2010-11-10_REVISION - M1981185 - Laserfiche WebLink

Home Browse Search

May Day and Idaho Mine Complex 112 (d) Permit Application Within the augmentation pond at the Idaho Operational Area prior to reclamation, fresh water will be dis- charged to an adjacent drainage channel or spray irrigated on the ground in accordance with CDPHE dis- charge permit requirements. Upon closure, the augmentation ponds will be backfilled, and graded to blend with the existing topography. Slopes will be equal to or less than 2(H): I (V). Standard revegetation method will then be implemented (Section 6.4.5(2) (d)). After clean up and earthmoving, final revegetation will be conducted as identified in Section 6.4.5(2) (d) and (f). Pre-existing Access Roads :Pre-existing access and exploration roads will not be reclaimed or revegetated (identified in Exhibit C-1). Access Easement Closure The temporary access road from the La Plata Canyon paved road (CR-124) will be closed to access and reclaimed at the conclusion of mining activities. Road reclamation activities will include: • the road will be graded to drain runoff from the 10-year 24-hour storm to the out slope; • the road berm/guard rail will be removed; • 75 to 100 foot spaced rolling dip or water bars will be constructed; • Excavated excess material will be used to blend the topography to approximate original contour; • the existing 36 inch CMP will be removed; • excess road fill will be used to contour road disturbed areas or be used as a road barrier. (Exhibit D-2); • disturbed areas will be seeded; and • road closure and no trespassing signs will be posted. Disturbance to designated wetlands will be avoided to the extent possible and unavoidable impacts will be minimized and/or mitigated in accordance with the Army Corps of Engineers criteria (Attachment E-2). As necessary and when deemed prudent by the Division, material including rocks and boulders will be removed from the wetland along the toe of the road fill. Mitigation wetlands will be designed to blend with the existing topography. The access road reclamation area will have a side slope not exceeding 1.5(H):1(V) with the exception of the cut slope which will remain at a slope of approximately 0.7:1. In addition, the road fill including the culvert will be removed. Excavated fill will be used to grade the road to tie contours into the existing to- pography. Damaged silt fencing, wattles, rock barriers, and check dams will be replaced and removed when the slope is deemed to be stable. Disturbed wetlands will be reclaimed in accordance with Army Corp of Engineers reclamation criteria. 6 4 5 2) (b) Post-Mining Use and Vicinity Following mining and reclamation, the site will be returned to recreational land use. This is compatible with land use for the rest of the land within property boundaries and surrounding land use. A significant portion of the surrounding land is the public San Juan National Forest, administered by the U.S. Forest Service, with primary use as recreation, wilderness, range, timber, watershed, and fish and wildlife habi- tat. Adjacent and nearby private properties have land use of- • active mining; • pastureland; and • residential. May Day Idaho Mine Complex 112(d) Permit Application September 21, 2010 (REVISED Oct. 22, 2010) 4