ARCHIVED REPORTS_2014_2 - Laserfiche WebLink

Home Browse Search

Water Quality Monitoring Report Forward Landfill Value Engineering conducted a continuity test of the leachate collection and removal system (LCRS) on August 22 and 23, 2014 at the Forward Unit. The tracer dye test results indicate that continuity is present across the LCRS units WMU-F North, and no excessive leachate is backed up in the drainage layer or sump of the LCRS units. 4.5 Austin Unit 4.5.1 Groundwater Groundwater elevations measured during the 2014 monitoring year generally reflect seasonal precipitation patterns. Hydrographs depicting historical groundwater elevations are presented in Appendix G and indicate generally static trends. During the 2014 monitoring year groundwater flow was generally directed to the north and northeast at a gradient between 0.001 ft/ft to 0.003 ft/ft with a slight groundwater mound in the vicinity of the GTF infiltration pond north of the Austin Road Unit. Groundwater quality conditions beneath the Austin Unit during the 2014 monitoring year are generally similar to those observed in the previous monitoring year. The following table summarizes inorganic CL exceedances for DMP wells during the 2014 monitoring year. Austin Unit CL Exceedances for 2014 Monitoring Year 0 Inorganic Constituents Well Constituent 2014 Monitoring Period(s) CL was Exceeded AMW-6 Bicarbonate 3r AMW-7 Calcium ISt & 3r Although CL exceedances were noted for wells AMW-6 and AMW-7, none of the CL exceedances were consistently exceeded over the 2014 monitoring year. In addition, one or more VOCs were consistently detected at quantifiable concentrations in well AMW-6. No other VOCs were detected in DMP wells over the 2014 monitoring year. It should be noted, however, this well was misidentified as a DMP well in the new WDR and Forward has requested that well AMW-6 be reclassified as a CAP well.. In the CAP/EMP wells, 17 of 28 CAP/EMP wells reported one or more VOCs exceeding a PQL during the 2014 monitoring year, with CAP well AMW-1 having the greatest number of VOCs. An annual report discussing the CAP and EMP monitoring results including a comprehensive discussion of any corrective actions taken or planned was prepared by Herst & Associates (Herst, 2014) and is included in Appendix H. In response to continued detection of VOCs in groundwater downgradient of the Austin Road Unit, the RWQCB issued a CAO on December 8, 2008. Forward has installed 19 additional M:\ 2014.0012\FA_4Q14.docx 17 1/28/2015, Rev. 0