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MINE CLOSURES <br /> Feature ID: 455 <br /> Type of Feature: Shaft <br /> Excavated Dimension: 30ft by 20ft <br /> Eroded Dimension: 32ft by 25ft <br /> Construction Dimension: 32ft by 25ft <br /> Mine Dump Volume: 2,500cy <br /> Condition: Collapsed <br /> Lining: Rock <br /> Depth of Opening: 200+ft <br /> Depth to Plug: 25ft <br /> Depth to Bedrock: 25'ft <br /> Shape of Opening: Irregular <br /> Surface Material: Waste Rock <br /> Drainage Present: No <br /> Drainage Defined: N/A <br /> Access Deterrent: None <br /> Closure Method: Monolithic Plug Closure, per SWS 7 <br /> Work Description: Install a monolithic plug closure in accordance with Standard Work <br /> Specification 7. This specification has been modified to utilize local materials. Large <br /> concrete piers and rubble located nearby will be used as rockfill. The cost for loading and <br /> transporting the concrete rubble to the work site will be covered under Item 4.0. <br /> The concrete rubble shall be installed in the bottom of the opening to a thickness of <br /> roughly five (5) feet or as directed by the PROJECT MANAGER. Rubble shall be placed <br /> in a manner so that units are interlocked and forms a generally flat top. Concrete <br /> (4,500psi) will then be placed on top of the rockfill to a thickness of roughly four (4) feet. <br /> The concrete shall be thoroughly compacted using a suitable mechanical vibrator to <br /> ensure sufficient distribution within the rockfill. Once the concrete has cured, the <br /> remaining depth will be backfilled to the surface with general fill and mounded to ensure <br /> positive drainage. Fill material is not available on site and must be transported by the <br /> CONTRACTOR. The cost for backfilling should be included in this Bid Item. The cost for <br /> loading and transporting fill material will be covered under Item 5.0. <br /> The safety fence and barriers must be replaced around the opening at the end of each <br /> work day for safety and security. Upon completion, the safety fencing and posts shall be <br /> retained for collection by PROJECT MANAGER unless otherwise directed. <br /> Up to one hundred and fifty (150) cubic yards of rockfill and (80) cubic yards of 4,500psi <br /> concrete is required for this closure. <br /> Rev. 07/07/2023 <br /> Page 13 of 20 <br />