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• Monitoring of wells 2-7TWU, 2-7TWL, 2-7U, 2-7M, 2-7L, 35-4U, 35~L, 35.4M, 36-2U, 36-2L and RM-1 was <br />discontinued pursuant to DMG's approval of TR48. Monitoring was discontinued because these holes were <br />either dry or did not serve any purpose. Well 35-4M is venting gas and could not be monitored for safety <br />reasons. These wells will not be plugged without DMG's prior approval. They will be retained to allow for <br />monitoring associated with bond release. <br />Alluvial monitor hole Qal-5 is periodically monitored to measure impacts to the White River's alluvial aquifer <br />from the mine's production water well field. With the flooding of the Kenney Reservoir the mine abandoned <br />pumping from the well field and began pumping directly from the river. <br />Nine (9) new alluvial monitoring holes were installed in Red Wash (see Map 137) during the spring or <br />summer of 1986. These holes were installed to monitor water levels during the mining of Longwall Panel <br />No. 1. After installation of these holes, water levels were measured once every two months. When the <br />longwall face has advanced to within 200 feet of the Red Wash alluvium, water level monitoring began on a <br />schedule of once every lwo weeks and continued on this schedule until the longwall face had advanced <br />past the alluvium 400 feet. Thereafter, monitoring resumed at a schedule of once every two months until <br />longwall mining in panel 1 was complete. Results of the Red Wash monitoring have been reported in the <br />Deserado Mine Annual Hydrology Report, and in an Interim Report submitted to CMLRD in November <br />1987. <br />• The purpose of the Red Wash alluvial monitoring program was to determine whether surface flow in Red <br />Wash would be lost to bedrock as a result of subsidence. The major conclusions of the program were: <br />• Surface flow in Red Wash is not lost to bedrock as a result of subsidence. <br />• Recharge of the basal alluvium is from the upper sandstone facies (bedrock) and not from infiltration of <br />surface runoff. <br />• Subsidence cracks in Red Wash are quickly filled with clay and silt preventing any loss of surface water <br />to bedrock. <br />• Water ponding in the subsided area acted as a stilling basin for deposition of clays and silts being <br />carried down Red Wash. This provided a beneficial impact in that the sediment load to the White River <br />was reduced. <br />Since these wells RW-1 through RW-9 satisfied their intended study purposes, monitoring requirement of <br />these wells was eliminated in 1997 by DMG in response to a technical revision. It is expected that future <br />subsidence from longwall mining under Red Wash and Scullion Gulch will have similar effects as those <br />. observed during this monitoring program. <br />Permit Renewal #3 (Rev. 8/99) II.C-77 <br />