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pU,IN <br />G <br />2: 2 <br />THOMAS R. FLINN <br />DIRECTOR <br />4��FO.QN <br />HOMIAS M. GAU <br />CHIEF DEPUTY DIRECTOR <br />MICHAEL SELLING <br />DEPUTY DIRECTOR <br />STEVEN WINKLER <br />DEPUTY DIRECTOR <br />ROGERJANES <br />BUSINESS ADMINISTRATOR <br />Mr. Robert McClellon, REHS <br />Environmental Health Department <br />600 East Main Street <br />Stockton, California 95202 <br />Mn`i CI <br />June 28, 2010 <br />P. O. BOX 1810 - 1810 E. HAZELTON AVENUE <br />STOCKTON, CALIFORNIA 95201 <br />(209)468-3000 FAX (209)468-2999 <br />www.sjgov.org/pubworks <br />SUBJECT: REVISED LANDFILL GAS MONITORING PLAN, FOOTHILL SANITARY LANDFILL <br />Dear Mr. McClellon: LA <br />Enclosed, please fend 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 />refuse 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 />NA1Foothil1\LFG perimMon MGasMonitPlan-Forms\RMCCleIlon06-Rev FHGasPlan.doc <br />Enclosure <br />LA 10631 <br />LA 31029 <br />