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COUNTY OF SAN JOAQUIN THOMAS M.GAU <br /> DEPUTY DIRECTOR <br /> DEPARTMENT OF PUBLIC WORKS <br /> P.O. BOX 1810- 1810 E. HAZELTON AVENUE <br /> STOCKTON, CALIFORNIA 95201 MANUEL SOLORIO <br /> INTERIM DEPUTY DIRECTOR <br /> (209) 468-3000 <br /> THOMAS R. FLINN FAX (209) 468-2999 <br /> INTERIM DIRECTOR <br /> STEL[ WINKLER <br /> DE, DIRECTOR <br /> August 20, 2001 <br /> MEMORANDUM <br /> Cr <br /> co <br /> TO: Robert McClellon,Lead Senior R.E.H.S. <br /> Public Health Services <br /> Environmental Health Division <br /> FROM: Dan Johnson <br /> Assistant Engineer <br /> SUBJECT: LANDFILL GAS MONITORING AT THE MIGRANT FARM LABOR CAMP <br /> County staff monitored the farm labor camp adjacent to Harney Lane Sanitary Landfill for methane on <br /> August 1, 2001, using the GasTech Landfill Monitor which was calibrated by County staff prior to <br /> sampling. The first thirteen structures nearest to the landfill and the vents from the eleventh and twelfth <br /> structures were tested for methane. <br /> Small traces of gas were found in units#3, #9, #14,#15 and#20. Units#3, and#14 had detections of up <br /> to 500 ppm, whereas units#9, #15 and#20 had detections up to 200 ppm. In each of these cases,the <br /> highest detections were found behind or in the immediate vicinity of the ovens. Additionally the odor of <br /> utility gas was present in all cases. Because of this, the County believes that the emissions were coming <br /> from loose connections behind the ovens. The manager of the labor camp was notified of leaks. There <br /> were also minor detections at the vents of the two structures tested. Initial readings of 200 ppm and 150 <br /> ppm were detected in the vents of the eleventh and twelfth structures respectively, however the readings <br /> dropped back to zero within 45 seconds in both cases. <br /> No sustained emissions were found coming from the vents of the structures. <br /> The next monitoring event will be performed in October 2001. <br /> Please call me at 468-3066, if you have any questions. <br /> DJ:vn <br /> NADan\11[\C7w\3rd200I camp.wpd <br /> c: Gino Yekta, California Integrated Waste Management Board <br /> LA 11458 <br />