Laserfiche WebLink
LTA COMMERCIAlTESTING b ENGINEERING CO. <br />ABSTRACT <br />Results of past acute bioassays indicate that effluent discharged from outfall 017 is acutely toxic <br />to Daphnia magna. The Mountain Coal Company discharge permit states that the facility must <br />conduct either a Preliminary Toxicity Identification evaluation (PTI) or a Toxicity Identification <br />Evaluation (TIE) once a "pattern of toxicity" has been established. Commercial Testing and <br />Engineering, Co. (CT&E) opted, with permission by Mountain Coal Co., to conduct an acute <br />Preliminary Toxicity Identification (PTI) on ell7uent discharged by Mountain Coa] Company. <br />The purpose of this PTI was to determine the possible cause(s) of the acute toxicity to Daphnia <br />magna. <br />The results were somewhat conclusive, but the exact source of toxicity could not be gleaned <br />from any one or set of characterizations. However, the evidence suggests that the acute toxicity <br />is perhaps due to a combination of cationic metals and cationic surfactants, based on the results <br />of the effluent manipulations. Furthermore, the results provided dual evidence that total <br />dissolved solids (TDS) may or may not be the toxicant in question. Please see the Discussion <br />section for further explanation. <br />1 <br />