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NORTHERN CALIFORNIA POWER AGENCY <br /> STIG PROJECT, LODI, CALIFORNIA <br /> EVALUATION OF WATER COMPOSITION <br /> FOR DISPOSAL BY INJECTION <br /> DON MICHELS ASSOCIATES <br /> Missoula, Montana, USA <br /> 406/728-2576 <br /> I. INTRODUCTION <br /> This evaluation considers a sub-surface disposal option for selected waste waters associated <br /> with the STIG electric power generation project.Specific issues concern whether or not the liquid <br /> may be chemically reactive to yield precipitates that might reduce rock permeability or react with <br /> the rock materials in a way detrimental to sustained injection. A thorough description of the <br /> project appears in the UIC Permit application. Sections B4 and HK contain basic information <br /> about water compositions, plant design, and operating parameters which have been applied to this <br /> evaluation. <br /> This evaluation includes a description of how relevant estimates of water compositions <br /> were obtained, application of a computer model to identify mineral saturations, and brief <br /> discussions about minerals or mineral components that are potential deposits (scales). Silica is <br /> found to be a critical component that will cause the combined waste water stream to be not <br /> injectable for about one-third of the the time. Recommendations are made for recognizing the <br /> unfavorable conditions and for achieving timely diversions of waste water flow away from the <br /> injection well. The water, with the proposed processing and treatments, is otherwise generally <br /> compatible with injection disposal of selected liquid wastes. <br />