2006-01-23_REVISION - M1978208 - Laserfiche WebLink

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._ Shaffers Crossing Ouany Petition to Amend ODP: Extend Allowable timeframe to complete Mining b) Reclamation Plan Review This applicant proposes an amendment to the existing ODP in part to address inconsistencies in the original reclamation plan filed in 1979. The existing documents outlining the mining procedure and development of all extractable resources on the site are vague and inconsistent, for example, at least three separately identifiable bench confrgurations are listed as possibilities in the existing plan. We propose providing a corrected and accurate plan to which we will adhere during mining, Such a plan will idemtfy the phases of reclamation (reclamation schedule), actual extractable blocks during mineral extraction of commercial aggregate as defined in the ODP, proposed bench configuration, locations of stockpiled material including reclaim and topsoil shown in the attached Grading & Erosion Control Plan, drainage diversion features, both temporary and permanent also shown in the attached Grading & Erosion Control Plan. This plan identifies the anticipated duration of all phases of mineral extraction of commercial aggregate as from between ten (10) to fifteen (15) years to complete. xicting Site Conditions At the time of due diligence and discovery and between July 2002 following mobilization to the site, site investigations and a survey of the SSW comer of the property revealed that no clear bench configuration exists at all. In short, there is no evidence that arty of the proposed bench designs have been adhered to during the development to date of the site. Furthermore, the highwall exhibits dangerous and unsafe conditions, with numerous hang-up rocks, an MSHA violation. The outcropping material had been stripped to bedrock inconsistently indicating a 'highgrading' of material. Blasting on 12/09/02 revealed old half-casts along the 7990 bench elevation and adjacent to the existing highwali. These are approximately an 1-7/8" diameter half cast. A clearly visible kerf had been stripped in an unplanned manner during August 2000 by another operator at the site, rewverfng mainly decomposed surface material as a spoil source for local road development from the 8030 to 8D10 elevations. There was no indication of any reclamation on the NW exposed benches. As many as three identifiable bench configurations are curently listed in the original reclamation plan. These are 20 by 10 20by8 45 by 15 We propose the following changes to the bench configuration. We.propose the implementation of a standard 36 by 12 bench design for final highwall configuration The final pit limits v~ill cell for a 20 foot setback from property boundaries. This is fo allow for traffic arountl the pit limits and for egress during reclamation. At least 35% of the area will be preserved as open space as defined under the Conifer/285 Corridor Area Community Plan DESIGN GUIDELINES. Factors affecting the proposed bench design include the following: • Poisons Ratio and Risk Analysis of Potential Slope Failure (determined to be Low) as a direct result of steepening the slope JC 00640 PetersonlElk Creek