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September 11, 2023 C-1981-019/Colowyo Coal Mine ZTT <br /> <br /> <br />Number of Partial Inspection this Fiscal Year: 3 <br />Number of Complete Inspections this Fiscal Year: 1 <br /> <br /> Page 5 of 10 <br /> <br /> <br />The West Pit Pond and East Taylor Pond are associated with the West Pit and were inspected. The West Pit Pond <br />was dry and the East Taylor Pond held water and was discharging at the time of the inspection. Most of the water <br />received from the East Taylor Pond comes from a spoil spring located just above the pond. The spring has been <br />intercepted by a french drain which diverts the water to a flume where flow can be measured. Water elevations <br />within the pond were high. Based on discussions with the mine representative, aquatic vegetation overgrowth has <br />partially clog the primary spillway. To ensure proper function of the spillway, the vegetation will need to be <br />removed. The mine representative stated the vegetation will be removed as soon as possible. <br /> <br />East Taylor Pond. <br />South Taylor Pit: <br /> <br />Four ditches associated with the South Taylor Pit were inspected. This included West Fork Taylor Ditch, East <br />Fork Taylor Ditch, Section 28 Ditch and Section 29 Ditch. Both West and East Fork Taylor Ditches are partially <br />constructed and only accept drainages from the West Taylor Fill currently. The ditches are heavily armored with <br />rip rap with no issues. Both Section 28 and 29 Ditches receive runoff from disturbance associated with the crest of <br />the southern highwall of the South Taylor Pit. The Section 28 ditch was walked along its entire length until it <br />drops off into native drainages. All ditches inspected associated with the South Taylor Pit were stable with no <br />issues. <br /> <br />The West Taylor Pond located below the Taylor Fill held water at the time of the inspection. The majority of the <br />water received at the West Taylor Pond comes from water intercepted by the underdrain of the fill and was <br />discharging. The pond embankment was well vegetated and stable. Section 28 Pond was also inspected. This pond <br />was dry with no issues. <br /> <br />Collom Pit: <br /> <br />Collom currently has five ditches constructed; D1, D2, D3, and D6. Each ditch was inspected. Ditches D1, D2 and