ARCHIVED REPORTS_2013_2 - Laserfiche WebLink

Home Browse Search

Leachate Monitoring According to the Operations Manager,no leachate was taken off site during the fourth quarter 2013. 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 2013. 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. The results of monthly field monitoring measurements and analytical results for the fourth quarter 2013 are presented in Table 3-5. As shown on Table 3-5, 11 dissolved metal constituents,eight VOCs, and one SVOC were detected in the leachate sample. No pesticides or herbicides were detected in the leachate sample collected during the fourth quarter 2013 monitoring period. Review of the annual 2013 leachate sample data indicates no new COCs were detected above PQLs, and therefore, no verification retesting is required. Groundwater Treatment Facility Operations The Groundwater Treatment Facility(GTF) at the Austin Unit has been operational since ® 1994 to mitigate impacts from landfill releases. Impacted groundwater is extracted from five wells (EW-1,EW-2,EW-3,EW-3R, and EW-4)that pump groundwater through an air stripper treatment system to remove VOCs. Treated groundwater is discharged to an infiltration pond(constructed in 2003)north of the Austin Road Unit of the Forward Landfill. Due to limited recharge in extraction well EW-3, the well was taken offline and replaced with extraction well EW-3R. To increase the volume of groundwater recovered in this area, well EW-3R was installed adjacent to and deeper than well EW-3. During the monitoring period, the GTF treated 24,339,700 gallons of groundwater at an average flow rate of 261,511 gallons per day. During the monitoring period,it is calculated that the GTF removed approximately 2.64 pounds of VOCs. 3.2 SUMMARY Groundwater quality conditions beneath the Austin Unit during the fourth quarter 2013 monitoring period were generally similar to historical results. During the current monitoring period, non-statistical exceedances for VOCs were identified at DMP wells AMW-6, AMW-13, and AMW-14. Trend analyses indicate that statistically significant increasing temporal trends were calculated for PCE and TCE in well AMW-13 and for PCE at well AMW-14. These results are similar to previous results and it has been recommended that wells AMW-6,AMW-13, and AMW-14 be re-designated as CAP wells since they have historically contained VOCs. For the routine inorganic monitoring parameters,CLs were exceeded for constituent concentrations in DMP wells AMW-12, AMW-13, and AMW-14. Trend analyses indicate that statistically significant increasing C:\2013-0021WA_4QUA. Geo-Logic Associates