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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. According to <br /> closure regulations, the wells are to be monitored quarterly for <br /> methane. However, the letter dated December 19, 1991 from the <br /> Local Enforcement Agency (LEA) required six monthly gas <br /> monitoring events for the perimeter landfill gas monitoring <br /> wells. In addition, the LEA required three monthly events for <br /> on-site structures, and farm labor camp structures. All monthly <br /> events have been completed. Structure and gas probe monitoring <br /> is now performed quarterly. <br /> GAS PROBE MONITORING <br /> The County performed the first quarterly gas probe monitoring <br /> event at the Harney Lane Sanitary Landfill on 1\29\93 . Methane <br /> levels were generally similar to previous monitoring events. <br /> Table 1 shows the probe monitoring results. Gas probe monitoring <br />