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Environment:, Consultants 4707 Greenleaf Circle 209 545-8490 <br /> Suite F Fax 209 545-8391 <br /> Modesto, CA 95356 www.scsengineers.com <br /> October 7, 2003 <br /> File No. 07202055.00 <br /> Mr. Lawrence Stefani, Jr. <br /> 9999 S. Austin Road <br /> Manteca, California 95336 <br /> Subject: Operation,Monitoring, and Maintenance of the Landfill Gas (LFG) Migration <br /> Control Facilities at the Forward/Austin Landfill, Manteca, California <br /> Dear Mr. Stefam: <br /> This letter provides our first status report on the operation, monitoring, and maintenance (O&M) <br /> work performed by SCS Field Services (SCS) on the subject system. All activities were <br /> performed in accordance with our approved contract work scope dated February 14, 2003. <br /> Below is a summary of O&ill efforts during the period of September 1 through 30, 2003. <br /> Conclusions and Recommendations <br /> As of the dates of our testing, the LFG control facilities appeared to be operating satisfactorily <br /> and generally meeting the operational criteria. All LFG extraction wells were observed to be <br /> receiving adequate vacuum and several were adjusted during this monitoring period. <br /> Recommendations regarding repair or maintenance activities may be contained in <br /> subsequent sections of this report. Please advise SCS as soon as possible regarding <br /> implementation of these recommendations. <br /> BacklZround <br /> As you know, the Forward/Austin Landfill site is an active organic refuse disposal site. By way <br /> of background, organic materials buried in a landfill decompose anaerobically (in the absence of <br /> oxygen) producing a combustible gas, which contains approximately 50 to 60 percent methane, <br /> 40 to 50 percent carbon dioxide, and trace amounts of various other gases, some of which are <br /> odorous. The Forward/Austin property contains a system to control the combustible gases <br /> generated in the landfill. <br /> The gases produced in a landfill will either vent vertically to the atmosphere or migrate <br /> horizontally through subsurface soil to locations on adjacent properties. If the soil surrounding a <br /> landfill consists of permeable materials, there is a greater likelihood that the LFG will migrate to <br /> off-site locations. <br /> Offices Nationwide <br />