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PpU1N <br /> P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> THOMAS R. FLINN STOCKTON,CALIFORNIA 95201 <br /> DIRECTOR (209)468-3000 FAX(209)468-2999 <br /> •c4�FpQ�P• www.sigov.org/pubworks <br /> THOMAS M.GAU t^ <br /> CHIEF DEPUTY DIRECTOR <br /> MICHAEL SELLING Working for YOU <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> ROGER JANES <br /> BUSINESS ADMINISTRATOR June 28, 2010 <br /> Mr. Robert McClellon, REHS <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> SUBJECT: REVISED LANDFILL GAS MONITORING PLAN, FOOTHILL SANITARY LANDFILL <br /> Dear Mr. McClellon: '-6 <br /> Enclosed, please fin an update of the Landfill Gas Monitoring Plan for Foothill Sanitary Landfill. <br /> This Plan incorporates the perimeter migration monitoring wells that were installed in 2009 in <br /> accordance with California Code of Regulations (CCR) Section 20925 et seq. and with the <br /> preliminary Plan submitted for your approval in September 2008. <br /> Migration monitoring wells were drilled to an elevation of 160 ft. mean sea level (msl), 20 feet <br /> below the present landfill design elevation of 180 ft msl. This allows the flexibility of lowering the <br /> refusd 20 feet in the future, if needed. <br /> Well SG-12 is retained in the monitoring network, as discussed. This well was installed in 2004 to <br /> a depth of 218 ft msl in accordance with the regulations applicable at the time, which required the <br /> wells to be drilled to the lowest elevation of the refuse within 1000 feet of the well. Presently, Well <br /> SG-12 extends six feet below the lowest refuse in place (224 ft msl in Module 1); therefore, our <br /> monitoring system remains in compliance until refuse is placed below 218 ft msl. We contemplate <br /> re-installing SG-12 in the Module 2 construction project. <br /> If you have any questions, please contact me at 468-8504. <br /> Sincerely, <br /> W. MICHAEL CARROLL, PE <br /> Senior Civil Engineer <br /> WMC:kb <br /> N:\1 Foothill\LFG perimMonit\GasMonitPlan-Forms\RMcClellon06-Rev FHGasPlan.doc <br /> Enclosure <br /> LA 10631 <br /> LA 31029 <br />