Laserfiche WebLink
aquifer. The H and I coal seams and sandstone between these two coals have been termed the HI <br />aquifer and have been mined in the past in the A, B, F, G, K, L and Z pits, currently the L pit mines <br />the H and I coal seams. The D pit previously mined the Q and R seams and the I and I l seams. H <br />pit mined the G seam. The 3rd White Sandstone (G coal and sandstone below) and 2nd White <br />Sandstone (F coal and sandstone below) are monitored at four locations. The Lewis Shale was <br />monitored at one location but well P3 was abandoned in 2016. The Johnson and Pyeatt Gulch <br />alluvial aquifers are monitored at one site in each of these drainages while the Flume Gulch alluvium <br />is monitored at three locations. The 2016 hydrologic monitoring report, Hydro -Engineering, LLC <br />(2017), presents the discussion of the monitoring results through 2016. Table 1-2 provides basic <br />well data for all wells monitored in 2017. Wells 81-03A, GE -1, GE -2, GE -3, GLUX-1 and GP -6 <br />were not required to be monitored after the first half of 2006. Monitoring of wells GLEV-1, GLEV- <br />2 and GLEV-3 which are located on the east side of the Trapper mine were started in 2015. <br />Springs at Trapper Mine were monitored during 2017 in accordance with the approved <br />monitoring plan. Springs with measured flows of greater than 5 gpm were sampled for full suite <br />water quality parameters. Results of the 2017 spring monitoring are presented in Table B-2 in <br />Appendix B. <br />Table 1-1 (page 1-5) presents the pit and well dewatering data and volume of water used <br />for dust suppression for Trapper Mine for 2017. This data shows that water was pumped from the L <br />Trapper Mine pit during 2017. Well dewatering was started in September of 2002 in the G pit. The <br />average well pumping rate for 2017 was 31.6 gpm for the G pit well dewatering. This data is useful <br />in interpreting water -level changes and consumptive use. <br />Surface -water flow and quality were monitored at Flume Gulch (S-1), Johnson, No <br />Name, Ute, Middle Pyeatt, East Pyeatt, Oak, Horse, West Flume, Middle Flume, East Middle <br />Trapper Mining Company 1-2 <br />2017 Annual Report <br />