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Page 1-29 SEC77ON 1 -LANDFILL EXPANSION ISSUES City personnel have said that there have not been significant complaints about migrating odors. Combustible Gas Indicator readings taken by personnel from the California Integrated Waste Management Board have shown that there have been no compliance problems, i.e., methane gas above five percent at the property boundaries, for at least two years. 1.7.3 Proposed System The contract, dated August 27, 1982, between the City of Stockton and Pacific Energy states that the "term of the lease is for fifteen years and for so long thereafter as landfill gas is produced in Paying Quantities, as the term is defined in the Lease, but in no event shall the term extend beyond fifty (50) years." Pacific Energy will have responsibility for that portion of the landfill gas. However, there is a large portion of the existing landfill and the entire proposed landfill expansion that may require gas control. The EPA issued preliminary rules in the Federal Register (May 30, 1991: Volume 56, Number 104, Pages 24465 - 24528) regarding landfill gas control. Facilities affected by the proposed rules have at least 111,000 tons in place and/or they emit more than 150 megagrarns per year of non-methane organic carbon. This second condition is listed as being approximately equivalent to a landfill receiving 167 tons per year. Therefore, it appears that Austin Road Landfill will need to meet the proposed requirements. The proposed requirements address the methods of collection and treatment. In brief description, the same requirements that are now required on closed facilities will be required on operating facilities. The anticipated date of promulgation of these rules is October 1993. To meet the requirements, an active gas control system would be instituted in the expansion areas. Gas extraction wells with overlapping radii of influence would be used in conjunction with collection laterals and transmission mains to convey the gas to a Blower/Flare facility adjacent to the Pacific Energy power plant,where it would be burned. Condensate sumps would be used to convey condensate to the leachate pretreatment system and there would be monitoring of individual gas extraction wells for gas pressure and oxygen content. Alternatively, Pacific Energy could expand its contract with PG&E so that more landfill gas could be used to generate electrical power. As both the exact make-up and placement of the solid waste is variable, it is not possible at this conceptual stage to define the specific number and placement of the extraction wells that will be needed. Sheet P1 shows nine landfill gas probes strategically located for perimeter monitoring, which can be utilized as wells in the future. The actual design of the specific components would be performed at the time that design drawings for construction are compiled. City of Stockton R.W.Sock and Associates 1811.002