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Lam.: ~. ~.~ilbcf u~:.1 <br />coaro.imww <br />including the T:aenty :file 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 T<•;enty i~file Sandstone. <br />In the area immediately north of the Trapper ;Sine ([dell <br />Site GF), ground-caater levels decrease caith increasing depth, <br />down to some depth betcaeen coal seam "R" and the top of the Tcaenty <br />Mile Sandstone. Ground-caater movement in this region has a down- <br />ward, down-section component. Below that unknown depth, ground- <br />water levels increase caith increasing depth, docan to the Twenty <br />Nile Sandstone. Ground-water movement in this region has an up- <br />ward, up-section component. These docan-section and up-section <br />flow components converge at some depth between coal seam "R" and <br />the top of the Twenty PIi1e Sandstone. <br />In the Big Bottom area (idell Site GBB) near the Yampa <br />.` River, ground-caater levels decrease with increasing depth down <br />to some depth b~tcaeen 68 acid 14v feet. Ground-water movement in <br />this region has a dow~caard, docan-section component. Ground-water <br />moves from tt:e pampa River alluvium into the Upper idilliams Fork <br />Formation. Under these conditions, ground caater and any contami- <br />nants from the Trapper Mine area cannot move into the alluvium <br />or the Yampa River. Below that unknocan depth, ground water bevels-- <br />increase caith increasing depth, down to the sandstone at 140 feet. <br />Ground-water movement in this region has an upward, up-section <br />component. These docan-section and up-section flow components <br />converge at some depth between 68 and 140 feet. <br /> <br />•~ <br />1-2 <br />