ARCHIVED REPORTS_2011_14 - Laserfiche WebLink

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herbicides,or pesticides were detected in the annual leachate sample and there were no new constituents of concern(COCl)detected. Groundwater quality conditions beneath the Austin Unit during the fourth quarter 2011 monitoring period are generally similar to historical results. CLs were exceeded in detection monitoring program(DMP)wells AMW-7,AMW-13 and AM -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. It should be noted,however,that the barium concentration measured in the sample collected from well AMW-14 is within the historical range of values observed at this well,and is well below the state primary drinking water standard. In the corrective, action program(CAP)wells,trend analyses are performed instead of comparison to CLs. During the current monitoring period,statistically significant increasing trends were noted for one or more VOC constituents in CAP wells W-1,AMW-10, and AMW-19,while one or more decreasing VOC trends were no in CAP wells AMW-1,AMW-4,AMW-5R,AMW-10,and AMW-I 1. The increasing cis-1,2-DCE trends in wells AMW-1 and AMW-10,suggest that active reductive dechlorination is occurring in the vicinity of these wells. During the fourth quarter(annual)2011 monitoring period,the leachate results at the Austin Unit are generally similar to those observed historically. A total of 12 dissolved metal constituents were detected;six VOCs were detected(with four measured above their PQL-s);and two SVOCs were measured above their PQLs. No pesticides or herbicides were detected in the leachate sample. Review of the leachate sample data indicates no new COCs were detected. According to the For Landfill Operations Manager,standard observations have been conducted weekly during the reporting quarter. The Forward Landfill Operations Manager also reported that no surface water was discharged from the facility 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 haven questions regarding this report,please call me at(209)982-4298. Sincerely J Doani Id Area Environmental Manager Attachment QUO I