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COMMERCIAL TESTING & ENGINEERING CO. <br />~t~ <br />NARRATIVE <br />• CLIENT <br />Bear Coal Company, P.O. Box 1754, Paonia, CO 81428 <br />• DATE OF REPORT <br />July 24, 2002 <br />• PERMIT AND SAMPLE INFORMATION <br />NPDES permit #: <br />Type of sample: <br />Date and time of sample(s): <br />Date and time of initial toxicity test start: <br />Dilution water: <br />• TEST ORGANISMS <br />Ceriodaphnia dubia <br />• PROCEDURE <br />CO-0044377 <br />Effluent Grab <br />07/15/02 0930 <br />07/16/02 0755 <br />Reconstituted Laboratory Water <br />Age: <24 hrs <br />Acute, 48 hour bioassays as outlined in the most recent protocols specified by the <br />Water Quality Control Division of the Colorado Department of Health (1998), with <br />reference to the EPA's Methods for Aquatic Toxicity Identification Evaluations. Phase I <br />Toxicity Characterization Procedures. (EPA/600/3-88/034 September ] 988). <br />• DISCUSSION <br />CT&E conducted a Preliminary Toxicity Identification evaluation to confirm Total <br />Dissolved Solids toxicity. The derived evidence strongly indicates that Total Dissolved <br />Solids is contributing to acute toxicity towazds Ceriodaphnia dubia. Please see the <br />expanded discussion section. <br />