_INSPECTION - C1981035

• Permit No: C1981035
• IBM Index Class Name: Inspection
• Doc Name: Inspection Report
• From: DRMS
• To: Tom Bird
• Inspection Date: 9/23/2013
• Email Name: MLT
• Email Name: SB1
• Media Type: D
• Archive: No

September 23,2013 C-1981-035/King Coal Mine MLT
• The King Coal Mine has received above-average amounts of precipitation during the 2013
monsoon season. Records are kept by Tom Bird, and he provided the following monthly
totals: July - 3.86"; August- 4.75"; September- 6.47" (to date).
• Selected events: Aug. 19 - 0.35" in 1 hour; Aug. 29 - 0.4" in 45 minutes; Aug. 30 - 1.1";
Sept. 9 - 1.1"; Sept. 22 - 1.1".
Ki'n2 I
• The West sedimentation pond was holding water,with a level well below that at which
overflow to the East pond will occur (Photo 2). The dam and emergency spillway were in
good condition, with no evidence of instability.
• The East pond also held water. The emergency spillway was overgrown with weeds, mainly
Kochia, which must be removed as soon as possible. The embankment appeared to be well
vegetated and stable.
• The King I sedimentation control system is illustrated on Map King I-007. It appeared that
the system had functioned well with the recent storm events. The drop inlet at the junction of
Reaches 3 and 7 was covered with about two inches of sediment,which Mr. Wymore cleared
during the inspection. The other inlets were clear.
• The final ditch Reach that drops into the West Pond from the south is deep, steep, and
pinched between the hillside and the parking lot (Photo 3). It is therefore difficult to tell
whether any recent erosion has occurred there, but the ditch appears to be functioning
satisfactorily.
Ki'n211
• The King 11 Sedimentation Control System is depicted on the Map King 11-007 series (A thru
G). Design details are found in Appendix 11 of the permit.
• We checked each of the manholes (drop inlets) and found them to be clear of sediment and
debris. Each is protected by a ring of riprap, straw wattles, or both. Culvert inlets were also
clear and protected.
• The West Clearwater Diversion Ditch (WCDD)is lined with riprap from the outlet of the 24"
black corrugated polyethylene pipe to culvert C3, which carries the flow beneath the haul
road just downstream of the sediment pond.
• The upstream segment of the WCDD has a steeper gradient, and appears to have handled the
recent flows without incident (Photo 4). Once the ditch flattens out, the flow capacity may
have been somewhat reduced by an accumulation of sediment (Photo 5). The cross section
of the WCDD should be maintained to the dimensions shown in Detail 4 on Map King II-
007A to ensure that it continues to function as designed.
• For the unlined portions of the WCDD (Ditches A and B), we could see that over the
weekend, during the rain event, an employee had placed rock at numerous places along the
ditch to function as check dams, slowing the velocity of the water.
• Upper portions of the East Clearwater Diversion Ditch (ECDD)had been cleared of
vegetation. The segment immediately east of the sediment pond was overgrown with large
annual weeds, especially Kochia. Mr. Wymore said that weed removal activities are ongoing
at the site.
Number of Partial Inspection this Fiscal Year: 2
Number of Complete Inspections this Fiscal Year: I Page 3 of 8