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Mayo and Assodafes, LC <br />Isotopic samples for deuterium (SZH), oxygen-18 (5180), and tritium ('H) analyses were <br />collected, sealed, and preserved in appropriate glass or HDPE plastic bottles. Dissolved <br />inorganic carbon and SO; for carbopn-13 (S"C), sulfur-34 (S'°S), and carbon-14 ('°C) <br />analysis were precipitated with BaCI,•2HZ0. <br />Geochron Laboratories, Cambridge, Massachusetts performed stable isotopic analyses for <br />S'H, 5180, S"C, and S"S compositions and unstable "C contents. The University of Miami <br />Tritium Laboratory, Miami, Florida performed tritium analyses. Most tritium analyses were <br />performed using electrolytic enrichment and ]ow level counting methods. Some tritium <br />analyses were performed using direct counting methods. Mountain Mass Spectrometry, <br />Evergreen, Colorado, performed additional SZH and 5180 analyses. Laboratory reporting <br />• sheets for isotopic analyses are included as Appendix A <br />2.2.4 Data analysis <br />Geochemical, isotopic, discharge, and other data were compiled into electronic format and <br />were analyzed by graphical, statistical, and computer methods. Solute compositions were <br />graphically analyzed using Stiff (1951) diagrams. Mineral saturation indices were calculated <br />using the computer code WATEQF (Plummer and others, 1976). Groundwater "C residence <br />times were calculated using methods described by Fontes (1980), Mooke (1980), and Pearson <br />and Hanshaw (1970). <br />L~ <br />Characterization of Groundwater Systems in the Vicinity of the West Elk Mine, Somerset, Colorado <br />29 January 1999 <br />Page 8 <br />