"t>II 



Data from these calculations were compared with direct measurements of 

 the combined effluent and found to be accurate to 0.1°C and 0.05 o/oo 

 salinity. 



STATION LOCATIONS 



Figure 3 shows the location of stations in Safe Harbor. Stations lOA 

 and lOB were used as controls and were located in another basin about 

 two kilometers east of Safe Harbor (Fig. 3). They were located on a 

 vertical rock wall adjoining undeveloped military property. Hydrologic 

 conditions were similar to those in Safe Harbor but there were no 

 effluents discharged into the control area. 



Before selecting locations for the stations a survey was made of Safe 

 Harbor and basic characteristics of the effluent discharge. This survey 

 showed that the effluent did not mix uniformly in the harbor and that a 

 dense, hot layer of effluent-laden water formed a well defined stratum 

 throughout the harbor (see Section V). Stations were installed in and 

 above this stratum on the vertical rock walls. The shallower stations, 

 8 to 10 feet (2.4 to 3.0 meters), were designated "A" stations and v 

 relatively free from effluent from the desalination plant. The deeper "B' 

 stations, 24 to 26 feet (7.3 to 7.9 meters), were exposed to the effluent 

 and were placed directly below each "A" station. Biological activities at 

 the stations are listed in Table I and depicted in Figure 4. 



EFFLUENT DISPERSION 



To interpret the biological data, it was essential to determine the 

 distribution and concentration of effluent in the receiving water. 

 Hydrographic measurements, sediment analyses, and observations of dye 

 dispersion by divers provided the required effluent dispersion data. 



Hydrographic measurements included temperature, salinity, copper, dissolved 

 oxygen, alkalinity, and currents. Since the purpose of these measurements 

 was to determine the amount of effluent present at the biological field 

 stations, the technique of collection and analysis of the data was designed 

 to eliminate ambient fluctuations and to calculate the percent effluent 

 at the stations. This was accomplished by comparing characteristics of 

 the water at the station with similar data from the discharge and the 

 mixing water and calculating, by a simple dilution formula, the percent 

 of effluent. Both conservative (salinity and copper), and semi-conserva- 

 tive (temperature) measurements were used for determinations. 



If (E) represents the percent effluent at the station, (? ^) the parameter 



measured at the station, (P ) the same parameter of the mixing water, and 



m 

 (P ) the same parameter of the effluent then: 

 e 



20 



