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SPX CORPORATION ORDER R5-2019-0018 SPX MARLEY COOLING TECHNOLOGIES GROUNDWATER CLEANUP NPDES NO. CA0081787 effluent concentrations, which confirms that minimal flows in the canal (effluent TDS average was 534 mg/L). This is not typical and therefore is not representative of the normal conditions in the receiving water during the agricultural season. Considering the TDS data downstream of the discharge when agricultural irrigation is occurring, the discharge does not have reasonable potential for TDS. (c) WQBEL's. Although there is no reasonable potential to warrant effluent limits for salinity, this Order retains the effluent limitation of 1100 pmhos/cm as an annual average in a calendar year for Electrical conductivity from Order R5-2014-0013. This effluent limit for Electrical Conductivity is established based on the performance of the Facility and will ensure that the mass loading of salinity does not increase. Electrical Conductivity is being used as an indicator parameter for salinity. Constituents with Reasonable Potential. The Central Valley Water Board finds that the discharge has a reasonable potential to cause or contribute to an in-stream excursion above a water quality standard for chromium (VI), copper, and pH. WQBEL's for these constituents are included in this Order. A summary of the RPA is provided in Attachment G, and a detailed discussion of the RPA for each constituent is provided below. i. Chromium (VI) (Hexavalent Chromium) (a) WQO. The CTR includes maximum 1-hour average and 4-day average criteria of 16 pg/L and 11 pg/L, as dissolved metals respectively, for chromium (VI)for the protection of freshwater aquatic life. (b) RPA Results. The reported maximum effluent concentration (MEC) for dissolved chromium (VI) was 23.7 pg/L based on 48 samples collected between June 2014 and June 2018. Dissolved Chromium (VI) was not detected in the receiving water in 2 samples collected in the same time period. The MEC for dissolved chromium (VI) of 23.7 pg/L exceeds the CTR chronic criteria for aquatic life of 11.0 pg/L, therefore, dissolved chromium (VI) in the discharge has a reasonable potential to cause or contribute to an in-stream excursion above the CTR criteria for the protection of freshwater aquatic life. (c) WQBELs. This Order contains average monthly effluent limitation (AMEL) and maximum daily effluent (MDEL) for dissolved chromium (VI) of 4.9 pg/L and 16 pg/L, respectively, based on CTR criteria for the protection of fresh water aquatic life. These effluent limits are expressed as dissolved metals in accordance with 40 CFR 122.45(c)(3). (d) Plant Performance and Attainability. The Discharger operates treatment processes specific to the removal of chromium VI, and with proper operation of the existing treatment facilities, results of monitoring indicate the Discharger is capable of meeting the new effluent limitations. ii. Copper, Total Recoverable (a) WQO. The CTR includes hardness-dependent criteria for the protection of freshwater aquatic life for copper. These criteria for copper are presented in ATTACHMENT F- FACT SHEET F-25