Magnified images are viewable for some of the sectors of this map (those sectors along the plume). If placing your mouse cursor over a sector of the map causes that sector to blur slighlty, clicking on that sector will show the magnified view.    [Your computer may block the active script that causes this to happen.]    Close the browser window to return to this map.

The map to your left shows the detected concentrations of perchlorate in the plume originating from the Stringfellow Hazardous Waste Site in Glen Avon, California. The map was produced by the California Department of Toxic Substances Control and is dated August 2002.

The unit of perchlorate concentration used is Micrograms per Liter, which is equivalent to parts per billion (ppb). The category of highest concentration (yellow) has a range of 10000 to 87000 ppb. The category of lowest detected concentration (pale green) is 4 to 10 ppb.