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During the third quarter 2008 monitoring period, methane concentrations did not exceed the <br /> regulatory limit of five percent in perimeter soil-pore gas probes at the Forward Unit. Forward <br /> continues to install additional landfill gas extraction wells (as needed), and makes regular <br /> adjustments to the landfill gas extraction system to optimize efficiency of the landfill gas <br /> extraction system. <br /> The retest results for the 5-year constituents of concern (COC) sampling conducted during the <br /> second quarter 2008 monitoring period indicates that none of the COCs were confirmed in the <br /> retest samples, suggesting that the primary results were false positives, and no changes to the list <br /> of monitoring parameters is warranted. <br /> Groundwater quality conditions beneath the Austin Unit during the third quarter 2008 monitoring <br /> period are generally similar to historical results. Excluding suspected field/laboratory <br /> contaminants, CLs were exceeded in DMP wells AMW-6, AMW-7, AMW-13, and AMW-14. <br /> However, none of the CL exceedances exhibited statistically significant increasing trends. In the <br /> CAP wells,trend analyses are performed instead of comparison to CLs. During the current <br /> monitoring period, one or more statistically significant increasing trends were noted for VOC <br /> constituents in CAP wells AMW-1, AMW-10, and AMW-19, while decreasing VOC trends were <br /> noted in CAP wells AMW-1,AMW-4, AMW-10, and AMW-11. The increasing vinyl chloride <br /> and/or cis-1,2-DCE trends in wells -1 and AMW-10 suggest that active reductive <br /> dechlorination is occurring in the vicinity of this well. <br /> ANIL <br /> The retest results for the 5-year COC sampling conducted during the second quarter 2008 <br /> monitoring period indicates that none of the COCl were confirmed in the retest samples, <br /> suggesting that the primary results were false positives. <br /> If you have any questions regarding this report, please call me at(858) 451-1136. <br /> Sincerely, <br /> 'h b I <br /> William B. Lop z, CEG, CHg <br /> Project Geologist <br /> C:M0&M1OkForaardLtr 3Qo8.doc q <br /> —2— <br /> GeoLogic Associates <br />