dominant current regime) (Figure 2-3) . Six polycarbonate plastic 

 core liners (6.5 cm ID) were pushed into the sediment grab sample 

 and extracted; the top 2 cm of sediment from five of these cores 

 were combined and placed into bags for subsequent chemical 

 analysis by the NED laboratory. The top 2 cm of the remaining 

 core from each of the triplicate grab samples were combined and 

 placed into a bag for subsequent physical analysis by the NED 

 laboratory. The samples were kept on ice until delivered to the 

 NED laboratory where they were stored at 4C until analyzed. The 

 parameters measured include grain size, trace metals (Fe, As, Cd, 

 Hg, Pb, and Cu) , total PHC's and PCB's, and % total organic 

 carbon. Analytical methods are those of the U.S. Environmental 

 Protection Agency (Plumb, 1981) . 



2.5 Body Burden Analysis 



The test organisms (tubicolous amphipods) for body 

 burden analysis were collected using the Smith-Mclntyre grab at 

 each of the six stations where sediment samples were taken (Figure 

 2-3) . As the sediment was discharged and rinsed from the grab 

 into a collection tub, the amphipods vacated their tubes and 

 accumulated at the surface of the water and could be scooped out 

 with a plastic dip net. Adding more water to the sediment and 

 breaking down any sediment clumps released additional amphipods. 

 Initial examination of amphipods collected in this manner revealed 

 that approximately 95% (wet weight) of the individuals were of the 

 genus Leptocheirus . Therefore, Leptocheirus was chosen as the 

 target organism for all New London body burden stations. The 

 animals were allowed to depurate for 24 hours in aerated seawater 

 before being frozen for transport to the laboratory. Amphipod 

 tissue was analyzed for five metals (Fe, Cd, Hg, Pb, and Cu) 

 following methods in US EPA (1983) and total PCBs (as Aroclor 

 1254) following methods in US EPA (1977) . These analyses were 

 conducted by Environmental Monitoring Laboratory, Inc. 

 (Wallingford, CT) . 



3 . RESULTS 



3 . 1 Bathymetry 



The contour plot resulting from the analysis of the July 

 1987 bathymetric survey at New London (Figure 3-1) depicts the 

 five disposal points: NL-RELIC", "NL-I", "NL-II", "NL-III" and 

 "NL-85" . Comparison of this plot with the July 1986 plot (Figure 

 3-2) reveals a marked depth change at " NL-85". At this mound, 

 depth decreased from 17.5 meters in 1986 to 15.5 meters in 1987, a 

 maximum reduction of 2.2 meters. The peak of this mound was found 

 to be approximately 60 meters south-southeast of the disposal 

 buoy. 



