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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> ORDER N0. <br /> WASTE DISCHARGE REQUIREMENTS <br /> FOR <br /> DEFENSE DEPOT TRACY'S <br /> INTERIM GROUNDWATER CLEANUP SYSTEM <br /> DEFENSE LOGISTICS AGENCY, DEPARTMENT OF DEFENSE <br /> AND ENSOTECH INC. <br /> SAN JOAQUIN COUNTY <br /> The California Regional Water Quality Control Board, Central Valley Region, <br /> (hereafter Board) finds that: <br /> 1. The Defense Logistics Agency, Department of Defense, the owner and <br /> operator of the Defense Depot Tracy (DDT) , and Ensotech Inc. , the <br /> contractual operator of the DDT' s interim groundwater cleanup system, <br /> jointly submitted a Report of Waste Discharge, dated 21 November 1989. <br /> Hereafter both the Defense Logistics Agency and Ensotech Inc. are <br /> referred to as the Discharger. <br /> 2. DDT's primary mission is the receipt, storage, and issue of Defense <br /> Logistics Agency supplies. <br /> 3. DDT occupies 448 acres of land 1-1/2 miles southeast of Tracy. The ` <br /> surrounding area is used mainly for agriculture. The Discharger' s <br /> interim groundwater system is in the northwest 1/4 of Section 35, T2S, <br /> R5E, MDB&M, as shown in Attachment A, incorporated herein and made part _ <br /> of this Order. The Assessor's Parcel Numbers for this site are 250- <br /> 837-158 and 250-890-102. <br /> 4. The Discharger is proposing to discharge treated grou dwater to shallow <br /> aquifers utilizing injection wells and the existing stDrm drain holding <br /> pond, all located onsite. Groundwater recharge was determined to be <br /> the most desirable disposal alternative since it would minimize <br /> groundwater depletion. <br /> L <br /> 5. The Defense Logistics Agency is conducting RI/FS activities at DDT in <br /> accordance with CERCLA. Groundwater contamination, specifically <br /> trichloroethene (TCE) and tetrachloroethene (PCE) up to 560 ppb and 340 <br /> ppb respectively, has been detected. Other contaminants have been <br /> detected, though infrequently and/or at levels substantially below <br /> drinking water standards. These include 1 , 1-dichloroethane, 1 ,2- <br /> dichloroethene , 1 , 1-dichloroethene , 1 , 2-d chloroethene , <br /> tetrachloroethane, acetone, chromium, selenium, to iuene, benzene, <br /> ethylbenzene, xylene, total petroleum hydrocarbons, a,id dieldrin. <br /> 6. The sampling and analysis of RI/FS monitoring wells has been sporadic; <br /> however, the Discharger is currently developing a regimented monitoring <br /> well sampling and analysis program that will more definitively <br /> characterize the groundwater pollution and identify seasonal <br /> fluctuations. Effluent limitations are established for presently known <br />