2012-04-10_REVISION - M1981185 (43)

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(approximately 72 tons per vehicle) for vehicles with solid rubber or cushioned wheels. The 40 -ton vehicle load used by Wildcat for their analysis is below the County's maximum weight limit standards. • A blasting plan, if required by the revised design. The Rule 6.5 Geotechnical Stability Report did not indicate that blasting would be necessary to grade the New Access Road, so no blasting plan has been prepared for the construction of the New Access Road. • Out slope fill material removal and retaining structure construction method, including cross - sections and conceptual drawings for the methods. A section for the retaining structure showing typical footing, backfill material and tie backs and how they relate to the proposed road improvements can be found on sheet C4.91. Exact dimensions of the wall footing, depths of select fill behind the wall and lengths of tie backs will be provided by a structural engineer prior to the start of construction. • Stability of previously placed fill material and native material at the previously constructed out slope. Stability of previously placed fill material is discussed in Section 3.4 — Stability Analysis of the Rule 6.5 Geotechnical Stability Report. • Determine if previously placed fill material and native material is stable for purposes of fill placement. A discussion of the previously placed fill material can be found in Section 3.4 — Stability Analysis of the Rule 6.5 Geotechnical Stability Report. • Determine if excavation will continue until bedrock is exposed to provide subgrade for fill placement. The Rule 6.5 Geotechnical Stability Report recommends to excavate previously placed fill material or 30- inches of overexcavation in Section 5.2 — Roadway Grading. • A method for the removal of the existing timber cribbing retaining wall. The existing timber cribbing retaining wall is called out in the Construction Drawings to be removed. The exact means and methods of this removal is the Contractor's responsibility. There is a general note on the Plan and Profile sheets stating that the Contractor is to remain within the Affected Mine Area Boundary and outside of the wetlands during all construction activities. • Construction of the new retaining wall (Gabion) structures. The Rule 6.5 Geotechnical Stability Report calls for a single mechanically stabilized earth (MSE) wall in Section 5.3 — Retaining Walls. Sheet C4.91 shows details of this retaining wall as well as a typical section of the retaining wall detailing standard construction of an MSE wall. Exact details for the wall will need to be completed by a structural engineer prior to the start of construction. • A method and standards for the placement and compaction of the new out slope fill. The method and standard for the placement and compaction is discussed in Section 5.2 — Roadway Grading of the Rule 6.5 Geotechnical Stability Report. • Modifications to the proposed maximum lift thickness including clarification if the proposed thicknesses are standards for loose or compacted lifts. Page 2