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<br /> <br /> <br />sandstone forms massive white cliffs and regionally averages 100 feet in <br />thickness (Bass et al, 1955). The sandstone was structurally deformed in • i <br />the region by rising domes and tectonic uplifting. In the area of the <br />Seneca IIW and Yoast properties, the sandstone dips 11-15° and is exposed <br />along the eroded axes of the Trout Creek and Fish Creek anticlines which <br />plunge to the north. Along the western limb of the Trout Creek anticline, <br />the sandstone was found to be approximately 200 feet thick. Although the <br />Trout Creek sandstone is a source of good quality ground water, it is not <br />an aquifer commonly used in the region because of its great drilling <br />depths and because shallower, productive, good quality water aquifers <br />exist above the Trout Creek. <br />Assumptions <br />It is assumed in the model that within the Trout Creek sandstone • <br />outcrop, ground water is unconfined and in direct hydraulic communication <br />with perennial streams that cross it. In actuality, the sandstone is not <br />likely to be saturated and in direct hydraulic communication .with the <br />surface flow, but this assumption allowed the model to overestimate the <br />stream loss due to pumpage and simulate a worst case or most conservative <br />approach. <br />Leakance from the overlying stratigraphic units was not simulated in <br />the model. Leakance probably occurs over the entire area. Ignoring this <br />Leakance in the model causes total recharge to the Trout Creek sandstone <br />to be underestimated, and consequently, the stream loss to be <br />overestimated. <br />8333003.004 2 • <br />GeoTrans, inc. <br />