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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 <br /> gas monitoring wells was installed by EMCON Associates in <br /> October, 1991 (Figure 2) . The wells are no more than 1000 feet <br /> apart and are spaced much closer than 1000 feet along the <br /> boundary with the labor camp to ensure detection of possible <br /> methane migration toward the structures. Each well contains <br /> three monitoring probes set at varying depths. The wells are <br /> monitored quarterly for methane. <br /> GAS PROBE MONITORING <br /> The County performed the fourth quarterly gas probe monitoring <br /> 1 event at the Harney Lane Sanitary Landfill on 11/2/93 . Methane <br /> levels were generally similar to previous monitoring events. <br /> Table 1 shows the probe monitoring results. <br /> 1 <br />