Laserfiche WebLink
May 10,2022 C-1981-019/Colowyo Coal Mine ZTT <br /> HYDROLOGIC BALANCE -Rule 4.05 <br /> 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; <br /> Diversions 4.05.4;Effluent Limits 4.05.2; Ground Water Monitoring 4.05.13; Surface Water Monitoring 4.05.13; <br /> Drainage —Acid and Toxic Materials 4.05.8;Impoundments 4.05.6,4.05.9; Stream Buffer Zones 4.05.18: <br /> East Pit: <br /> All remaining ditches within the East Pit were inspected along with their associated stock tanks. This includes the <br /> Final East Pit Ditch(FEPD),North Tributary,East Pit Ditch(NTEPD), Prospect Ditch and the Streeter Ditch. <br /> Each ditch was stable at the time of the inspection.All ditches were either well vegetated or lined with rip rap. <br /> Only the FEPD had active flow during the inspection.All associated tanks held water with no discharge into their <br /> associated ditch.No issues observed. <br /> Ponds associated with the East Pit are Streeter Pond and Prospect Ditch.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 Ditch receives runoff from the FEPD,NTEPD and <br /> Prospect Ditches.The Prospect Ditch held water but was not discharging at the time of the inspection.The pond <br /> has recently received maintenance with the primary outlet in 2022 and the primary discharge pipe in 2021. The <br /> primary outlet received a new trash and anti-vortex rack to ensure proper flow within the outlet. In 2021 the <br /> primary discharge pipe was replaced. This required the embankment to be excavated to access the old pipe and <br /> install the new pipe. The embankment area that was disturbed has limited vegetation establishment but has been <br /> reseeded.A silt fence has been placed below the disturbance of the embankment but is not currently keyed into the <br /> ground leaving a gap between the fence and the surface.No erosion or sediment leaving site was observed. <br /> fw _ <br /> X S� <br /> E <br /> Streeter Pond. Silt fence at Prospect Pond. <br /> West Pit: <br /> Four ditches within the West Pit were inspected along with the associated stock tanks. This included the Taylor <br /> Number of Partial Inspection this Fiscal Year: 8 <br /> Number of Complete Inspections this Fiscal Year: 4 <br /> Page 4 of 11 <br />