SITE INFORMATION AND CORRESPONDENCE_1993-2003

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• • INFORMATION SHEET 18 WASTE DISCHARGE REQUIRMENTS ORDER NO.R5-2002-XXXX U.S.DEPARTMENT OF DEFENSE DEFENSE LOGISTICS AGENCY DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN SHARPE GROUNDWATER REMEDIATION SYSTEM SAN JOAQUIN COUNTY x 1.152 mgd x 365 =0.042 lbs/yr). Upon completion of the Interim Mercury Mass Limitation Study required by this Order, this Order shall be reopened and an interim performance based mercury mass effluent limitation established. Final effluent limitations may include: a waste load allocation derived from the TMDL, or a site specific water quality objective. The economic effect of the provisions of this permit on the discharger is nominal. When established, the interim mercury effluent limits require the discharger to simply maintain current plant performance. Selenium Results of effluent monitoring of the three GWTPs indicates the MEC's of total selenium in the final effluent are typically less than the analytical reporting limit of 5 gg/L(ppb). Selenium was detected in the final effluent of the North Balloon GWTP on two ocassions, 2 May 2000 (11µg/L (ppb)), and 5 June 2001 (6.0 µg/L(ppb)). As shown in Attachment C,40 CFR 131.38 includes a CCC criterion for selenium expressed in the total recoverable form. While other criteria for selenium were promulgated for specific waters in California in the NTR, it is the 5 µg/L(ppb) chronic criterion shown in Attachment C which applies to additional waters of the United States in the State of California pursuant to 40 CFR 131.38(c). Since the preservation and enhancement of fish, wildlife, and other aquatic resources and habitats is an existing beneficial use of the SSJID Canal, this criterion applies to the SSJID Canal. The GWTPs operate independently, and the final discharge is a made up of the co-mingled GWTP effluents. While the MEC from the North Balloon GWTP did exceed the selenium criterion, it is unknown if the final effluent concentration would exceed the criterion after mixing with the other GWTP effluent flows. This Order requires the Discharger to collect additional effluent and receiving water data for selenium, and may be re-opened if the data indicate concentrations of selenium are or may be discharged at a level which will cause or have the reasonable potential to cause or contribute to an in-stream excursion above the selenium criterion. Trace Element Water Quality Objectives Specific water quality objectives which apply to surface waters in the Sacramento and San Joaquin River Basins, including the Delta, are provided in Chapter III of the Basin Plan. These objectives are summarized in the below: Constituent Maximum Concentration Arsenic dissolved 10 Barium(dissolved) 100 Cyanide(dissolved) 10 Iron(dissolved) 300 Manganese dissolved 50 Silver(dissolved) 10 Zinc dissolved) 100