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COUNIF SAN JAQI THOMAS R. FLINN <br /> x 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 vF A' DEPUTY DIRECTOR <br /> HENRY M.HIRATA <br /> DIRECTOR <br /> May 3, 1999 <br /> MEMORANDUM <br /> TO: Robert McClellon, Lead Senior R.E.H.S. <br /> Public Health Services <br /> Environmental Health Division <br /> FROM: Wes Johnson <br /> Associate Civil Engineer <br /> SUBJECT: LANDFILL GAS MONITORING AT THE <br /> FOOTHILL SANITARY LANDFILL <br /> On April 30, 1999, Solid Waste Division staff monitored for landfill gas migration at the Foothill <br /> 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 Landtec GEM 500 Gas Extraction Monitor to perform the monitoring. The <br /> instrument was calibrated by County Staff prior to monitoring. Results from the Second Quarter <br /> 1999 Monitoring Event are shown on the attached map with readings for all probes and <br /> structures shown adjacent to their locations. <br /> If you have any questions,please call me at 468-3066. <br /> WJ:MK:rh <br /> S:\WES\FH\GAS\2-99GSM.WPD <br /> Attachment <br /> c: Scott Walker; California Integrated Waste Management Board <br /> LA 31209 <br />