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c ?a <br /> THOMAS R. FLINN P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> ` Nt� STOCKTON,CALIFORNIA 95201-3018 <br /> DIRECTOR <br /> P a (209)468-3000 FAX(209)468-2999 <br /> c9��Foadwww.co.san-joaquin.ca.us <br /> THOMAS M.GAU <br /> DEPUTY DIRECTOR a lye <br /> MANUEL SOLORIO Working for YOU <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR July 15, 2004 <br /> BENTON ANGOVE <br /> BUSINESS ADMINISTRATOR <br /> MEMORANDUM <br /> TO: Robert McClellon,Lead Senior R.E.H.S. <br /> Environmental Health Department <br /> FROM: W. Michael Carroll PE <br /> Senior Civil Engineer: <br /> SUBJECT: SECOND QUARTER 2004 PERIMETER LANDFILL GAS MONITORING <br /> AT THE HARNEY LANE SANITARY LANDFILL <br /> Enclosed,please find the results of the Harney Lane Landfill Gas Migration Monitoring for the Second <br /> Quarter of 2004. With the exception of the detection of combustible gas above five percent at GW-1, all <br /> monitoring probes and monitored structures were found to be in compliance with Title 27, <br /> Section 20921(a)(1),and(2). <br /> We do not believe that the exceedences at GW-1 threaten human health and safety at this time,based on the <br /> lack of combustible gas in the foundations of the buildings of the migrant worker housing facility nearest the <br /> monitoring perimeter(data attached). We will monitor these buildings monthly until compliance at GW-1 is <br /> restored. <br /> We believe that the exceedences at GW-1 are the result of insufficient vacuum applied by the LFG(landfill <br /> gas) collection system serving this area of the landfill. We have identified a segment of LFG header along <br /> the western slope that has apparently experienced sufficient settlement to cause blockage by condensate, <br /> restricting LFG collection from this area(see Figure 1). <br /> We are in the process of scheduling the repair of this header section to restore sufficient header vacuum to <br /> the affected area. We expect that once the header is repaired and vacuum is restored,that the levels of <br /> combustible gas in the probes at GW-1 will gradually decrease to previous compliance levels. <br /> Quarterly monitoring will continue in accordance with Title 27 CCR Section 20921. <br /> If you have any questions,please contact me at 468-3066. <br /> WMC:mr <br /> NAI Harney Lane\LFG MonitData\2004\2ndQtr2004RptCoverLetter.doc <br /> Enclosure <br /> c: Gino Yekta <br /> California Integrated Waste Management Board <br /> CAL-EPA Building <br /> 1001 "I" Street <br /> Sacramento, California 95812-4025 <br /> LA 11458 <br />