3.6 



Isothermal Data 



Since both dye concentration and water temperature Are held 

 to be convervat i ve , the percent drop in the temperature of 

 the plume with respect to the total temperature difference 

 between the discharge water and the receiving body of water 

 is equal to the percent dilution of the dye in the plume with 

 respect to the dye concentration of the discharge water at 

 the quarry cut. Dye concentrations in ppb by weight were 

 converted to degrees Farenheit above ambient temperature and 

 plotted on a trackline map for each survey. These data were 

 contoured at the 1.5 ,4,5 and 8 F delta-T levels and are 

 presented on Figures 10 through 13. Data from the vertical 

 profiles at increasing distances from the quarry cut along 

 the axis of the plume were also developed and plotted 

 as delta-T versus depth. These profiles are presented on 

 Figures 14 through 17. Additional vertical profiles not 

 associated with the axis of the plume are also presented on 

 Figuresl4throughl7. 



4.0 



DISCUSSION OF DATA 



4.1 



Background Fluorescence 



Prior to initiating dye injection, the natural or background 

 fluorescence of the circulation water was recorded at the 

 quarry cut on Millstone Nuclear Power Station. Tide 

 elevations were also measured from 1700 hours, 21 August to 

 1400 hours, 22 August, 1987 and are presented together with 

 the background fluorescence data on Figure 8. The background 

 fluorescence remains near zero for the first 14 hours of the 

 study. From 0700, 22 August the background fluorescence is 

 seen to rise, coinciding with d storm event which occurred 

 that day. The increase in fluorescence may represent the 

 presence of naturally fluorescent material introduced into 



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