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On October 15, 2008, the United States Environmental Protection Agency (USEPA) lowered the National Ambient Air Quality Lead Standard from a quarterly average of 1.5 µg/m3 to a rolling three-month average of 0.15 µg/m3, effective October 2009. The method of collecting the samples did not change. The current standard for the Site is 1.5 µg/m3.
* These sample results may have been affected by blank contamination (click here for an explanation) and thus may overestimate the lead present in the air when the sample was taken. ** The screen on the co-located sampler was blank when field staff retrieved it in the morning, so we did not have a volume in order to calculate concentration. The sample was therefore sent in for total lead analysis and that result was below the laboratory detection limit (<0.05 ug).
Page Last Modified Tuesday March 02, 2010 02:45:47 PM
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