Groundwater

Of all the troubling images evoked by the Hanford Nuclear Reservation, the nation’s most contaminated nuclear site, the plume of uranium-tainted groundwater seeping into the Columbia River comes near the top of the list. Millions of gallons of radioactive waste were processed at the site and, starting in the ’40s, government scientists detected it in the area’s groundwater.

One site, called the 300 Area, has a plume of several million gallons affecting a 3,000-foot stretch of the Columbia River shoreline. Monitoring wells and riverbank springs have had uranium levels in excess of drinking-water standards set by the Environmental Protection Agency.

The river provides drinking water … » More …