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2 ? 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 /> �'q•., a�Q (209)468-3000 STEVEN WINKLER <br /> ►FOR FAX(209)468-2999 DEPUTY DIRECTOR <br /> HENRY M.HIRATA <br /> DIRECTOR <br /> October 29, 1998 <br /> MEMQRANDUM <br /> TO: Robert McClellon, REHS <br /> Public Health Services <br /> Environmental Health Division <br /> FROM: Wes Johnson i,') <br /> Associate Civil Engineer <br /> SUBJECT: LANDFILL GAS MONITORING AT THE <br /> FOOTHILL SANITARY LANDFILL <br /> On October 22, 1998, Solid Waste Division staff monitored for landfill gas migration at the <br /> Foothill Sanitary Landfill. In accordance with a previous request from the Environmental Health <br /> Division, PVC pipes with caps are monitored for methane at four locations. The pipes are open <br /> at the bottom and they are approximately 2.5 feet deep. <br /> The County used a GasTech Landfill Monitor to perform the monitoring. The instrument was <br /> calibrated using standard GasTech gas calibration canisters prior to monitoring. The results from <br /> the fourth quarter 1998 monitoring event are shown on the attached map. The readings for all <br /> probes and structures are shown adjacent to their locations on the maps. If you have any <br /> questions, please call me at 468-3066. <br /> WJ:MK:cg <br /> R:%CONSTANCTIAGASW-98GSNE.W PD <br /> Attachment <br /> c: Scott Walker, California Integrated Waste Management Board <br /> LA 31209 <br />