_INSPECTION - C1980005 ‎(9)‎

• Permit No: C1980005
• IBM Index Class Name: INSPECTION
• Doc Name: Inspection Report
• Inspection Date: 7/14/2009
• Email Name: DTM
• Media Type: D
• Archive: No

III. COMMENTS-COMPLIANCE
Below are comments on the inspection. The comments include discussion of observations made during the
inspection. Comments also describe any enforcement actions taken during the inspection and the facts or
evidence supporting the enforcement action.
design grade(9%measured vs. 4.3% design), and has eroded approximately 1 foot deep (Photo #
449). The eroded segment of Ditch V-3 will need to be graded and properly stabilized with
TRM or riprap prior to approval of SL-4 bond release.
Postmine Channel PM-8 appears to have been constructed in accordance with approved gradient
specifications, with proper riprap placement along most of the length of the channel, and proper
TRM installation along the upper-most extension(constructed in the fall of 2007). Channel
capacity appeared to meet design requirements in all segments, and in most segments the
capacity significantly exceeded design specifications. Typical segments are depicted in Photo
#447,#448, #458, and#463. One problem location was observed with respect to PM-8
construction and functioning, which will need to be repaired prior to Phase 1 bond release
approval. The segment of concern is approximately 50 feet in length, and is located upstream of
the Ditch V-4 junction. Along the segment, flow appears to have diverted to the outside edge of
the riprap along the left(east)bank, cutting into the bank and resulting in a vertical side-slope
12"to 18" in height. Photo #453 is a distant view of the eroded segment. Photos #456 and
#457 are views up the ditch along the eroded segment. The eroded segment of Channel PM-8
will need to be properly regraded and riprap will need to be replaced, extending up the
ditch side-slope,to prevent recurrence of the side-scour. The repair will need to be
completed prior to approval of SL-4 bond release.
Solid Waste Disposal Site
The second area included in the SL-4 release request is the 8 acre Solid Waste Disposal (landfill)
site, located in the upper-most reach of the PM-10 drainage. Channel PM-10 drains north from a
drainage divide that separates the Pond 002 and Pond 004 watersheds. Runoff from the site is
ultimately routed through Sediment Pond/Permanent Impoundment 002 before discharge from
the permit area. The site was the end area of a final pit location that was permitted for solid
waste disposal and kept open for such use during mine operations. It was not included in SCC's
SL-1 bond release application in 2006,because grading had not been completed at that time.
Backfilling of the pit and regrading was completed in 2007 and portions of the area were
topsoiled and seeded. Remaining portions of the site were topsoiled and seeded in the fall of
2008. Photo #HBR0043 attached to this report is an aerial view of the site as it appeared in
October 2008. Photo #'s 466 through 470 are from the 7/14/09 SL-4 site inspection.
A gully was observed on a short,relatively steep grade at the lower end of the reclaimed landfill
site during the Division's 6/16/09 site inspection. The gully was subsequently repaired by the
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