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'rTA'TE OF CALIFORNIA GEORGE DEUKMEJIAN, Govemor CALIFORNIA WASTE MANAGEMENT BOARD OCT 2, 9 1987f 1020 NINTH STREET, SUITE 300 CRAMENTO, CA 95814 EVVIR®MENT AL HEALTH FERMIT/SERVICES Mr. Alan Biederman October 28, 1987 San Joaquin Local Health District P.O. Box 2009 Stockton, CA 95201 Subject: Report of Landfill Gas Migration Testing at French Camp Landfill, 39-AA-0002 On October 1, 1987 , staff person, Sharon Anderson, tested on-site structures for the presence of landfill gas by using an organic Vapor Analyzer (OVA) . This testing was prompted by a recommendation from the first and second Presley inspectors. Both inspectors indicated that, although no gas was detected in the soil by using a bar-hole punch and gas tech analyzer, gas could still be present in the structures. Three sides of the site are surrounded by a slough which provides an impermeable barrier for gas to escape or migrate. Staff test results were as follows: On-Site Structures: The two on-site structures consisted of a workshop/maintenance barn, and a residence. The maintenance barn was constructed on natural ground and had cement floors. The structure was tested in all areas and along cracks or paths of obvious gas migration. No vapors were detected above the background level of 1 ppm. The other structure, the residence, was constructed on a concrete pad. No landfill gas vapors were detected with the OVA in that building. Conclusions: Landfill gas was not detected in the ground near on-site structures, nor was gas detected inside them. There is no reason to believe that gas is migrating into the buildings at this time. The landfill has no gas monitoring system and the LEA has not suggested that the operator install probes. Sincerely, John K. Bell, Manager Monitoring Section JKB:SA:mea 39-AA-0002 CC: Joe Walker, Operator, Department of Public Works John Giambastiani, Supervisor