_INSPECTION - C1981018 (57) - Laserfiche WebLink

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August 18,2011 C-1981-018/Deserado Mine JRS 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: -The reclaimed East Portal area(including the haul/access road corridor,portal area and drainages)was stable and well vegetated at the time of the inspection. The entire area has held up well over the years. There were no signs of settling, cracking or slumping in the backfill. There were a few small rills that have developed in the east portion of the reclaimed road(closest to Rio Blanco County Road 65)but they do not appear to be getting any larger. The Division will continue to monitor these rills and determine if,at a later date,remedial action in necessary. At this point,however,the Division does not believe that any action is necessary. 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: -Pond RP-1 was dry at the time of the inspection. The pond embankment was well vegetated and stable and no erosional problems were noted. -Pond RP-2/3 was muddy in the bottom at the time of the inspection. The two presettling cells in the pond contained some water but were not discharging into the main pond. The pond embankment was well vegetated and stable and no erosional problems were noted. -Pond RP-4 contained a small amount of water but was almost dry. The pond embankment was well vegetated and stable and no erosional problems were noted at the time of the inspection. -Pond RP-5a contained water approximately three feet below the spillway and was not discharging at the time of the inspection. The pond embankment was well vegetated and stable and no erosional problems were noted. . -Pond DP-1 contained water approximately two feet below the discharge pipe and was not discharging at the time of the inspection. There is some sediment at the inlet of the pond and a fair number of cattails in the pond. The pond embankment was well vegetated and stable and no erosional problems were noted. The emergency spillway is a riprapped,open channel,which appeared to be stable. -Pond SS-1 was basically dry at the time of the inspection(there was a bit of mud in the pond). The sump before the culvert that runs to the pond was recently cleaned out. Pond SS-2 was dry at the time of the inspection. The pond embankments were well vegetated and stable and no erosional problems were noted. -Pond RR-1 and sump RRS-1 (below the loadout)were both dry at the time of the inspection. The embankments were well vegetated and stable and no erosional problems were noted. -The post-mining drainage channels at the reclaimed East Portal location were all stable at the time of the inspection. Over the years these riprapped ditches have become well vegetated and appear to be stable for the long-term. -The roadside ditch between the haul road and access road still needs to be cleaned. Sediment has built up behind straw bales and the drop structures along the road. The rest of the ditches along the haul road(to the refuse pile, north of Rio Blanco County Road 65)were clean. -The roadside ditches along the conveyor corridor were clean and appeared to be stable. Number of Partial Inspection this Fiscal Year: 1 Number of Complete Inspections this Fiscal Year: 1 Page 3 of 22