SITE INFORMATION AND CORRESPONDENCE_1993-2003

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INFORMATION SHEET THE DEPARTMENT OF DEFENSE, DEFENSE LOGISTICS AGENCY DEFENSE DISTRIBUTION REGION WEST, SHARPE LOCATION INTERIM GROUND WATER CLEANUP SYSTEM SAN JOAQUIN COUNTY The Defense Distribution Region West(DDRW Sharpe), Sharpe facility, has the primary objective of handling logistics and supplies for the Department of Defense. The facility is approximately seven miles south of the City of Stockton, in the community of Lathrop,just east of Interstate 5 freeway. Past practices at the facility have contributed to ground water contamination. The ground water beneath and adjacent to the site is contaminated with volatile organic compounds, a pesticide, and heavy metals. The facility began addressing ground water cleanup in the mid-1980s and has already installed two ground water extraction and treatment systems. A third system near the center of the facility began operation in May 1995. The Interim Ground Water Cleanup Systems consist of banks of extraction wells and air stripping towers. The system typically removes volatile organic compounds to concentrations below 0.5 µg/1. The treated wastewater from both ground water treatment plants is then commingled and provided to a cogeneration plant that uses a portion of the flow. Any wastewater not used by the cogeneration plant is discharged to the South San Joaquin Irrigation District canal which flows to French Camp Slough. The effluent limits apply to the commingled wastewater being discharged from the Sharpe facility. DDRW Sharpe proposes to discharge approximately 1.15 mgd of wastewater to the canal. The proposed permit requires toxicity testing of the canal and extensive testing for constituents to ensure that no conditions of toxicity develop. Specifically, Aluminum, Antimony, Arsenic, Beryllium, Bromacil, Cadmium, Copper, Silver, Thallium, Vanadium, and Zinc have been identified as constituents that require further study because the current discharge may raise the recieving water concentrations above acceptable toxicity standards. The proposed Order requires the Discharger to study the effluent and receiving water characteristics with respect to these constituents of concern. A time schedule has been included for completion of the study and a corrective action program as necessary. The permit can be reopened to add or delete effluent limitations based on the findings of the above study. Surface water drainage is to the canal which is tributary to French Camp Slough. Stormwater discharges are regulated as a part of the NPDES Permit Order No. 92-184 which also regulates the discharge of the domestic wastewater treatment plant at the Sharpe Facility. PAM:Idj