"The production of fossil fuel by In situ techniques can yield large quantities of water. This water whether from intrusion combustion, or process will be contaminated with water soluble organic compounds. The analysis of the organic material is important not only from the standpoint of selecting control technologies to purify the water but also in monitoring these technologies for efficiency. Combined gas chromatography/mass spectroscopy was used to analyze the extractable organic material in water produced during Laramie Energy Research Center's second in situ tar sand combustion. Fractions of organic material defined as acid and base extracts were obtained by liquid extraction using either trlchlorotrlfluorethane or ethyl ether. The acid extracts were directly analyzed by GC/MS which resulted in identification of individual components. The base extracts were found to be more complex and could no be studied directly with GC/MS. Fractions of the base extract were obtained by trapping intervals of the effluent from the GC separation of the base extract using an OV-101 column. The fractions were chromatographed on an SP-1000 column for GC/MS investigations. Combined gas chromatography/mass spectroscopy of these samples permitted the identification of individual components, but this is time consuming and not applicable to routine screening of samples. Using selected computer techniques, fewer mass spectrometric experiments were required for routine analysis of the samples."