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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION . ORDER NO. 94-_ WASTE DISCHARGE REQUIREMENTS FOR DEFENSE LOGISTICS AGENCY DEFENSE DISTRIBUTION REGION WEST TRACY OPERABLE UNIT 1 GROUND WATER TREATMENT SYSTEM SAN JOAQUIN COUNTY n I I The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board) finds that: I. The Defense Logistics Agency (DLA), Department of Defense (hereafter, Discharger), the owner and operator of Defense Distribution Region West (DDRW) Tracy submitted a Report of Waste Discharge (RWD), dated 15 May 1993. Since the submittal of the RWD, changes have been made to the proposed groundwater extraction and treatment system expansion. 2. DDRW's primary mission is the receipt, storage, and issue of Defense Logistics Agency //\\ supplies. 3. DDRW occupies 448 acres of land 1-1/2 miles southeast of Tracy. The surrounding area is used mainly for agriculture. The Discharger's ground water cleanup system is in the northwest 1/4 of Section 35, T2S, RSE, MDB&M, as shown in Attachment A, incorporated herein and made part of this Order. The Assessor's Parcel Numbers for this site are 250-837-158 and 250-890-102. 4 Waste Discharge Order No. 90-275, adopted by the Board on 28 September 1990 prescribes n requirements for DDRW Tracy, which owns and operates a ground water extraction and V treatment system with disposal to shallow aquifers utilizing injection wells and the existing storm water evaporation/percolation pond. The current treatment and disposal systems are all on-site. The Discharger has expanded the ground water extraction, treatment and disposal system from a capacity of 250 gpm to approximately 450 gpm. New injection wells and infiltration galleries have been constructed to increase the disposal capacity of the system to match the treatment system capacity. The work on thi's phase of expansion was completed at the end of 1994. 5. The ground water treatment system expansion also includes construction of a new separate ground water treatment plant (air stripper), disposal facilities, and new ground water extraction wells on the Annex Property, northeast of the main plant, as shown on ~ Attachment A, incorporated herein and made part of this Order. The full scale capacity of the two extraction and treatment systems combined will be approximately 1250 gpm.