ARCHIVED REPORTS_2014 - Laserfiche WebLink

Home Browse Search

Water Quality Monitoring Report Forward Landfill collected during the 2014 monitoring period. Of note, pan lysimeters WMW-D01N, WMW-D01S, and WMW-D02 were not equipped with access ports. Forward is currently working on installing access ports for these pan lysimeters and the results of pan lysimeter monitoring at these locations will be included in the third quarter 2014 monitoring report. 2.1.6 Leachate/Surface Impoundment Monitoring For the Forward Unit, leachate sumps and surface impoundments are inspected weekly by Forward Landfill personnel. If leachate is detected in a sump, it is pumped into the surface impoundment WMU F (North)for evaporation. During the second quarter 2014, leachate was observed at holding areas WMU D-89, WMU D-93/94, WMU D-04 N/S, and WMU D-02 and a total of 23,900 gallons of leachate was removed from the lined areas at an average rate of 263 gallons per day. For surface impoundment WMU-F (North), freeboard ranged from approximately 10.09 to 9.54 feet during the second quarter 2014 monitoring period. Appendix A presents copies of the leachate observation logs, freeboard observation logs, and dissolved oxygen measurements. Leachate samples are analyzed in the field for pH, specific conductance, temperature, and turbidity on a quarterly basis. Results of quarterly field monitoring measurements for the second quarter 2014 are presented in Table 2-6. 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 from the Forward Unit to surface water (waters of the United States) during the reporting period. Surface water monitoring stations FSW-1 (downstream) and FSW-2 (upstream) were reported dry on April 16, 2014 during the second quarter 2014 monitoring period. As a result, no samples were collected. 2.2 Summary Groundwater quality conditions beneath the Forward Unit during the second quarter 2014 monitoring period are generally similar to those observed in previous monitoring periods. Excluding carbon dioxide, which was flagged as a field/laboratory contaminant, only one VOC (DIPS) was measured at an estimated-trace concentration at well MW-2A. No other VOCs were detected in groundwater samples during the second quarter 2014 monitoring period. For the inorganic monitoring parameters, CLs were exceeded for pH value at wells MW-3 and MW-23R; for nitrate at well MW-14: and for TDS at well MW- 17. However, no statistically significant increasing temporal trends are associated with well/constituent pairs that exceeded a CL. The inorganic CL exceedances for wells MW- 3 and MW-14 may be associated with the groundwater gradient reversal in the northeast corner of the landfill beginning in 2011, while the CL exceedance for well MW- M:\2014.0012\FA_2Q14rev.docx 8 9/5/2014,Rev.1