Table I. Summary of ofTshore plankton sampling program. 



' Sample technique - one 15-min sawtooth oblique towusing a bongo frame rigged with 0.333-mm mesh and n.SOS-mm mesh 

 plankton nets. Station NB previously reported as station 5. 



Same as "a", but replicate stratified (surface and bottom) and oblique tows were also done on a regular basis at randomly 

 selected stations (see Battelle 1976 for details). 



In 1979 towing methodology consisted of 15-min sawtooth oblique tows using a bongo frame rigged with two n.333-mm 

 mesh plankton nets. Beginning in 1980 the methodology changed to a stepped oblique tow (5 min lop, 5 min mid-depth, 5 

 min at bottom), f-rom 1983 to present a wire angle-indicator was u.sed to accurately position the net at surface, mid and 

 bottom. 



total of 18 samples per week) to improve the accuracy of den.sily estimates and increase the sensitivity of 

 subsequent analy.ses. When Unit 2 began using cooling water (fall 1976), sampling at l',N began alternating 

 weekly between the discharge structures of Units 1 and 2, when operating conditions permitted. I'he 

 electronic flowmeter was replaced with an array of four General Oceanics flowmeters in 1080. The bases 

 for replacing the electronic flowmeter were high cost, poor maintenance record, and inability to account 

 for vertical and horizontal differences in flow observed at the discharges of the two Units (NUSCo 198.^). 

 The program was reviewed several more times (NUSCo 1981a, 1983, 1984a) and the sampling frequency 

 reduced according to the schedule in Table 2. The evaluation of these sampling schedules (NUSC'o 198.^) 

 indicated that no appreciable loss of accuracy had occurred despite a reduction in effort (see Appendix H). 



