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2017 Corrective Action Evaluation Report-Austin Road Unit Forward Landfill On behalf of Forward, Inc. (Forward) and in accordance with Section B.5 of the February 14, 2014 Monitoring and Reporting Program (M&RP) 115-2014-0006, Geo-Logic Associates (GLA) is submitting this Annual Corrective Action Evaluation Report for the Austin Road Unit (ARU) of the Forward Landfill. On February 26, 2002, Forward, Inc. submitted the Evaluation Procedures for Proposed Corrective Action at Austin Road Landfill, Addendum to May 2001 EFS (Revised August 2001) (hereafter, Evaluation Procedures Report). This report described procedures for evaluating the effectiveness of groundwater corrective action measures at the ARU. The California Regional Water Quality Control Board (RWQCB) later incorporated these procedures into Section B.5 of the M&RP. Corrective action measures implemented to date at the ARU include landfill gas management, groundwater pumping, and an artificial groundwater recharge area. Landfill gas collection began in 1985. Groundwater pumping at extraction wells EW-1 and EW-2 has been underway since 1994; groundwater pumping at extraction well EW-4 has been underway since May 2009; and groundwater pumping at extraction well EW-3R has been underway since October 2009. The artificial recharge area was constructed in October 2002 and has reportedly been in use since May 2003. The Evaluation Procedures Report specifies three criteria that shall be used for evaluating groundwater corrective action measures at the ARU. Any of the following shall constitute an exceedance: An exceedance of the total volatile organic compound (TVOC) mass Threshold Limit (TL); An increase in TVOC mass for four consecutive monitoring events; or • An exceedance of any of the individual well TVOC concentration TLs. The Evaluation Procedures Report specifies a TL for TVOC mass that is derived from modeling data using historical groundwater monitoring data. The TVOC mass TL therefore represents a historical upper bound of TVOC mass in impacted groundwater. An exceedance of the TVOC mass TL or four consecutive increases in TVOC mass would be suggestive of potential increasing VOC concentrations on a plume-wide basis. Similarly, the Evaluation Procedure Report also specifies TLs for TVOC concentrations at individual corrective action monitoring wells. An exceedance of a TVOC concentration TL would be suggestive of potential increasing VOC concentrations at that particular well. The TVOC mass TL and individual well TVOC concentration TLs are summarized on Table 1. In order to evaluate the effectiveness of corrective action at the ARU, this 2017 Annual Corrective Action Evaluation Report evaluates groundwater monitoring results from the third quarter 2016, fourth quarter 2016, first quarter 2017, and second quarter 2017 (monitoring period), using the criteria listed above. Furthermore, analytical data from 18 additional Project No.5017.1030 1 2017 Corrective Action Evaluation Report-Austin Road Unit 1 Forward Landfill