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SPX CORPORATION ORDER R5-2019-0018 <br /> SPX MARLEY COOLING TECHNOLOGIES GROUNDWATER CLEANUP NPDES NO. CA0081787 <br /> • . ADAPTATION <br /> protective,-Select ambient hardness from -If discharge is Figure F-1,calculate criteria using . .. ambient hardness is selected <br /> the CTR equations and . If discharge is not protective, <br /> corresponding . <br /> concentration necessary to meet ambient hardness <br /> calculated criteria in the <br /> receiving water <br /> 1. CRITERIA CALCULATION. CTR criteria are calculated using the CTR <br /> equations based on actual measured ambient hardness sample results, <br /> starting with the maximum observed ambient hardness of 374 mg/L. Effluent <br /> metal concentrations necessary to meet the above calculated CTR criteria in <br /> the receiving water are calculated in accordance with the SIP.9 This should not <br /> be confused with an effluent limit. Rather, it is the Effluent Concentration <br /> Allowance (ECA), which is synonymous with the wasteload allocation defined <br /> by U.S. EPA as "a definition of effluent water quality that is necessary to meet <br /> the water quality standards in the receiving water."10 If effluent limits are found <br /> to be needed, the limits are calculated to enforce the ECA considering effluent <br /> variability and the probability basis of the limit. <br /> 2. CHECK. U.S. EPA's simple mass balance equation" is used to evaluate if <br /> discharge at the computed ECA is protective. Resultant downstream metal <br /> concentrations are compared with downstream calculated CTR criteria under <br /> reasonable worst-case ambient conditions. <br /> 3. ADAPT. If step 2 results in: <br /> (A) receiving water metal concentration that complies with CTR criteria under <br /> reasonable worst-case ambient conditions, then the hardness value is <br /> selected. <br /> 9 SIP Section 1.4.B, Step 2, provides direction for calculating the Effluent Concentration Allowance. <br /> 10 U.S. EPA Technical Support Document for Water Quality-based Toxics Control (TSD), pg. 96. <br /> 11 U.S. EPA NPDES Permit Writers' Handbook (EPA 833-K-10-001 September 2010, pg. 6-24) <br /> ATTACHMENT F— FACT SHEET F-19 <br />