_INSPECTION - C1981019 (34) - Laserfiche WebLink

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Colowyo C-1981-019 18 March 2009 Pg 5/7 -nOC�" Hydrologic Balance (cont.): - Culvert D was clean at the time of the inspection. - Culvert C contained a small amount of sediment at the time of the inspection. This culvert is larger than required and still maintains its required diameter. - Culvert B was clean at the time of the inspection. - Culvert M contained a small amount of sediment at the time of the inspection. This culvert is larger than required and still maintains its required diameter. The presump before the inlet of culvert M is full and should be cleaned, as this culvert fills up regularly. - Culvert L was clean at the time of the inspection. - Culvert K was clean at the time of the inspection. This is one of the culverts that routinely fills with sediment. The presump before the inlet of culvert K was clean. - Culvert P contained a small amount of sediment at the time of the inspection. This culvert is larger than required and still maintains its required 12" diameter. The presump before the inlet of culvert P is almost full and should be cleaned. - Culvert J was clean at the time of the inspection. - Culvert H was clean at the time of the inspection. - Culvert G was clean at the time of the inspection. - The roadside ditches along the paved access and haul road were all clean at the time of the inspection. There were no erosional problems noted in any of these ditches. Backfilling and Grading: - Colowyo has committed to provide two reclamation schedules for the East Pit closure. The first plan is a short term plan that will encompass the area around the Prospect ditch, including the sump area that is part of the ditch which is not yet to final grade. This short term plan, in the form of a Technical Revision JR-78), was received by the Division on 24 December 2008. The Division has sent Colowyo a preliminary adequacy Letter on this revision. This revision will be completed following the Division's approval of TR-73 as discussed above. The second plan is a long term plan that will provide a comprehensive reclamation schedule for the remaining East Pit, including the closure of the final pit. This long term plan is due to the Division no later than 31 March 2009. - Colowyo has been performing some reclamation work with the 101 dragline on the highwall of the East Pit (although it was not operating at the time of the inspection). The dragline does appear to have moved additional material since the last inspection. - The operator is performing backfilling operations in the northwest corner of Section 4 area of the West Pit (although there was no active work being performed at the time of the inspection). The backfilled area has almost reached the East Taylor Pond and appears to have reached its farthest extent at this point (although it will need to be sloped to the pond). A very small portion of the area has reached final contour. Colowyo has blocked-off the entire area south of where this backfilling is taking place (to keep water out of the area) and has some small dumps in the draw that will eventually be covered as the area is further backfilled. No other backfilling operations were being performed in the West Pit.