FIELD DOCUMENTS AND WORK PLANS 1992-1999

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WASTE DISCHARGE REQUIREMENTS _5 MARLEY COOLING TOWER COMPANY SAN JOAQUIN COUNTY were proposed to prevent future violations. Due to the complexity of the treatment plant it is critical that operations be maintained by adequately trained personnel . 21. The Environmental Protection Agency (EPA) and the Board have classified this discharge as a minor discharge. 22. The beneficial uses of the Calaveras River, Upper Mormon Slough, and the Stockton Diverting Canal are municipal and domestic, industrial , and agricultural supply; recreation; aesthetic enjoyment; navigation; ground water recharge, fresh water replenishment; and preservation and enhancement of fish, wildlife and other aquatic resources. 23. The beneficial uses of the underlying ground water are municipal and domestic, industrial , and agricultural supply. 24. The aquatic standard of 11 µ/1 for hexavalent chromium represents the most significant limitation to operation of the water treatment plant. Water which contains hexavalent chromium exceeding specific set points for in- line meters within the treatment plant will prompt automatic shut down or recycle modes. The system design requires optimum performance to achieve this effluent limit. Bench tests have indicated that the electrochemical process is effective in reducing high concentrations of chromium to meet the 11 µg/l chromium effluent limit only after filtration of the effluent. The bench tests also indicated that the TDS concentrations of the electrochemically treated ground water should be the same as the influent or lower. Arsenic in the ground water taken from the intermediate wells is virtually nonexistent and copper has rarely been measured at concentrations exceeding 6.5 ug/l . 25. On 11 April the State Water Resources Control Board adopted the California Inland Surface Water Plan (Plan) . These requirements are consistent with that Plan. 26. The Board has considered antidegradation pursuant to 40 CFR 131. 12 and State Water Resources Control Board Resolution 68-16 and finds that the permitted discharge is consistent with those provisions. This Order provides for an increase in the volume and mass of pollutants discharged. There is no evidence to indicate that the increase will cause significant impacts on aquatic life, which is the beneficial use most likely affected by the pollutants discharged. The increase in the discharge allows maximum benefit to the people of California by facilitating cleanup of contaminated ground water. 27. The Board adopted a Water Quality Control Plan, Second Edition, for the Sacramento-San Joaquin Delta Basin (hereafter Basin Plan) which contains water quality objectives for all waters of the Basin. These requirements implement the Basin Plan.