(0.2 5-0.4 8 ppm) than the concentrations reported by Munns et al. 

 (in preparation) . 



Similar results were also observed for chromium and 

 copper. Munns et al. (in preparation) reported that chromium 

 concentrations in Nephtys collected away from dredged material 

 ranged from 1-5 ppm dry weight. This is slightly higher than the 

 range of concentrations (0.42-0.72 ppm) found in the present 

 study (Table 4-3) . For copper the range of concentrations 

 reported here are 12-16 ppm compared to about 22-33 ppm at the 

 Central Long Island Sound Reference station (Munns et al . in 

 preparation) . 



The iron concentrations showed a similar trend. The 



concentrations reported for the present study were between 490 



and 570 ppm dry weight whereas those measured by Munns et al. (in 

 preparation) were all between 400 and 1100 ppm. 



The PCB concentrations reported here (Table 3-8) for 

 Nephtys were below the analytical detection limits for all but 

 two samples. In both cases the measured concentrations were 

 Aroclor 1254 in organisms collected from the Reference station. 

 The levels measured were 420 and 620 ppb dry weight. These 

 levels are slightly higher than those measured by Munns et al . 

 (in preparation) in Nephtys from their Reference station at CLIS 

 (186-375 ppb) . 



It is somewhat surprising to see measurable PCB 

 concentrations in the Reference organisms and not in those 

 collected from the WLIS-A station. This would not be expected 

 because the sediment PCB results showed a level of 9 ppb at the 

 Reference station and 500 ppb at WLIS-A (Table 3-1) . In all 

 cases, the measured wet weight concentrations for mercury (Table 

 3-7) and PCBs (Table 3-8) are well below the FDA Alert Levels 

 (0.2 ppm for mercury, 2 ppm for PCB's). 



5.0 CONCLUSIONS 



The results of the analysis of the bathymetric data 

 collected at the WLIS Disposal Site indicates an accumulation of 

 sediment (estimated from bathymetry surveys to be approximately 

 35,700 m 3 ) in the vicinity of the disposal buoy. Comparison of 

 the contoured bathymetric charts from the October 1985 and the 

 August 1986 surveys reveals a decrease in depth at the buoy 

 location and on the west flank of mound "C" and the northeast 

 flank of mound "A". Because of the buoy's position between the 

 two mounds, the deposited dredged material will tend to create a 

 single, wide flat mound. This may, in fact, aid in stabilizing 

 the dredged material. The peaks of dredged material mounds are 

 usually the site of any initial erosion that may occur. 



17 



