2014-05-12_INSPECTION - C1994082 (2)

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April 24, 2014 C- 1994- 082/Yoast Mine JHB A 2.5" diameter PVS monitoring well was observed on the south side of Pond 10. This well is capped but no identification was written on the PVC, Pond 11A contained a full pool of cloudy water. Pond 11A was discharging. An additional water source was observed emerging from below Pond 11A embankment. This source was located approximately 25 feet east of the primary discharge structure. The water was much clearer than the water discharging through the pond spillway. There was no evidence of embankment instability on Pond 11A. (photo 7) There was no gully formation east (downslope) from this spring. This spring will eventually drain to Pond 11. The inlet of Pond 11A is side - cutting and needs maintenance to reduce additional damage. (photo 6) YPM -9 has experienced some down - cutting and fabric damage at the east end of this permanent drainage. (photo 8) There was some down - cutting on the east extent (top of drainage) of YPM -10. This down- cutting is of short extent and does not continue downslope. YPM -24 appeared to be holding up well. No problems were noted with this drainage. The majority of YPM -20 was holding up well. A portion of this drainage between SP07 -1 and LU3A needs repair. YPM -8 has been repaired, and a stock tank installed west of LU3 -A. The fabric in YPM -8 downslope from LU3 - A is holding up well with no down- cutting or undercutting. A snowdrift was obscuring the lower reaches of this drainage. Vegetation is growing through the fabric and stabilizing this drainage. On the west side of LU3 -A crossing of YPM -8 the runoff flow was side - cutting. (Photo 11) SCC will need to stabilize this bank to reduce continued side - cutting. The erosion control fabric at this road crossing is torn up and will require repair. This location may be a candidate for a rocked "California" crossing. This newly constructed stocktank at YPM -8 and LU3 -A is only holding a small puddle and not holding a significant pool of water at the time of the inspection. ST1 -1 was functioning well and was discharging into YPM -1 -2. The gabion on the upstream side of ST1 -1 was still covered by a snowdrift. (Photo 12) The inspector walked along YPM 1 -2 from south to north. Some channeling was observed along the channel repair access track. This "track" has been regraded but it was uncertain if it had been reseeded. (Photo 13) SCC will need to monitor this repair area and mitigate if vegetation does not fill in. Gabions along YPM -1 -2 were holding up well. YPM -18 meets the permanent drainage, and the joined permanent drainage continues as YPM -1- 3. The junction with YPM -18 held up well and the rock check dam continues to function well. (Photo 14) The southern end of YPM -1 -3 fabric is pushed up but the flow is not undercutting and seems to continue to function. Number of Partial Inspection this Fiscal Year: 8 Number of Complete Inspections this Fiscal Year: 3 Page 3 of 10