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II. Project Description On October 9, 1991,the United States Environmental Protection Agency(EPA)released new regulations for landfills and landfill extensions. These new regulations are found in 40 Code of Federal Regulation,Part 258, and are intended to implement parts of Subtitle D of the Resource and Conservation Recovery Act(RCRA). The new regulations require all new landfills and extensions of existing landfills to have a composite liner system consisting of two feet of clay with a permeability of less than 10-7 centimeters per second and a synthetic liner at least 60 thousandths of an inch thick(60 mil). SLUDGE TREATMENT The City of Stockton Municipal Utility District(District) stockpiled approximately 20,000 to 25,000 cubic yards of digested sewage sludge at the Austin Road Landfill. The Regional Water Quality Control Board has permitted the landfill operators to use this material as the foundation for the final cover if the necessary compaction could be achieved. DPW was concerned that this compaction requirement might be difficult to achieve, and therefore has decided to stop accepting sludge and asked the District to remove the stockpile at the landfill. This task will be performed prior to closure of the existing landfill. Removal of this material is not a part of this project and therefore will not be analyzed in this EIR. No sludge treatment facility is included in the conceptual design for the Austin Road Landfill expansion. The District is currently managing its sewage sludge by hauling it to an agricultural user in Merced County. The District is currently developing its long-term sludge management plans, which may include composting and co-composting. The facility for this procedure is anticipated to be sited adjacent to the wastewater treatment plant. The composted material could be utilized in agriculture,for daily cover at the landfill,or as a soil amendment to aid in revegetation of the final cover at the landfill. It is possible that both the District and the DPW may wish to site the composting and co- composting facility at the Austin Road Landfill in the future. Therefore,in the conceptual site layout,approximately 13 acres are delineated for future composting and/or co-composting operations. This facility could include receiving and short term storage areas, a greenwaste sorting area,a mixing area,windrow composting and curing areas,storage and loading areas for the composted material, and an equipment area. The anticipated quantity of sludge and greenwaste,in 2010,is approximately.30,000 tons per year and approximately 28,000 tons per year,respectively(R.W. Beck and Associates, 1992). Any future composting and/or co- composting operations would require separate environmental review. II.6