criteria do not exist for Fe and percent total organic carbon 

 (Table 3-2) , the results of statistical testing show that at all 

 stations, except 400NW and 400SE, metal concentrations and percent 

 total carbon were below detection limits or were not significantly 

 different from those at the reference station (Table 3-3) . 

 Concentrations of Pb, As, Fe, Cu, and percent total organic carbon 

 at station 400SE were all significantly elevated relative to 

 NLON-Ref levels, whereas concentrations of As and Cu at 400NW were 

 depressed (Table 3-3) . Concentrations of metals and percent 

 carbon were elevated above reference levels at station 400SE 

 within a factor of one or two (Figure 3-21) . 



Concentrations of organochlorine pesticides and PCB's in 

 sediments at New London were generally below the analytical 

 detection limits at all stations (Table 3-4) . Exceptions to this 

 were heptachlor at station 400NW, which was just above the 

 detection limit, and PCB's as Aroclor 12 32 at stations CTR and 

 1500NW and PCB's as Aroclor 1242 at stations 800SE and 400NW. 

 Concentrations of PCB's at these stations were well below the 1.0 

 ppm level considered to be confirmation of high contamination 

 according to the NERBC interim criteria (NERBC, 1980) . 



3 . 5 Body Burden Analysis 



The results of the triplicate analyses for five trace 

 metals (Cd, Pb, Cu, Fe, and Hg) in body tissues of the 

 suspension-feeding amphipod Leptocheirus are reported on a dry 

 weight basis (Table 3-5) . In the case of station center (CTR) , 

 the laboratory was sent two jars of organisms (collected on two 

 different sampling days) which were to be combined and treated as 

 a single sample. Inadvertently, the two jars were treated as 

 separate samples and the results were reported accordingly (i.e., 

 CTR#1 and CTR#2 ) . 



Concentrations of both cadmium and mercury in 

 Leptocheirus were below analytical detection limits at all 

 stations. Pb, Fe, and Cu were elevated at station 400SE and Cu 

 was elevated at station CTR#2 (Figure 3-22) , although in all cases 

 the magnitude of these elevations above the reference were less 

 than a factor of three. Statistical tests confirm that Pb and Cu 

 at CTR#2 and 400SE, Fe at 400SE, and Cu and Fe at 1500NW were all 

 significantly higher than the reference concentrations (Table 

 3-6) . Elsewhere, Leptocheirus body burden levels were either 

 significantly less than or did not differ significantly from the 

 reference animals. 



The results of the triplicate analyses for PCBs (as 

 Aroclor 1254) in body tissues of Leptocheirus (Table 3-7) 

 indicated that concentrations were below the detection limit in 

 two of the replicates at station 1500NW and one replicate at 

 station 400NW. Although the highest PCB body burdens occurred at 

 the reference station (Figure 3-22) , the difference between the 



