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~~~~ <br />~~ <br />including the 'IFaenty 21i1e Sandstone. If ground water in the shal- <br />low strata is contaminated by mine ash and sludge disposal, some <br />of the contaminants could enter the Twenty Mile Sandstone. <br />In the area immediately north of the Trapper Mine ([dell <br />Site GF), ground-water levels decrease with increasing depth, <br />down to some depth between coal seam "R" and the top of the Twenty <br />Mile Sandstone. Ground-water movement in this region has a do~~rn- <br />ward, down-section component. Below that unknown depth, ground- <br />coater levels increase with increasing depth, down to the Twenty <br />Mile Sandstone. Ground-water movement in this region has an up- <br />ward, up-section component. These down-section and up-section <br />flow components converge at some depth between coal seam "R" and <br />the top of the Tcoenty Iwtile Sandstone. <br />In the Big Bottom area (?dell Site GBB) near the Yampa <br />• River, ground-water levels decrease with increasing depth down <br />to some depth between 68 and 140 feet. Ground-water movement in <br />' this region has a downward, down-section component. Ground-water <br />moves from the Yampa River alluvium into the Upper Williams Fork <br />Formation. Under these conditions, ground water and any contami- <br />~ nants from the Trapper Mine area cannot move into the alluvium <br />i or the Yampa River. Below that unknown depth, ground water levels <br />increase with increasing depth, do~,m to the sandstone at 140 feet. <br />Ground-water movement in this region has an upward, up-section <br />component. These down-section and up-section flow components <br />~ converge at some depth between 68 and I40 feet. <br />• <br />1-2 <br />