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Colorado Division roject of Reclamation, <br /> Mining & Safety <br /> National 410 Project 2009, continued... <br /> A twenty-seven (27) foot length, six (6) inch diameter <br /> PVC drain pipe with a grated top was installed to pass 1 '� <br /> through the closure from top to bottom. The initial 0.4 <br /> twelve (12) feet above the form was filled with PUF. <br /> Onsite fill was used for the final thirteen (13) feet above . is ,, ' <br /> the PUF to reach the surface elevation. , f r j 7".1,4:'' <br /> �►' <br /> A seventeen (17) foot length, six (6) inch diameter PVCi <br /> � •i '' <br /> drain pipe with a grated top was installed to pass through <br /> the closure from top to bottom. The initial eight (8) feet ► ' -, , ,., I <br /> above the form was filled with PUF. Onsite fill was used \ a" '' ' 4.' ' .'~ +` • <br /> for the final four (4) feet above the PUF to reach the - sr <br /> surface elevation. , <br /> The project was ready for final inspection on September <br /> 3,2009. The Brasscap was stamped at that time. Shaft at the National 410 in the process of being PUF'd. <br /> Change Orders _ , <br /> There were no change orders. The final construction = -- ,# <br /> cost was $8,990.00 •' ` g <br /> F ` <br /> k3 r <br /> if ' <br /> Future Monitoring And Maintenance <br /> The mine closure should be checked annually to assess .4 <br /> the effects of erosion and to ensure their integrity. At that <br /> time the ventilation/drain pipe should also be inspected <br /> to ensure that the vent/drain pipe is clear/open, and , <br /> continues to have a proper grated cover installed. 1 <br /> rf. <br /> 0 i - . <br /> �'-' National 410 shaft PUF&vent pipe view. <br /> = Project Data <br /> • National 410 Project: <br /> " ` 2 shaft closures,Completed 23-July-2009 <br /> _- Construction Cost: <br /> $8,990.00 <br /> Completed project view of shafts PUF'd and backfilled. <br />