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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 /> r <br /> October 10,2016 <br /> File No. 07216031.00 <br /> Mr. Joseph Lipka <br /> Environmental Manager <br /> Republic Services Inc. <br /> 9999 S. Austin Road, <br /> Manteca, California 95336 <br /> Subject: Third Quarter 2016,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 2016 <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 CONCLUSION <br /> On September 30,2016,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 <br /> volume of the lower explosive limit(LEL)of methane gas in air(0 to 5 percent); the other as <br /> percent by volume(0 to 100 percent) in the gas sampled. The detection limit for both instruments <br /> is approximately 0.10 percent by volume. <br /> Gases monitoring well testing procedures are as follows: <br /> 0 Connect sample tubing, open test valve; observe pressure and record data. <br />