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Quarterly Progress Report-Fourth Quarter 2017 Austin Road Unit,Forward Landfill • trichloroethene were consistently measured above the practical quantitation limit during the fourth quarter monitoring event. Total VOC concentrations in the effluent ranged from 3.20 gg/L to 4.18 gg/L during the monitoring period. Landfill Gas Collection and Destruction System As of January 2017,the landfill gas collection and destruction system servicing the Austin Road Unit at the Forward Landfill consists of 129 active landfill gas extraction wells, according to Cornerstone Environmental (Cornerstone). Collected landfill gas is routed and split between the Ameresco Landfill Gas to Energy Facility(LFGEF) and Forward's Flare A-2 for thermal destruction,with Flare A- 1 serving as a back-up flare. On a weekly basis SCS Field Services, Inc. (SCS) records information such as methane gas concentration (percent by volume), oxygen concentration (percent by volume), carbon dioxide concentration (percent by volume), balance gas (percent by volume), flow rate standard cubic feet per minute (scfm), inlet pressure, outlet pressure, gas temperature at the inlet and outlet, and equivalent British Thermal Units (BTUs) consumed. The landfill gas collection and destruction system undergoes periodic maintenance to re-balance the collection vacuums to produce the highest percentage of landfill gas (e.g., methane) and to minimize the collection of oxygen. According to SCS,the landfill gas collection and destruction system experienced 43.3 hours of downtime during the fourth quarter 2017. A tabular summary of the downtime, monitoring results for individual landfill gas extraction wells, and Perimeter Landfill Gas Monitoring Probe and On-Site Structure Testing report for the fourth quarter 2017 are presented in Attachment C. Based on information provided by Cornerstone, there were no known system failures of the gas collection and destruction system during the fourth quarter 2017. The instantaneous total flow rate of LFG during December22, 2017 readings were 1,464 scfm at the Ameresco LFGEF and 2,643 scfm at the Forward flare station. An operational summary of the landfill gas collection and destruction system is presented in Attachment D. If you have any questions,please contact Mr.Joseph Lipka at(209)235-9622. Sincerely, Geo-Logic Associates William B. L�kll PG,CHG Senior Geologist cc: Joseph Lipka -Forward, Inc. Jessica Bernardini -Cornerstone Victoria Warren-Republic Services Project No.5017.1030 I Quarterly Progress Report-Fourth Quarter 2017 3