(Carpenter 1975). These studies were conducted to: 1) determine 

 entrained phytoplankton species composition and whether entrained cells 

 were destroyed; 2) determine the effects of entrainment on primary 

 productivity; 3) determine the effects of plant operation on the phyto- 

 plankton community in adjacent waters. 



Species composition and abundance of phytoplankton entrained were 

 determined from cell counts on whole water samples. Samples were collected 

 biweekly at the Intake (Figure 1) from September 1970 through June 1971 

 and examined with the Utermohl technique. Concurrent with the Intake 

 sampling during March through June 1971, samples were collected at the 

 Discharge and Quarry Cut to determine if cells were destroyed during 

 plant passage. No significant difference was found between Intake and 

 Quarry Cut cell densities (Carpenter 1975). 



The effect of entrainment on primary productivity was examined 

 during 1971 with light-dark bottle carbon-14 samples collected at the 

 Intake, Discharge and Quarry Cut (Carpenter et al. 1972, Carpenter 

 1975) . After plant passage, without chlorination, productivity increased 

 in the cooler periods and decreased when the discharge temperature 

 exceeded 28 C. Chlorination decreased productivity even at concentra- 

 tions below which would control biofouling. To minimize stress on the 

 phytoplankton community, the recommended chlorination regime was inter- 

 mittent chlorination for the shortest possible period. 



The effect of plant operation on the phytoplankton community adjacent 

 to Millstone was examined from August 1971 through June 1972 (Carpenter 

 1975). Chlorophyll ji and primary productivity were measured at two 

 control stations and two stations in the effluent mixing zone (predicted 

 5-10% phytoplankton reduction). No detectable difference was found 



