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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2002-0213 • 2 <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 /> Average Total Daily Flow(12/00 to 11/01): 0.913 million gallons per day (mgd) <br /> Average Daily Flow to SSJIDC(12/00 to 11/01): 0.713 mgd <br /> Combined GWTP Design Flow1.9 mgd <br /> Average Temperature: 21.5 °C summer, 20.0°C winter <br /> Previous Order 95-258 included an average daily flow limit of 1.152 mgd. The Discharger <br /> requested an increase in the average daily flow to 1.9 mgd to accommodate all design flows from <br /> all three GWTPs, including the Central Area GWTP. Effluent design flows from the Central <br /> Area GWTP were not previously considered in the daily average flow limitation. <br /> 6. The discharge was previously regulated by Waste Discharge Requirements Order 95-258, <br /> adopted by the Regional Board on 8 December 1995. <br /> 7. The U.S. Environmental Protection Agency(USEPA) and the Regional Board have classified <br /> this discharge as a minor discharge. <br /> 8. The Regional Board adopted a fflater Quality Control Plan, Fourth Edition,for the Sacramento <br /> and San Jobquin River Basins (hereafter Basin Plan). The Basin Plan designates beneficial uses, <br /> establishes water quality objectives, and contains implementation programs and policies to <br /> achieve water quality objectives for all waters of the Basin. These.requirements implement the <br /> Basin Plan. <br /> 9. Treated groundwater is discharged via the facility storm drain to the South San Joaquin <br /> Irrigation District(SSJID) Canal. The SSJID Canal is a constructed agricultural drain, which <br /> collects and receives tailwater and other irrigation return flows, along with stormwater during <br /> rain events. The SSJID Canal runs adjacent to the Western Pacific railroad tracks, and flows <br /> from south to north along the eastern edge of the DDJC-Sharpe facility. Approximately 1.5 <br /> miles north of the DDJC-Sharpe facility, the SSJID Canal empties into French Camp Slough. <br /> At the confluence between the SSJID Canal and French Camp Slough there are no significant <br /> barriers to aquatic organism movement or migration. French Camp Slough subsequently flows <br /> northeast, discharging to the San Joaquin River southwest of Stockton. Absent the discharge of <br /> treated groundwater from the DDJC-Sharpe facility, there are periods of limited or no flow in the <br /> SSJID Canal. <br /> Previous Order No. 95-258 considered French Camp Slough the receiving water for this <br /> discharge. This Order considers the impact of the discharge on the existing beneficial uses of <br /> both the SSJID Canal and French Camp Slough. All of these identified waters are considered <br /> waters of the United States. <br /> 10. The Basin Plan at page H-2.00 states that: "Existing and potential beneficial uses that currently <br /> apply to surface waters of the basins are presented in Figure II-1 and Table U-1. The beneficial <br /> uses of any specifically identified water body generally apply to its tributary streams." The <br /> Basin Plan does not specifically identify beneficial uses for the SKID Canal or French Camp <br /> Slough,but the Basin Plan does identify present and potential uses for the San Joaquin River and <br />