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Environmental Consultants <br />and Contractors <br />October 10, 2017 <br />File No. 07217035.00 <br />Mr. Joseph Lipka <br />Environmental Manager <br />Republic Services Inc. <br />9999 S. Austin Road, <br />Manteca, California 95336 <br />4730 Enterprise Way <br />Suite A <br />Modesto, CA 95356 <br />209 545-8490 <br />FAX 209 545-8391 <br />www.scsengineers.com <br />Subject: Third Quarter 2017, Perimeter Landfill Gas (LFG) Monitoring Probe Testing at <br />the French Camp Landfill, Stockton, California <br />Dear Mr. Lipka: <br />This letter provides results of gas monitoring probes (MP) testing for the third quarter of 2017 <br />(July through September) performed by SCS Field Services (SCS). All testing, monitoring <br />protocols and reporting were performed in general conformance with Title 27 California Code of <br />Regulations (CCR) Article 6. Briefly, these regulations require that solid waste disposal site <br />owners/operators implement LFG control or monitoring provisions to ensure that methane gas <br />concentrations in soils at the property boundary do not exceed the lower explosive limit (LEL or <br />5 percent by volume). Below is a summary of our quarterly monitoring activities. <br />SUMMARY AND CONCLUSIONS <br />On September 30, 2017, no methane gas (the combustible component of LFG) in excess of the <br />LEL was detected at any perimeter subsurface monitoring probe location tested. These results <br />indicate that at the time of our testing the subject site perimeter subsurface monitoring probes are <br />in compliance with requirements of Title 27 CCR Article 6. <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 Gas Analyzer calibrated to methane gas. These instruments measure <br />combustible gas concentrations in air directly on either of two scales, the first as percent by volume <br />of the lower explosive limit (LEL) of methane gas in air (0 to 5 percent); the other as percent by <br />volume (0 to 100 percent) in the gas sampled. The detection limit for both instruments is <br />approximately 0. 10 percent by volume. <br />Gases monitoring well testing procedures are as follows: <br />• <br />C, <br />• Connect sample tubing, open test valve; observe pressure and record data. <br />0 <br />