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Environmental Consultants 4730 Enterprise Way 209 545-8490 and Contractors Suite A FAX 209 545-8391 • Modesto,CA 95356 www.scsengineers.com March 31, 2017 File No. 07217035.00 Mr. Joseph Lipka Environmental Manager Republic Services Inc. 9999 S. Austin Road, Manteca, California 95336 Subject: First Quarter 2017, Perimeter Landfill Gas (LFG) Monitoring Probe Testing at the French Camp Landfill, Stockton, California Dear Mr. Lipka: This letter provides results of gas monitoring probes(MP) testing for the first quarter of 2017 (January through March)performed by SCS Field Services (SCS). All testing,monitoring protocols and reporting were performed in general conformance with Title 27 California Code of Regulations(CCR) Article 6. Briefly,these regulations require that solid waste disposal site owners/operators implement LFG control or monitoring provisions to ensure that methane gas concentrations in soils at the property boundary do not exceed the lower explosive limit(LEL or 5 percent by volume). Below is a summary of our quarterly monitoring activities. SUMMARY AND CONCLUSIONS On March 31, 2017, no methane gas(the combustible component of LFG) in excess of the LEL was detected at any perimeter subsurface monitoring probe location tested. These results indicate that at the time of our testing the subject site perimeter subsurface monitoring probes are in compliance with requirements of Title 27 CCR Article 6. GAS TESTING INSTRUMENTATION AND METHODS Testing for methane gas, oxygen gas, carbon dioxide gas and pressure was performed using a Landtec GEM-5000 Gas Analyzer calibrated to methane gas. These instruments measure combustible gas concentrations in air directly on either of two scales, the first as percent by volume of the lower explosive limit(LEL) of methane gas in air(0 to 5 percent); the other as percent by volume(0 to 100 percent) in the gas sampled. The detection limit for both instruments is approximately 0.10 percent by volume. Gases monitoring well testing procedures are as follows: • Connect sample tubing, open test valve; observe pressure and record data.