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; <br /> STATE OF CALIFORNIA <br /> STATE WATER RESOURCES CONTROL BOARD <br /> ORDER WQO 2003 - 0002 <br /> In the Matter of the Petition of <br /> CITY OF STOCKTON <br /> For Review of Waste Discharge Requirements <br /> Order No. R5-2002-0083 (NPDES No. CA0079183)and Cease and Desist Order <br /> No. R5-2002-0084 for Stockton Regional Wastewater Control Facility <br /> Issued by the <br /> California Regional Water Quality Control Board, <br /> Central Valley Region <br /> SWRCB/OCC F1LEA-1483 <br /> BY THE BOARD: <br /> In this order, the State Water Resources Control Board (State Board or Board) <br /> remands in part Waste Discharge Requirements Order No. R5-2002-0083 (WDRs), setting forth <br /> waste discharge requirements for the City of Stockton's Regional Wastewater Control Facility, to <br /> the Central Valley Regional Water Quality Control Board (Regional Board) to reevaluate the <br /> effluent limitations for chloroform and dichloromethane, and to clarify the effluent limitations for <br /> diazinon. <br /> I. BACKGROUND <br /> The City of Stockton (Petitioner) seeks review of the WDRs, and the related <br /> Cease and Desist Order No. R5-2002-0084 (CDO), issued by the Regional Board on April 26, <br /> 2002,with respect to its Regional Wastewater Control Facility(RWCF) in San Joaquin County. <br /> The petition was timely filed on May 28, 2002, and includes voluminous challenges to most <br /> portions of the WDRs and CDO, primarily stemming from the Regional Board's decision to deny <br /> dilution credits and a mixing zone for most constituents, including ammonia.' This Order is <br /> ' The Regional Board granted 10:1 dilution credits for chloroform and dichloromethane, and 9.8:1 for <br /> trichloroethene. <br />