136 



Exhibit A 



Specific Comments on the Risk Assessment Document 



P. VI. Par. 2. Line 6 : 



30 to 92 percent is misleading at dams where turbines are completely screened 

 (Lower Granite, Little Goose, Lower Monumental and John Day). Guidance ranges from 40 

 to 80 percent for spring chinook, 75 to 86 percent for steelhead and 25 to 35 percent for sub- 

 yearlings. Guidance values at Bonneville second powerhouse are lower, but testing continues 

 there. Guidance values for Bonneville First Powerhouse are similar to the upstream dams. 



P. VT. Par. 3. Line 6 : 



Research carried out in the 1960's, 1970's and 1980's (Bjomn 1992) indicated high 

 spill delays adult migrants. Observation of pre-spawning mortality during periods when gas 

 levels ranged between 120 and 125 percent (p. 29) seem to refute this statement. 



P. 4. Par. 2. Lines 8 and 9 : 



The direct and indirect mortality components are not known for bypasses except for 

 the data obtained at Bonneville Dam. 



P. 5. Par. 2. Line 3 : 



The turbine range 8-32 percent is not correct. See later comment page 30. 

 P. 5. Par. 3. Lines 1-3 : 



See comment P. VI, Par. 2, Line 6 above. 

 P. 5. Par. 3. Line 4 : 



There are no data to support this contention. In fact, data shows that stresses 

 encountered in the bypasses are completely alleviated during holding and transport (Maulo si 

 aL (1988) and Congelton et al. (1984)). 



P. 5. Par. 3. Line 2 : 



This was true because mid-Columbia dams do not have bypass systems nor do they 

 collect and transport. 



13 



