ARCHIVED REPORTS_2013_2 - Laserfiche WebLink

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For the Austin Unit, no significant changes in the water quality analytical results were noted. During the fourth quarter 2013 monitoring period, non-statistical exceedances for VOCs were identified at DMP wells AMW-6, AMW-13, and ANMW-14, of which, statistically significant increasing temporal trends were calculated for tetrachloroctliene (PCE) and trichloroethene (TCF) in well AIMW-13 and for PCE at well ANIW-14. These results are similar to previous results and it has been recommended that wells AiMW-6, ANNIW-1 3, and AiNIW-14 be re- designated as Corrective Action Program (CAP) wells since they have historically contained VOCs. For the routine inorganic monitoring parameters, CLs were exceeded for constituent concentrations in Detection \Monitoring Program(DMP) wells AINA W-12, A1`vIW-13, and ANIW- 14. Trend analyses indicate that statistically significant increasing temporal trends were calculated for barium and chloride concentrations in wells AMW-12 and AIMW-14. In the CAP wells, trend analyses are performed instead of comparison to CLs. During the current monitoring period, statistically significant increasing trends were noted for three VOCs in CAP well AIMW-1, while decreasing VOC trends were noted for one or more VOCs in CAP wells A1`vIW-1, AMW-4, AMW-10, ANIW-11, and MAW-I 913R. The (organic decreasing ( anic and t;' ZD inorganic)trends noted in most of the CAP wells, suggests that corrective action measures have been successful in reducing facility related groundwater impacts downgradient of the Austin Unit. The results of the annual leachate sample collected for the Austin Unit are similar to those observed historically. Eight VOCs, one SVOC, I I metals, and numerous inorganic constituents were detected in the alinual leachate sample. No herbicides or pesticides were detected and no new COCs were detected. According to the Forward Landfill Operations klanager, 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 iniprisoinnent. If you have any questions regarding this report, please call me at (209) 982-4298. Sincerely, Erin Fanning Environmental Manager Attachment CO2013-002 ffom a rdLtr 4Q13 -2-