SITE INFORMATION AND CORRESPONDENCE

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.� WASTE DISCHARGE REQUIREMENTS -8- CITY OF STOCKTON MAIN WATER QUALITY CONTROL PLANT SAN JOAQUIN COUNTY a. Any new introduction of pollutants into the POTW from an indirect discharger that would be subject to sections 301 or 306 of the Clean Water Act if it were directly discharging those pollutants. b. Any substantial change in the volume or character of pollutants being introduced into that POTW by a source introducing pollu- tants into the POTW at the time of issuance of the permit. Adequate notice shall include information on the quality and quantity of effluent introduced into the POTW as well as any anticipated impact of the change on the quantity or quality of effluent to be discharged from the POTW. 14. By 1 June 1986, an interim technical plan shall be submitted to the Executive Officer which outlines the options available and methods which will be taken in 1986 to dispose of Stockton's sewage sludge in compliance with CAC Title 23, Chapter 3, Subchapter 15. By i January 1986, the final plan shall be submitted which describes handling and disposal methods for the next 20 years. 15. Continuous pH monitoring and continuous residual chlorine monitoring shall be implemented by 1 December 1986. 16. The Discharger will be required to contribute to the cost of purchase, installation, calibration, operation and maintenance of a flow meter which accurately reflects the flow in the San Joaquin River at the point of discharge. 17. An effluent toxicity program shall be implemented by 1 September 1986 which consists of the following tasks: a. During the months of September 1986, December 1986, March 1987, and June 1987 grab samples shall be taken once weekly at the influent to pond #4 for static chronic toxicity tests. These tests shall be conducted using three test species according to EPA 600/4-85-014. The most sensitive of these species will be selected to be the test species for the weekly chronic toxicity tests. b. Continuous flow through toxicity testing on the effluent which is discharged to the San Joaquin River shall be implemented ac- cording to EPA 600/4-85-013. During the time period 1 September 1986 - 31 August 1987 , two test species will be used, with the approval of the Executive Officer. The most sensitive of these species will be selected as the test species. C. Monthly and quarterly results of a and b above shall be reported to the Executive Officer with the monthly monitoring report.