ARCHIVED REPORTS_2011_14 - Laserfiche WebLink

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Leachate samples were collected on a monthly basis and analyzed in the field for pH, specific conductance, and temperature.. In addition,to monthly monitoring, leachate is sampled annually during the fourth quarter monitoring period for the parameters listed in Table 2-1. Results of monthly field monitoring measurements, and analytical results for the fourth quarter 2011 are presented in Table 2-6. As shown on Table 2-6, eight dissolved metal constituents were detected, and two VOCs were detected(with one measured above its PQL). No semi-volatile organic compounds (SVOCs), herbicides, or pesticides were detected in the annual leachate sample. The results of the annual leachate sample indicate that there were no new COCs detected above the PQL, and as a result, verification testing is not required. 2.1.7 Surface Water Monitoring Site run-on and run-off control facilities are designed to effectively channel surface water to site stormwater/sedimentation ponds. According to the Operations Manager, there were no discharges to surface water during the reporting quarter. During the fourth quarter 2011 monitoring period, both surface-water monitoring stations FS W-1 and FSW-2 were reported dry by Del-Tech on November 2, 2011. 2.2 SUMMARY Groundwater quality conditions beneath the Forward Unit during the fourth quarter 2011 monitoring period are generally similar to those observed in previous monitoring periods. During the fourth quarter 2011 monitoring period, DIPS was measured above its PQL in the sample collected from well MW-16. In addition, the following VOCs were measured at estimated trace concentrations, DIPE in the sample collected from well MW-2A; acetone and DCDFM in the sample collected from well MW-10; and 1,1-DCA, cis-1,2- DCE, DCDFM, PCE, TCE, and TCFM in the samples collected from well MW-14. CLs were exceeded for one or more constituents in wells MW-10, MW-15, MW-16, and MW- 22. Excluding non-impact constituents and VOCs, confirmation sampling will be performed in February 2012 during the first quarter 2012 monitoring event, and in March 2012. The results of the confirmation sampling will be provided under separate cover. The fourth quarter 2011 leachate monitoring results are generally similar to those observed historically. During the monitoring period, eight dissolved metal constituents were detected and two VOCs were detected (with one VOC measured above its PQL). No SVOCs, herbicides, or pesticides were detected in the annual leachate sample. The results from the annual leachate sample indicate that there were no new COCs detected. c:\zon-0050\Fn_aQILdoc 7 Geo-Logic Associates