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Both Level Seven portals were partially collapsed prior to backfilling in 2009. The Level Seven New Portal required <br /> additional fill to remove the unstable fifteen feet of continually collapsing timbered area that remained in front of the complete <br /> portal collapse from fifteen feet on. The Level Seven Old Portal also required additional closure in front of the complete <br /> portal collapse from thirty feet on. An observation pipe and drainage pipe were placed in the Level Seven Old Portal, but <br /> during filling around the pipes, the timbers in the portal collapsed and loose colluvial material completely covered the <br /> observation and drainage pipes. The drainage pipe continues to drain at roughly 200 gallons per minute, at the same flow <br /> rate as before the collapse. The observation pipe was meant to provide stable access to view the collapse at thirty feet, <br /> allowing the landowner and the DRMS to monitor this unstable draining adit, which is arguably one of the worst high <br /> quantity, poor water quality draining mines in the State of Colorado. Because of the collapse, DRMS decided to install a well <br /> point, driven into the collapse, through the drainage pipe, in an attempt to alleviate concerns about a possible unstable <br /> increase in mine pool head within the Gold King workings. The installed 6 inch perforated steel pipe penetrated <br /> approximately 12 feet of collapsed material thought to exist between the original collapse and the end of the drain pipe. The <br /> well point was unable to penetrate through any of the original existing collapse in the tunnel. <br /> A flume was installed at the Level Seven Old Portal as part of the bond revocation reclamation. The two inch Parshall <br /> Flume was installed in a concrete lined ditch immediately in front of the HDPE lined ditch. The flume will be used to monitor <br /> flow by the landowner and the Animas River Stakeholders Group(ARSG). <br /> There was one Changer Order, issued on 9/17/2009 to increase the project cost by$14,980.00. There were two increases <br /> in cost to the project budget. The concrete lined ditch needed additional concrete work to make the ditch larger in order to <br /> carry the larger than estimated quantity of mine drainage for an increased cost of$12,480.00. The well point installed in the <br /> Level Seven Old Portal was also an additional cost of$2,500.00. The entire bond amount was expended on this project and <br /> the additional funding ($2,082.74)came from the State Appropriated Bond Forfeiture Severance Tax. <br /> Remaining Reclamation Requirements and Estimated Cost <br /> The mine drainage at the Gold King Level 7 Mine contains extremely high levels of metals and continues to flow between <br /> 150 and 300 gallons per minute. The mine drainage began after bulkheads were installed in the American Tunnel in 1995, <br /> which previously deep-drained the mining district. The mine drainage and the collapse at the Level 7 Old Portal continues to <br /> be of concern to the landowner, DRMS, and ARSG. A future project at the site may attempt to cooperatively open the Level <br /> 7 Old Portal in an effort to alleviate the potential for unstable increase in mine pool head within the Gold King workings. <br /> 1) uv4 ` P1-- 3; <br /> Proiect Manager Senior Proiect Manager <br /> /I S '2_01 /— ( 0 <br /> Date Date <br /> 21 4) <br /> Grants Officer a)AMLIS(Deb)/b)BrassCap(Yvonne;then to Kristin for filing) <br /> Date Date <br /> Ac of 05/I4/00 <br />