INSPEC01821

• Permit No: C1981020
• IBM Index Class Name: Inspection
• Doc Name: Inspection Report
• Inspection Date: 8/3/2005
• 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.
24-hour storm event. Along the main channel of Munger Creek and its south fork, from upstream of the
mine bench area down to its confluence with East Salt Creek, the channel had been severely scoured,
and the debris line (high water mark) was high up on the sides of the entrenched channel on upland
vegetation such as big sagebrush and juniper. At the 72" haul road culvert on the lower reach of the
main stem of Munger Creek, water had backed up, completely filled the deeply entrenched channel
upstream of the culvert, and flowed over the road, leaving a wide swath of woody debris scattered along
the road and adjacent area. There was minor erosion on the downstream fill slope. It is possible that the
culvert had been partially blocked by limbs and debris during the event, but any such debris had been
flushed out by the flows, and at the time of the inspection the culvert was intact and clear.
When I left the site, the operator was preparing to set up a pump to begin dewatering the coal waste
area sediment pond. Discharge will be monitored and reported in compliance with CDPS permit
requirements.
Remedial measures to be implemented promptly, with no requirement for permitting actions include:
Initiate and complete pumping to dewater the pond and provide water storage capacity for the
short term.
Dig out the 36" CMP inlet and clean out the culvert to restore it to design capacity.
Measures to be addressed in a minor revision application to be submitted by August 12, 2005:
Estimate quantity of sediment to be removed from the pond, and prepare a plan for clean-out,
handling, interim storage (if warranted), and final placement of the pond sediment. Include a map
or sketch delineating the designated placement area(s), narrative addressing appropriate site
preparation, placement, interim stabilization and long term reclamation measures, and a schedule
for initiation and completion of the pond clean-out project (including clean-out/repair of the
existing primary spillway pipe).
Measures to be addressed in a technical revision application to be submitted by September 6, 2005:
Provide an estimate of the storm event magnitude within the Munger/Watershed "F" watersheds,
based on available weather records for locations in the general vicinity of the permit area (BLM,
NOAA, NWS, State Climatologist, etc.), as well as flow levels in Munger Creek relative to
surveyed 50 and 100 year flood level elevations.
Provide a plan for clean-out, placement, and stabilization of sediment and rock from the lower
segment of the Watershed "F" drainage channel. Include appropriate narrative and amended
facility area mapping to define the channel segment to be cleaned out, final profile and
dimensions along the affected segment (to approximate original channel dimensions and grade),
and stabilization/reclamation measures to be applied to the areas affected by the channel
excavation and material placement. Use of material from the channel clean-out to build up a large
berm between the drainage channel and the sediment pond is recommended (berm height and
dimensions should be specified in the plan).
3. Include documentation of correspondence with the Army Corps of Engineers, and any required
Army Corps permit approval to allow for the channel excavation project.
4