ARCHIVED REPORTS_2010_13 - Laserfiche WebLink

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sampling event),and a second independent sample will be collected in June 2010. The results of the two retests will be submitted to DTSC and RWQCB under separate cover. During the February and March 2010 inspections,methane concentrations exceed the regulatory limit of five percent in perimeter soil-pore gas probe GP-11 for the shallow and/or intermediate depth probes. 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 2010 monitoring period are generally similar to historical results. CLs were exceeded in detection monitoring program(DMP)wells AMW-13 and AMW-14,however,with the exception of the barium concentration measured in well AMW-14,no CLs were exceeded for constituents that 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 volatile organic compound (VOC)constituents in CAP wells AMW-1,AMW-10,AMW-19,and AMW-19BR,while one or more decreasing VOC trends were noted in CAP wells AMW-1,AMW-10,and AMW-11. The increasing vinyl chloride and/or cis-1,2-DCE trends in wells AMW-I and AMW-10 suggest that active reductive dechlorination is occurring in the vicinity of these wells. 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. I certify under penalty of law, that I have personally examined and am familiar with the information submitted in this document and all attachments,and that based on my inquiry of those individuals immediately responsible for obtaining this information, I believe that the information is true,accurate, and complete. I am aware that there are significant penalties for submitting false information,including the possibility of fine and imprisonment. If you have any questions regarding this report,please call me at(209)982-4298. Sincerely " — i on LiSch jeldA Environmental Manager Attachment CW009-0017ftmard[Ar-1 Q I Moe -2-