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• parameters are recorded for measurable inflows from the accessible areas of the mine. Results of the 1998 <br />survey aze presented on Figure 120. The majority of the mine has been sealed resulting in fewer measuring <br />point<_. than prior years. The water level data for the period of October 16, 1997 to May 18, 1998 from the Fish <br />Creek Borehole was used to estimate the flow into the west mine district. Based upon the same factors used in <br />the prior AHR [he flow estimate for [he west mine district is approximately 52 gallons per minute. <br />In summary, [he inflows encountered in the mine are similar to [hose reported in prior AHR's. The inflows are <br />within the projected flows presented in the permit. Water quality has no[ changed significantly and appears [o <br />mirror the quality of the adjacent spoil water. <br />SUMMARY <br />No significant unexpected hydrology impacts attributable to the activities or developments at the Foidel Creek <br />Mine one observed to have occurred during the 1998 Water Year. The previously noted declining water level <br />trend in Wadge Overburden well 91M006 appears to have continued during 1998 after stabilizing levels were <br />• noted during 1995. This trend may be related to localized dewatering of the formation as a result of mining <br />activities in the vicinity. A marked decline in water level, which corresponds with longwall mining in the East <br />Mining District was noted to occur in wells 93M001 and 93M003. No significant water quality degradation is <br />noted for the Wadge Overburden formation as a result of evaluating data collected during 1998. <br />Water levels in the monitored Twentymile Sandstone wells remained comparable to previously collected data and <br />stable. No significant water quality influences are noted to be evident in field data obtained during 1998. <br />Locali red 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 Vend continues to be apparent at well 001-83-107. All of these <br />declines may be attributable to the pumping of well 001-83-106. Well monitoring efforts at 95M001 during 1998 <br />yielded water levels comparable to those previously documented at well FCM#2. Water quality characteristics <br />recordr~d at this site are also comparable to those previously defined for well FCM#2. The water levels returned <br />by this site and by well FCM#2 during 1998 are noted to be markedly lower than levels previously returned from <br />well 0(16-83-48C. No inflows from [he Trout Creek formation into the mine workings have been encountered [o <br />explain this difference in potentiometric surface or to suggest that dewatering of the formation is directly <br />attributable to mining activities. No readily apparent water quality impacts associated with mining aze noted for <br />the Trout Creek Sandstone aquifer based upon data collected during 1998. <br />• <br />-13- <br />