Revision of the operating permit for the landfill at the University of California, Davis, and expansion of the site to meet future campus needs are the focus of a Draft Environmental Impact Report just released for public review. A public hearing to receive comments on the document is scheduled for 7 p.m. Wednesday, Aug. 31, at the Buehler Alumni and Visitors Center on campus. Written comments should be submitted to the UC Davis Planning and Budget Office by 5 p.m. Monday, Sept. 26. Copies may be viewed at the reserve desk for Shields Library on campus, the Yolo County Library in Davis, and the campus Planning and Budget Office on the third floor of Mrak Hall. The 23-year-old landfill occupies 23 acres of campus property northwest of the point where County Road 98 crosses Putah Creek. Acceptable wastes at the landfill are limited to sanitary wastes -- similar to those generated by households -- as well as non-medical animal wastes, sterilized medical wastes and treated laboratory wastes. Radioactive, biohazardous and chemical wastes are not allowed in the landfill. Instead, they are required to be collected separately and disposed of according to state and federal regulations. The proposed activities covered by the Draft EIR include continued operation of the present landfill, expansion of the landfill for additional wastes and for waste-handling facilities, and designation of a recycling area. In addition, the document outlines steps the campus will take to address soil and groundwater contamination beneath and immediately adjacent to the present landfill, as well as gas generated from the chemical breakdown of the materials in the landfill. While the source of the contamination is unclear, most of the organic compounds detected are typical byproducts of the breakdown of refuse in landfills. The expanded landfill is expected to add approximately 16 acres of fill space and 14 acres of facilities' space to the site. The new landfill's state-of-the-art design will incorporate a lining that should prevent any leaking, according to campus environmental planner Sid England. Although the campus operates recycling programs and encourages increased recycling practices by members of the campus community through education programs, additional landfill space is still needed, according to campus planners. Plans developed by the campus, in cooperation with the county, aim to reduce the amount of landfill waste by at least 25 percent by 1995 and 50 percent by the year 2000.