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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 /> e <br /> April 24, 2006 <br /> File No. 07202055.00 <br /> Mr. Lochlin Caffey <br /> Forward Landfill <br /> 9999 South Austin Road <br /> Manteca, California 95335 <br /> Subject: First 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 /> First Quarter of 2006 (January through April) performed by SCS Field Services(SCS). All testing, <br /> 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 /> Surra ary 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 with the exception of GP-11 and GP- <br /> 12 (up to 71.4 percent by volume). These results indicate that at the time of our testing the subject <br /> site perimeter subsurface GP probes, with the exception of GP-11 and GP-12, and interiors of on- <br /> site 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 62.5 <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 /> Offices Nationwide <br />