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During the January and February 2007 inspections,the CEHD measured methane at <br /> concentrations exceeding the regulatory limit of 5 percent in perimeter soil-pore gas probes <br /> GP-11 and GP-12. However, during the March inspection only soil-pore gas probe GP-11 <br /> exceeded the regulatory limit, suggesting an improvement in landfill gas in the vicinity of probe <br /> GP-12. Forward continues to install additional landfill gas extraction wells(as needed), and <br /> makes regular adjustments to the landfill gas extraction system to optimize efficiency of the <br /> landfill gas extraction system. <br /> The retest results from the annual leachate sample confirm the presence of sulfide and <br /> 3-&-4-Methylphenol and both constituents have been added to the COCs list for the Forward <br /> Landfill. <br /> Groundwater quality conditions beneath the Austin Unit during the first quarter 2007 monitoring <br /> period are generally similar to�historical results. CLs were exceeded in DMP wells AMW-6, <br /> AMW-7,AMW-13, and AMW-14. However,none of the CL exceedances exhibited statistically <br /> significant increasing trends. In addition, several statistically significant decreasing VOC trends <br /> were calculated in well AMW-14. In the CAP wells,trend analyses are performed instead of <br /> comparison to CLs. During the current monitoring period, one or more statistically significant <br /> increasing trends were noted for VOC constituents in wells AMW-1,AMW-10, and AMW-19, <br /> while decreasing VOC trends were noted in CAP wells AMW-1 and AMW-1 1. <br /> The retest results for the annual leachate sample confirmed the presence of mercury in the <br /> leachate sample. Therefore,mercury has been added to the COC list for the Forward Landfill. <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 /> 4 <br /> t <br /> Will B. p z,PG, CHg <br /> Project Geolo st <br /> Attachment <br /> C:\2007.004S\PORWARDLIRDOC <br /> -2 <br /> Geologic Associates <br />