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WASTE DISCHARGE REQUIREEIENTS ORDER NO.R5-2002-0213 23 <br /> U.S.DEPARTMENT OF DEFENSE <br /> DEFENSE LOGISTICS AGENCY <br /> DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN <br /> SHARPE GROUNDWATER REMEDIATION SYSTEM <br /> SAN JOAQUIN COUNTY <br /> 4. Mercury TMDL Reopener: This Order shall be reopened, as necessary, and final effluent <br /> limitations established for mercury based upon a waste load allocation derived from the <br /> Delta waterways TMDL or a site-specific water quality objective. <br /> 5. Arsenic Dilution/Mixing Zone Study: Sufficient information regarding the quality and <br /> quantity of flows in the SSJID Canal and French Camp Slough is not available to <br /> adequately assess the location of drinking water intakes, the fate and transport of arsenic <br /> resulting from the effluent discharge, ambient dilution water, and mixing zone <br /> characteristics needed to assess alternative final effluent limitations for arsenic. Therefore, <br /> within six (6) months of adoption of this Order the Discharger shall complete and submit <br /> an Arsenic Dilution/Mixing Zone Study Workplan. The final Study shall be completed <br /> within thirty six(36) months from the date of adoption of this Order. The Discharger <br /> shall submit semi-annual progress reports on 15 January and 15 July each year until the <br /> Study is completed. Concurrently, the Discharger may provide information to the Regional <br /> Board to support a Basin Plan amendment to de-designate the municipal and domestic <br /> supply(MUN)beneficial use of the SSJID Canal based on the exceptions to SWRCB <br /> Resolution 88-63. Upon completion of the Study, this Order may be reopened to include <br /> alternative final effluent limitations for arsenic. If this Study is not completed, this Order <br /> includes a final monthly average effluent limitation for arsenic of 10 µg/L(ppb) consistent <br /> with the new USEPA primary MCL and effective 23 January 2006. <br /> 6. Chronic Toxicity Testing: The Discharger shall conduct the chronic toxicity testing <br /> specified in the Monitoring and Reporting Program. If the testing indicates that the <br /> discharge causes,has the reasonable potential to cause, or contributes to an in-stream <br /> excursion above the water quality objective for toxicity,the Discharger shall initiate a <br /> Toxicity Identification Evaluation (TIE) to identify the causes of toxicity. Upon <br /> completion of the TIE,the Discharger shall submit a workplan to conduct a Toxicity <br /> Reduction Evaluation (TRE) and, after Regional Board evaluation, conduct the TRE. This <br /> Order will be reopened and a chronic toxicity limitation included and/or a limitation for the <br /> specific toxicant identified in the TRE included. Additionally, if a chronic toxicity water <br /> quality objective is adopted by the SWRCB, this Order may be reopened and a limitation <br /> based on that objective included. <br /> 7. Reopeners: This Order may reopened and effluent and/or receiving water limitations <br /> modified based on information supplied as required above. <br /> 8. The Discharger shall comply with all the items of the"Standard Provisions and Reporting <br /> Requirements for Waste Discharge Requirements (NPDES)", dated 1 March 1991,which <br /> are part of this Order. This attachment and its individual paragraphs are referred to as <br /> "Standard Provisions." <br /> 9. The Discharger shall use the best practicable control to limit mineralization to no more than <br /> a reasonable increment. <br />