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SPX CORPORATION ORDER R5-2019-0018 SPX MARLEY COOLING TECHNOLOGIES GROUNDWATER CLEANUP NPDES NO. CA0081787 (B) receiving water metal concentration greater than CTR criteria, then return to bullet 1, selecting a lower ambient hardness value. The CTR's hardness dependent metals criteria equations contain metal-specific constants, so the criteria vary depending on the metal. Therefore, steps 1 through 3 must be repeated separately for each metal until ambient hardness values are determined that will result in criteria and effluent limitations that comply with the CTR and protect beneficial uses for all metals. Results of iterative analysis The above iterative analysis for each CTR hardness-dependent metal results in the selected ambient hardness values shown in Table F-4, above. Using these hardness values to calculate criteria, which are actual sample results collected in the receiving water, will result in effluent limitations that are protective under all ambient flow conditions. Copper and silver are used as examples below to illustrate the results of the analysis. Tables F-5 and F-6 below summarize the numeric results of the three-step iterative approach for copper and silver. As shown in the example tables, ambient hardness values of 56 mg/L (copper and silver) are used in the CTR equations to derive criteria and effluent limitations. Then under the "check" step, worst-case ambient receiving water conditions are used to test whether discharge results in compliance with CTR criteria and protection of beneficial uses. The results of the above analysis, summarized in the tables below, show that the ambient hardness values selected using the three-step iterative process results in protective effluent limitations that achieve CTR criteria under all flow conditions. Tables F-5 and F-6 below, summarize the critical flow conditions. However, the analysis evaluated all flow conditions to ensure compliance with the CTR criteria at all times. Table F-5. Verification of CTR Compliance for Copper Receiving water hardness used to compute effluent limitations 56 mg/L Effluent Concentration Allowance (ECA)for Copper' 11.1 pg/L Downstream Ambient Concentrations Under Worst- Case Ambient ReceivingWater Conditions Ambient Copper Complies with CTR Criteria Concentration' CTR Criteria? Hardness (Ng/L) pg/L) 1Q10 124 11 11 Yes 7Q10 124 11 11 Yes Max receiving water flow 56 5.7 5.7 Yes ' The ECA defines effluent quality necessary to meet the CTR criteria in the receiving water. There is no effluent limitation for copper as it demonstrates no reasonable potential. 2 This concentration is derived using worst-case ambient conditions. These conservative assumptions will ensure that the receiving water always complies with CTR criteria. ATTACHMENT F— FACT SHEET F-20