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INFORMATION SHEET <br /> 10 <br /> WASTE DISCHARGE REQUIRMENTS ORDER NO.R5-2003-XXXX <br /> SPX CORPORATION <br /> MARLEY COOLING TOWER COMPANY <br /> STOCKTON, SAN JOAQUIN COUNTY <br /> Total Chromium <br /> Previous Order No. 93-221 included effluent limitations for total chromium based upon the <br /> protection of human health. For Chemical Constituents at page III-3.00, the Basin Plan states `At a <br /> minimum, water designated for use as domestic or municipal supply (MUN) shall not contain <br /> concentrations of chemical constituents in excess of the maximum contaminant levels (LICLs) <br /> specified in the following provisions of Title 22 of the California Code of Regulations...' As a <br /> result, and considering the fact that the Stockton Diverting Canal provides little or no dilution, this <br /> Order retains the 50 gg/L (ppb) monthly average effluent limitation for total chromium which is <br /> necessary to comply with the primary California MCL contained in Title 22, California Code of <br /> Regulations (CCR) and incorporated as chemical constituent water quality objectives in the Basin <br /> Plan. The Discharger operates treatment facilities specific to the removal of chromium. Results of <br /> effluent monitoring indicate the treatment facilities, when properly operated, are capable of <br /> reducing concentrations of total chromium below this existing limitation <br /> Arsenic <br /> Previous Order No. 93-221 included effluent limitations for arsenic based upon the protection of <br /> human health. The Basin Plan states that waters shall not contain chemical constituents in <br /> concentrations that adversely affect beneficial uses. At a minimum, water designated for use as <br /> domestic and/or municipal supply shall not contain concentrations of chemical constituents in <br /> excess of maximum contaminant levels (MCLs). The new USEPA primary MCL for arsenic is <br /> 10 µg/L(ppb). Federal regulations at 40 CFR Section 122.44(d)(1)(vi)(A) allow the state to <br /> establish effluent limitations using an explicit state policy interpreting its narrative objectives. Use <br /> of the USEPA Primary MCL is appropriate to implement the narrative chemical constituent <br /> objective. Results of effluent monitoring indicate concentrations of arsenic in the final effluent are <br /> below this existing limitation. Therefore,the existing monthly average effluent limitation of <br /> 10 µg/L(ppb) for arsenic is retained in this new Order. <br /> Total Dissolved Solids <br /> Previous Order No. 93-221 included a daily maximum and monthly average effluent limitation of <br /> 1000 mg/L(ppm) for Total Dissolved Solids (TDS). Concentrations of Total Dissolved Solids <br /> (TDS) in extracted groundwater range from 330 to 860 mg/L(ppm). As a result of the treatment <br /> process, final effluent concentrations of TDS at Outfall 001 have been reported as high as <br /> 976 mg/L(ppm) (10/15/01). For Chemical Constituents at page 1II-3.00, the Basin Plan states `At <br /> a minimum, water designated for use as domestic or municipal supply (MUN)shall not contain <br /> concentrations of chemical constituents in excess of the maximum contaminant levels (MCLS) <br /> specified in the following provisions of Title 22 of the California Code of Regulations...' As a <br /> result, and considering the fact that the Stockton Diverting Canal provides little or no dilution, this <br /> Order includes a new 500 mg/L(ppm) monthly average effluent limitation for TDS applied at the <br /> point of discharge which is necessary to comply with the secondary California MCLs contained in <br /> Title 22, California Code of Regulations (CCR) and incorporated as chemical constituent water <br /> quality objectives in the Basin Plan. This Order retains the average monthly limitation for TDS of <br />