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comparing water chemistries in channels that no longer <br />receive CBM discharge, their waters have higher salt <br />concentrations and SARs. Changes in soil chemis- <br />try confirm this salt migration (Neuhart, 2003). Study <br />results show that the interaction of CBM water and <br />groundwaters are changing the chemical composition <br />of the CBM discharge water and these water and soil <br />interactions should be considered in the planning and <br />management of CBM activities. The ability to comply <br />with state water quality standards requires an under- <br />standing of the surface <br />and groundwater inter- <br />actions. <br />This research was <br />funded by the U.S. <br />Environmental Pro- <br />tection Agency under <br />the Clean Water Act <br />104(b)(3) water quality <br />grant program. <br />References <br />DeBruin, R.H., R.M. Lyman, R.W. Jones, and L.W. Cook. 2000. <br />Coalbed methane in Wyoming. Information Pamphlet #7. Wyoming <br />State Geological Survey; Laramie, Wyoming. <br />McBeth, Ian H., Katta J. Reddy, and Quentin D. Skinner. 2003. <br />Coalbed methane product water chemistry in three Wyoming water- <br />sheds. J. of the Amer. Water Res. Assoc. June, 2003, pp.1 -11. <br />Neuhart, A. 2003. Interaction of coalbed methane waters with soils <br />in the Powder River Basin. M.S. Thesis, Watershed Science, Colo- <br />rado State University.102pp. <br />Patz, M.J., K.J. Reddy, and Q.D. Skinner. 2004. <br />Chemistry of Coalbed Methane Discharge Water <br />Interacting with Semi -Arid Ephemeral Stream <br />Channels. J. American Water Resources Associa- <br />tion. October 2004. pp. 1247-1255. <br />Rice, C. A., M. S. Ellis, and J. H. Bullock Jr. 2000. <br />Water Co- produced with Coalbed Methane in <br />the Powder River Basin, Wyoming: Preliminary <br />Compositional Data. Open -file Report 00 -372. U. <br />S. Department of the Interior. U. S. Geological <br />Survey. Denver, Colorado. <br />PH <br />7.4 <br />8.8 <br />7.7 <br />7.7 <br />Electrical conductivity (dS /m) <br />1.8 <br />2.1 <br />5.9 <br />18.4 <br />Ca (mg/L) <br />12 <br />6 <br />230 <br />250 <br />Mg (mg/L) <br />13 <br />45 <br />142 <br />278 <br />Na (mg/L ) <br />370 <br />375 <br />791 <br />3200' <br />Sodium adsorption ratio <br />17.4 <br />11.4 <br />10.1 <br />33.1 <br />Cl (mg/L) <br />21 <br />21 <br />77 <br />91 <br />HCO3 and CO3 (mg/L) <br />900 <br />900 <br />744 <br />760 <br />SO4 (mg/L) <br />48 <br />144 <br />2700 <br />" 4400 <br />Table 1. Mean concentrations for surface and groundwaters collected from Beaver Creek, Powder <br />River Basin, Wyoming. <br />i <br />