Laserfiche WebLink
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 first <br /> quarter 2011, leachate was observed at all of the holding areas except WMU D-87 and <br /> VVMU D-88 A/B. Freeboard at WMU-F ranged from approximately 5.58 to 11.08 feet <br /> during the first quarter 2011 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 first quarter 2011 are presented in Table 2-6. <br /> 2.1.7 Surface Water Monitoring <br /> Site run-on and run-off control facilities are designed to effectively channel surface water <br /> to site storinwater/sedimentation ponds. According to the Operations Manager,there <br /> were no discharges to surface water during the reporting quarter. During the first quarter <br /> 2011 monitoring period, surface-water monitoring stations FSW-1 and FSW-2 were <br /> sampled on February 24, 2011. Table 2-7 summarizes the current analytical results of <br /> surface water samples collected at the Forward Unit. As shown on Table 2-7, no VOCs <br /> were detected in the surface water samples collected during the monitoring period. A <br /> comparison of upgradient(FSW-2)to downgradient(FSW-1) surface water samples <br /> indicates generally similar inorganic constituent concentrations suggesting that the <br /> landfill operation are not impacting surface water quality. <br /> 2.2 SUMMARY <br /> Groundwater quality conditions beneath the Forward Unit during the first quarter 2011 <br /> monitoring period are generally similar to those observed in previous monitoring periods. <br /> During the first quarter 2011 monitoring period, five new historical intrawell maximum <br /> values were measured in samples collected from groundwater monitoring wells. The <br /> organic results for the Forward Unit indicate that isopropyl ether was measured at a trace <br /> concentration in the sample collected from well MW-2A; PCE was measured at a trace <br /> concentration in the sample collected from well MW-14; and acetone was measured at a <br /> trace concentration in the sample collected from well MW-16. CLs were exceeded for <br /> sulfate at wells MW-10, MW-13, MW-15,MW-18, and MW-22; and for hexavalent <br /> chromium at background well MW-23R. However,both analytes are classified as non- <br /> impact constituents and no retesting is required. <br /> During the March 2011 inspection, the CEHD measured methane concentrations <br /> exceeding the regulatory limit of five percent in perimeter soil-pore gas probe GP-9 <br /> during the March 2011 CEHD inspection. In response to elevated methane <br /> concentrations measured in this probe,Forward has made adjustments to the LFG <br /> extraction wells to reduce landfill gas near GP-9. <br /> D:U01 1_0050\FA_1Q1 Ldocx 7 Geologic Associates <br />