ARCHIVED REPORTS_2006_2 - Laserfiche WebLink

Home Browse Search

® was inspected and vacuums were reset to approximately —23 to —26 inches of mercury on December 1, 2006. On December 21, 2006, the lysimeters were again checked and positive pressure was applied to evacuate the accumulated sample. As recorded in the field notes for lysimeters (Appendix C) and summarized on Table 2-5, lysimeters W-1, LY -A, LY-BG1, and FU -03-1 had a sufficient volume of soil -pore liquid for sample collection. However, due to the limited sample volumes, lysimeter samples were only analyzed for VOCs and the results are summarized on Table 2-6. As shown in Table 2-6, 10 VOCs were measured in the lysimeters samples collected during the fourth quarter 2006 monitoring period. 2.1.6 Surface Water Monitoring Site run-on and run-off control facilities are designed to effectively channel surface water to lined holding and evaporation ponds on site. According to the Operations Manager, no surface water was discharged from the facility during the reporting quarter. During the fourth quarter 2006 monitoring period surface water stations FSW-1 and FSW-2 were not sampled because both surface water stations were dry. 2.1.7 Leachate Monitoring Leachate sumps are inspected for the presence of leachate and observations are recorded at least weekly by Forward Landfill personnel. If leachate is detected in a sump, it is pumped into the surface impoundment (WMU F) for evaporation. During the fourth quarter 2006, leachate was only observed at holding areas WMU-D02, WMU-FU03, WMU-FU04, and WMW-FU05. The other holding areas were reported to be dry by Forward Landfill personnel. Freeboard at WMU F ranged from approximately 6.33 feet to 7.67 feet during the fourth quarter 2006 monitoring period. Appendix A presents copies of the leachate logs and the freeboard observation logs. Leachate samples were collected for the leachate pond on a monthly basis and analyzed in the field for pH and specific conductance. In addition to monthly monitoring, the 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 2006 are presented in Table 2-7. As shown on Table 2-7, nine dissolved metal constituents were measured with seven above the PQL; 12 VOCs were measured with 10 above the PQL; and four SVOCs were measured with three above the PQL in the leachate sample collected during the fourth quarter 2006 monitoring period. No pesticides or herbicides were detected. Review of the November 2006 leachate sample data indicates that of the constituents detected, only sulfide and 3-&-4-Methylphenol are potential new constituents of concern (COCs). Therefore, in accordance with WDR No. R5-2003-0049, verification samples will be collected from the Forward leachate sample point in February 2007 and reported with the first quarter 2007 monitoring report. Value Engineering conducted a gas test of the leachate collection and removal system (LCRS) on August 10, 2006 at the Forward Unit. The test results indicate that an open- D A2003_02t1ForwardAustin_106.doc\ 7 Geologic Associates