_INSPECTION - C1981012 (8) - Laserfiche WebLink

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January 28, 2013 C-1981-012/New Elk Mine LDS • Downstream of C30, C26 was undersized (the permit specifies 60"diameter). It was also placed in such a way as to form an impoundment(see photo 6). C26 should be removed and replaced with a culvert of the appropriate diameter,with its base at the same level as the channel's thalweg.Alternatively, NECC may decide that it would be preferable,from a long term maintenance perspective,to remove the culvert entirely and restore an open channel; if so,NECC should inform the Division of such intent in writing and the redesign of the channel outlet can be addressed in conjunction with the mid-term review. • The section of concrete culvert in ditch D 14 adjacent to DWDA 2 and north of the river had been removed, and the design capacity of the ditch restored(see photo 7). The location of the water line valve underneath this ditch remains a matter of concern,however, since the line is not currently in use it is not an immediate problem. • The berm on the east side of containment 3 should be restored. • The silt fences at either end of the topsoil SAE should be re-keyed. South of the Purgatoire River: • The area around the Bates portals is currently being re-designed. Mr Thompson plans to allow run-off over the relatively small disturbed area sheet flow(or infiltrate)over a crushed rock surface towards the silos. This run-off will be collected into a culvert on the south of the road which will outlet on the north side of the road. All disturbed area run-off will therefore be conducted along the north side of the road,to pond 7. The Division will review the design when it is submitted as part of a technical revision. • The embankments and spillways of Pond 7 were in good order. Of the two culverts which outlet into pond 7, C32 looked clear but C20 appeared to be partially plugged(see photo 8). Access to the area was difficult and this could have been ice build-up,however NECC should check this culvert and clean if necessary. • The embankments of pond 6 appeared in good order. Pond 6 will be lined in the future to provide process water. There are no surface water structures running into pond 6. • Culvert C17B had been identified as blocked or damaged by Mr Wilson,and removed.NECC was waiting on new culverts to be delivered before it could be replaced(see photo 9). Culvert C17A provides access to the escape hatch,it was clear. C17 was clear at the inlet and outlet. C17C is shown in table 21,but no longer exists on the ground. C17B should be replaced and table 21 should be updated to reflect the removal of C17C as part of the technical revision in response to the mid-term review. • The culverts at the four-way intersection were as before. The outlet of culvert C9 should be cleared. • The flow path from ditch D 13 through to D 15 (and ultimately pond 7)had been temporarily restored by digging a ditch in front of the new pump-house. • On the opposite side of the road,the problems caused by the power pole and the difficult hydraulics through the C 16 system of culverts were still evident,however re-design of the surface water controls in this area are underway. Mr Thompson expects to conduct runoff from ditch D 16 through a new culvert west of the power pole,north under the road to ditch D 15. The Division will review the design when it is submitted as part of a technical revision. • The straw bales on the south bank of the river,under the RDA conveyor should be replaced. • The berm at the east end of the SAE south of pond 7 should be re-built. Number of Partial Inspection this Fiscal Year: 4 Number of Complete Inspections this Fiscal Year: 3 Page 5 of 13