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HENRY M. HIRATA <br />DIRECTOR <br />April 9, 1996 <br />El <br />COUNTY OF SAN JOAQUIN THOMAS R. FLINN <br />DEPARTMENT OF PUBLIC WORKS DEPUTY DIRECTOR <br />P. O. BOX 1810 - 1810 E. HAZELTON AVENUE MANUEL LOPEZ <br />STOCKTON. CALIFORNIA 95201 DEPUTY DIRECTOR <br />(209) 468-3000 STEVEN WINKLER <br />FAX(209)468-2999 DEPUTY DIRECTOR <br />M E M 0 R A N D U M <br />TO: Ed Padilla, SREHS <br />Public Health Services <br />Environmental Health Division <br />FROM: Gabriel Karam <br />Senior Solid Waste 2ngineer <br />SUBJECT: LANDFILL GAS MONITORING AT THE <br />FOOTHILL SANITARY LANDFILL <br />On March 28, 1996, Solid Waste Division staff monitored for <br />landfill gas migration in accordance with previously submitted <br />monitoring plans for the Foothill Sanitary Landfill. <br />The County recently purchased a Landtec GEM 500 landfill gas <br />monitor. The GEM 500 is capable of detecting methane in total <br />percentages and Lower Explosive Limit, Carbon Dioxide, and oxygen <br />concentrations. In addition, the GEM is capable of measuring <br />pressure and gas flow. As previously reported in a memo to the <br />San Joaquin County Environmental Health Division, the County's <br />Gas Tech Landfill monitor had to be sent in for repairs. <br />Therefore, the GEM 500 was used to perform the first quarter <br />monitoring event for the Foothill Sanitary Landfill. The County <br />will continue to use the GEM 500 for future monitoring events. <br />The instrument was calibrated using calibration gas canisters <br />containing (1) 15% methane, 15% Carbon Dioxide, balance Nitrogen, <br />and (2) 4% Oxygen, balance Nitrogen. <br />The results from the January 1996 monitoring event are shown on <br />the attached map. The readings for all holes and structures are <br />shown adjacent to their locations on the map. <br />