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Test Summary <br />Toxicity Characterization <br />CLIENT: Somerset Mining Co., P.O Box 535, Somerset CO 81434 <br />DATE: October 29, 1993 <br />PERMIT AND SAMPLE INFORMATION <br />NPDES #: CO- 0000132 <br />Type of Sample: Effluent & B-Seam Spring Grabs <br />Date & Time of Sampling: 10-11-93/9:45am & 9:15am <br />Date Received at CT&E: 10-12-93/10:15am <br />Date L Time of Test Start: 10-12-93/14:00 <br />Dilution Water: Reconstituted Laboratory Water <br />TEST ORGANISMS AND PROCEDURE <br />Organism: Ceriodaohnia dubia Age: <24hrs <br />Procedure: Acute, 48 hour bioassays as outlined in <br />Methods for Measuring the Acute Toxicity of Effluents <br />and Receiving Waters to Freshwater and Marine <br />Organisms - 4th Edition - EPA, 1991. <br />Method of Toxicant Identification: Selective Tests as <br />outlined in "Methods for Aquatic Toxicity Identification <br />Evaluations-Phase I Toxicity Characterization <br />Procedures", EPA-600/6-91/003, Feb. 1991. <br />RESIILTS - <br />Effluent Toxicity Test <br />B-Seam Toxicity Test <br />NaCl Mock Effluent <br />NaHC03 Mock Effluent <br />NaCl Mock B-Seam <br />NaHCOl Mock B-Seam <br />LCSO = 59% Effluent <br />LCSO = 61% Spring Water <br />LCso = 87% Stock <br />LCso = 29% Stock <br />LCso = 89% Stock <br />LCSO = 27% Stock Water <br />EDTA Chelation Test - 1000 Mortality in all Samples <br />Tested - 100% Effluent, Spring Water and Mock NaHC03 <br />Effluent. No evidence of toxic metal chelation. <br />DISCUSSION - See Report, Paqe 5, for Detailed Discussion <br />COMMER CIAL TESTING & ENGINEE RING CO. <br />=fib ~~~ <br />~o~n ai Waterm arketl Foy Yom Protection <br />