Idaho Falls District Manager.
[FR Doc. 2011-5497 Filed 3-10-11; 8:45 am]
BILLING CODE 4310-GG-P