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SUMMARY <br />Except for the elevated conductivity and iron of mine dewatering at site I I5, there have been no significant <br />unexpected hydrology impacts attributable to the activities or developments at the Foidel Creek Mine during the <br />1999 Water Year. The previously noted declining water level trend in Wadge Overburden well 91 M006 appears <br />to have continued during 1999 after stabilizing levels were noted during 1995. This trend may be related to <br />localized dewatering of [he fonna[ion as a result of mining activities in the vicinity. A marked decline in water <br />level, which corresponds with longwall mining in the East Mining District was noted to occur in wells 93M001 <br />and 93M003. No significant water quality degradation is noted for the Wadge Overburden formation as a result <br />of evaluating data collected during 1999. <br />Water levels in the monitored T+ventytnile Sandstone wells remained comparable to previously collected data and <br />stable. No significant +vater quality influences are noted to be evident in feld data obtained during 1999. <br />Localized dewatering of the Trout Creek Sandstone appears evident in [he vicinity of well 001-83-106 although <br />levels remain stable. The declining water level trend to be apparent at well 001-83-107 seems to be leveling off. <br />All of these declines may be attributable to the pumping of well 001-83-106. Well monitoring efforts at 95M001 <br />during 1999 yielded water levels comparable to those previously documented at +vell FCM#2. Water quality <br />characteristics recorded at [his site are also comparable to those previously defined for well FCM#2. The water <br />levels returned by this site and by well FCM#2 during 1999 are noted [o be markedly lower [Iran levels previously <br />• returned from well 006-83-43C. No inflows from the Trout Creek formation into the mine workings have been <br />encountered to explain this difference in potentiometric surface or to suggest that dewatering of the formation is <br />directly attributable to mining activities. No readily apparent water quality impacts associated with mining are <br />noted for rite Trout Creek Sandstone aquifer based upon data collected during 1999. <br />Mining related dewatering impacts are noted for the Fish Creek sandstone +vells 91M001 attd 91M004. Botlt <br />sites were undermined in 1995 and exhibited water level declines corresponding to mining activity. Both wells <br />appear to be stabilizing however 91M004 still experiences seasonal water level fluctuations. Two springs are <br />monitored in the same vicinity. SWI did not flow during This period, but SW2 was recorded as Flowing in <br />November, May, attd August. TCC will continue to monitor these locations in 1999. <br />No unusual observations are noted with respect [o Foidel Creek alluvium groundwater levels. Though remaining <br />elevated. Well 001-5-? condttc[ivi[y values appear to be stabilizing. Elevated TDS concentrations previously <br />documented at Foidel Creek alluvium at well 008-AV-? have declined slightly. TCC will continue to carefully <br />monitor the direction of this trend. <br />No unusual observations are noted with respect to Fislt Creek alluvium groundwater levels. The +vater level <br />decline noted in well 006-AY-1 since 199, appears to be leveling off. 1999 water levels were very similar to the <br />1998 levels. Overall, Fluctuations at this well are insignificant. No other notable water level observations are <br />• apparent based upon review of the 1999 data. The gradual increase in the field conductiviq~ trend continued in <br />14 <br />