ARCHIVED REPORTS_2016_1 - Laserfiche WebLink

Home Browse Search

C 11 Quarterly Progress Report - First Quarter 2016 Austin Road Unit, Forward Landfill 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 January 1 through March 31, 2016. The system monitoring logs from Del -Tech for the first quarter 2016 are included in Attachment A. Del -Tech records indicate that the GTF experienced the following maintenance issues and/or periods of downtime during the first quarter 2016: • February 9, 2016: Del -Tech reported that the breakers were tripped for extraction wells EW - 311 and EW -4. Del -Tech reset the breakers and reported that both wells were operational. • February 29, 2016: Del -Tech reported that the breaker was tripped again for extraction well EW -3R. Del -Tech reported that the pump motor had failed for extraction well EW -3R and ordered a new pump motor. Based on analytical laboratory testing results from October 29, 2015, the influent to the groundwater treatment system contained 8.63 ug/L of VOCs. Based on totalizing flow meter readings from Del -Tech, an estimated 22.5 million gallons of extracted groundwater was treated during the first quarter 2016, yielding approximately 1.58 pounds of VOCs removed during this period. The GTF effluent results indicate that no VOCs were detected above their reporting limits during the first quarter 2016. The analytical results are presented in Attachment B. 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 volume), flow rate (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. Project No. 2016.0007 1 Quarterly Progress Report - First Quarter 2016 April 2016 2