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WASTE DISCHARGE REQUIREMENTS FOR -3- CITY OF STOCKTON AUSTIN ROAD LANDFILL FACILITY CLASS III LANDFILL SAN JOAQUIN COUNTY 19. A Solid Waste Assessment Test And Verification Monitoring Plan, dated June 1989, was submitted for the landfill . The report showed that there had been a significant water quality impact at the down gradient ground water monitoring wells MW-1 and MW-4. Volatile organic compounds (VOC's) were found in the downgradient wells, and were confirmed with further sampling. Supplemental sampling results indicated that VOC's were detected in California Youth Authority (CYA) wells CYA-1 and CYA-2 at levels equal to or slightly above action levels, and in a private well at 8106A Austin Road. However, confirmation sampling results did not detect any VOC's at either of the CYA wells. Further sampling at the private well at 8106A Austin Road did detect VOC's. 20. Because of the detection of VOC's downgradient of the landfill , an evaluation monitoring program was implemented to determine the vertical and horizontal extent of contamination. The initial investigation consists of sampling the water in the first two sand zones in eight borings along the downgradient edge of the landfill and along the upgradient edge of the landfill . The upgradient sampling will be performed to determine if VOC' s are migrating towards the landfill from Forward Landfill . Further investigation consists of off-site exploration and determination of the horizontal extent of the problem. The extent of the off-site exploration depends on the results of the initial investigation. 21. The initial investigation for the evaluation monitoring program has been completed. The results of the eight borings along the downgradient edge of the landfill showed that the water quality in the upper two water zones has been impacted. It was determined that the two zones are interconnected, or essentially one continuous zone. Further evaluation will include an investigation of the third water zone to determine if it has also been impacted. A time schedule for the completion of the evaluation monitoring program and implementation of a corrective action program is included in Provision C.17. CEQA CONSIDERATIONS AND OTHER LEGAL REFERENCES 22. The action to revise the waste discharge requirements (WDRs) for this landfill is exempt from the provisions of the California Environmental Quality Act (Public Resources Code Section 21000, et seq. ) , in accordance with Title 14, CCR, Section 15301. 23. The Board has adopted a Water Quality Control Plan, 2nd Edition, for the Sacramento River, Sacramento-San Joaquin Delta, and San Joaquin River Basins (5A, 5B, 501. This Order implements the water quality objectives stated in that Plan. Furthermore, this Order implements the prescriptive standards and performance goals of Subchapter 15, effective 27 November 1984. 24. The Board has notified the Discharger and interested agencies and persons of its intention to revise the WDRs for this facility. 25. In a public hearing, the Board heard and considered all comments pertaining t-o this facility and discharge.