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Water Quality Monitoring Report <br />Forward Landfill <br />3.1.4 Detection Monitoring Program <br />Field and laboratory results for the Austin Unit DMP wells for the fourth quarter 2015 <br />are summarized in Table 3-1. <br />Non -Statistical Data Analysis <br />During the fourth quarter 2015 monitoring period, the CNSDAM was performed for <br />VOCs detected in the DMP wells. As shown in Table 3-1, non -statistical indications of a <br />release were identified at well AMW-6 as a result of a quantifiable concentration of <br />dichlorodifluoromethane (DCDFM), tetrachloroethene (PCE), and a trace -level <br />concentration of trichloroethene (TCE). Forward had previously requested that well <br />AMW-6 be reclassified as a CAP well, since similar concentrations have been historically <br />measured in this well. With the exception of a trace concentration of PCE measured in <br />well AMW-12, no other VOCs detected in DMP wells for the Austin Unit. <br />Concentration Limit Thresholds <br />Cl <br />In accordance with RQCB Order No. R5-2014-0006, the routine inorganic monitoring <br />data obtained from the Austin Unit DMP wells during the fourth quarter 2015 <br />monitoring period were compared to intrawell concentration limits (CLs) established for <br />each well. Details on the statistical analysis for the established CLS are presented in 1 <br />Appendix G of the fourth quarter 2014 Water Quality Monitoring Report for the <br />Forward Landfill (GLA,2014). As summarized in Table 3-3, the following CLs were <br />exceeded during the fourth quarter 2015 monitoring period. <br />• AMW-6 — bicarbonate alkalinity, calcium, magnesium, potassium, and strontium. <br />Retesting will not be performed for well AMW-6 since this well is a CAP well, mis- <br />identified in the most recent WDR. <br />3.1.5 Corrective Action/Evaluation Program <br />Field and laboratory results for CAP and EMP wells for the fourth quarter 2015 <br />monitoring period are summarized in Table 3-2. As shown in Table 3-2, 16 of 28 <br />CAP/EMP wells reported one or more VOCs exceeding a Practical Quantitation Limit <br />(PQL), with CAP well AMW-1 having the greatest number of VOCs (13) including 10 <br />measured above a PQL. An annual report discussing the CAP and EMP monitoring <br />results for the Austin Unit was prepared by Herst & Associates (Herst, 2015) and is <br />included in Appendix H. <br />M:\ 2015.0014\FA 4Q15.docx 12 <br />1/29/2016, Rev. 0 <br />