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e <br /> THOMAS R. FLINN P.o.BOX 1810-1810 E. HAZELTON AVENUE <br /> DIRECTOR STOCKTON,CALIFORNIA 95201-3018 <br /> (209)468-3000 FAX(209)468-2999 <br /> C'�Gp°pN\p www.co.san-joaquin.ca.us <br /> THOMAS M.GAU <br /> DEPUTY DIRECTOR <br /> MANUELSOLORIO worlemg for YOU <br /> DEPUTY DIRECTOR (J f_ `. <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR OCT 0 2004 <br /> BENTON ANGOVE g 41 <br /> BUSINESS ADMINISTRATOR <br /> October 1, 2004 ' <br /> Mr. Robert McClellon, Lead Senior R.E.H.S. <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> SUBJECT: SIGNIFICANT REDUCTION OF COMBUSTIBLE GAS CONCENTRATIONS, <br /> HARNEY LANE SANITARY LANDFILL <br /> Dear Mr. McClellon: <br /> This letter is in response to your letter dated September 7, 2004, regarding the methane gas <br /> detections at the closed Harney Lane Landfill. We take the indication of migration of landfill gas <br /> from our sites very seriously, and are most pleased to report that the combustible gas concentrations <br /> at the northwest portion of the Harney Lane Sanitary Landfill have been significantly reduced by <br /> our remediation measures. <br /> For ease of understanding, I would like to address the items of your letter in order. <br /> 1: Remedial Efforts Against LFG Migration <br /> Our remedial efforts included resetting the LFG header to remove zones of condensate <br /> accumulation, and the aggressive adjustment of the LFG wells in the area near the affected probes <br /> to maximize LFG collection. Full system function was restored September 15, 2004, and <br /> aggressive adjustment began immediately afterward. Recent data indicate that these efforts have <br /> been effective (see table below). <br /> Although we expect some variation in combustible gas levels as migration control is fully <br /> established, we anticipate full compliance in the near future. <br /> Our remedial efforts will continue, which include continuing aggressive adjustment of the LFG <br /> system. In particular, we have asked our operator contractor to focus on reducing the methane <br /> content at GW-3D (see Table). <br />