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HARNEY LANE SANITARY LANDFILL LFG MIGRATION MONITORING <br /> Monitoring Completed: September 18, 2003 <br /> Landfill Location <br /> The Harney Lane Sanitary Landfill is located on Harney Lane, approximately seven <br /> miles east of Lodi, California(Figure 1). The site is a closed Class III landfill which <br /> stopped accepting waste in May 1995. A Migrant Farm Labor Camp is located adjacent <br /> to the landfill along the western boundary. The structures in the labor camp are occupied <br /> part of the year by farm workers. <br /> In accordance with closure regulations, a network of perimeter gas monitoring wells was <br /> installed by EMCON Associates in October 1991 (Figure 2). Each well contains three <br /> monitoring probes set at varying depths. <br /> The wells are spaced no more than 1,000 feet apart, and are much closer than 1,000 feet <br /> along the boundary with the labor camp. This spacing ensures detection of possible <br /> methane migration toward the structures. <br /> Monitoring System and Equipment <br /> The twelve wells were monitored for methane on September 18,by SCS Field Services. <br /> SCS used a Landtec GEM 500 Gas Extraction Monitoring Instrument which was <br /> calibrated prior to the sampling event. The Landtec GEM 500 is capable of measuring <br /> methane,carbon dioxide, oxygen, and nitrogen(balance gas)concentrations. The wells <br /> were monitored in accordance with California Integrated Waste Management Board by <br /> purging at least one probe volume prior to taking a reading. The County has calculated <br /> the volume of gas that constitutes a probe volume for each probe. A purge time has been <br /> calculated for each probe using the manufacturer's pump rate information for the GEM <br /> 500. Once the time has been reached indicating that one probe volume has been purged, <br /> the combustible gas concentration was monitored. If the indicated gas concentrations <br /> were not stable at the end of the purge time,purging continues until gas concentrations <br /> reach steady-state, at which time the concentrations were recorded. <br /> Harney Lane Landfill October 22,2003 <br /> San Joaquin County 2 Quarterly LFG Monitoring <br />