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bicarbonate, dissolved lead, dissolved iron, and dissolved manganese. At well FBR-2 (Table I1), a new <br />minimum value was recorded for dissolved solids; new maximum values were recorded for conductivity, pH, and <br />dissolved magnesium. <br />Trout Creek Sandstone: During 1997, fow Trout Creek Sandstone wells (001-83-106, OO1-83-107, FCM#2, <br />and FBR-2-E) required monitoring for water levels and field parameters on asemi-annual basis. An additional <br />well (008-75-EFC) required an annual water level measwement. Wells 001-83-106, FCM#2, and FBR-2-E <br />also required water quality sampling on a semi-annual basis. Well FCM#2 was replaced in the fall of 1995 by <br />monitoring well 95M001. Semi-annual monitoring during 1997 occurred at well 95M001 in lieu of FCM#2. <br />Field parameters at well 001-83-107 were not obtained during 1997 as this well had formerly been pressurized <br />and was constructed to remain sealed. hresswes during 1997 were reduced to the point that artesian flow from <br />the well ceased. Though water level measwements were obtained, no opening large enough for a bailer was <br />available to extract water for field pazameter measwements. In December, 1997, the well was modified to <br />provide access for a bailer and field pazameter measwements were obtained. An elevated pH was noted at this <br />time (9.76) with conductivity and temperatwe readings normal. This data is provided on Table 13 and will be <br />included in next year's AHR as well. Tables 12 through 16 provide summaries of the 1997 Water Year data <br />collected at each site. Table 12a provides the period of record statistical summary of collected data at well 001- <br />83-106 with Tables 15a and 16a providing the period of record statistical summaries of collected data at wells <br />95M001 and FBR-2-E. Figwes 25 through 31 provide graphical representations of water levels and selected <br />• water quality parameters recorded at each site. <br />The continuous pumping of well 001-83-106 (Figwe 25) complicates the potentiometric surface in the Trout <br />Creek Sandstone. The potentiometric surface trends prevalent in the Twentymile Sandstone and Wadge <br />Overbwden aquifers aze not evident in the monitored Trout Creek wells. The previously monitored well 006-83- <br />48C routinely exhibited water levels in the 7100 ft elevation range while replacement well FCM#2 retwned <br />levels around elevation 6520 during 1995. In the fall of 1995, well 95MOOl was established in part to address <br />the apparent discrepancy in water levels between wells 006-83-48C and FCM#2. Water levels retwned from <br />we1195M001 confirm that levels recorded from well FCM#2 were acewate (Figure 27). Inflows from the Trout <br />Creek Sandstone into the mine workings have not been encountered to date to account for the apparent lowering <br />of the potentiometric surface in the Trout Creek formation as indecated by the water level data previously <br />recorded for well 006-83-48C. Some dewatering of the aquifer does ocew from the pumping of well 001-83- <br />, <br />I06 to supply the mine with domestic water. Dwing 1997, the southernmost Trout Creek well (001-83-107 - <br />Figwe 26) exhibited lower water levels in the 6875 fl elevation range while the northernmost well (008-75-EFC <br />- Figwe 28) remained around the 6620 ft elevation level. Well FBR-2-E (Figure 30) retwned levels around <br />6730 fl elevation during 1997. With the exception of well 001-83-107, water levels in the Trout Creek were <br />observed to be consistent with recently obtained measwements. Well 001-83-107 continued to show lower <br />water levels than those typical prior to 1992. As previously noted, the water level in this well declined during <br />L J <br />-4- <br />