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Environmental Consultants • 4707 Greenleaf Circle 209 545-8490 <br /> Suite F Fax 209 545-8391 <br /> Modesto, CA 95356 www.scsengineers.com <br /> SCS FIELD SERVICES <br /> April 24, 2006 <br /> File No. 07202055.00 <br /> Ms. Christina Carbajal - <br /> Forward Landfill <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 Ms. Carbajal: <br /> This letter provides a,status report on the operation, monitoring, and maintenance (O&M)work <br /> performed by SCS Field Services (SCS)on the subject system. All activities were performedin <br /> accordance witb our approved contract work scope dated February 14, 2003. Below is a summary <br /> of O&M efforts during the period of March I through.3 l, 2006. Note that during the beginning- <br /> of this reporting period-the UG'Coilection System was test operated and adjusted by <br /> others. <br /> Conclusions and Recommendations <br /> As of the dates of our testing,the LFG control facilities appeared to be operating satisfactorily and <br /> Renerally meeting the operational criteria with the exception of elevatedmethane gas <br /> concentrations detected at Perimeter Monitoring Probe Nos. GP-11 a,d GP-12 (up to 58.5 percent <br /> by volume). Also, on March 8. 2006, SCS performed monitoring of Temporary Gas Probes, <br /> nr 'z ,aQl1 TGl?-39. as dTrectcd by tlae Clzent. Results cfthis -_1on:torIng <br /> _ , <br /> r• ? Com'' <br /> ons in e7 cess oT the LEL V%Jere detected at. s--vcral to :-H, -s <br /> inndicat_d that rncthui.. gas con :strati, <br /> tasted (up to 59.8 percent by volume)_ Note..that these probes are intended nor evaluation purposes <br /> only and are not compliance locations. All LFG extraction-wells were observed to be receiving <br /> adequate vacuum. and. several were aqjusted during this monitoring period. Recommendations <br /> regarding repair or maintenance activities may be contained in subsequent sections of this <br /> report. Please ad-vise SCS as soon as possible regarding implementation of these <br /> recommendations. <br /> R ackaround <br /> As you know, the Forward/Austin Landfill site is an active organic refuse disposal. site. By way of <br /> background, organic materials buried in a landfill decompose anaerobicall.y(in the absence of <br /> oxygen)producing a combustible gas, which contains approximately 50 to 60 percent methane,40 <br /> to 50 percent carbon dio=xide,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 /> Offices Nationwide <br />