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WASTE DISCHARGE REQUTIZENIENTS ORDER NO. R5-2003-XXXX • 13 SPX CORPORATION MARLEY COOLING TOWER COMPANY SAN JOAQUIN COUNTY concentration, and 19 µg/L (ppb) as a 1-hour average (acute) concentration for total residual chlorine. Based upon results of monitoring, the Regional Board finds that the discharge does have a reasonable potential to cause or contribute to an in-stream excursion above a water quality objective. This Order includes new maximum daily(0.02 mg/L (ppm)) and avemp monthly (0.61 mg/l (ppm)) effluent limitations for residual chlorine based upon the USEPA criteria. Previous Orders did not include effluent limitations for chlorine. The source of chlorine is unknown, therefore it is unknown whether the Discharger can immediately comply with these new limitations. Dechlorination techniques are readily available for interim trea=ent to maintain comptaince with these new limitations. 26. In the past, results of effluent chronic toxicity testing using EPA/600/4-91/002 have indicated sporadic instances of sub lethal test organism impacts. Also, previous Order No. 93-221 included an effluent limitation for acute toxicity. This new Order retains an effluent limitation for acute toxicity, and includes continued monitoring of effluent and receiving water for chronic toxicity. 27. The beneficial uses of the underlying groundwater are municipal and domestic, ydustrial, and agricultural supply. 28. The permitted discharge is consistent with the antidegradation provisions of 40 CFR 131.12 and SWRCB Resolution 68-16. Compliance with these requirements will result in the use of best practicable treatment or control of the discharge. The impact on existing water quality will be insignificant. 29. Effluent limitations, and toxic and pretreatment effluent standards established pursuant to Sections 301 (Effluent Limitations), 302 (Water Quality Related Effluent Limitations), 304 (Information and Guidelines), and 307 (Toxic and Pretreatment Effluent Standards) of the Clean Water Act (CWA) and amendments thereto are applicable to the discharge. 30. The action to adopt an NPDES permit is exempt from the provisions of Chapter 3 of the California Environmental Quality Act(CEQA) (Public Relations Code Section 21000, et. Seq.), in accordance with Section 13389 of the California Water Code. 31. The Regional Board has considered the information in the attached Information Sheet in developing the Findings of this Order. The attached Information Sheet is part olfihis Order. Attachments A, B, C, D, and E are also a part of this Order. 32. The Regional Board has notified the Discharger and interested agencies and per-sons of its intent to prescribe waste discharge requirements for this discharge and has provided them with an opportunity for a public hearing and an opportunity to submit their written vie-vs and recommendations.