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DocuSign Envelope ID: EBE28081-13782-41342-BAD13-D8C9313687131B <br />TOXICITY REDUCTION EVALUATION LINES OF INVESTIGATION <br />ABBREVIATIONS <br />CDPS <br />Colorado Discharge Permit System <br />Colowyo <br />Elk Ridge Mining and Reclamation's Colowyo Mine <br />EPA <br />Environment Protection Agency <br />gpm <br />Gallons per minute <br />pmhos/cm <br />Micromhos per centimeter <br />RO <br />Reverse osmosis <br />SRB <br />Sulfate -reducing bacteria <br />Stantec <br />Stantec Consulting Services, Inc. <br />TDS <br />Total dissolved solids <br />TOC <br />Total organic carbon <br />THE <br />Toxicity Reduction Evaluation <br />WET <br />Whole effluent toxicity <br />