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deacribed above for sur~faee water monitoring. <br />Should there be a significant difference in eater <br />quality between the existing P6M well and the nee well to <br />be installed upstream of our surface facilities, a second <br />new yell might be installed in the NW/4 of the SE/4 of Sec <br />22 TLN, RB6W. Installation and monitoring procedures would <br />be as deacribed above for the first nee well. <br />Bedrock Groundwater <br />The primary concern relative to potential effects of <br />mining on the existing ground-eater regime ie centered upon <br />the question of whether eater bearing materials will be <br />disrupted by the mining activities. and if so, hoe will the <br />disturbance affect floe in the strata and interchange of <br />gzouad vater.vith Trout Creek and its associated alluvium. <br />In the absence of site specific ground-eater data at the <br />Apez Nine. the following comments are based upon <br />extrapolation of regional information and Water, Waste b <br />Land, Ltd.~s experience in the area: <br />°An ongoing comprehensive study of the geohydrology in <br />-the general area to the north and vest of Trout Crest has <br />involved the drilling and completion of a number of yells. <br />By and large. these yells have been completed in strata <br />that eaist from dust below the Wadge coal seam to the <br />ground surface. One yell for which ve have data has been <br />completed in the Trout Creek sandstone that ezists below <br />the Wadge and above the Pinnacle coal seams that will be <br />mined by Sunland' Mining Corporation at the Apez Mine. Some <br />of the general conclusions reached in this study that are <br />pertinent to the present concezn are as follows. <br />Probably the two main eater bearing strata in the <br />region (ezclusive of alluvial aquifers) are the Twentymile <br />Sandstone above the Wadge and the Trout Creek Sandstone <br />below the.~Wadge. Strata between these two major features <br />constitute sn interbedded sequence of sandstones, shales, <br />.siltstonee, and coals. A major feature o.f this portion of <br />the etratrigraphic profile is a marine shale member some <br />S00 ft thick. The sandstones are generally not correlatable <br />over Substantial. .distances, indicating poor lateral <br />continuity over the region. Nevertheless, yells completed <br />in Such sandstones both below snd above the Wadge coal shoe <br />that they contin ground water. Of particular interest is <br />the observation that wells completed and isolated in strata <br />below the thick .marine shale and in the Twentymile <br />Sandstone above exhibit the same piezometric surface <br />elevation to' within a fee feet. Furthermore, the <br />piezometric heads in Strata above and below the Wadge and <br />in the Wadge itself ,are all .about the same and equal to <br />that in the Twentymile Sandstone. The one yell completed <br />and isolated in the Trout Creek Sandstone also ezhibite a <br />(vQ~ 288) ~0 3 <br />