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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2004-0028 -47- WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2004-0028 -48- CITY OF MANTECA,CITY OF LATHROP AND DUTRA FARMS CITY OF MANTECA,CITY OF LATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY SAN JOAQUIN COUNTY sanitary sewer overflows,or whenever there is a sanitary sewer overflow. The Discharger shall ensure that the up-to-date SSS Plan is readily available to sewer system personnel at 2. Maintenance activities that can be implemented to address the cause of the all times and that sewer system personnel are familiar with it. A general order to regulate overflow and means to prevent future overflows. Maintenance activities may collection systems may be developed by the Regional Board. If a general order for include pretreatment of wastewater from industrial dischargers who discharge collection systems is adopted by the Regional Board,the Discharger will be required to high concentrations of oil and grease in their wastewater; seek coverage under the general order. Once the Discharger has obtained a general order for the collection system,this permit may be reopened and these requirements may be 3. Procedures for responding to sanitary sewer overflows designed to minimize the removed from this permit. volume of sewer overflow that enters surface waters,and minimize the adverse effects of sewer overflows on water quality and beneficial uses; a. At a minimum,the Operation and Maintenance portion of the plan shall contain or describe the following: 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, 1. Detailed maps of the sanitary sewer system,identifying sewer mains,manholes, responded to and reported;and and lift stations; 5. A public notification plan,in which any posting of areas contaminated with 2. A detailed listing of elements to be inspected,a description of inspection sewage is performed at the direction of the Sacramento County Health procedures and inspection frequency,and sample inspection forms; Department. All parties with a reasonable potential for exposure to an overflow event shall be notified. 3. A schedule for routine inspection and testing of all pipelines,lift stations,valves, and other key system components. The inspection/testing program shall be 10. The land leased from Dutra Farms may become unavailable for land disposal over the term designed to reveal problems that might lead to accidental spills and ensure that of this Order. The Discharger shall provide a technical report by 1 August 2004 that preventive maintenance is completed; 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 4. Provisions for repair or replacement of old,worn out,or defective equipment; 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 5. Provisions to minimize the need for manual operation of critical systems and biosolids,then the report shall include plans and a time schedule to provide adequate provide spill alarms or other"fail safe"mechanisms; capacity or determine an alternative disposal solution(e.g.landfill disposal of biosolids)in the event the lease is terminated. 6. The ability to properly manage,operate and maintain,at all times,all parts of the collection system that the Discharger owns or over which the Discharger has 11. The Discharger shall conduct the three species chronic toxicity testing as specified in the operational control; 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 7. The ability to provide adequate capacity to convey base flows and peak flows for quality objective for toxicity,the Discharger shall initiate a Toxicity Identification all parts of the collection system the Discharger owns or over which the Evaluation(TIE)to identify the causes of toxicity. Upon completion of the TIE,the Discharger has operational control;and 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 8. How the Discharger will take all feasible steps to stop and mitigate the impact of chronic toxicity limitation included and/or a limitation for the specific toxicant identified sanitary sewer overflows in portions of the collection system the Discharger owns in the TRE included. Additionally,if a chronic toxicity water quality objective is adopted or over which the Discharger has operational control. by the State Board,this Order may be reopened and a limitation based on that objective included. b. At a minimum,the Overflow Prevention and Response Plan shall contain or describe the following: 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. 1. Identification of areas of the collection system that historically have overflowed and an evaluation of the cause of the overflow;