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CONCLUSION <br />The purpose of conducting the Phase I TIE was to further <br />characterize the effluent toxicity, discern potential toxicants <br />other than TDS and to assess the feasibility or appropriateness of <br />effluent toxicity treatment in the laboratory. <br />Each effluent manipulation conducted during the Toxicity <br />Identification Evaluation is designed to address different types of <br />toxicant(s) or toxicant characteristics. For example, if organic <br />chemicals are present as the predominate toxicant, manipulations <br />such as aeration and C1e filtration will often reduce toxicity. <br />Toxicity due to metals would often be indicated by a reduction in <br />toxicity in the EDTA, pH 11 adjustment, and/or the graduated pH and <br />oxidation/reduction tests. Phase I TIE test manipulations are not <br />designed for addressing TDS toxicity, rather TDS is suspected when <br />other "toxicant specific" manipulations do not reduce toxicity. For <br />outfall 011, toxicity was significantly removed only by the pH 3 <br />adjustment test at 50~ effluent and at pH 6 in the 100$ effluent. <br />The results of this test series, as in past experimental tests, <br />indicate that outfall 011 toxicity to C. dubia is primarily due to <br />TDS. Therefore, it is suspected that TDS, predominately sodium bi- <br />carbonate, remains responsible for the effluent toxicity. <br />10 <br />COMMERCIALTESTING & ENGIN EERING CO. <br />F-488 L~~ <br />Original Watermarked For Vour Protection ,...... <br />