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Quarterly Progress Report - Third quarter 2016 Austin Road Unit, Forward Landfill Remediation System Operations and Performance Evaluation of Individual Extraction Points CAO Task 6.a indicates that Quarterly Progress Reports shall include information on remedial system operation and performance during the relevant quarter. The CAO does not provide a definition of the term "remedial system". Forward, Inc. interprets the term to include the groundwater extraction and treatment system, along with the landfill gas collection and destruction system. Landfill gas collection and destruction provides source control. The Groundwater Treatment Facility (GTF) provides remediation to impacted groundwater. Information relevant to each of the remediation systems is provided below. As described in the CAO, the evaluation of individual extraction points applies to both groundwater and landfill gas extraction points. Groundwater Extraction and Treatment System The GTF includes four groundwater extraction wells (EW -1, EW -2, EW -3R and EW -4), an above- ground air stripper system, and an infiltration basin located north of the landfill. Each of these components was previously approved by the RWQCB. Del -Tech Geotechnical Support Services, Inc. (Del -Tech) performed operations and maintenance on the GTF during the period of October 1 through December 31, 2016. The system monitoring logs from Del -Tech for the fourth quarter 2016 are included in Attachment A. Del -Tech records indicate that the groundwater extraction and treatment system experienced the following maintenance issues and periods of downtime during the fourth quarter 2016: November 18, 2016: De , be found. Del -Tech reset the breaker. Based on analytical laboratory testing results from October 31, 2016, the influent to the groundwater treatment system contained 6.35 µg/L of VOCs. Based on totalizing flow meter readings from Del -Tech, an estimated 19.4 million gallons of extracted groundwater was treated during the fourth quarter 2016, yielding approximately 0.85 pounds of VOCs removed during this period. Trace concentrations of 1,4 -dichlorobenzene, tetra chloroethene, and trichloroethene were measured in the monthly effluent samples. In addition, cis-1,2-dichloroethene was measured above the PQL during each sampling event. Total VOC concentrations in the effluent were 1.10 µg/L in October, 1.15 µg/L in November, and 1.00 µg/L in December. Landfill Gas Collection and Destruction System The landfill gas collection and destruction system servicing the Austin Road Unit at the Forward Landfill consists of 107 landfill gas extraction wells, according to the 2015 GCCS Improvements Plans prepared by Cornerstone Environmental. Collected landfill gas is routed to 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 Project No. 2016.0007 1 Quarterly Progress Report - Fourth Quarter 2016 2