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SPX CORPORATION ORDER R5-2019-0018 SPX MARLEY COOLING TECHNOLOGIES GROUNDWATER CLEANUP NPDES NO. CA0081787 Evaluations (TREs)for Selenastrum capricornutum in 2015, C. dubia in 2015, and C. dubia in 2017. The 2015 TREs concluded the toxicity was caused by polymer coagulant overdosing and as a result, the Discharger adjusted polymer dosing and the toxicity caused by polymer overdosing has since been eliminated. The 2017 TRE showed there was a groundwater gradient shift, which may have been caused by extreme wet weather. As a result, the Discharger has made operational adjustments to address reduced hardness and EC in the groundwater being treated. The Discharger also failed the June 2018 toxicity test; however, this was quickly determined to be the result of a plant upset caused by bringing the Facility back online after a 4-month shutdown where significant repairs were required due to vandalization which occurred during the shutdown. The Discharger has made repairs and toxicity has been eliminated in the last two normal toxicity tests. Therefore, the discharge does not have reasonable potential to cause or contribute to an instream exceedance of the Basin Plan's narrative toxicity objective. D. Final Effluent Limitation Considerations 1. Mass-based Effluent Limitations 40 C.F.R section 122.45(f)(1) requires effluent limitations be expressed in terms of mass, with some exceptions, and 40 C.F.R. section 122.45(f)(2) allows pollutants that are limited in terms of mass to additionally be limited in terms of other units of measurement. This Order includes effluent limitations expressed in terms of mass and concentration. In addition, pursuant to the exceptions to mass limitations provided in 40 CF.R. section 122.45(f)(1), some effluent limitations are not expressed in terms of mass, such as pH and temperature, and when the applicable standards are expressed in terms of concentration (e.g., CTR criteria and MCL's) and mass limitations are not necessary to protect the beneficial uses of the receiving water. 2. Satisfaction of Anti-Backsliding Requirements The effluent limitations in this Order are at least as stringent as the effluent limitations in the previous Order, with the exception of effluent limitations for total chromium. The effluent limitations for these pollutants are less stringent than those in Order R5-0214- 0013. This relaxation of effluent limitations is consistent with the anti-backsliding requirements of the CWA and federal regulations. a. CWA section 402(o)(1) and 303(d)(4). CWA section 402(o)(1) prohibits the establishment of less stringent water quality-based effluent limits "except in compliance with Section 303(d)(4)." CWA section 303(d)(4) has two parts: paragraph (A) which applies to nonattainment waters and paragraph (B) which applies to attainment waters. i. For waters where standards are not attained, CWA section 303(d)(4)(A) specifies that any effluent limit based on a TMDL or other WLA may be revised only if the cumulative effect of all such revised effluent limits based on such TMDL's or WLAs will assure the attainment of such water quality standards. ii. For attainment waters, CWA section 303(d)(4)(B) specifies that a limitation based on a water quality standard may be relaxed where the action is consistent with the antidegradation policy. The Stockton Diverting Canal is considered an attainment water for total chromium because the receiving water is not listed as impaired on the 303(d) list for this ATTACHMENT F- FACT SHEET F-32