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W <br />HENRY M. HIRATA <br />DIRECTOR <br />July 26, 1996 <br />0 0 <br />COUNTY OF SAN JOAQUIN <br />DEPARTMENT OF PUBLIC WORKS <br />P. O. SOX 1810 - 1810 E. HAZELTON AVENUE <br />STOCKTON. CALIFORNIA 95201 <br />(209) 468-3000 <br />FAX (209) 468-2999 <br />M E M O 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 Engineer <br />SUBJECT: LANDFILL GAS MONITORING AT THE <br />FOOTHILL SANITARY LANDFILL <br />THOMAS R. FLINN <br />DEPUTY DIRECTOR <br />MANUELLOPEZ <br />DEPUTY DIRECTOR <br />STEVEN WINKLER <br />DEPUTY DIRECTOR <br />On June 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 used a Landtec GEM 500 landfill gas monitor. The GEM <br />500 is capable of detecting methane in total percentages and <br />Lower Explosive Limit, Carbon Dioxide, and Oxygen concentrations. <br />In addition, the GEM is capable of measuring pressure and gas <br />flow. The instrument was calibrated using calibration gas <br />canisters containing (1) 15 percent methane, 15 percent Carbon <br />Dioxide, balance Nitrogen, and (2) 4 percent Oxygen, balance <br />Nitrogen. <br />The results from the June 1996 monitoring event are shown on the <br />attached map. The readings for all holes and structures are <br />shown adjacent to their locations on the map. <br />If you have any questions, please call me at Extension 83066. <br />GK:WJ: vj <br />R:IVIRGINIAIMEMOSIFHGASMON.EP <br />Attachment <br />c: Scott Walker, California Integrated <br />Waste Management Board <br />LA 63229 <br />LA 31209 <br />