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0 <br /> HARNEY LANE SANITARY LANDFILL LFG MIGRATION MONITORING <br /> Monitoring Completed: June 24, 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 June 13 and 24, 2003,by SCS Field <br /> Services. SCS used a Landtec GEM 500 Gas Extraction Monitoring Instrument which <br /> was calibrated prior to the sampling event. The Landtec GEM 500 is capable of <br /> measuring methane, carbon dioxide, oxygen, and nitrogen (balance gas) concentrations. <br /> The wells were monitored in accordance with California Integrated Waste Management <br /> Board by purging at least one probe volume prior to taking a reading. The County has <br /> calculated the volume of gas that constitutes a probe volume for each probe. A purge <br /> time has been calculated for each probe using the manufacturer's pump rate information <br /> for the GEM 500. Once the time has been reached indicating that one probe volume has <br /> been purged,the combustible gas concentration was monitored. If the indicated gas <br /> concentrations were not stable at the end of the purge time,purging continues until gas <br /> concentrations reach steady-state, at which time the concentrations were recorded. <br /> Harney Lane Landfill September 15,2003 <br /> San Joaquin County 2 Quarterly LFG Monitoring <br />