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Water Quality Monitoring Report <br />Forward Landfill <br />is <br />K = Hydraulic conductivity of the water -bearing unit (0.04 cm/sec). <br />i = Hydraulic gradient: i = 0.004 at the site during the first quarter 2016. <br />ne= Effective porosity (ne = 0.35); an estimated value. <br />The maximum groundwater flow rate is calculated to be 1.296 feet/day (473 feet/year). <br />3.1.4 Detection Monitoring Program <br />Field and laboratory results for the Austin Unit DMP wells for the first quarter 2016 are <br />summarized in Table 3-1. <br />Non -Statistical Data Analysis <br />During the first quarter 2016 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 <br />release were identified at well AMW-6 as a result of a quantifiable concentrations of <br />PCE (2.2 µg/L), and a trace -level concentrations of DCDFM (0.42j µg/L) and <br />trichloroethene (TCE) (0.32j µg/L). Forward had previously requested that well AMW-6 <br />be reclassified as a CAP well, since similar concentrations have been historically <br />measured in this well. A trace -level concentrations of PCE was also measured in well <br />AMW-12. <br />Concentration Limit Thresholds <br />In accordance with RWQCB Order No. 115-2014-0006, the routine inorganic monitoring <br />data obtained from the Austin Unit DMP wells during the first quarter 2016 monitoring <br />period were compared to intrawell concentration limits (CLs) established for each well. <br />Details on the statistical analysis for the established CLs are presented in Appendix G of <br />the fourth quarter 2014 Water Quality Monitoring Report for the Forward Landfill (GLA, <br />2014. As summarized in Table 3-3, the following CLs were exceeded during the first <br />quarter 2016 monitoring period. <br />• AMW-5R — potassium <br />• AMW-6 — bicarbonate, calcium, magnesium, nitrate, potassium, strontium, and <br />TDS. <br />In a letter dated April 18, 2016, the RWQCB was notified of these CL exceedances and <br />retesting is scheduled for April 2015. Retesting will not be performed for well AMW-6 <br />since this well is a CAP well, mis-identified in the new WDR. <br />3.1.5 Corrective Action/Evaluation Program <br />M:\ 2016.0007\FA 1Q16.docx 11 <br />