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Feasibility Evaluation of the Arkansas Valley Pipeline <br />Water Works! Committee <br />June 2003 <br />regulations in order to seal off the lower formations and the Cheyenne and Dakota <br />Formations. A well log showing this type of well and cross-section of the formations is <br />provided in Appendix D. <br />In June 1969, the Office of Saline Water, U.S. Department of the Interior, published a Study <br />of Deep-Well Disposal of Desalination Brine Waste. This report was developed as a <br />feasibility study for disposal of RO waste brine for the City of Fort Morgan. This study was <br />completed before UIC regulations on this type of disposal were implemented by EPA. In this <br />study, the estimated cost of installing a single disposal well to inject 400 gpm of waste brine <br />to a depth of 7,500 feet was $262,300. This study estimated annual pumping costs for 1.0 <br />mgd at approximately $120,000. <br />If these costs are pro-rated to represent injection of 150 gpm of waste brine to a depth of <br />5,500 feet and updated to 2002 costs using Engineering News-Record 's 20-City Average <br />Construction Cost Index, this same well could be expected to cost approximately $370,000 <br />dollars in May 2002, with an annual pumping cost of approximately $223,000 (based on <br />$0.08/kwh). <br />The costs outlined above do not include any surface equipment costs (e.g. pumps, storage <br />tanks), pipeline from the RO plant to the underground injection well, permitting costs, <br />engineering and/or consulting fees, monitoring costs, mechanical integrity testing costs, or <br />any other costs that could be incurred if this method of disposal were selected by <br />municipalities in the Lower Arkansas River Valley. <br />Conclusions and Recommendations Regarding Deep-Well Injection <br />Conclusions and recommendations based on the preliminary feasibility investigation of <br />Deep-well injection of RO reject include: <br />Based on information discussed herein, Class I underground injection wells appear to <br />be the most likely feasible solution for disposing of RO reject available to <br />municipalities and water and sanitation districts in the Lower Arkansas River Valley. <br />Considerable additional investigation, however, would be necessary to confirm the <br />feasibility of Class I injection wells for this purpose in the Lower Arkansas River <br />Valley <br />2. A preliminary opinion of probable cost for constructing a Class I underground <br />injection well in Southeastern Colorado that would be adequate for disposing of the <br />Las Animas' RO reject is estimated to be in the range of $250,000-$350,000. If <br />pumping is required, O&M costs are estimated to be in the range of $250,000 per <br />year fora 150 gpm well. <br />44 <br />GEI Consultants, InC. 0128a 03-06-30 Feasibility Evaluation Final <br />