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Feasibility Evaluation of the Arkansas Valley Pipeline <br />Water Works! Committee <br />June 2003 <br />The future feasibility of this alternative for lower Arkansas River basin municipalities and <br />W&S districts will depend on future CDPHE requirements for disposal of RO reject. <br />Evaporation and Landfill Disposal <br />Calculations to determine an opinion of probable cost for this alternative indicate this <br />alternative is not feasible because of the cost of the very large concrete-lined drying beds that <br />would be required. <br />Deep Well Injection <br />Preliminary calculations for opinions of probable-cost for deep well injection disposal of RO <br />reject from municipalities and W&S districts in the lower Arkansas valley indicate a cost of <br />$1 to $2 per thousand gallons for deep well injection. These calculations are very <br />preliminary and a much more extensive feasibility investigation would need to be completed <br />before determining the utilization of this alternative for RO reject disposal in the lower <br />Arkansas River basin. <br />Use RO Reject as Industrial or Mining Water Supply <br />This would require locating an industry in the lower Arkansas River basin that would be <br />willing to accept the RO reject for use as a water supply. The feasibility of locating such an <br />industry is not known. <br />Vapor Compression and Crystallization <br />The industrial evaporation process was reportedly considered for application to RO reject in <br />the Phoenix area but rejected on the basis of cost. <br />Land Disposal and Irrigation <br />This alternative would require irrigating salt tolerant species of crops. The best information <br />Brown & Caldwell has been able to obtain concerning the concentration of Las Animas' RO <br />reject is that the average concentration is approximately 6,000 mg/1 of mainly totally <br />dissolved solids (TDS). In Brown & Caldwell's experience, there are no crops that could be <br />grown in the lower Arkansas River basin with an irrigation water supply containing 6,000 <br />mg/1 of TDS. <br />39 <br />GEI Consultants, I11C. 01284 03-06-30 Feasibility Evaluation Final <br />