employees. potential hazard of major release into the environment was just not there. >> the santa savannah field lab hill is contaminated with a veritable who's who of toxic chemicals to vaulttle acids and multiradioactive nuclides and also numerous reactions over the years. we actually describe not the half life, which is the time after which it would be half as potent as it was when it degrades. we describe something called its hazardous life which is equated to 20 half lives. these are the most dangerous, which we have well studied and well high awareness of their health impacts that go on for these hundreds if not half million years. >> right now half a million