ARCHIVED REPORTS_2008_22 - Laserfiche WebLink

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During the January inspection,methane exceeded the regulatory limit of five percent in perimeter soil-pore gas probe GP-9A at the Forward Unit. Minor adjustments were made to the LFG extraction system, and as a result, methane concentrations in this probe were reduced to 0.1 and 0.2 percent during the February and March inspections. Forward continues to install additional landfill gas extraction wells (as needed), and makes regular adjustments to the landfill gas extraction system to optimize efficiency of the landfill gas extraction system. Groundwater quality conditions beneath the Austin Unit during the first quarter 2008 monitoring period are generally similar to historical results. CLs were exceeded in detection monitoring program (DMP)wells AMW-6,AMW-7, AMW-13, and AMW-14, and with the exception of the barium concentration measured in well AMW-14 and the bicarbonate and cis-1,2-dichloroethene (cis-1,2-DCE) concentrations measured in well AMW-13,none of the CL exceedances exhibited statistically significant increasing trends. In the corrective action program (CAP)wells, trend analyses are performed instead of comparison to CLs. During the current monitoring period, one or more statistically significant increasing trends were noted for VOC constituents in wells AMW-1 and AMW-19, while decreasing VOC trends were noted in CAP wells AMW-10 and AMW-11. The increasing cis-1,2-DCE trends in well AMW-1 suggest that active reductive dechlorination is occurring in the vicinity of this well. According to the Forward Landfill Operations Manager, weekly standard observations have been conducted during the reporting quarter. The Forward Landfill Operations Manager also reported that no surface water was discharged during the reporting period. If you have any questions regarding this report, please call me at(858)451-1136. Sincerely, illiam B. Lopez C G, CHg Project Geologist Attachment C:X2007-0043TORW ARDLT&DOC -2- GeoLogic Associates