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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 /> SCS F1 ELD SERVICES <br /> January 10, 2018 <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: Fourth Quarter 2017, Perimeter Landfill Gas (LFG) Monitoring Probe and <br /> On-Site 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 /> fourth quarter of 2017 (October through December)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 October 5 2017, no methane gas (the combustible component of LFG) in excess of the LEL <br /> was detected at any perimeter subsurface compliance GP probe location tested or in excess of <br /> 1.25 percent by volume in air at any interior locations or on-site structures. These results indicate <br /> that at the time of our testing the subject site perimeter subsurface GP probes and interiors of on- <br /> 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 /> Gas monitoring well testing procedures are as follows: <br />