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SPX CORPORATION ORDER R5-2019-0018 <br /> SPX MARLEY COOLING TECHNOLOGIES GROUNDWATER CLEANUP NPDES NO. CA0081787 <br /> similar treatment systems have been experiencing intermittent low level toxicity. <br /> The dischargers have not been successful identifying the cause of the toxicity <br /> because of the low toxicity signal and the intermittent nature of the toxicity. Due to <br /> these challenges, the Central Valley Clean Water Association (CVCWA), in <br /> collaboration with staff from the Central Valley Water Board, has initiated a Special <br /> Study to Investigate Low Level Toxicity Indications (Group Toxicity Study). This <br /> Order allows the Discharger to participate in an approved TES, which may be <br /> conducted individually or as part of a coordinated group effort with other similar <br /> dischargers that are exhibiting toxicity. Although the current CVCWA Group <br /> Toxicity Study is related to low-level toxicity, participation in an approved TES is not <br /> limited to only low-level toxicity issues. <br /> See the WET Monitoring Flow Chart (Figure F-2), below, for further clarification of <br /> the decision points for determining the need for TES/TRE initiation. <br /> ATTACHMENT F- FACT SHEET F-36 <br />