Fig. 1. The location of MNPS. TempMentor deployment locations are designated by the numerals "V 

 through '7". 



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 con- 

 centrations (ppb by weight) were converted to 

 degrees Farenheit above ambient temperature 

 (AT) and plotted on a trackline map for each of 

 the four surveys. Because heat loss to the atmo- 

 sphere was neglected, the indicated temperature 

 increases were higher than actual, particularly in 

 the far field. These data were contoured at the 

 1.5, 4, 6 and 8°F (0.83, 2.2, 3.3 and AA'C) AT 

 levels. Data from the vertical profiles were also 

 developed; these were plotted as AT versus depth. 



Results 



The results of 1987 hydrothermal studies com- 

 pleted between 20 August and 15 November 1987 

 follow. The results include those from both the 

 OSI-supported dye study and the NUSCO- 

 deployed temperature data loggers. 



Environmental conditions 



Meterological conditions in the vicinity of 

 MNPS during August through October reflect the 

 seasonal transition from summer to autumn. 

 Based on historical data acquired during eleven 

 years from the environmental data aquisition net- 

 work (EDAN), air temperature decreases from an 

 average of about 22° C in early August to about 

 lOX by the end of October (Fig. 2). Water 

 temperatures decrease from an average of 20°C in 

 early August to 14°C in late October (Fig. 2). 

 Winds tend to be liglit (2 - 2 m/s) in early August, 

 and increase in intensity to 3 - 6 m/s in October 

 (Fig. 2). Winds tend to be out of the north in 

 August, and from the west northwest in October 

 (Fig. 3). Although, conditions during this period 

 in 1987 were fairly typical of historical conditions 

 (Figs. 2, 3), a storm occurred 21-22 August 1987, 

 three days before the dye mapping. Wind speed 

 varied between 2 and 7 m/s during the period the 



330 



