2007-03-16_REPORT - C1981010 (7)

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these two coals have been termed the HI aquifer and have been mined in the A, B, F, G and Z pits, currently the A and G pit mines the H coal seam while the F and Z pits mine the I seam. H pit mined the G seam. The 3rd White Sandstone (G coal and sandstone below) and 2nd White Sandstone (F coal and sandstone below) are monitored at six locations. The Lewis Shale is monitored at one location. The Johnson and Pyeatt Gulch alluvial aquifers are monitored at one site in each of these drainages while the Flume Gulch alluvium is monitored at two locations. The 2005 hydrologic monitoring report, Hydro - Engineering, LLC (2006), presents the discussion of the monitoring results through 2005. The table on the pull -out index provides basic well data for all wells monitored in 2006. Wells 81 -03A, GE -1, GE -2, GE -3, GLUX -1 and GP-6 were not required to be monitored after the first half of 2006. Springs at Trapper Mine were monitored during 2006 in accordance with the approved monitoring plan. Springs with measured flows of greater than 5 gpm were sampled for full suite water quality parameters. Results of the 2006 spring monitoring are presented in Table B -2 in Appendix B. Table 1 -1 (page 1-4) presents the pit and well dewatering data and volume of water used for dust depression for Trapper Mine for 2006. This data shows that, on an average, approximately 17.8 gpm was pumped from the Trapper Mine pits during 2006. Well dewatering was started in September of 2002 in the G pit. The average well pumping rate for 2006 was 29.3 gpm for the G pit well dewatering. This data is useful in interpreting water -level changes and consumptive use. Surface -water flow and quality were monitored at only Flume Gulch (S -1), Johnson, No Name, East Pyeatt, Middle Flume, East Flume and East Middle Flume drainages during 2006. The Johnson, No Name, Coyote, Ute, Middle Pyeatt, East Pyeatt, Deer, West Pyeatt, Far East Bnz7ard, Trapper Mining Company 1 -2 2006 Annual Report