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Ll Water Quality Monitoring Report Forward Landfill Verification sampling for the inorganic CL exceedances is scheduled for January 2017. For constituent concentrations in "Tracking Mode" an increasing trend was calculated for DIPE at well MW -16, and carbon tetrachloride and chloroform at well MW -17. Surface water stations were reported dry during the fourth quarter 2016 monitoring period. Vadose zone monitoring stations were also reported dry or had an insufficient volume of soil -pore liquid to sample. 3.0 AUSTIN UNIT 3.1 Water Quality Monitoring 3.1.1 Sampling and Laboratory Analyses Del -Tech performed routine monitoring of DMP, CAP, EMP wells at the Austin Unit during the fourth quarter 2016 monitoring period. Depth -to -water measurements were recorded in the groundwater monitoring wells on October 26, 2016. Groundwater and leachate sampling was performed between October 26, 2016 and November 7, 2016. During the monitoring period both surface water stations were reported dry. Samples were collected from each sample point with sufficient liquid and submitted to BC for analysis of the routine monitoring parameters stipulated in RWQCB Order No. 115-2014-0006. Table 2-1 presents the monitoring schedule and summarizes the analytical methods utilized during the current monitoring period. Wells AMW-1, AMW-7, AMW-10, and AMW-13 were also sampled for total arsenic, nitrogen, iron, and manganese for the CWLAM program. All water quality samples were analyzed in the field for ORP, turbidity, temperature, specific conductance, and pH and recorded on well data sheets. The groundwater monitoring wells, surface water monitoring locations, and leachate were sampled in accordance with the sampling and analysis plan detailed in Appendix E. The well data sheets, raw laboratory data, certificates of analyses, and chain -of -custody records related to the sampling program are included in Appendix F. Field and laboratory analyses are summarized in Tables 3-1 through 3-7 and cumulative tabulated data for all monitoring points and constituents for groundwater, unsaturated zone, leachate, and surface water are presented in Appendix F. 3.1.2 QA/QC Results The QA/QC program completed for the fourth quarter 2016 water quality monitoring event at the Austin Unit included analyses of five trip blanks, one field blank, laboratory method blanks, and one duplicate sample (well AMW-29). The field and trip blanks were analyzed for VOCs by EPA Method 8260 and method blanks were analyzed for all required analyses. The results of the QA/QC program indicate that no VOCs were detected in the trip, field, or method blanks. Calcium was measured at trace concentrations in two method blanks analyzed with groundwater samples. However, calcium was measured at very low concentrations that did not affect the interpretation of primary sample results. In addition, concentrations of acetone were measured in several wells (AMW-7, AMW-11, AMW-18, and AMW-19BR). These values were flagged as suspected laboratory contaminants since acetone is a common laboratory Project No. 2016.0007 1 Water Quality Monitoring Report 10 January 2017