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demonstrations (NRD),which have concluded that the CL exceedances are likely the result of <br /> ® naturally occurring conditions and therefore not indicative of a release from the Forward <br /> Landfill. <br /> During the fourth quarter 2006 monitoring period,methane was measured at concentrations less <br /> than five percent in perimeter soil-pore gas probes, suggesting that the landfill gas extraction <br /> system is effectively reducing methane concentrations along the perimeter of the Forward <br /> Landfill. <br /> The results of the annual leachate sample indicates that of the constituents detected, only sulfide <br /> and 3-&-4-methylphenol were potential new constituents of concern (COCs). Verification <br /> samples will be collected from the Forward leachate sample point in February 2007 and reported <br /> with the first quarter 2007 monitoring report. <br /> For the Austin Unit, during the fourth quarter 2006 monitoring period. Excluding suspected <br /> laboratory contaminants, CLs were exceeded in DMP wells AMW-6, AMW-7,AMW-12, <br /> AMW-13, and AMW-14. Of the CL exceedances, a statistically significant increasing trend was <br /> noted for hexavalent chromium in well AMW-12, and for several VOC constituents in well <br /> AMW-13. Statistically significant decreasing VOC trends were calculated in well AMW-14. In <br /> the CAP wells, trend analyses are performed instead of comparison to CLs. During the current <br /> monitoring period, statistically significant increasing trends were noted for VOCs in wells <br /> AMW-1 and AMW-10,while decreasing VOC trends were noted in corrective action program <br /> (CAP) wells AMW-1,AMW-4, and AMW-11. <br /> The annual leachate sample results indicates that of the constituents detected,mercury and the <br /> pesticides dicholorvos and naled are potential new COCs. Therefore, in accordance with WDR <br /> No. R5-2003-0049,verification samples will be collected from the Austin leachate sample point <br /> in February 2007 and reported with the first quarter 2007 monitoring report. <br /> According to the Forward Landfill Operations Manager, weekly standard observations have been <br /> conducted during the reporting quarter. The Forward Landfill Operations Manager also reported <br /> that no surface water was discharged during the reporting period. <br /> If you have any questions regarding this report,please call me at(858)451-1136. <br /> Sincerely, <br /> I. <br /> Wil iam B. Lo z, PG, CHg <br /> Project Geol ' t <br /> Attachment <br /> C:\2003-021\FORWARDLTR.DOC <br /> -2- <br /> GeoLogic Associates <br />