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Water Quality Monitoring Report <br /> Forward Landfill <br /> Non-Statistical Data Analysis <br /> During the fourth quarter 2017 monitoring period, the CNSDAM was performed for VOCs <br /> detected in the DMP wells. As shown in Table 3-1, non-statistical indications of a release were <br /> identified at wells AMW-6 and AMW-12 as a result of quantifiable concentrations of PCE. In <br /> addition, trace concentrations of DCDFM and TCE were detected in well AMW-6. In a letter <br /> dated January 30, 2018, the RWQCB was notified of the CL exceedances in wells AMW-6 and <br /> AMW-12. Quantifiable VOCs were placed in "Tracking Mode" and are being evaluated <br /> quarterly for temporal trends (see below). <br /> Concentration Limit Thresholds <br /> In accordance with RWQCB Order No. 115-2014-0006, the routine inorganic monitoring data <br /> obtained from the Austin Unit DMP wells during the fourth quarter 2017 monitoring period <br /> were compared to intrawell concentration limits (CLs) established for each well. Updated CLs <br /> were calculated for the Austin Unit DMP. Details on the statistical analysis performed to <br /> determine the CLs presented in Table 3-3 are presented in Appendix G. As summarized in Table <br /> 3-3,the following CLs were exceeded during the fourth quarter 2017 monitoring period. <br /> • AMW-SR—bicarbonate, calcium <br /> • AMW-12—nitrate-N <br /> Tracking Mode <br /> Constituent concentrations reported above a CL within the previous three years of monitoring <br /> were placed in "Tracking Mode" and are evaluated for temporal trends using Mann-Kendall <br /> trend analyses. The results of the trend analyses indicate that increasing trends were <br /> calculated for calcium at well AMW-511 and PCE at well AMW-12 (Table 2-5). Mann-Kendall <br /> trend analyses calculations are presented in Appendix G. <br /> 3.1.5 Corrective Action/Evaluation Program <br /> Field and laboratory results for CAP and EMP wells for the fourth quarter 2017 monitoring <br /> period are summarized in Table 3-2. Excluding suspected laboratory contaminants, 18 of 29 <br /> CAP/EMP wells reported one or more VOCs exceeding a Practical Quantitation Limit (PQL), with <br /> CAP well AMW-1 and AMW-22S having the greatest number and total concentrations of VOCs. <br /> An annual report discussing the CAP and EMP monitoring results for the Austin Unit was <br /> prepared by Geo-Logic Associates (GLA, 2017) and is included in Appendix H. <br /> 3.1.6 Cannery Waste Land Application Monitoring <br /> Field and laboratory results for CWLAM wells for the fourth quarter 2017 monitoring period are <br /> summarized in Table 3-4 and were compared to Water Quality Protection Standards (WQPS) <br /> calculated for CWLAM constituents (total nitrogen, arsenic, iron, and manganese). Updated WQPS <br /> were calculated for the CWLAM wells. Details on the statistical analysis performed to <br /> Project No.5017.1030 I Water Quality Monitoring Report 11 <br /> January 2018 <br />