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Environmental Consultants 0 4,707 Greenleaf Circle 209 343-8490 Suite F Fax 209 505-6391 Modesto, CA 95356 www.scsi^n9ineer3.c0m April 24, 2006 File No. 07202055.00 Ms, Christina Carbajal - Forward Landf 1.1 9999 S. Austin Road Manteca, California 95336 Subject: Operation,Monitoring, and.Maintenance of the Landfill Gas(LFG) Migration. Control Facilities at the Forward/,Austin Landfill,Manteca,California Dear Ms. Carbaj al: This letter provides a.status report on the operation, monitoring, and maintenance(O&M)work performed by SCS Field Services (SCS)on the subject system. All activities were performed,in accordance with our approved contract work scope dated February 14, 2003. Below is a summary of O&M efforts during the period.of March 1- through.31, 2006. Note that duriztg th . e beginnia�g- of this ireparting period-the LFGCO1166tion System:was-test operated and adjusted by others. Conclusions and Recommendations As of the dates of our testing,the LFG control facilities appeared to be operating satisfactorily and generally meeting the operational criteria with the exception of elevated,methane gas concentrations detected at Perimeter Monitoring Probe Nos. GP-11 arid GP-12 (up to 58.5 percent by voluine). Also, on March 8, 2006, SCS performed monitoring of Temporary Gas Probes, a C7 ,i.r�vd as s ti,. -01 tb maah TGP-39. as directed bV he Client. Results afthis monitoring i,ndiCa`ted that-nethane cras concentrations in ef>C--Ss 02 th- LEL detected at several locations tested (up to 59.8 ,percent by volume)_ Note,that these probes are intended for evaluation purposes only and are not compliance locations. All LFG extraction'wells Nvere observed to be receiving adequate vacuum. and several were adjusted during this monitoring period. Recommendations regarding repair or maintenance activities may be contained in subsequent sections of this report. Please advise SCS as soon-as possible regarding implementation of these recommendations. Raekuround As you know, the Forward/Austin Landfill site is an active organic refuse disposal. site. By way of background, organic materials buried in a landfill decompose anaerobically(in the absence of oxygen)producing a combustible gas, which contains approximately 50 to 60 percent methane,40 to 50 percent carbon dioxide,and trace amounts of various oth,er. gases, some of which are odorous. The Forward/Austin property contains a system.to control the combustible gases generated in the landfill. Offices Nationwide