_INSPECTION - C1981008 ‎(3)‎

• Permit No: C1981008
• IBM Index Class Name: Inspection
• Doc Name: Inspection Report
• From: DRMS
• To: Ross Gubka
• Inspection Date: 10/29/2013
• Email Name: MPB
• Email Name: DIH
• Media Type: D
• Archive: No

October 29,2013 C-1981-008/New Horizon Mine MPB
Inspection Topic Summary
NOTE: Y=Inspected N=Not Inspected R=Comments Noted V=Violation Issued NA=Not Applicable
N -Air Resource Protection Y -Roads
N -Availability of Records N -Reclamation Success
N -Backfill& Grading N -Revegetation
NA -Excess Spoil and Dev. Waste NA - Subsidence
NA -Explosives N - Slides and Other Damage
N -Fish&Wildlife NA - Support Facilities On-site
R -Hydrologic Balance N - Signs and Markers
Y -Gen. Compliance With Mine Plan N - Support Facilities Not On-site
NA -Other N - Special Categories Of Mining
NA -Processing Waste N -Topsoil
COMMENTS
This was a partial inspection of the New Horizon Mine conducted on October 29,2013 by Mike Boulay of the
Division of Reclamation,Mining and Safety Grand Junction Field Office. Ross Gubka and David Anderson of
Western Fuels-Colorado and Chris Gilbreath of Tri-State Generation and Transmission Association,Inc. (Tri-
State)were present during the entire inspection. Weather conditions were cold and raining with intermittent sleet.
Ground conditions were wet and muddy and became increasingly worse as the inspection progressed. The
duration of the inspection was cut short due to the inclement weather and difficult driving conditions on non-paved
areas of the site.
HYDROLOGIC BALANCE -Rule 4.05
Drainage Control 4.05.1,4.05.2,4.05.3; Siltation Structures 4.05.5,4.05.6; Discharge Structures 4.05.7,4.05.10;
Diversions 4.05.4;Effluent Limits 4.05.2; Ground Water Monitoring 4.05.13; Surface Water Monitoring 4.05.13;
Drainage —Acid and Toxic Materials 4.05.8; Impoundments 4.05.6,4.05.9; Stream Buffer Zones 4.05.18:
Sedimentation Ponds 007,011,and 013 were viewed during this inspection. All of the ponds were retaining water
at the time of the inspection. Pond inlets,embankments and discharge structures were stable at all pond locations.
During the last complete inspection of the site several ditches and culverts were identified as needing maintenance.
Of particular concern was a cutoff ditch that had been in place across the top of the reclaimed slope on Benson-
West and WFC(Lloyd)parcels. A rock-lined ditch that carries flow from the cutoff ditch failed due to a
significant storm event prior to the inspection conducted on September 16,2013. The operator was requested to
review this location and if appropriate revise the permit to incorporate ditch designs for the cutoff ditch and lower
rock-lined ditch,which apparently had not been previously incorporated into the permit. The lower portion of the
rock-lined and cutoff ditches were inspected and are shown in Photographs No. 1 and 2 attached at the end of this
inspection report. Other culvert and ditch locations inspected include Ditch C9 and associated culvert(which
clogged during the storm event)that flows to Pond 013 and a temporary collection ditch recently installed at Pond
011 to collect and convey runoff to the pond's inlet in the southwest corner,which breached in several spots
during the storm prior to September l6th. Repairs have been made at Ditch C9 and at the temporary conveyance
ditch at Pond 011. Temporary repairs have been made at the cutoff ditch. Final configuration of this ditch is
Number of Partial Inspection this Fiscal Year: 5
Number of Complete Inspections this Fiscal Year: 1
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