but thove are some 120 miles of the river which is all that is involved, and this is a straicht Plowing river in kere (indicating A year or so ago, the UcNary Bam was comploted. 2 roservoir and dam back here (indicating). This is partly Th seedy tie teen; ‘= sty Now, what does tho Colivahia Rivor loos liko? botten is mestly eobbiestoncs. and silt donesitdon here. 4 This. There is very little sedimcntation Those area these white bluffs that 2, Pearce was monticning yestorday on the cast sice of the river. The Columbia River, in spite of its large size, has marvelous characteristics of a mountain stream, more so than it does of a slov moving river. I think the difxerence between this and the Savannah River that we heard about yesterday is about as aqifferent as you can find. I have not seen the Savannah, but from the description I have heard, it must be considerably differeat. The types of botton forms that we have to deal with are the swift water mountain forms, lots of May flies, lots of snails, sparse Plankton population in a rapidly flowing water stream, aS you would expect, and so forth. The source of our radioactive uaterials in the Columbia River originates in the reactor and this pornaps recalls seme of the thinss that Dr. Pearce mentioned yesterday. A typical reactoz area pulis water out of the River, pulls it throvuth a water