2024-11-13_INSPECTION - C1981018

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November 7, 2024 C-1981-018/Deserado Mine TJ1 Number of Partial Inspection this Fiscal Year: 3 Number of Complete Inspections this Fiscal Year: 2 Page 3 of 14 seen under the conveyor where it intersects with County Road 65. 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: There are three ponds located in the main facilities area: the DP-1 Pond, the PP-1 Pond and the PP-2 Pond. The DP-1 Pond is located on the southern part of the lower facilities bench. DP-1 collects all runoff from the from the three facilities benches. The outlet structure was clear of debris and the pond was discharging at the time of inspection. The embankments appear stable with well-established vegetative cover (Photo 3). The emergency spillway has minor amounts of vegetation, but still appears to be able to convey water and is well armored. There were no erosional concerns identified. The PP-1 Pond is located on the middle bench of the facilities area near the prep plant. The pond was partially frozen and below the discharge level (Photo 4). There were no erosion or stability issues identified in the PP-1 Pond. The PP-2 Pond is located on the upper facilities bench. This pond was partially frozen. The outlet structure was in good condition with no vegetation obscuring the outlet (Photo 5). Water diversion ditches throughout the main facilities area were unobstructed and stable. The B Seam Dewatering System No. 1 was active during the inspection. Cells were impounding water. There was well established vegetation on the embankments of the cells. The cells were stable with no erosional or other stability features noted. The Last Chance Pond was discharging approximately 20-25gpm at the time of the inspection (Photo 6). The B-Seam Dewatering System No. 2 was not active at the time of the inspection. The upper pond contained water but is below the discharge level. The lower pond was also holding water and below the level of discharge. The SDH#3 (D-Seam) dewatering system was active at the time of the inspection and discharging at a rate of approximately 300 GPM. Water is being placed in the lower cell of the system (Photo 7) and the upper cells are not in use. The pad where the pump is located is in good condition with no signs of instability. The SS-2 Pond is located at the northwestern base of the Slot Storage Facility. The pond was dry at the time of the inspection. The embankments of the pond were well vegetated and stable with no indications of erosion. The RS-1 Sump and the RR-1 Pond are located at the south side of the Rail Loadout. The RS-1 Sump was dry and stable. There were no indications of erosion. The RR-1 Pond was also dry. The embankments of the pond seem stable. The erosion feature on the northern embankment that has been noted in previous inspection reports does not appear to have grown in size (Photo 8). The Rail Loadout Storage South Ditch is able to convey water and does not appear obstructed. Pond RP-1 is located at the base of the reclaimed RP-1 Refuse Pile. The pond was dry at the time of the inspection. The embankments of the pond were stable with no indications of erosion observed. There were no obstructions in the outlet - the trash rack over the pond’s outlet was clean. Two ponds are located at the northern base of Refuse Pile RP-2/3/4. The RP -2/3 Pond is located on the pile’s northeast corner. The Pond consists of three cells – the upper cells were holding water at the time of the inspection (Photo 9). The channels above the ponds appear clear of debris. No erosional features were noted on the