Laserfiche WebLink
Wells GA -1 and GA -2 were selected as monitoring wells at the GA site to monitor the Q and R seams, <br />• and SS above Q aquifers. These wells were removed by the advancement of Derringer Pit in 1995. <br />Wells GA -3 and GA -4 were not included in the monitoring program because they are completed in the Q <br />and R aquifer also. Wells GB -2 and GB -5 were used to monitor the SS above H seam, and H and I seam <br />aquifers until they were abandoned in 2005. Before being abandoned in 2005, well GB -1 monitored water <br />level only because well GF -3, which was also abandoned in 2005, monitored close to the same strata. <br />Well GD -1 was dropped as a sample well with the construction of GD -1(2) (see MR -115). The GD -1(2) <br />well currently supplies Trapper's domestic water needs with GDA the approved domestic backup well. <br />The three GE wells, abandoned during 2006, were located down gradient of the Derringer, Colt and old <br />Empire Energy pits. Wells GE -1, GE -2 and GE -3 were completed in aquifers of the Q and R, H and I, and <br />F coal seams and below SS, respectively. The GF -1, GF -2 and GF -3 wells were perforated in the <br />Twenty -Mile Sandstone, U Complex and K -L -M Complex aquifers. All three of these wells were <br />abandoned during 2005. Wells GBB -1, GBB -2 and GBB -3 were used as monitoring wells until July 1, <br />1987. These wells were then abandoned and an Empire Energy well (Empire Well 81 -03a) was then used <br />until its use was discontinued in 2006. <br />Ashmore Pit shortens and lengthens with various cuts as it progresses east. Any ground water recharged <br />to the spoils can be expected to accumulate in the northern end of the cut that extends the farthest north. <br />In order to monitor groundwater for utility waste effects, a series of wells have been installed or proposed. <br />• Well GF -5 was established (1984) in regraded spoils at the north end of Ashmore Pit in No -Name <br />Drainage. Well GF -7 was installed in regraded spoil at the north end of Ashmore Pit in 1987. <br />Wells GF -5 and GF -7 are designed to monitor the extent and quality of the re- established water table in <br />backfilled spoils (Map M -52). These wells will determine the occurrence of a leachate from the utility <br />waste in the unlikely event leaching occurs.Well GF -4 was constructed in August, 1982. This well <br />monitors the I -Seam aquifer north of Ashmore Pit, hydrologically down - gradient in Johnson Gulch <br />Drainage. Well GF -6 was installed in August, 1982. It monitors the undisturbed Q seam aquifer just <br />below the north end of Enfield Pit. The Q seam was the lowermost seam to be mined in Enfield Pit. This <br />well will detect changes in groundwater quality from Enfield Pit spoils. Well GF -11 was installed in the <br />north end of the backfilled Enfield Pit following mining, regrading and retopsoiling. Other wells may need <br />to be added to both the Derringer and Enfield Pit areas if utility waste is disposed. In this event, Division <br />approval will be requested for new well(s) locations. <br />4 -246 <br />• <br />