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Water Quality Monitoring Report <br /> Forward Landfill <br /> V = Kt = (255 - �* 0.002 = 1.46 ft/day <br /> ne day 0.35 <br /> where: V=Groundwater flow velocity. <br /> K=Hydraulic conductivity of the water-bearing unit(255 ft/day). <br /> i=Average hydraulic gradient:i=0.002 during the third quarter 2017. <br /> ne=Effective porosity(ne=0.35);an estimated value. <br /> The estimated groundwater flow rate is calculated to be 1.46 feet/day(532 feet/year). <br /> 3.1.4 Detection Monitoring Program <br /> Field and laboratory results for the Austin Unit DMP wells for the third quarter 2017 are <br /> summarized in Table 3-1. <br /> Non-Statistical Data Analysis <br /> During the third 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 also detected in well AMW-6. In a <br /> letter dated October 17, 2017, the RWQCB was notified of the CL exceedances in wells AMW-6 <br /> and 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. R5-2014-0006, the routine inorganic monitoring data <br /> obtained from the Austin Unit DMP wells during the third quarter 2017 monitoring period were <br /> compared to intrawell concentration limits (CLs) established for each well. Details on the <br /> statistical analysis for the established CLs are presented in Appendix G of the fourth quarter <br /> 2014 Water Quality Monitoring Report for the Forward Landfill (GLA, 2014). As summarized in <br /> Table 3-3, the following inorganic CLs were exceeded during the third quarter 2017 monitoring <br /> period. <br /> • AMW-6—bicarbonate, calcium, strontium <br /> • AMW-12—potassium <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 an increasing trend was <br /> Project No.SO17.1030 I Water Quality Monitoring Report 11 <br /> October 2017 <br />