Hanford's "Big Dig"

What's being called a "big dig" at the Hanford site has workers digging more than 85 feet deep into the ground.

Contractor Washington Closure Hanford is digging up soil near the "D" reactor.  The soil is contaminated with chromium, which was used in the nuclear reactor to prevent rusting.  The soil is near the Columbia River and is contaminating ground water.

Department of Energy spokesperson Cameron Hardy says chromium at low levels is not harmful to humans but is extremely toxic to fish and fish eggs.

When complete this summer,  the giant hole will be the size of seven football fields.