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U. Project Description Pacific Energy (PEn)currently operates a methane gas recovery system at the landfill to power an electrical generation plant located at the northwest comer of the landfill.'Enough landfill gas is collected to produce 760 kilowatts per hour of electrical power. This energy is sold to Pacific Gas and Electric Company (PG&E). Pacific Energy is responsible for its liquid condensate and returns it to the landfill. On June 3, 1992 the Local Enforcement Agency,the San Joaquin County Public Health Services,through the authority of the landfill's Solid Waste Facility Permit,ordered the City to stop returning condensate to the landfill by October 9, 1993. An alternative disposal method is under review. The existing landfill does not have a liner nor is there any other form of landfill gas collection other than that done by PEn. There have been no significant odor complaints according to City personnel (R.W.Beck,and Associates, 1992). California Integrated Waste Management Board staff have taken combustible gas readings at the property boundary and have found the readings to be below five percent for at least two years. EPA's "Proposed Standards of Performance and Guidelines for Control of Emissions at New and Existing Municipal Landfills"(56 FR 24468;May 30, 1991)require the periodic calculation of the annual nonmethane organic compound(NMOC)emission rate at each affected or designated facility with a maximum design capacity of 100,000 megagrams(Mg)(110,000 tons)or more. At each facility where the calculated emission rate is equal to or exceeds 150Mg/yr(167 tpy)of NMOCs,the installation of a well designed gas collection system is required. It appears that Austin Road Landfill falls within the requirements of these proposed guidelines(R.W.Beck and Associates,1993). The project's landfill gas control system,in addition to the existing power plant,would include a series of gas extraction wells and connectors,a gas condensate collection system,and a gas blower/flare. The blower/flare would be located adjacent to the PEn power plant,where landfill gas would be burned. Condensate sumps would be used to convey condensate to the leachate pretreatment system. Alternatively,PEn could expand its contract with PG&E to generate more electricity,therefore collecting more landfill gas. The specific number and placement of the extraction wells is dependent on themake-up and placement of the solid waste. Therefore,the actual design of the specific components would be completed with the design drawings for construction. 11.17