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Pete Wilson AUGNEW 1 3 1991 Governor Cal/EPA :alifotttia :nvirownental Mr. Stephen Chen k8 envy Deputy Public Works Director City of Stockton ntegrated 425 N. El Dorado Street caste Stockton, California 95202 Janagement 3oard SUBJECT: Alternative Daily Cover(ADC)Using Processed Green Material at 800 Cal Center Drive the Austin Road Landfill(39-AA-0001)and French Camp Landfill Sacramento, CA 95826 (39-AA-0002) 916)255-2200 Dear Mr. Chen: California Integrated Waste Management Board(CIWMB) staff have reviewed the City of Stockton's (City)ADC Demonstration Project Final Report, dated June 1997, and revisions received by Board staff on July 17, 1997, for the subject facilities. The final report concludes that processed green material can function as suitable daily cover at the facilities and was shown to be suitable for continued use as an ADC. As the enforcement agency, CIWMB staff conducted weekly and periodic inspections during the demonstration project. Based on the monitoring results, CIWMB staff concurs with the City's determination that processed green material (and geosynthetic blankets used as a back-up ADC at the Austin Road Landfill) can meet the functional criteria of earthen cover material. Although problems did occur during the demonstration project, the City was responsive in making improvements to maintain compliance with daily cover requirements. The improvements are reflected in the final report. Please continue to ensure that the use of ADC at the facilities is in compliance with Title 27, California Code of Regulations, section 20680 and that the ADC operations reflect activities successfully tested. The City has requested the ongoing nonexperimental use of ADC at both facilities. CIWMB staff reviewed the respective Solid Waste Facility Permits (SWFP) in conjunction with the final report/Report of Disposal Site Information (RDSI) amendment to detennine what, if any, SWFP action is required to reflect the ongoing use of ADC. After reviewing the RDSI amendment and governing SWFPs, the following determinations have been made to reflect the ongoing nonexperimental use of ADC at the respective facility: