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the data from phases one and two may be overlain. These maps will <br /> first be used to finalize a reclamation concept, then used to <br /> facilitate a reclamation bid for the four roads. The data <br /> collected at the other locations will be saved and maps will be <br /> used in conjunction with future bids. <br /> In mid-September an inspection of the concrete flume which conveys <br /> Dutch Creek revealed that a number of holes had developed in the <br /> base of the flume. Shortly thereafter, a bid package was <br /> developed, and a site showing held. In early October, a flume <br /> maintenance bid was awarded. The scope of work included removal of <br /> the nine feet diameter steel culvert from the concrete flume, <br /> diversion of Dutch Creek within the flume, and repairing the holes <br /> worn in the base of the flume. This work began on October 14, <br /> 1995, and was completed on October 24. The concrete was allowed to <br /> cure under insulation for an additional ten days. The flow through <br /> the flume is now relatively even rather than being concentrated in <br /> the center of the concrete flume. The flume gradient is also <br /> constant rather than being interrupted by the steel culvert. These <br /> activities should eliminate the problem of rock blocking the flume <br /> during high flows. <br /> One potential problem with the flume still exists. The outlet end <br /> of the flume is supported by a concrete foundation. Upstream of <br /> the end foundation is a gap of about nine feet until the next <br /> foundation is encountered. There is no support under this 9 feet <br /> span. There is a potential that this area of the flume could fail <br /> under the load of Dutch Creek during runoff. An offsetting factor <br /> to the potential for failure is the presumption that the base of <br /> the flume is heavily reinforced by rebar. Observations of concrete <br /> structures throughout the site indicate that great amounts of rebar <br /> were used throughout the project. The concept of a failure was <br /> discussed with Jim Pendleton, who indicated that the potential for <br /> failure was minimal. Dr. Pendleton pointed out that the <br /> environmental risk of additional sediment loading to the Coal Creek <br /> system due to failure of the end of the flume during high flows is <br /> negligible. Regardless, this structure will be monitored before <br /> and during the 1996 runoff for signs of failure. <br /> On the evening of October 12, 1995, a diversion ditch below the <br /> facilities area, and adjacent to Coal Creek, was observed. During <br /> this inspection it was noted that diesel fuel could be strongly <br /> smelled at the Creek. Two seeps which emanated from the facilities <br /> side of Coal Creek were located. The upper seep reports to the <br /> diversion ditch and eventually to pond 001. The lower seep reports <br /> to Coal Creek. A peacock colored oil sheen was observed at these <br /> seeps. <br /> Division staff had previously been requested to complete a water <br /> quality sampling program at various locations above and below the <br /> mine site. The lower seep was also included in the sampling <br /> regimen. <br /> 13 <br />