Laserfiche WebLink
`-, Department of Toxic Substances Control <br /> v <br /> Terry Tamminen 8800 Cal Center Drive Arnold Schwarzenegger <br /> Agency Secretary Sacramento, California 95826-3200 Governor <br /> Cal/EPA <br /> September 23, 2004 <br /> SEP 2 7 2004 <br /> ENViRUiviV(EN1 HLAL[H <br /> Mr. Marshall Cloud PERM r/SER'VICES <br /> Defense Logistics Agency <br /> Defense Distribution Depot San Joaquin, Sharpe Site <br /> Post Office Box 960001 <br /> Stockton, California 95296-0250 <br /> CONCURRENCE ON OPERABLE UNIT-1 (OU-1) GROUND WATER FOR DEFENSE <br /> DISTRIBUTION DEPOT SAN JOAQUIN (DDJC), SHARPE SITE, LATHROP, <br /> CALIFORNIA <br /> Dear Mr. Cloud: <br /> The Department of Toxic Substances Control (DTSC) concludes that DDJC-Sharpe's <br /> OU-1 ground water (GW) treatment system is operating properly and successfully. <br /> Data provided in both the Fourth Quarter 2003 and First Quarter 2004 GW Monitoring <br /> Reports show that the OU-1 GW treatment system has attained complete capture of the <br /> contaminant plumes, satisfying the remedial action objectives of the 1993 OU-1 Record <br /> of Decision (ROD). The system consists of 45 extraction wells coupled with three GW <br /> treatment plants equipped with air stripping towers to remove volatile organic <br /> compounds from the extracted aquifer. The majority of the treated effluent is used by <br /> the EI Paso Energy cogeneration plant with the excess treated effluent being <br /> discharged to the South San Joaquin County Irrigation District canal, regulated by a <br /> National Pollutant Discharge Elimination System permit issued by the Regional Water <br /> Quality Control Board. <br /> Although DTSC agrees that the treatment system has captured the ground water <br /> contaminant plume, DTSC cannot certify the response action has been completed. <br /> Title 22 CCR section 67391.1 (c) states that DTSC cannot certify a response which <br /> depends on long-term operations and maintenance without land use restrictions, which <br /> ensure the control technologies and monitoring systems are properly maintained and <br /> operated, and that land use is restricted to prevent exposure. DTSC recommends that <br /> an Explanation of Significant Differences be developed in order to implement <br /> institutional controls for the ground water. <br /> 0 Printed on Recycled Paper <br />