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WASTE DISCHARGE REQUqb�IENTS ORDER NO. R5-2004-00280 -45- CITY OF MANTECA, CITY OP'LATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY 5. There are indications that elevated temperatures in the San Joaquin River may affect migrating Chinook salmon and other fish during portions of the year. Temperature objectives in the Basin Plan and the Thermal Plan may not address the temperature parameters necessary to protect migrating fish. To evaluate the effect of a thermal temperature discharge to migrating fish, the Discharger shall conduct a comprehensive study of the effect of its thermal discharge to migrating fish in the vicinity of the discharge (with particular attention being paid to those periods when River flow is lowest and/or River or effluent temperature are highest). The Discharger shall perform the study in consultation with the Department of Fish and Game,United States Environmental Protection Agency, National Marine Fisheries Service, United States Fish and Wildlife Service, and other interested parties. A work plan for this study shall be completed and submitted to the Executive Officer by 1 September 2004. The work plan shall include a schedule for completing all work in accordance with the work plan within eighteen(18) months following work plan approval by the Executive Officer. Also, a progress report shall be submitted every six (6) months after approval of the work plan. The permit may be reopened after review of the study to incorporate Regional Board findings and requirements as appropriate. 6. Pollution Prevention Plan: The Discharger shall prepare a pollution prevention plan following California Water Code 13263.3(d)(3) for mercury. A work plan and time schedule for preparation of the pollution prevention plan shall be completed and submitted to the Executive Officer for approval by 1 August 2004. The Pollution Prevention Plan shall be completed and submitted to the Regional Board by 1 August 2005. A progress report shall be submitted every six (6) months after submittal of the work plan. Based on a review of the submitted information, this Order may be reopened for addition and/or modification of limitations and requirements for these constituents. The Discharger shall submit to the Regional Board, on or before each compliance due date, the specified document or a written report detailing compliance or noncompliance with the specific date and task. If noncompliance is reported, the Discharger shall state the reasons for noncompliance and include an estimate of the date when the Discharger will be in compliance. The Discharger shall notify the Regional Board by letter when it returns to compliance with the time schedule. 7. SIP Study: The discharge may contain dioxins that have a reasonable potential to cause or contribute to an exceedance of water quality objectives. The Discharger shall comply with the following time schedule in conducting a study of these constituents potential effect in surface waters: Task Compliance Date Submit Study Report for Dioxins 1 November 2004