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•T ~^~ COMMERCIAL TE6TING d ENGINEERING CO. <br />%ABSTRACT <br />Results of past acute bioassays indicate that effluent discharged from outfall 001 is acutely toxic <br />to Ceriodaphnia dzrbia. The Bear Coal Company discharge permit states that the facility must <br />conduct either a Preliminary Toxicity Identi&cation evaluation (PTI) or a Toxicity Identification <br />Evaluation (TIE) once a "pattern of toxicity" has been established. Commercial Testing and <br />Engineering, Ca (CT&E) opted, with permission by Bear Coal Co., to conduct an acute <br />Preliminary Toxicity Identification (PTI) on effluent discharged by Bear Coal Company. The <br />purpose of this PTI was to determine the possible cause(s) of the acute toxicity to Ceriodaphnia <br />dzrbia. The test organism utilized was the cladoceran, Ceriodaphnia dubia. The results were <br />very conclusive. The evidence strongly suggests that the acute toxicity is due to total dissolved <br />solids (TDS) based on the results of the effluent manipulations. <br />a <br />Ir <br />F-s2s <br />1 <br />