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.• <br />FORWARD <br />�. L A N D F I L L <br />v <br />November 3, 2008 <br />la <br />9999 S. Austin Road <br />Manteca CA 95336 <br />(209) 982-4298 • Fax (209) 982-1009 <br />Mr. Robert McClellon 0 7 2008 <br />San Joaquin County <br />Environmental Health Department ENViRONMI iVT gEALT <br />600 East Main Street PERNAITISER�� CES <br />Stockton, CA 94520 <br />Subject: Landfill Areas of Concern Associated with Subsurface Fires at <br />Forward Landfill, San Joaquin County, California. <br />Dear Robert: <br />Per our discussion onsite last week, this letter outlines the activities that Forward Landfill <br />will implement to help prevent any additional subsurface fires. Several fires occurred <br />this summer and late fall associated with extremely dry cover soil conditions. The dry <br />conditions coupled with ongoing landfill gas collection necessary to prevent gas <br />migration, allowed for air to infiltrate into the waste and subsequently created an <br />environment allowing for combustion. The areas of concern are located along the <br />southwest edge of Austin Road Landfill, Waste Management Unit's (WMU) FU -03 thru <br />FU -06, within 10 to 20 feet of the toe of the landfill slope. This area is also adjacent to <br />the main landfill gas collection line. <br />Forward landfill will disk and track compact the lower section of the southwest slope in <br />an effort to seal any existing dry weather cracking. An additional two feet of low <br />permeability material will be placed and track compacted over the top of the intermediate <br />cover, from an area extending from WMU FU -03 to WMU FU -06, from the base of the <br />toe, upslope approximately twenty feet. <br />The disking and compaction of the existing slope and additional two feet of placed and <br />compacted low permeability material should provide an adequate seal to minimize any <br />future air infiltration issues. This area of concern shall be monitored throughout the year. <br />If any additional cracking or areas of concern are observed, Forward will immediately <br />repeat the above process. <br />If you have any questions or need additional information please call me at (209) 982- <br />4298. <br />Sincerel <br />!r2 hk—'? <br />Don Litchfield <br />Environmental Manager <br />Forward Landfill <br />0% 30% total <br />to* recycled fiber <br />