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DocuSign Envelope ID: EBE28081-13782-41342-BAD13-D8C9313687131B <br />12/31 /2020 Colowyo Mine CDPS #CO-0045161 CS010 Compliance Schedule Report - Attachment A <br />® Stantec <br />Toxicity Reduction Evaluation — <br />Lines of Investigation <br />Colowyo Mine Outfall 010 <br />March 20, 2020 <br />Prepared for: <br />Elk Ridge Mining and Reclamation <br />Craig, CO <br />Prepared by: <br />Stantec Consulting Services Inc. <br />2000 South Colorado Blvd, Suite 2-300 <br />Denver, CO 80222 <br />