ARCHIVED REPORTS_2006_1 - Laserfiche WebLink

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concluded that the inorganic CL exceedances are likely the result of naturally occurring conditions and therefore not indicative of a release from the Forward Landfill. Methane was measured at concentrations up to 33 percent in probe GP-12 during the second quarter 2006. In response to elevated methane concentrations,Forward is currently installing additional landfill gas extraction wells, and working to optimize the efficiency of the landfill gas extraction system. Methane concentrations less than 3.5 percent were measured in June 2006, suggesting that the landfill gas extraction system is effectively reducing methane concentrations in perimeter probes at the Forward Landfill. For the Austin Unit,during the second quarter 2006 monitoring period, groundwater quality conditions are generally similar to historical results. CLs were exceeded in DMP wells AMW-6, AMW-7,AMW-12,AMW-13, and AMW-14. In addition, statistically significant increasing VOC concentrations were noted in well AMW-13, while statistically significant decreasing VOC trends were calculated in well AMW-14. In the CAP wells,trend analyses are performed instead of comparison to CLs. During the current monitoring period, statistically significant increasing trends were noted for VOCs in wells AMW-1 and AMW-10,while several decreasing VOC trends were noted for CAP well AMW-11. As summarized in the Annual Corrective Action Evaluation prepared by Herst&Associates (2006),no CAP wells have exceeded the site's threshold limits. 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. ez, G, CI-Ig Project Geolo 'st Attachment C:12003.021WORWARDLT&DOC -2- Geologic Associates