ARCHIVED REPORTS_2010_20 - Laserfiche WebLink

Home Browse Search

3.1.6 Domestic Well Monitoring Two domestic wells (7898-A and 8106-A) were sampled on November 18, 2010. Table 3-3 summarizes the current analytical results for the domestic well samples collected. In the sample collected from well 7898-A, PCE was measured above the PQL, while in the sample collected from well 8106-A, DCDFM,PCE, and TCE were measured above their respective PQLs. 3.1.7 Surface Water Monitoring Surface-water sampling was conducted on November 17, 2010 and the results are summarized on Table 3-5. During the fourth quarter 2010 monitoring event, only upstream surface water monitoring station ASW-1 had sufficient water to collect a sample, while downstream surface-water monitoring station ASW-2 was reported dry. As shown on Table 3-5, no VOCs were detected in the sample collected from surface water monitoring station ASW-1. The inorganic analytical results appear to be similar to the historical results and no statistically significant increasing trends were noted for the sample collected during the fourth quarter 2010 monitoring period(Appendix D). 3.1.8 Leachate Monitoring According to the Operations Manager, no leachate was taken off site during the fourth quarter 2010. The leachate collection system, which collects leachate from the north face of the landfill, has been operational since November 1996. WQPS (concentration limits) are not required for leachate because it is collected and removed for disposal,rather than discharged. According to the Operations Manager, the LCRS operated effectively during the fourth quarter 2010. Leachate samples were collected from the pond on a monthly basis and analyzed in the field for pH, specific conductance, and temperature. 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 2010 are presented in Table 3-6. As shown on Table 3-6, 12 dissolved metal constituents were detected with seven measured above the PQL; three VOCs were detected above the PQL; and two trace level SVOCs were detected. No pesticides or herbicides were detected in the leachate sample collected during the fourth quarter 2010 monitoring period. Review of the annual 2010 leachate sample data indicates no new COCs were detected above the PQL, and therefore, no retesting is required. 3.1.9 Groundwater Treatment Facility Operations The Groundwater Treatment Facility(GTF) at the Austin Unit has been operational since 1994 to mitigate impacts from landfill releases. Currently, impacted groundwater is extracted from four wells (EW-1, EW-2, EW-3R, and EW-4), treated, and discharged to D:\2010_0013\FA_4Q10.doc 13 Geologic Associates