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The Harney Lane Sanitary Landfill is located on Harney Lane <br /> approximately 7 miles east of Lodi (Figure 1) . A Migrant Farm <br /> Labor Camp is located adjacent to the landfill along the western <br /> boundary. The structures in the labor camp are occupied part of <br /> the year by farm workers. <br /> ' In accordance with closure regulations, a network of perimeter gas <br /> monitoring wells was installed by EMCON Associates in October, 1991 <br /> (Figure 2) . The wells are no more than 1000 feet apart and are <br /> ' spaced much closer than 1000 feet along the boundary with the labor <br /> camp to ensure detection of possible methane migration toward the <br /> structures. Each well contains three monitoring probes set at <br /> varying depths. According to closure regulations, the wells are to <br /> be monitored quarterly for methane. However, the letter dated <br /> December 19 , 1991 from the Local Enforcement Agency (LEA) requires <br /> six monthly gas monitoring events for the perimeter landfill gas <br /> monitoring wells. In addition, the LEA required three monthly <br /> events for on-site structures, and farm labor camp structures. <br /> STRUCTURE MONITORING <br /> On September 11, 1992 , San Joaquin County performed the final <br /> monthly labor camp monitoring. Present during monitoring were <br /> Jerry Wickes of the San Joaquin County Environmental Health <br /> Division, and Robert Reed of the County Housing Authority. <br /> The equipment used was a Gas Tech Landfill Monitor equipped with <br /> parts per million (ppm) , Lower Explosive Limit (5%) , and 100% gas <br />