Laserfiche WebLink
New Historical Intrawell Maximum Values <br /> Well Analyte New Value Previous Value <br /> MW-24 Magnesium 56 m L 55.7 m L <br /> Sulfate 140 m L 135 m L <br /> Concentration Limit Thresholds <br /> Data obtained during the second quarter 2012 monitoring period were compared to <br /> concentration limits (CLs) as specified in the RPCMP for the Forward Landfill. CLs <br /> were calculated by Herst&Associates and are included in Appendix D. Table 2-4 <br /> summarizes CLs that were exceeded in samples collected from groundwater monitoring <br /> wells during the second quarter 2012. As summarized in this table, CLs were exceeded <br /> for RIPE at wells MW-2A and MW-16, chloride at well MW-13,barium at well MW-14, <br /> sulfate at well MW-15. CL exceedances for non-impact constituents (arsenic, <br /> bicarbonate, hexavalent chromium, nitrate as nitrogen, and sulfate)are not retested. In <br /> addition, CL exceedances for low-level VOCs are not retested since similar low-level <br /> VOCs have been confirmed at the Forward Unit. Therefore, only the CL exceedance for <br /> chloride at well MW-13 and barium at well MW-14 will require retesting. <br /> 2.1.5 Vadose Zone Monitoring <br /> The current vadose-zone monitoring network at the Forward Unit consists of 17 <br /> lysimeters. The lysimeter locations are shown on Figure 2-1. Each accessible lysimeter <br /> was inspected and vacuums were reset to approximately—25 inches of mercury on May <br /> 4, 2012. On May 7, 2012,the lysimeters were again checked and positive pressure was <br /> applied to evacuate the accumulated sample. As recorded in the field notes for lysimeters <br /> (Appendix C) and summarized on Table 2-5, lysimeters were reported dry to moist, and <br /> as a result, no soil-pore liquid samples were collected during the current monitoring <br /> period. <br /> 2.1.6 Leachate Monitoring <br /> Leachate sumps are inspected for the presence of leachate and observations are recorded <br /> at least weekly by Forward Landfill personnel. If leachate is detected in a sump, it is <br /> pumped into the surface impoundment(WMU F) for evaporation. During the second <br /> quarter 2012, leachate was observed at all of the holding areas except WMU D-87 and <br /> WMU D-88 AB. Freeboard at WMU-F ranged from approximately 5.17 to 10.50 feet <br /> during the second quarter 2012 monitoring period. Appendix A presents copies of the <br /> leachate logs and the freeboard observation logs. <br /> Leachate samples were collected on a monthly basis and analyzed in the field for pH, <br /> specific conductance, and temperature. Results of monthly field monitoring <br /> measurements for the second quarter 2012 are presented in Table 2-6. <br /> c:UOI2-0025TA_2QI2.aoc 6 Geo-Logic Associates <br />