ARCHIVED REPORTS_2015_3 - Laserfiche WebLink

Home Browse Search

Water Quality Monitoring Report Forward Landfill 3.1.11 Corrective Action Monitoring The Groundwater Treatment Facility (GTF) at the Austin Unit has been operational since 1994 to mitigate impacts from landfill releases. Impacted groundwater is extracted from four wells (EW-1, EW-2, EW-3R, and EW-4) that pump groundwater through an air stripper treatment system to remove VOCs. Treated groundwater is discharged to an infiltration pond (constructed in 2003) north of the Austin Road Unit of the Forward Landfill. During the monitoring period, Herst and Associates (2014) calculated that the GTF treated 22.7 million gallons of groundwater and removed approximately 1.13 pounds of VOCs. Details regarding corrective action remediation system operations and performance evaluation for the first quarter 2015 are presented in Appendix C. 3.2 Summary Groundwater quality conditions beneath the Austin Unit during the first quarter 2015 monitoring period were generally similar to historical results. During the current monitoring period, although it is recognized that well AMW-6 is a CAP well mis- identified as a DMP well, three inorganic CLs were exceeded and a non-statistical indication of release was identified at well AMW-6. No other VOCs were detected in DMP wells. For the CAP/evaluation wells, 17 of 28wells reported one or more VOCs exceeding a PQL, with CAP well AMW-1 having the greatest number of VOCs (14), including eight measured above a PQL. Surface water samples collected from the upstream and downstream surface water monitoring stations during the first quarter 2015 monitoring period are generally consistent with each other and no VOCs were detected. With the exception of FU-04W all of the lysimeters were reported dry. However,there was insufficient soil pore liquid from FU-04W for analysis. Under the existing CAP, the GTF pumped 22.7 million gallons of groundwater removing an estimated 1.13 pounds of VOCs. M:\2015.0014\FA 1Q15.docx 13 4/27/2015,Rev.0