2016-06-15_INSPECTION - C1981012 (3)

Home Browse Search

June 7, 2016 C-1981-012/New Elk Mine RDZ Number of Partial Inspection this Fiscal Year: 10 Number of Complete Inspections this Fiscal Year: 4 Page 4 of 19 On the steep slope to the east of Pond 08 are large bare areas and rills. NECC should consider options for addressing this source of sediment. No problems were seen on the bank between the SAE that includes Topsoil Stockpile #2 and the river. The berm that control runoff from the SAE is intact. However, the soil that was piled on the berm needs to be removed. As it is currently placed, it could slump onto the river bank. The following culverts were found to be large enough (per the Table 21 specifications) and mostly free of sediment: C-B (on RDA road), C4, C12A, C21, C39, and C49. Some issues were identified with culverts: A culvert was found east of the substation (that is south of the office building), but this is not on Map 13. Culvert C-A needs to be cleaned (or did at time of inspection). Culvert C-B is not listed in Table 21. Culvert C11A is on Map 13 but was not found in the field. Culvert C14 is not listed in Table 21. Culvert C23 is mostly free of sediment but is smaller than the specification. Two culverts labeled C52 are shown on Map 14. The one to the west (south of Containment #2) does not appear to exist. The map should be updated. Culvert C64 was almost completely plugged; after the inspection, NECC sent an email to Rob Zuber indicating that the maintenance work had been performed. The following ditches were inspected: D2, D3, D4, D10, D10A, D11, D12, D14, D15, D19, D28, D30, D32, D32A, D39A, D39AA, D55, D56, D57, D61, D62, and D63. The following issues were identified with ditches: Ditch D10A needs to be cleaned to allow for positive drainage and prevent puddles (as is in the ditch now). Ditch D11 is poorly marked on Map 13. It appears to be the channel that drains the SAE that is east of the DWDA#2, but that is not obvious per the map. The channel that drains the SAE that is east of the DWDA#2 (apparently ditch D11) is eroding at the lower end. Ditch D28 is eroding below culvert C49. Also, this ditch is discontinuous, as there is a structure that routes the flow toward the river rather than to the east as shown on the map. Per Ron Thompson, the noted structure is related to the old railroad bed. Finally, this ditch drains to Containment #2, however the map indicates otherwise. Ditch D39A is silted in. It should be cleared or the map and Table 20 should be altered to reflect the ground condition. There are no erosion problems at this ditch near the parking lot and substation. Ditch D39AA was not found in the field. The upper portion of ditch D56 requires maintenance. Ditch D61 appears to be too narrow per the specification in the PAP (Table 20). Ditch D63 requires maintenance. There is no label on Map 14 for the ditch that is east of the two SAEs near the west end of the mine site (formerly the tank pad and substation).