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The Harney Lane Sanitary Landfill is located on Harney Lane <br /> approximately 7 miles east of Lodi, California (Figure 1) . The <br /> site is a Class III landfill which stopped accepting waste in <br /> November, 1991. A Migrant Farm Labor Camp is located adjacent to <br /> the landfill along the western boundary. The structures in the <br /> labor camp are occupied part of 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 a quarterly gas probe monitoring event at <br /> the Harney Lane Sanitary Landfill on 2/4/94. Methane levels were <br /> generally similar to previous monitoring events. Table 1 shows <br /> the probe monitoring results. <br />