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ITEM 4 BACKFILL PORTAL <br /> Backfill the Lower Level Portal <br /> Type of Feature: Adit <br /> Excavated Dimension: 3ft by 75ft <br /> Eroded Dimension: 3ft by 5ft <br /> Present Size Opening: 3ft by 5ft <br /> Mine Dump Volume: 100.00 CY+ <br /> Condition: Collapsed at 20ft inby <br /> Lining: Timber <br /> Depth of Opening: 20 ft <br /> Depth to Plug: 20 ft <br /> Depth to Bedrock: 40 ft <br /> Shape of Opening: rectangular <br /> Surface Material: colluvium <br /> Drainage Present: Yes, 1 —5 gpm <br /> Drainage Defined: precipitate formation in channel <br /> Access Deterrent: none <br /> Bat Closure: None required <br /> Closure Method: Backfill with drain pipe <br /> Work Access: Access available for all types of equipment <br /> Work Description: Backfill per Standard Work Specification 2Six inch(6")diameter 30 foot <br /> (30')long perforated drain pipe set in twelve inches of coarse fill <br /> consisting of 2 inch or greater material,found on-site,required to be <br /> bedded on the floor of the mine. Machine backfill by removing the <br /> timbered structure and filling around the pipe to match surrounding <br /> natural topography. <br /> Measurement and Payment <br /> There will be no measurement for payment. Payment for this task will be reflected in a <br /> lump sum bid under Bid Item 4 on the Bid Schedule, and will be made upon completion <br /> of the mine closure, and as completed and approved by the PROJECT MANAGER. The <br /> price bid shall include all materials, labor, equipment, and all other items necessary and <br /> incidental to complete the tasks described in the bid item. <br /> Page 13 of 17 <br />