2013-01-29_PERMIT FILE - C1981022A (3)

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Slime ~ 2.05.4 neaz-surface materiak during construction of the Lower Hubbard Creek ponal bench. The surficial • materials exposed following regrading operations included mixed soils and weathered surficial and near-surface materials. These materials were determined to be suitable as revegetatton growth medium and Gave been effective to date in supporting effective vegetative reestablishment. Revegetation - In accordance with an agreement with the DMG, a vegetation study was conducted for the Bear Creek and Hubbard Creek disturbance areas and adjacent undisturbed areas during the sununer of 1981. The results of this study are snmm~ri~rd in Exhibit 2.04-E6, Vegetation Information, and graphically illustrated on Map 2.04-M8, Regional Vegetation. A revegetation plan, based on the study results, is included in the vegetation study report in Exhibit 2.05-E6. Disturbed and reclaimed areas were prepared and reseeded in 1995-1996 consistent with the approved revegetation plan. Reclaration Schedule -The following sununarizxs the timing of reclamation activities that have or will occur for the Lower Hubbard Creek facilities area. 1994 -The above ground facilities, including the concrete foundations, were demolished and resulting demolition debris either removed from the site for disposal or buried in the fill. Excavated material was placed against the limited steep slope areas. 1995-1996 -Final grading was completed and the area was prepared for seeding, fertilized, and seeded in accordance with the revegetation plan outlined in Exhibit 2.04- E6, Vegetation Information. Recluna[ion Costs - A summary of estimated cosu for complete reclamation of the Lower Hubbard Creek facilities area is provided in Exhibit 2.03-E3, Insurance and Bonding Information. • Uuoer Hubbard Creek Atea (Somerset Mined -The actual constructed Upper Hubbard Creek facilities included the facihties pad, substation, powerline, sedimentation pond, and ground water monitoring well H 10. A ventilation installation (shaft and fan installation) is approved for this site but was never constructed. The Upper Hubbard Creek facilities area may be utilized in the futtrte in conjunction with mining in the Elk Creek Mme but there are no current plans for further development, constmcrion, or use for this site. The area has been stabilized but not fully reclaimed and does not represent an environrrtental hazard. Demolition and Final Grading -The limited above-ground structures were dismantled and removed, leaving only the substation foundation pad, powerline, and ground water monitoring well H-10. The disturbed area is stable in its present configuration and surface materiak have been stabilized to min;m;~r erosion by planting a temporary vegetative cover. In order to protect the site and minimi~a sedimentation until final reclamation is completed, drainage and sediment control is provided by a small sedimentation pond for the pad area, diversion ditches that intercept runoff and direct it around the disturbed area, and a small area exemption and silt fence for the pad outslope and soil stockpile. At such time as this area is no longer needed to support ongoing or future mining operations, the site will be reclaimed to provide a trailhead area for the U.S. Forest Service. The portion of the pad located on OMI propertywill be reconfigured as part of the Hubbard Creek road to provide access to the remainder of the pad area, which u on public land. The disturbed area will be graded to the final configuration shown on by the Hubbanf Creek reclamation plan drawings in Exhibit 2.05-E5, Reclamation Details. The graded cut and fill material will be compacted as necessary by grading equipment to establish stable final slopes. The portion of the pad that u on pubhc land will be retained to provide a parking and [railhead area for access to surrounding pubhc lands. A leuer from • the U.S. Forest Service requesting and approving this postmining use is included in Exhibit 2.05-E5, Reclamation Details. As pan of the site reclamation agreement and in consideration of existing natural geologic instability along the access road and in the general area, the U.S. Forest Service will post IandsGde-wanting signs. PR04 2.05-54 Revised August 2000