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SPX CORPORATION ORDER R5-2019-0018 <br /> SPX MARLEY COOLING TECHNOLOGIES GROUNDWATER CLEANUP NPDES NO. CA0081787 <br /> Toxicity Reduction Evaluation (TRE) <br /> TRE is a study conducted in a step-wise process designed to identify the causative agents of effluent or <br /> ambient toxicity, isolate the sources of toxicity, evaluate the effectiveness of toxicity control options, and <br /> then confirm the reduction in toxicity. The first steps of the TRE consist of the collection of data relevant <br /> to the toxicity, including additional toxicity testing, and an evaluation of facility operations and <br /> maintenance practices, and best management practices. A Toxicity Identification Evaluation (TIE) may <br /> be required as part of the TRE, if appropriate. (A TIE is a set of procedures to identify the specific <br /> chemical(s) responsible for toxicity. These procedures are performed in three phases (characterization, <br /> identification, and confirmation) using aquatic organism toxicity tests.) <br /> ATTACHMENT A- DEFINITIONS A-5 <br />