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C <br />C] <br />Water Quality Monitoring Report <br />Forward Landfill <br />3.1.11 Corrective Action Monitoring <br />The Groundwater Treatment Facility (GTF) at the Austin Unit has been operational since <br />1994 to mitigate impacts from landfill releases. Impacted groundwater is extracted <br />from four wells (EW -1, EW -2, EW -3R, and EW -4) that pump groundwater through an air <br />stripper treatment system to remove VOCs. Treated groundwater is discharged to an <br />infiltration pond (constructed in 2003) north of the Austin Road Unit of the Forward <br />Landfill. During the monitoring period, the GTF treated 25.0 million gallons of <br />groundwater and removed approximately 1.20 pounds of VOCs. Details regarding <br />corrective action remediation system operations and performance evaluation for the <br />second quarter 2016 are presented in Appendix C. <br />3.2 Summary <br />Groundwater quality conditions beneath the Austin Unit during the second quarter 2016 <br />monitoring period were generally similar to historical results. With the exception of well <br />AMW-6, one CL was exceeded for nitrate as nitrogen in DMP well AMW-12. In addition, <br />the WQPS for iron was exceeded at well AMW-10. Verification sampling for the <br />exceedances at wells AMW-10 and AMW-12 is scheduled for July 2016. Although, <br />several CLs were exceeded and several VOCs were detected in well AMW-6, it is <br />recognized that well AMW-6 should have been identified a CAP well in the M&RP. For <br />the CAP/evaluation wells, 16 of 28 wells reported one or more VOCs exceeding a PQL, <br />with CAP well AMW-1 having the greatest number of VOCs (14), including 10 measured <br />above a PQL. For surface water, toluene was detected at a quantifiable concentration at <br />background surface water monitoring station ASW -1. No other CL exceedances were <br />noted for during the second quarter 2016 monitoring period. Since surface water <br />station ASW -1 is currently dry, verification sampling will be performed during the next <br />sampling event when flow is reported at ASW -1. For the vadose zone, seven VOCs were <br />measured in the sample collected from suction lysimeter FU -05, all of the other <br />lysimeters were reported dry during the second quarter 2016 monitoring period. Under <br />the existing CAP, the GTF pumped 25.0 million gallons of groundwater removing an <br />estimated 1.20 pounds of VOCs. <br />M:\ 2016.0007\FA 2Q16.docx 14 <br />