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Quarterly Progress Report-Third quarter 2016 <br /> Austin Road Unit,Forward Landfill <br /> Remediation System Operations and Performance Evaluation of Individual Extraction Points <br /> CAO Task 6.a indicates that Quarterly Progress Reports shall include information on remedial <br /> system operation and performance during the relevant quarter. The CAO does not provide a <br /> definition of the term "remedial system". Forward, Inc. interprets the term to include the <br /> groundwater extraction and treatment system, along with the landfill gas collection and destruction <br /> system. Landfill gas collection and destruction provides source control.The Groundwater Treatment <br /> Facility (GTF) provides remediation to impacted groundwater. Information relevant to each of the <br /> remediation systems is provided below. As described in the CAO, the evaluation of individual <br /> ' extraction points applies to both groundwater and landfill gas extraction points. <br /> Groundwater Extraction and Treatment System <br /> ' The GTF includes four groundwater extraction wells (EW-1, EW-2, EW-311 and EW-4), an above- <br /> ground air stripper system, and an infiltration basin located north of the landfill. Each of these <br /> components was previously approved by the RWQCB. <br /> tDel-Tech Geotechnical Support Services, Inc. (Del-Tech) performed operations and maintenance on <br /> the GTF during the period of October 1 through December 31, 2016. The system monitoring logs <br /> from Del-Tech for the fourth quarter 2016 are included in Attachment A. <br /> Del-Tech records indicate that the groundwater extraction and treatment system experienced the <br /> following maintenance issues and periods of downtime during the fourth quarter 2016: <br /> • November 18, 2016: Del-Tech reported that the main breaker had tripped, no reason could <br /> be found. Del-Tech reset the breaker. <br /> Based on analytical laboratory testing results from October 31, 2016, the influent to the <br /> groundwater treatment system contained 6.35 µg/L of VOCs. Based on totalizing flow meter <br /> readings from Del-Tech, an estimated 19.4 million gallons of extracted groundwater was treated <br /> during the fourth quarter 2016, yielding approximately 0.85 pounds of VOCs removed during this <br /> period. <br /> Trace concentrations of 1,4-dichlorobenzene, tetrachloroethene, and trichloroethene were <br /> measured in the monthly effluent samples. In addition, cis-1,2-dichloroethene was measured <br /> above the PQL during each sampling event. Total VOC concentrations in the effluent were 1.10 <br /> µg/L in October, 1.15 µg/L in November, and 1.00µg/L in December. <br /> Landfill Gas Collection and Destruction System <br /> The landfill gas collection and destruction system servicing the Austin Road Unit at the Forward <br /> Landfill consists of 107 landfill gas extraction wells,according to the 2015 GCCS Improvements Plans <br /> prepared by Cornerstone Environmental. Collected landfill gas is routed to Flare A-2 for thermal <br /> destruction,with Flare A-1 serving as a back-up flare. On a weekly basis SCS Field Services, Inc. (SCS) <br /> records information such as methane gas concentration (percent by volume), oxygen concentration <br /> (percent by volume), carbon dioxide concentration (percent by volume), balance gas (percent by <br /> Project No.2016.0007 1 Quarterly Progress Report-Fourth Quarter 2016 <br /> 2 <br />