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November 16,2022 C-1981-019/Colowyo Coal Mine ZTT <br /> On October 2,2022,an intense storm event dropped approximately 0.86 inches in 3 hrs, 0.6 inches of that in an <br /> hour. This storm event impacted the Final East Pit Ditch and South Collection Ditch which allowed disturbed <br /> runoff to leave the site. For more information regarding this event,please refer to the Division's inspection report <br /> dated October 4,2022.The entire length of the Final East Pit Ditch was inspected. The associated stock tank EP1 <br /> has been cleaned of sediment. The sediment has been stacked within the embankment of the stock tank to allow <br /> for drying before being trucked off once ground conditions allow.The ditch itself has not yet received <br /> maintenance due to ground conditions. Recent weather and snow has prevented Colowyo from getting equipment <br /> to the area to reconstruct the ditch. Once weather and ground conditions allow,Colowyo will mobilize equipment <br /> to the area for maintenance. While the ditch is in need of repair,all disturbed runoff is still directed properly to <br /> South Collection Ditch and Prospect Pond.The South Collection Ditch has been repaired.The ditch has been <br /> removed of all sediment and rocks that had deposited within the channel during the October storm event. <br /> Additional freeboard has been added to the ditch to ensure future runoff stays within the channel.The North Trib. <br /> East Pit Ditch was also inspected. This ditch was unimpacted by the October storm event and remains stable. <br /> All Collom Ditches were inspected. This includes D1,D2,D3,and D4(formally D6). Each ditch was inspected. <br /> Ditches D1,D2 and D3 are all armored with rip rap while D4 is approved as a bare channel.No erosion or issues <br /> were observed. <br /> . t 'o Pf <br /> .s - • <br /> r„ g. <br /> .4 <br /> South Collection Ditch maintenance. EP1. <br /> Ponds <br /> Due to ground conditions and limited accessibility, some ponds were not inspected. This included Section 16, <br /> Section 28,West Taylor,East Taylor and West Pit Pond. <br /> Ponds associated with the East Pit are Streeter Pond and Prospect Pond.The Streeter Pond receives runoff <br /> associated with the Streeter Ditch.The pond held water and was discharging at the time of the inspection. The <br /> embankment was stable and well vegetated. The Prospect Pond receives runoff from the Final East Pit Ditch, <br /> Number of Partial Inspection this Fiscal Year: 3 <br /> Number of Complete Inspections this Fiscal Year: 2 <br /> Page 4 of 8 <br />