TABLE 5. Comparison of predicted and actual surface areas encompased by selected AT isotherms pro- 

 duced during three-unit operation. 



Tide stage 



Area in acres encompassed by each isotherm 

 8.0°F (4.4°C) 6.0°F (3.3°C) 4.0°F (2.2°C) 1.5°F (0.8°C) 



Low slack 



Predicted for 3 units 

 Predicted for 3 units (extreme) 

 Hydrothermal survey, 8/26/87 

 Max Flood 

 Predicted for 3 units 

 Predicted for 3 units (extreme) 

 Hydrothermal survey, 8/26/87 

 High slack 

 Predicted for 3 units 

 Predicted for 3 units (extreme) 

 Hydrothermal survey, 8/26/8 

 Max Ebb 



Predicted for 3 units 

 Predicted for 3 units (extreme) 

 Hydrothermal survey, 8/26/87 



1 determined from average conditions, NUSCO 198.'? 



2 reported in NUSCO 1983 



3 limit readied 



TABLE 6. Comparison of maximum predicted and actual distances to selected AT isotherms produced dur- 

 ing three-unit operation. 



Distances in feet from quarry cut to each isotherm 

 8.0°F (4.4°C) 6.0°F (3.3°C) 4.0°F (2.2°C) 1.5° 



Tide stage 



F (0.8"C) 



Low slack 



Predicted for 3 units 

 Predicted for 3 units (extreme) 

 Hydrothermal survey, 8/26/87 

 Max Flood 

 Predicted for 3 units 

 Predicted for 3 units (extreme) 

 Hydrothermal survey, 8/26/87 

 High slack 

 Predicted for 3 units 

 Predicted for 3 units (extrem.e) 

 Hydrothermal survey, 8/26/87 

 Max Ebb 



Predicted for 3 units 

 Predicted for 3 units (extreme) 

 Hydrothermal survey, 8/26/87 



1 determined from average conditions, NUSCO 1983 



2 reported in NUSCO 1983 



3 limit reached 



4 4°F isotherm extends to 6,000 ft as determined from temperature recorded during deployment 



A feature of the plume that was apparent from 

 the continuous temperature records, but was not 

 readily apparent from either the dye survey results 

 or the plume predictions was the highly dynamic 

 nature of the plume. Even though the plume 

 reached White Point, it influenced water temper- 



atures there for brief periods only and elevated 

 temperatures did not appear to be sustained there. 

 Further, based on both the survey and supple- 

 mental temperature data collected thus far, water 

 temperatures greater than 4°F above ambient do 

 not appear at distances greater than 6,000 ft ( 1 829 



Hydrothermal Studies 345 



