Table 3. Summary of impingement collections made per week. Unit 1 impingement collections were made from 1971, when it 

 first became operational, through 1983. Impingement collections at Unit 2 were made from the time it became operational (1976) 

 to the present. 



If necessary, additional samples were taken to ensure that 5 samples were collected during April. 



If necessary, additional samples were taken to ensure that 10 samples were collected during December. 



During the first 3 yr of impingement monitoring (1972-1974), lengths of all fish impinged were 

 recorded. From January 1973 to April 1975, length information was recorded for each species by categories: 

 less than 3 in, 3 to 6 in, and greater than 6 in. This method did not accurately describe the sizes of 

 various species and was discontinued. In May 1975, the present practice of measuring up to 50 individuals 

 per sample was instituted. However, in 1977 and 1978, 100 or more individual lengths per species were 

 recorded. Fifty measurements per sampling date for each of five taxa (winter flounder, silversides, thrcespine 

 stickleback, grubby, and long-fmned squid) were randomly selected from the data base. The resulting 

 length frequency distributions were compared to the entire distributions for each species using chi-square 

 goodness-of-fit tests. For all five species, the random length distributions with 50 measurements were not 

 significantly different (p > 0.98) from the original distribution (NUSCo 1983). 



Trawl program 



The trawl sampling program was established in April 1973 to monitor demersal fish. Throughout 

 the program, demersal fish were sampled using a 9.1-m otter trawl with a 0.6-cm codend liner. Initially, 

 one 15-min haul was made biweekly at each of seven stations, including 1, 4, .IC (previously called station 

 6), 7, IT (previously station 8), 9 and 10 (Fig. 4). In September 1974, station IN (previously station 11) 

 was added because it was a potential location for the Unit 3 intake. In February 1975, station NB 

 (previously station 5) was added to provide a more representative sample from Niantic Bay. Sampling 

 began at station NR (previously station 2, then N2) in June of 1975 to obtain infonnation on fish 

 communities in the lower Niantic River. In February 1976, station BR (previously station 14) was added 



10 



