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Feature ID: 768 <br /> Type of Feature: Shaft <br /> Excavated Dimension: 1 Oft by 8ft <br /> Eroded Dimension: 28ft by 18ft <br /> Construction Dimension: 1 Oft by 8ft <br /> Mine Dump Volume: 25,000cy <br /> Condition: Intact <br /> Lining: Rock <br /> Depth of Opening: 200+ft <br /> Depth to Plug: N/A <br /> Depth to Bedrock: 15ft <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: Polyurethane Foam, per SWS 9 <br /> Work Description: Install a polyurethane foam (PUF) closure in accordance with SWS 9. Set <br /> bottom form at twenty four (24) feet below ground surface. Install twenty (20) feet of PUF and <br /> backfill the remaining four (4) feet with onsite dump material. Backfill shall be graded to blend <br /> with the surrounding slope, ensuring positive drainage to the south and away from the closure. <br /> In order to ensure maximum expansion and limit heat generation, PUF shall be installed in lifts <br /> with a maximum rise of two (2) feet. PUF shall pass through the tack free stage before the next <br /> lift is applied. At no time shall PUF be poured or allowed to cut into rising foam. Installed PUF <br /> shall be monitored with an IR thermometer to ensure the temperatures do not exceed 200°C. If <br /> unsafe temperatures are observed, PUF installation activities will cease until the PUF has <br /> cooled thoroughly. No more than thirty (30) cubic yards of PUF shall be installed in a single <br /> day. <br /> A swale measuring roughly two (2) feet wide and one (1) foot deep will also be constructed <br /> along the toe of the slope to the north to keep surface water away from the finished closure. <br /> Up to one hundred (100) feet of swale will be constructed. Some hand work may be required to <br /> complete this task. PROJECT MANAGER will flag location of swale in the field. Disturbance to <br /> the hoist foundations, brick piles or other historic features is prohibited. <br /> The safety fencing and posts installed around the shaft shall be retained for collection by <br /> PROJECT MANAGER. <br /> Sixty (60) cubic yards of PUF is required for this closure. <br /> Rev. 07/07/2023 <br /> Page 14 of 20 <br />