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SPX CORPORATION ORDER R5-2019-0018 SPX MARLEY COOLING TECHNOLOGIES GROUNDWATER CLEANUP NPDES NO. CA0081787 MDELHH = multMDEL MELHH multAMEL where: mu1tAMEL = statistical multiplier converting minimum LTA to AMEL multMDEL = statistical multiplier converting minimum LTA to MDEL MA =statistical multiplier converting acute ECA to LTAacute Mc = statistical multiplier converting chronic ECA to LTAchmnic Summary of Water Quality-Based Effluent Limitations Discharge Point No. 001 Table F-9. Summary of Water Quality-Based Effluent Limitations Effluent Limitations Parameter Units Average Average Maximum Instantaneous Instantaneous Monthly Weekly Daily Minimum Maximum Chromium (VI), pg/L 4.9 -- 16 -- -- Dissolved Copper, Total pg/L 6.6 -- 17 -- -- Recoverable Electrical Conductivity pmhos/cm -- -- -- 1100' -- @ 25°C pH standard units -- -- -- 6.5 1 8.5 ,. Annual average effluent limitation. 5. Whole Effluent Toxicity (WET) For compliance with the Basin Plan's narrative toxicity objective, this Order requires the Discharger to conduct whole effluent toxicity testing for acute and chronic toxicity, as specified in the Monitoring and Reporting Program (Attachment E Section V.). This Order also contains effluent limitations for acute and chronic toxicity and requires the Discharger to implement best management practices to investigate the causes of and identify corrective actions to reduce or eliminate effluent toxicity. a. Acute Aquatic Toxicity. The Basin Plan contains a narrative toxicity objective that states, "All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life." (Basin Plan at page Section 3.1.20) The Basin Plan also states that, "...effluent limits based upon acute biotoxicity tests of effluents will be prescribed where appropriate...". For priority pollutants, the SIP dictates the procedures for conducting the RPA. Acute toxicity is not a priority pollutant. Therefore, the Central Valley Water Board is not restricted to one particular RPA method. Acute whole effluent toxicity is not a priority pollutant. Therefore, due to the site-specific conditions of the discharge, the Central Valley Water Board has used professional judgment in determining the appropriate method for conducting the RPA. U.S. EPA's September 2010 NPDES Permit Writer's Manual, page 6-30, states, "State implementation procedures might ATTACHMENT F— FACT SHEET F-29