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WASTE DISCHARGE REQUIREMENTS -6- <br /> CITY OF STOCKTON <br /> REGIONAL WASTEWATER CONTROL FACILITY <br /> SAN JOAQUIN COUNTY LATE REVISIONS <br /> presentation to the US EPA are June 2003 for DO deficiencies, December 2005 for <br /> mercury and organo-phosphate pesticides, and December 2011 for Group A pesticides <br /> and unknown toxicity. The US EPA has not specified a date for the TMDL development <br /> of the dioxin/furan and PCB listed water body. <br /> ANTIDEGRADATION <br /> 20. SWRCB Resolution No. 68-16 (hereafter Resolution 68-16) and 40 Code of Federal <br /> Regulations (CFR) section 131.12 require the Regional Board, in regulating discharge of <br /> waste, to maintain high quality waters of the State until it is demonstrated that any <br /> change in quality will be consistent with maximum benefit to the people of the State, will <br /> not unreasonably affect beneficial uses, and will not result in water quality less than that <br /> described in the Regional Board's policies (e.g., quality that exceeds water quality <br /> objectives). Resolution 68-16 requires the discharge be regulated to meet best practicable <br /> treatment or control to assure that pollution or nuisance will not occur and the highest <br /> water quality consistent with the maximum benefit to the people of the State be <br /> maintained. <br /> 21. With regards to surface water, the receiving water may exceed applicable water quality <br /> objectives for certain constituents as described in this Order. However, this Order and <br /> C&D Order R5-2002-_require the discharger, in accordance with specified <br /> compliance schedules, to meet requirements that will result in the use of best practicable <br /> treatment or control of the discharge and will result in compliance with water quality <br /> objectives, with the exception of dissolved oxygen. This Order also establishes interim <br /> effluent limitations and compliance schedules for pollutants that cannot immediately be <br /> controlled to prevent any additional degradation of surface water by these pollutants. <br /> The total allowable discharge of 55 mgd has not been increased from the previous order <br /> and, therefore, does not cause additional degradation beyond that allowed in the previous <br /> order. The discharge is consistent with Resolution 68-16 and 40 CFR section 131.12 <br /> because this Order requires the discharger to meet requirements that will result in best <br /> practicable treatment or control to assure that pollution or nuisance will not occur. Some <br /> degradation is consistent with maximum benefit to the people of the state because the <br /> discharge allows for economic or social development in the area. <br /> For oxygen demanding substances, the antidegradation analysis cannot be completed <br /> until the TMDL for dissolved oxygen in the SJR is completed and a waste load allocation <br /> has been assigned to the RWCF discharge. However, in the interim. this Order contains <br /> several requirements that will reduce oxygen demanding substances discharged to the <br /> SJR. The proposed permit contains new effluent limitations for ammonia and DO <br /> contains requirements to construct Title 22 tertiary facilities and requires the continuous <br /> operation of the existing tertiary facilities <br /> 22. Witt e.gards to groundwater, domestic wastewater contains constitr r:nt • n is total <br /> ed solids (TDS), specific conductivity, pathogc xitrates, org:i n,;tals and <br /> ygen demanding substances (BOD). The Discharger's unlined oxidation ponds may <br /> result in an increase in the concentration of these constituents in groundwater. Some <br />