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Environmental Consultants 4730 Enterprise Way 209 545-8490 <br /> and Contractors Suite A FAX 209 545-8391 <br /> Modesto,CA 95356 www.scsengineers.com <br /> • <br /> October 10, 2017 <br /> File No. 07217034.00 <br /> Mr. Joseph Lipka <br /> Environmental Manager <br /> Republic Services Inc. <br /> 9999 S. Austin Road, <br /> Manteca, California 95336 <br /> Subject: Third Quarter 2017, Perimeter Landfill Gas (LFG) Monitoring Probe and On-Site <br /> Structure Testing at the Forward Landfill, Manteca, California <br /> Dear Mr. Lipka: <br /> This letter provides results of gas monitoring probes (GMP) and on-site structure testing for the <br /> third quarter of 2017 (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) 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 /> SUMMARY AND CONCLUSIONS <br /> On July 6 and September 29, 2017,no methane gas (the combustible component of LFG) in <br /> excess of the LEL was detected at any perimeter subsurface compliance GP probe location tested <br /> or in 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 /> GAS TESTING INSTRUMENTATION AND METHODS <br /> Testing for methane gas, oxygen gas, carbon dioxide gas and pressure was performed using a <br /> Landtec GEM-5000 or Gastech GT-302 Gas Analyzer calibrated to methane gas. These <br /> instruments measure combustible gas concentrations in air directly on either of two scales, the <br /> second as percent by volume of the lower explosive limit(LEL) of methane gas in air(0 to 5 <br /> percent); the other as percent by volume (0 to 100 percent) in the gas sampled. The detection limit <br /> for both instruments is approximately 0.10 percent by volume. <br />