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WASTE DISCHARGE REQUI•MENTS ORDER NO. R5-2004-002iA -48- CITY OF MANTECA, CITY OF LATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY 2. Maintenance activities that can be implemented to address the cause of the overflow and means to prevent future overflows. Maintenance activities may include pretreatment of wastewater from industrial dischargers who discharge high concentrations of oil and grease in their wastewater; 3. Procedures for responding to sanitary sewer overflows designed to minimize the volume of sewer overflow that enters surface waters, and minimize the adverse effects of sewer overflows on water quality and beneficial uses; 4. Steps to be taken when an overflow or spill occurs, and procedures that will be implemented to ensure that all overflows and spills are properly identified, responded to and reported; and 5. A public notification plan, in which any posting of areas contaminated with sewage is performed at the direction of the Sacramento County Health Department. All parties with a reasonable potential for exposure to an overflow event shall be notified. 10. The land leased from Dutra Farms may become unavailable for land disposal over the term of this Order. The Discharger shall provide a technical report by 1 August 2004 that assesses the land disposal capacity of City-owned land covered by this Order,to agronomically apply food processing wastewater,biosolids, and a portion of the municipal wastewater in compliance with this Order. If the Discharger cannot demonstrate that adequate capacity is available for, at a minimum, all food processing wastewater and all biosolids,then the report shall include plans and a'time schedule to provide adequate capacity or determine an alternative disposal solution(e.g. landfill disposal of biosolids) in the event the lease is terminated. 11. The Discharger shall conduct the three species chronic toxicity testing as specified in the Monitoring and Reporting Program. If the testing indicates that the discharge causes, has the reasonable potential to cause, or contributes to an in-stream excursion above the water quality objective for toxicity, the Discharger shall initiate a Toxicity Identification Evaluation(TIE)to identify the causes of toxicity. Upon completion of the TIE, the Discharger shall submit a workplan to conduct a Toxicity Reduction Evaluation(TRE) and, after Regional Board evaluation, conduct the TRE. This Order will be reopened and a chronic toxicity limitation included and/or a limitation for the specific toxicant identified in the TRE included. Additionally, if a chronic toxicity water quality objective is adopted by the State Board, this Order may be reopened and a limitation based on that objective included. 12. The treatment facilities shall be designed,constructed, operated, and maintained to prevent inundation or washout due to floods with a 100-year return frequency.