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Plume Maps Trace Contours of AU Groundwater Contamination
"Further planned groundwater study efforts include installation and sampling of the remaining 3 deep wells, quarterly sampling of selected wells for a time frame of 1 year, additional characterization of the perchlorate plume source on the AU campus using 15 temporary wells upgradient of the highest perchlorate concentrations to date, and isotopic analysis of perchlorate ... The 2007 and 2009 perchlorate contours are more complete due to more down-gradient groundwater sampling points, with the highest perchlorate concentrations of 146 ppb and 50 ppb, respectively, located at PZ-4 on the AU campus."
"Quarterly groundwater monitoring will be conducted during the next year to determine whether groundwater perchlorate concentrations change seasonally and whether any significant trends in perchlorate concentrations are associated with specific times of the year ... The temporary wells are specifically designed to pinpoint the location of a potential perchlorate source on the AU campus that requires further investigation. Sampling of these temporary wells may delineate a clear line between high and low perchlorate concentrations."
Todd Beckwith, USACE
Restoration Advisory Board Meeting
January 11, 2011
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