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• <br />• <br />V <br />Environmental Consultants <br />and Contractors <br />October 8, 2006 <br />File No. 07202055.00 <br />Ms. Christina Carbajal <br />Forward Landfill <br />9999 South Austin Road <br />Manteca, California 95335 <br />4707 Greenleaf Circle 209 545-8490 <br />Suite F FAX 209 545-8391 <br />Modesto, CA 95356 www.scsfieldservices.com <br />Subject: Third Quarter 2006, Perimeter Landfill Gas (LFG) Monitoring Probe and On-site <br />Structure Testing at the Forward Landfill, Manteca, California <br />Dear Mr. Caffey: <br />This letter provides results of gas monitoring probes (GMP) and on-site structure testing for the <br />Third Quarter of 2006 (July through September) performed by SCS Field Services (SCS). All <br />testing, monitoring protocols and reporting were performed in general conformance with Title 27 <br />California Code of Regulations (CCR) Sections 20915.5 and 20931 through 20934 and the <br />California Integrated Waste Management Board (CIWMB) Landfill Gas Monitoring Procedures, <br />Advisory No. 44, dated August 29, 1997. Briefly, these regulations require that solid waste <br />disposal site owners/operators implement LFG control or monitoring provisions to ensure that <br />methane gas concentrations in soils at the property boundary do not exceed the lower explosive <br />limit (LEL, or 5 percent by volume) and that interiors of on-site structures do not exceed 1.25 <br />percent by volume in air. Below is a summary of our quarterly monitoring activities. <br />Summary and Conclusions <br />During this reporting period, no methane gas (the combustible component of LFG) in excess of the <br />LEL was detected at any perimeter subsurface GP probe location tested or in excess of 1.25 percent <br />by volume in air at any interior locations of on-site structures. These results indicate that at the <br />time of our testing the subject site perimeter subsurface GP probes and interiors of on-site <br />structures are in compliance with requirements of Title 27 CCR Sections 20919.5 and 20931 <br />through 20934. <br />Also, during this reporting period, SCS performed testing of Temporary Subsurface Evaluation <br />Monitoring Probe Nos. TGP-01 through TGP-39. Results of this testing indicated that up to 58.6 <br />percent methane gas was detected at several of these monitoring locations. Note, that these <br />locations are for evaluation purposes only and are not compliance locations. <br />