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WASTE DISCHARGE REQUIREMENTS CITY OF TRACY WASTEWATER TREATMENT PLANT SAN JOAQUIN COUNTY -8- 8. The short-term flow characteristics of Old River are poorly understood in the vicinity of the discharge, and the overall flow conditions may change several times during a reporting period as a result of the various State Water Project pumping scenarios, tidal activities.future Old River barrier installation projects or the combination of any three. The Discharger is required in Monitoring and Reporting Program No. 96--to continuously monitor the flow characteristics of Old River. In order for the Discharger to establish a monitoring system capable of making flow characteristic determinations,the Discharger shall comply with the following time schedule: Task Compliance Date Submit Flow Characteristic Monitoring Scheme 15 April 1996 Begin Construction of Continuos Monitoring Station(s) 15 June 1996 Achieve Full Continuous Monitoring 15 Sep 1996 By 1 January 1998, the Discharger shall submit a technical report assessing the dilution of the wastewater under worst case flow conditions and evaluate the impacts of the discharge under these conditions. Water quality factors for evaluation include,but are not limited to, potential health impacts of pathogens on recreationists, dissolved oxygen, temperature, and effluent toxicity. 9. If the flow characteristics in Old River are found to be significantly different in Old River than what was used or assumed for developing the effluent limits, then this permit may be reopened for modification or addition of effluent limits and requirements. 10. The Control Mechanism (Pretreatment Ordinance and Local Limits)for Industrial Users shall be updated and approved by the City Council by 15 February 1996. The updated control mechanism shall be implemented immediately upon its approval for new Industrial Users (IUs) and by the control mechanism renewal date for existing IUs. 11. The Discharger shall submit annually a report to EPA and the Board describing their pretreatment activities over the previous 12 months. In the event that the Discharger is not in compliance with any conditions or requirements of this permit,the Discharger shall include the reasons for noncompliance and state how and when the Discharger shall comply with such conditions and requirements. This annual report is due on 31 January of each year and shall contain, but not be limited to, the items listed in Section G. of the Standard Provisions and Reporting Requirements (NPDES). 12. The Discharger shall comply with the attached Monitoring and Reporting Program No. 96- 13. This Order expires on_and the Discharger must file a Report of Waste Discharge in accordance with Title 23,California Code of Regulations, not later than 180 days in advance of such date as application for issuance of new waste discharge requirements. 14. In the event of any change in control or ownership of land or waste discharge facilities presently owned or controlled by the Discharger, the Discharger shall notify the succeeding owner or operator of the existence of this Order by letter, a copy of which shall be immediately forwarded to this office.