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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. 90-122 WASTE DISCHARGE REQUIREMENTS FOR CITY OF STOCKTON AUSTIN ROAD LANDFILL FACILITY CLASS III LANDFILL SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region (hereafter Board) finds that: 1. The City of Stockton (hereafter Discharger) submitted a Solid Waste Assessment Test Report And Verification Monitoring Plan, dated June 1989, a Report of Waste Discharge, dated October 1988; a Solid Waste Assessment Test Proposal , dated July 1988; a Report of Geotechnical Services, dated June 1988; and a Report of Test Borings, dated July 1972. 2. The Solid Waste Assessment Test (SWAT) performed at the site showed a significant ground water quality impact. The landfill is currently regulated by Waste Discharge Requirements Order No. 89-031. Revised Waste Discharge Requirements (WDRs) are needed to set a time schedule for the completion of the verification monitoring and corrective action measures for ground water cleanup. 3. The 180-acre facility is owned and operated by the City of Stockton. Waste disposal activities are currently limited to 135-acres of the facility north of the North Fork of South Little Johns Creek in the northwest 1/4 of Section 3, T1S, R7E, MDB&M, as shown in Attachment "A" , which is incorporated herein and made part of this Order. WASTES AND THEIR CLASSIFICATION 4. The Discharger proposes to continue to discharge municipal solid waste from the City of Stockton for disposal in the Class III Landfill . These wastes are classified as 'nonhazardous solid waste' or ' inert waste' , using the criteria set forth in Title 23, California Code of Regulations (CCR) , Chapter 3, Subchapter 15 (hereafter Subchapter 15) . The discharge rate is approximately 700,000 cubic yards (200,000 tons) per year. 5. Methane gas will continue to be collected and used in a power plant, developed by Pacific Energy in 1986. The power plant produces up to 760 kilowatts per hour of electrical power, which is sold to Pacific Gas & Electric (PG&E) under a long-term agreement. Return condensate is discharged to the landfill via a leach line buried near the upper trash/fill dirt interface of the landfill . The return condensate discharge is regulated under separate WDRs Order No. 88-208. DESCRIPTION OF THE SITE 6. Land within 1000 feet of the facility is used for: agricultural and landfilling activities to the south; the Northern California Youth Center to the north; and the Pacific Energy methane gas recovery system on the east end of the site.