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Environmental Consultants 4707 Greenleaf Circle 209 545-8490 <br />and Contractors Suite F FAX 209 545-8391 <br /> Modesto, CA 95356 www.scsengineers.com <br /> <br /> <br />March 30, 2012 <br />File No. 07207049.00 <br /> <br /> <br /> <br />Mr. Don Litchfield <br />Forward Landfill <br />9999 South Austin Road <br />Manteca, California 95335 <br /> <br />Subject: First Quarter 2012, Perimeter Landfill Gas (LFG) Monitoring Probe and On-Site <br />Structure Testing at the Forward Landfill, Manteca, California <br /> <br />Dear Mr. Litchfield: <br /> <br />This letter provides results of gas monitoring probes (GMP) and on-site structure testing for the <br />first quarter of 2012 (January through March) 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) Article 6. Briefly, these regulations require that solid <br />waste disposal site owners/operators implement LFG control or monitoring provisions to ensure <br />that methane gas concentrations in soils at the property boundary do not exceed the lower <br />explosive limit (LEL, or 5 percent by volume) and that interiors of on-site structures do not <br />exceed 1.25 percent by volume in air. Below is a summary of our quarterly monitoring activities. <br /> <br />SUMMARY AND CONCLUSIONS <br /> <br />During this reporting period, no methane gas (the combustible component of LFG) in excess of <br />the LEL was detected at any perimeter subsurface compliance GP probe location tested or in <br />excess of 1.25 percent by volume in air at any interior locations or on-site structures. These <br />results indicate that at the time of our testing the subject site perimeter subsurface GP probes and <br />interiors of on-site structures are in compliance with requirements of Title 27 CCR. <br /> <br />On February 23, 2012, SCS performed initial testing of the recently approved monitoring <br />network probes defined as (GP) Nos. 7R (A, B, C) through 12R (A, B, C) and 28R (A, B, C). <br />These locations have replaced the old perimeter monitoring network as authorized by the San <br />Joaquin County Local Enforcement Agency and Cal Recycle. Results of this monitoring <br />indicated that no methane gas concentrations in excess of 5 percent by volume were detected at <br />any location tested (Table 1). <br /> <br />Also, as requested by RSI (Republic Services Inc.), SCS previously performed weekly <br />monitoring of the original perimeter probes defined as Nos. GP-09, GP-10, GP-11 and GP-12.