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SPX CORPORATION ORDER R5-2019-0018 SPX MARLEY COOLING TECHNOLOGIES GROUNDWATER CLEANUP NPDES NO. CA0081787 dissolved concentrations, as 1-hour acute criteria and 4-day chronic criteria. USEPA recommends conversion factors to translate dissolved concentrations to total concentrations. Default USEPA translators were used for the receiving water and effluent. (b) RPA Results. Section IV.C.2 of this Fact Sheet includes procedures for conducting the RPA for hardness-dependent CTR metals, such as copper. The CTR includes hardness-dependent criteria for copper for the receiving water. The MEC for copper was 69.3 pg/L based on 47 samples collected between January 2014 and June 2018. The maximum observed upstream receiving water copper concentration was 2.7 pg/L, based on 2 samples collected in March 2014 and June 2018. The RPA was conducted using the upstream receiving water hardness to calculate the criteria for comparison to the maximum ambient background concentration, and likewise using the reasonable worst-case downstream hardness to compare the maximum effluent concentration (as seen in Section IV.C.2 of this Fact Sheet). Table F-4 above shows the specific total recoverable criteria used for the RPA. Based on the available data, the receiving water and copper in the discharge have reasonable potential to cause or contribute to an in-stream excursion above the CTR criteria for the protection of freshwater aquatic life. (c) WQBELs. The MEC for copper of 69.3 pg/L was collected on 27 April 2017. The abnormally high copper concentration of 69.3 lag/L is indicative of breakthrough occurring in the treatment system, not a result during normal operating conditions. The treatment system typically produces a stable effluent copper concentration. Since WQBELs are calculated considering the variability of the treatment system, using the high datapoint during treatment system upset would result in overly stringent WQBELs. Therefore, for the purposes of calculating the WQBELs, the unusually high result on 27 April 2017 was removed from the dataset when calculating the coefficient of variation. This Order contains a final (AMEL) and (MDEL) for copper of 6.6 lag/L and 17 lag/L, respectively, based on the CTR criterion for the protection of freshwater aquatic life. (d) Plant Performance and Attainability. The Discharger operates treatment processes specific to the removal of copper, and with proper operation of the existing treatment facilities, results of monitoring indicate the Discharger is capable of meeting the updated effluent limitations. iii. pH (a) WQO. The Basin Plan includes a water quality objective for surface waters (except for Goose Lake) that the "...pH shall not be depressed below 6.5 nor raised above 8.5." (b) RPA Results. Federal regulations at 40 C.F.R. §122.44(d)(1)(i) requires that, "Limitations must control all pollutants or pollutant parameters (either conventional, nonconventional, or toxic pollutants) which the Director determines are or may be discharged at a level which will cause, have the ATTACHMENT F- FACT SHEET F-26