advantage, because if you run the water tarorga a filtration plant, the veal phosphorous stays on the sida, DR. HERDS: Whon you are ashed about the concentration factor for plants, you imnediately went to the Planktonic alga and you andsdented 350,059 multiplication factor, tively low in radioactivity. }. ' fy Q aquatic seed tyres that are growing in the water. They are is of concentration factor does not request for terrestrial o7 G Sl I know that you would like to exphasise that that sort I thought the ecolesists might be ‘Anterested in knowing that ws do not have such a concentration in sced piants that have their roots in tho river. DR. FOSTER: That is true, The margin of vegetation is “much lower MISS PATRICK: Have you evor dona any studics on the attached algao? DR. FOSTER: Yes, We have studios on the attached algae, but the variability in this material is so great that we have almost stonved sampling the thing We have several factors which are involved in this attached algae. One is that we do fet @ rathor violent fluctuation in the Columbia River, The flood stase is the worst since this goos up from here (indicating) to about 15 feot hicher and back down acain during the flicod stase : There are wookly variations in terrs of a foot to a fcot and a half in this particular area (indicating) because of the power cams that aro usstream, and during the Sunday clese of