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Foidel Creek Mine C-82-056 2021 Annual Hydrology Report <br /> reduced to bi-annual (every other year) at 001-83-106, 95M001, FBR-2-E, and 97013TC. Well <br /> 001-83-106 (018106) was dry and could not be sampled. Also, per TR03-42, Trout Creek <br /> Sandstone wells 008-75-EFC and 97012TC were deactivated. <br /> The potentiometric surface trends prevalent in the Twentymile Sandstone and Wadge Overburden <br /> aquifers are not evident in the Trout Creek Sandstone. Previously monitored well 006-83-48C, <br /> located in the south-central portion of the permit, routinely exhibited water levels in the 7100 ft <br /> elevation range suggesting the potentiometric surface was mounded in this area. Well 006-83- <br /> 48C was mined through in 1993 and was subsequently replaced by well FCM#2. The water level <br /> measured at well FCM#2 was approximately 6500 ft. Due to concerns related to FCM#2 well <br /> construction, the mine installed well 95M001 into the Trout Creek Sandstone in the fall of 1995. <br /> Water levels measured at well 95M001 confirmed that the levels recorded in well FCM #2 were <br /> accurate (Figure 24). Mining in the northern mining district, which is down dip of this well, began in <br /> 1995. The water level in well 95M001 has continued to decline but appear to be stabilizing (Figure <br /> 24). This decline may be influenced by the underground mining operation however significant <br /> inflows from the Trout Creek Sandstone into the mine workings have not been encountered to <br /> date. <br /> The water levels in the Trout Creek Sandstone have also been impacted by the mines potable <br /> supply well 001-83-106. Drawdowns, partially associated with the use of the supply well, have <br /> also been observed in adjacent well 001-83-107. The mines use of potable well 001-83-106 has <br /> declined over the last couple of years and water levels have started to return in this well. Water <br /> levels at 001-83-107 have been stable since the 2000's. Declines in water level observed in the <br /> late 1980's into the 1990s reflect effects from longwall mining that began in the western mining <br /> district in 1990. <br /> Well FBR-2-E (Figure 28), located along the eastern permit boundary has exhibited a fairly <br /> consistent water level of about 6667 ft elevation between 1999 and 2017. The water level dropped <br /> by about 15 feet to approximately 6650 ft in 2019. This drop was confirmed in 2020. FBR-2-E is <br /> near the current mining area which could be the reason for the decline in the water level although <br /> the specific reason for these drops were not apparent. Many historical boreholes have indicated <br /> faulting exists in this area. The water level measured in Well 97013TC (Figure 26) in 2021 has <br /> 10 <br />