_INSPECTION - C1982057 (50) - Laserfiche WebLink

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September 21,2010 C-1982-057/Seneca II-W Mine JRS C:� Close monitoring of these surge ponds and maintenance work as necessary will be needed to ensure the ponds and their associated post-mining channels remain stable. The Division is requesting that the location of these surge ponds be depicted on the as-built exhibit for the post-mining drainage channels for SL-03 (Exhibit D). Please update SL-03 Exhibit D to show the locations of the surge ponds,as appropriate,in the post-mining channels. - Stock Tanks—Seneca has three stock tanks in the Seneca II-W Mine South area. The stock tanks are T-25,T-26 and T-27. As with the surge ponds discussed above,there was erosion at both the inlet and outfall sides of these stock tanks. Seneca was repairing some of the erosion problems on the stock tanks in the PM-2 drainage area at the time of the inspection(T-26 and T-27). Seneca will need to continue to closely monitor these stock tanks and repair any problems as necessary. The Division will update task 118 of the reclamation cost estimate to account for maintenance of these stock tanks at the Seneca II-W Mine. Since these stock tanks are in the permanent, post-mining drainage channels,their location should be depicted on the as-built exhibit for the post-mining drainage channels for SL-03 (Exhibit D). Please update SL-03 Exhibit D to show the locations of the stock tanks,as appropriate,in the post-mining channels. -Pond 016A was discharging over the spillway into Pond 016. The discharge looked clear. Pond 016 was also discharging into the receiving stream. The discharge from Pond 016 also appeared to be clear. Both pond embankments were well vegetated and stable and no erosional problems were noted. -Pond 017 was discharging a trickle at the time of the inspection. The discharge looked clear. The pond embankment was well vegetated and stable and no erosional problems were noted. ROADS—Rule 4.03 Construction 4.03.1(3)/4.03.2(3)Drainage 4.03.1(4)/4.03.2(4) Surfacing and Maintenance4.03.1(5) and(6)/4.03.2(5) and(6)Reclamation 4.03.1(7)/4.03.2(7): -Haul Road I has been reclaimed and is included in the Partial Phase I Bond Release SL-03. The road has been regraded to blend with the surrounding ground and has been topsoiled and reseeded. The reclaimed haul road corridor was stable and had good vegetative cover. There were Canadian thistle patches along the entire length of the reclaimed haul road corridor. The I-1 culvert was excluded from the Partial Phase I Bond Release SL-02 because it was still in place at the intersection of Haul Road I and reclaimed Haul Road H. Seneca crushed the ends of the I-1 culvert and covered them with material and graded the area to blend in with the surrounding area. -Haul Road J is a primary access road for Seneca and the landowners. The road has been narrowed to a width of approximately 20 feet. The remaining width of the haul road has been graded to blend with the surrounding ground. The reclaimed portions of the haul road are well vegetated and stable. There was some Canadian thistle noted on the slopes between culverts J-6 and J-7 which will need to be treated and possibly reseeded. All of the remaining culverts were clear at the time of the inspection. There are some maintenance issues that need to be addressed, as follows. Both the inlet and outlet sides of culvert J-3 were down cut and need to be repaired. There was some sediment at the outlet side of culvert J-4 that will need to be cleaned to allow water and sediment to flow out of the culvert. The TRM at the outlet side of culvert J-5 needs to be repaired. All of the culvert areas have silt fence and straw waddles that are in place to help prevent sediment from getting into undisturbed areas. All of these silt fences and straw waddles were near capacity will need to be excavated repaired/replaced. -Haul Road K is also a primary access for Seneca and the landowners. The road has been narrowed to a width of approximately 20 feet. The remaining width of the haul road has been graded to blend the surrounding area. All of the cut and fill slopes blend in well with the existing ground surface. The reclaimed areas of Haul Road K were well vegetated and stable at the time of the inspection. There were numerous Canadian and Bull thistle patches along the entire reclaimed Haul Road K corridor,including one very large patch at the curve just north of Pond Number of Partial Inspection this Fiscal Year: 3 Number of Complete Inspections this Fiscal Year: 2 Page 10 of 18