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Table 7a provides the period of record statistical summary of collected data at well 001-83-106. Figures <br />• IS through 19 provide graphical representations of water levels and selected water quality parameters <br />recorded at each site. <br />The potentiometric surface in the Trout Creek Sandstone is difficult to interpret and complicated by periodic <br />pumping of well 001-83-106. The poten6ometric surface trend prevalent in the Twentymile Sandstone and <br />Wadge Overburden aquifers is not evident in the monitored Trout Creek wells. The previously monitored <br />well 006-83-48C routinely exhibited water levels in the 7100 ft elevation range while replacement well FCM <br />N2 returned a level at elevation 6573 ft during 1994. The southernmost Trout Creek well (001-83-107) <br />currently exhibits water levels in the 6915 fr elevation range while the northernmost well (008-75-EFC) is <br />typically azound the 6610 fr elevation level. During 1994, water levels in the Trout Creek were observed <br />to be consistent with recently obtained measurements. Well 001-83-106 remains drawn down due to <br />consistent pumping and 001-83-107 continues to exhibit a decline in water level first evidenced in 1992. <br />Well 006-83~8C exhibited a fairly steady decline prior to being undermined during 1993 and well 008-75- <br />EFC remains stable. <br />Five measured parameters at we11001-83-106 returned values outside of previously established ranges during <br />1994, however, none are believed to evidence significant mine related impacts. Specifically, new maximum <br />field temperature and alkalinity values were recorded in May with a new minimum field pH and new <br />maximum dissolved iron and manganese values recorded in October. TCC will continue to monitor the <br />reduced pH and potentially associated elevated iron and manganese levels at this site. Although not required, <br />full suite analyses on a water quality sample drawn from well 001-83-107 was conducted during 1994. <br />Results are presented in Table 8 and are similar to the well 001-83-106 results with the exception that <br />elevated iron and manganese levels were not detected at this site. The water quality sample obtained from <br />well FCM p2 exhibits characteristics similar to other Trout Creek wells with the exceptions that pH and <br />alkalinity values are elevated. This may be related to the alkaline cement grout material utilized to complete <br />this well. TCC continues to monitor FCM k2 and pH values are noted to be steadily declining with the most <br />recent measurement in April 1995 down to 9.2, within the normal range previously evidenced at other Trout <br />Creek Wells. With the exception of the previously noted pH values, field parameter measurements on <br />monitored Trout Creek Sandstone wells during 1994 returned values within anticipated ranges with no mine <br />related impacts evident. <br />ALLUVIAL GROUNDWATER MONITORING <br />Alluvial deposits containing groundwater are monitored in the Foidel Creek, Fish Creek, and Trout Creek <br />drainages. In the Foidel Creek drainage, sites both upstream and downstream of the TCC portals and <br />support facilifies are monitored. In the Fish Creek Drainage, sites upstream and downstream of the Mine <br />2 area and the Fish Creek Borehole mine dewatering facilities are monitored. During 1994 on Trout Creek, <br />an additional monitoring site was established downstream of the confluence with Fish Creek. <br />-4- <br />