_INSPECTION - C1981019 (29) - Laserfiche WebLink

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January 20,2011 C-1981-019/Colowyo Coal Mine JRS 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: -The West Taylor Pond(NPDESO1 IA)contained water at a level approximately four feet below the top of the primary riser. It was unclear whether the pond was discharging when the photographs were taken. The top of the pond(water)was mostly covered with ice and snow. The emergency spillway appeared to be stable. The pond embankment was covered with snow but also appeared to be stable. -The East Taylor Pond(NPDES Ol OA)contained water approximately six feet below the top of the primary riser and did not appear to be discharging(as evidenced by the fact that there was snow in the discharge culvert on the downstream side of the pond embankment). The pond embankment was covered with snow but appeared to be stable. GENERAL MINE PLAN COMPLANCE: -The aerial inspection took place on a Thursday,which is the day the mine does not operate(it is a maintenance day). The 114 shovel and 115 excavator were both in the south part of the South Taylor Pit but not operating. All of the 240-ton haul trucks were parked in the South Taylor ready line. The 102 and 103 draglines were both in the West Pit. ROADS—Rule 4.03 Construction 4.03.1(3)/4.03.2(3)Drainage 4.03.1(4)/4.03.2(4) Surfacing and Maintenance4.03.1(5)and(6)/4.03.2(5)and(6)Reclamation 4.03.1(7)/4.03.2(7): -The South Taylor Haul Road was plowed from the West Pit up to the South Taylor Pit and from the facilities area into the West Pit. There was a stretch of road in the West Pit that was not plowed. The haul road appeared to be stable and well maintained. SUPPORT FACILITIES-Rule 4.04: -The Gossard Loadout area appeared to be in good condition at the time of the inspection. There coal stockpiles at the loadout cone and just south of the truck dump appeared to be very large. There was no fugitive dust seen blowing from the loadout. -Colowyo still has the rock crusher placed on the A-A' underdrain of the West Taylor Fill(almost at the confluence with the B-B'underdrain). The rock crusher is used to crush rock for the haul roads. DOCUMENTS RECEIVED: Aerial Inspection—N/A This concludes the Division's 20 January 2011 aerial inspection for the Colowyo Mine. Number of Partial Inspection this Fiscal Year: 7 Number of Complete Inspections this Fiscal Year: 2 Page 3 of 6