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WASTE DISCHARGE REQUALNTS ORDER NO.R5-2002-XXXX 8 MARLEY COOLING TOWER COMPANY SAN JOAQUIN COUNTY no credit provided for dilution. Since a site-specific translator has not been developed for copper as described in the SIP Section 1.4.1, the USEPA conversion factor was used in expressing the dissolved copper criterion as total recoverable. Acute and chronic effluent concentration allowance's (ECA's)were set equal to the adjusted acute and chronic copper criterion, and the most limiting long-term average (LTA) discharge condition for copper was determined from Table I of the SIP, using a coefficient of variation of 0.6. The average monthly effluent limitation(AMEL) and maximum daily effluent limitation (MDEL)were then calculated using multipliers in Table 2 of the SIP. New final average monthly(3.3 µg/l, (ppb) @ 44 mg/L(ppm)hardness as CaCO3) and daily maximum (6.5 µg/L(ppb) @ 44 mg/L(ppm)hardness as CaCO3) effluent limitations for copper (total)have been established in this Order in accordance with Sections 1.3 and 1.4 of the SIP using the adjusted copper criteria. These limitations will be adjusted accordingly with results of corresponding receiving water monitoring for hardness. The Discharger operates treatment processes specific to the removal of copper. With proper operation of the existing treatment facilities, results of monitoring indicate the Discharger is capable of meeting the new daily maximum effluent limitation, therefore a time schedule for compliance with this limitation is not included in this new Order. However,results of monitoring are not sufficient to determine if the Discharger can meet the new monthly average effluent limitation for copper of 3.3 µg/L (ppb) @ 44 mg/L(ppm) hardness as CaCO3. Data submitted by the Discharger indicates that, when the facility is properly operated, final effluent concentrations of copper are reported to be less than the detection limit of 5 µg/L(ppb). Historical data are not of sufficient quality to determine compliance with the new monthly average limitation. Detection of copper to 0.5 µg/L(ppb) is feasible in accordance with the SIP. This Order includes a Provision which requires the Discharger to collect data sufficient to determine compliance with this new monthly average effluent limitation for copper. As provided in Section 2.1 of the SIP, a time schedule is included in this Order to allow the Discharger to achieve compliance with the new monthly average effluent limitation for copper. In accordance with the SIP, Sections 2.2, a numeric monthly average interim limitation for copper is established in this Order based upon current treatment facility performance. Since the treatment facilities can, when properly operated, produce and effluent with copper concentrations less than 5 µg/L(ppb), this Order includes a performance based interim average monthly effluent limitation for copper set at this historical limit of detection of 5 gg/L(ppb). This interim limitation shall be an enforceable limitation until the final monthly average effluent limitation becomes effective on 1 October 2007. 20. Previous Order No. 93-221 included daily maximum and monthly average effluent limitations for hexavalent chromium based upon water quality objectives established by the California Inland Surface Waters Plan. Order No. 93-221 included a daily maximum limitation for hexavalent chromium of 11 µg/L(ppb), and a monthly average limitation for hexavalent chromium of 11 µg/L (ppb). New limits for hexavalent chromium have been established in this new Order based upon the reasonable potential to exceed the chronic freshwater aquatic life criterion in the CTR(new information). Results of final effluent monitoring indicate maximum effluent concentrations (MEC's) of hexavalent chromium have been high as 17 µg/L(ppb)