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Water Levels 



Two piezometric pressure maps, dated June and December, 1987, were 

 prepared by Prairie Coal Ltd. Figure 11 was compiled from the 

 December map and shows the cone of depression formed by the 

 pressure contours in the Hart Coal Seam. The southern extent of 

 the cone of depression at the end of 1987 is unchanged from its 

 position in the previous year. The position of the one metre 

 contour therefore remains at 1.8 kilometres north of the 

 International Boundary. 



Montana 



Locations of the Montana monitoring wells are shown in the 

 Technical Monitoring Schedule. During 1987 quarterly water levels 

 were obtained from 21 wells located in Montana. Hydrographs for 

 wells 5, 7, and 9, which are completed in alluvium. Hart Coal, and 

 Fort Union ( Ravens c rag ) , respectively, are presented in Figure 12. 

 The water levels fluctuate within one foot of their average. The 

 minor fluctuations are mainly attributed to regional climatic 

 conditions rather than to any impact resulting from the mining of 

 coal for the Poplar Power Plant. Although some minor fluctuation 

 has occurred, a trend in water levels has not been established. 



