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WASTE DISCHARGE REQUIREMENTS -6- CITY OF STOCKTON MAIN WATER QUALITY CONTROL PLANT SAN JOAQUIN COUNTY 9. The Discharger either individually or in combination with other discharges shall not create a zone, defined by water temperatures or more than on Fahrenheit degree above natural receiving water tempera- ture, which exceeds 25 percent of the cross-sectional area of the main river channel at anytime or place. 10. The discharge shall not cause a surface water temperature rise greater than 4 Fahrenheit degrees above the natural temperature of the receiving waters at any point. 11 The discharge shall not cause a violation of any applicable water quality standard for receiving waters adopted by the Board or the State Water Resources Control Board as required by the Federal Water Pollution Control Act and regulations adopted thereunder. If more stringent applicable water quality standards are approved pursuant to Section 303 of the Federal Water Pollution Control Act, or amendments thereto, the Board will revise and modify this order in accordance with such more stringent standards. 12. The discharge shall contain no detectable levels of pentachlorophenol . C. Provisions: 1. Neither the discharge nor its treatment shall create a nuisance or pollution as defined in Section 13050 of the California Water Code. 2. If future studies indicate that additional nitrogen removal is necessary to protect water quality, the Board may revise and modify this Order to include more stringent nitrogen limitations. 3. The City of Stockton Main Water Quality Control Plant, shall dili- gently pursue and enforce source control of Total Dissolved Solids (TDS) to minimize the level of TDS discharged and shall furnish a report no later than 15 February of each year describing the major sources of TDS and control measures which were taken during the previous year. 4. The requirements prescribed by this Order rescind Order No. 79-152, which is hereby rescinded. 5. The Discharger shall comply with all the items of the "Standard Provisions and Reporting Requirements (NPDES)", dated 1 August 1984, which are part of this Order. 9. The Discharger may be required to submit technical or monitoring reports as directed by the Executive Officer.