_INSPECTION - C1981017 ‎(3)‎

• Permit No: C1981017
• IBM Index Class Name: Inspection
• Doc Name: Inspection Report
• From: DRMS
• To: Revoked
• Inspection Date: 9/12/2012
• Email Name: SB1
• Media Type: D
• Archive: No

September 12, 2012 C-1981-017/Coal Basin Mines BFB
BACKFILL and GRADING—Rule 4.14
Contemporaneous Reclamation 4.14.1; Approximate Original Contour 4.14.2; Highwall Elimination 4.14.1(2)(f);
Steep Slopes 4.14.2, 4.27;Handling of Acid and Toxic Materials 4.14.3; Stabilization of Rills and Gullies 4.14.6:
There was some slumping at the toe of the Sutey Pile on the south side where the culvert crosses under the road
(photo 1). This slide occurred prior to the Division initiating reclamation of the Sutey in 1995, at a portion of the
facility reclaimed by Mid-Continent Resouces. It appears that subsurface drainage through a portion of the facility
is the cause of this small failure. The slump does not appear to have reactivated in recent years. Ditch 8,near the
southeast margin of the facility, continues to be somewhat problematic. Although marginally stable,portions of
the ditch have suffered from undercutting due to high flow velocities. Runoff from the Sutey refuse pile continues
to pass through two sediment ponds prior to discharging to Coal Creek.
Some gullies have formed in the fill on the outslope of Road C below the Mine 4 bench(photo 2). The degree of
outslope erosion has been significantly reduced as a result of reclamation efforts, as indicated by the presence of
only two or three active erosional features and the relatively successful establishment of vegetation on the east and
north facing slopes of the mine 4 bench. Prior to reclamation,numerous active gullies were present on these fill
slopes,which, at that time,were largely devoid of vegetation.
A portion of Road B that was impacted by the landslide originating from Road D,was being surveyed by the
Forest Service. The Forest Service plans to install a sediment retention facility in Road B to catch any continued
sediment movement from the landslide before it reaches Dutch Creek. As part of this work,the Forest Service
intends to heavily amend the re-disturbed area with blended compost and biochar to enhance soil organic materials
and increase moisture rentention capabilities. The Forest Service indicates that they will disturb about 1/4 to '/2 acre
of previously reclaimed areas in order to complete their construction work,which was scheduled to begin
September 17.
HYDROLOGIC BALANCE -Rule 4.05
Drainage Control 4.05.1, 4.05.2, 4.053; 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:
The Road G crossing at Oil Well Creek was washed out, likely as a result of intense monsoonal moisture. A large
head cut(approximately 12 feet high)continues to establish itself in the unconsolidated alluvial material which
characterizes the vicinity of the road crossing. As a result of this and previous events which have occurred over
the past ten years, the crossing is passable only on foot(photo 3). At the bottom of the headcut a previously
unknown culvert was exposed (photo 4)at the base of Oil Well Creek. The culvert is full of cobble and other
alluvium, and serves no function.
Three ponds located near the former location of the Mine 2 Training Center contained water,and were not
discharging. Containment berms at each appeared to be stable.
Number of Partial Inspection this Fiscal Year: 1
Number of Complete Inspections this Fiscal Year: 1
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