recorded from 1700 hours, 21 August to 1400 hours, 22 August 

 at the quarry cut to characterize fluctuations in the natural 

 fluorescence of Long Island Sound waters. The instrument at 

 the Unit 1 discharge well was used to monitor for the 

 recirculation of cooling water. 



Turner Model 10 fluorometers equipped with thermistors and 



interfaced with Soltec two-pen strip chart recorders were 



installed on the horizontal transect and the vertical profile 

 boat . 



Surficial dye concentrations and water temperatures were 

 recorded along 41 transects during the four tidal mapping 

 sessions. These transects were oriented nominally 

 perpendicular to the axis of the thermal plume and along well 

 defined plume boundaries. Dye concentrations and water 

 temperature were also measured at 27 vertical profile 

 stations to characterize the vertical mixing of the thermal 

 plume. 



Quarry cut dye concentrations were monitored from 1500 hours, 

 23 August until 1200 hours, 27 August including both the 

 periods of dye buildup and flushing within the quarry. 

 Buildup took 10 hours before the quarry cut concentrations 

 stabilized at 2.2 ppb by weight. Similarly, it required 10 

 hours for concentration readings to stabilize after dye 

 inject ionwasstopped. 



Pre- and post-survey calibrations of the fluorometers were 

 conducted using standard solutions prepared with site water 

 and dye drawn from the lot used for the study. These 

 solutions were prepared employing Class A glassware which 

 meets or exceeds National Bureau of Standards requirements. 

 Water samples were also taken during the survey and used in 

 the lab to verify instrument responses. Specification sheets 



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