FIELD DOCUMENTS AND WORK PLANS 2000-2003

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WASTE DISCHARGE REQUAENTS ORDER NO.R5-2002-XXXX 6 MARLEY COOLING TOWER COMPANY SAN JOAQUIN COUNTY flows within the Stockton Diverting Canal help support the cold-water aquatic life. Both conditions may exist within a short time span, where the Stockton Diverting Canal would be dry without the discharge and periods when sufficient background flows provide hydraulic continuity with the Calaveras River. The lack of dilution results in more stringent effluent limitations to protect contact recreational uses, drinking water standards, agricultural water quality goals and aquatic life. Significant dilution may occur during the irrigation season, and immediately following high rainfall events. The Discharger may conduct flow monitoring of the Stockton Diverting Canal to determine the actual flow regime. To the extent seasonal assimilative capacity is available in the receiving water to accommodate constituents in the effluent which exceed reasonable potential criteria, this permit contains a re-opener to consider final effluent limitations based upon demonstrated assimilative capacity. However, effluent limitations contained in this permit do not account for the receiving waters having assimilative capacity. The Discharger may submit additional receiving water characterization to demonstrate the flow regime and pollutant assimilative capacity and ask the Regional Board to re-open the permit to consider this new information. 16. USEPA adopted the National Taxies Rule (NTR) on 5 February 1993 and the California Toxics Rule (CTR) on 18 May 2000. These Rules contain water quality standards applicable to this discharge. The State Water Resources Control Board (SWRCB) adopted the Policy for Implementation of Toxics Standards for Inland Surface Waters, Enclosed Bays, and Estuaries of California (known as the State Implementation Policy or SIP),which contains guidance on implementation of the NTR and the CTR. 17. Federal regulations require effluent limitations for all pollutants that are or maybe discharged at a level that will cause or have the reasonable potential to cause, or contribute to an in-stream excursion above a narrative or numeric water quality standard. The absence of a limitation for a constituent indicates either a lack of information is available for evaluation, or the constituent does not have the reasonable potential to cause, or contribute to an in-stream excursion above a narrative or numeric water quality standard. As a means of collecting additional information necessary to conduct a complete reasonable potential analysis, this Order contains provisions that: a. Require the Discharger to conduct a study and provide information as to whether the levels of NTR, CTR, or other pollutants in the discharge have the reasonable potential to cause or contribute to an in-stream excursion above a numeric or narrative water quality standard, including Basin Plan numeric or narrative objectives and NTR and CTR pollutants; b. If pollutants in the discharge have a reasonable potential to cause or contribute to an in- stream excursion above a water quality standard, requires the Discharger to submit information to calculate effluent limitations for those pollutants; and c. Allow the Regional Board to reopen this Order and include effluent limitations for those pollutants.