PPT Slide

Previous slide

Next slide

Back to first slide

View graphic version

The temporal pattern of arsenic at the Vermont site was extremely “episodic”. More than half the attempted measurements were below the detection limit for arsenic (about 0.2 nanograms/m3). But occasional “spikes” were recorded at nearly 50 times the MDL level.

Relatively high concurrent levels of arsenic in VT and other northeastern sites suggested source influence at some distance from the region. The episodic exposure regime, suggests possible influence of an intermittent “plume hit” from a distant stationary source (or few sources).