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INFORMATION SHEET g <br /> WASTE DISCHARGE REQUIRMENTS ORDER NO. RS-2002-0213 <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 /> aquatic life. Both conditions may exist within a short time span, where the SSJID Canal would be <br /> dry without the discharge and periods when sufficient background flows provide hydraulic <br /> continuity with French Camp Slough and the Delta. The lack of dilution results in more stringent <br /> effluent limitations to protect recreational uses and aquatic life. Significant dilution may occur <br /> during the irrigation season, and immediately following high rainfall events. <br /> The Discharger may conduct flow monitoring of the SSJID Canal to determine the actual flow <br /> regime. To the extent seasonal assimilative capacity is available in the receiving water to <br /> accommodate constituents in the effluent which exceed reasonable potential criteria, this permit <br /> contains a re-opener to consider final effluent limitations based upon demonstrated assimilative <br /> capacity. However, effluent limitations contained in this permit do not account for the receiving <br /> waters having assimilative capacity. The Discharger may submit additional receiving water <br /> characterization to demonstrate the flow regime and pollutant assimilative capacity and ask the <br /> Regional Board to re-open the permit to consider this new infom7ation. <br /> 303d Listed Constituents <br /> Areas of the Delta have been identified as a Water Quality Limited Segment under section 303(d) <br /> of the CWA. The list of pollutants for which the Delta is impaired appears on a list(the <br /> "California 303(d) List"), which was most recently updated in 1998. Pollutants and/or conditions <br /> identified on the California 303(d) List as impairing Delta Waterways, to which the SSJID Canal <br /> and French Camp Slough are tributary, include mercury, electrical conductivity, low dissolved <br /> oxygen, chlorpyrifos, diazinon,DDT, Group A pesticides (aldrin, dieldrin, endrin, heptachlor, <br /> heptachlor epoxide, chlordane (total), hexachlorocyclohexane (total), endosul£an (total), and <br /> toxaphene), and unknown toxicity. <br /> Additionally,previous studies of chlorpyrifos conducted by Regional Board staff in French Camp <br /> Slough have found chlorpyrifos concentrations as high as 0.520 gg/L (ppb), which is nearly 10 <br /> times the 96-hour Ceriodaphnia LC50 (median lethal concentration). <br /> CTR, NTR, and SIP <br /> USEPA adopted the National Toxics Rule (NTR) on 5 February 1993 and the California Toxics <br /> Rule(CTR) on 18 May 2000. These Rules contain water quality standards applicable to this <br /> discharge. The State Water Resources Control Board (SWRCB) adopted the Policy for <br /> Implementation of Toxics Standards for Inland Surface Waters, Enclosed Bays, and Estuaries of <br /> California (known as the State Implementation Policy or SIP), which establishes requirements for <br /> implementation of the NTR and the CTR. <br /> Federal regulations require effluent limitations for all pollutants that are or may be discharged at a <br /> level that will cause or have the reasonable potential to cause, or contribute to an in-stream <br /> excursion above a narrative or numeric water quality standard. The absence of a limitation for a <br /> constituent indicates either a lack of information is available for evaluation, or the constituent does <br />