27 



Table 2-5 



Seawolf Disposal Mound 



1997 Sediment Grab Samples 



1997 





NAD83 





Aiaa 



Station 



Latitude 



Lonqitude 





CTR 



41° 16.452' N 



72° 04.858' W 



Seawolf Mound 



75E 



41° 16.455' N 



72° 04.833' W 





150W 



41° 16.464' N 



72° 04.979' W 



41° 16.456' N 



150N 



41° 16.542' N 



72° 04.873' W 



72° 04.863' W 



300SE (C) 



41° 16.335' N 



72° 04.688' W 





300WSW 



41° 16.382' N 



72° 05.068' W 



2.3.2 Laboratory Analysis 



Each taxon and its number of representative individuals were recorded within a 

 spreadsheet for each sediment sample in the order of its respective National Oceanographic 

 Data Center (NODC) code. These data were then incorporated into a database to aid in 

 statistical analysis. Total faunal abundance and number of species were calculated for each 

 station, with the ten most abundant species determined and displayed within a species list. 

 Juvenile and undeterminable organisms were included in calculations of relative density, but 

 were excluded from diversity analyses unless no other species belonging to those taxa were 

 present in the sample. Diversity was calculated as Shannon-Weiner index H' and the 

 associated evenness J' as well as by the rarefaction method (Sanders 1968). The Shannon- 

 Wiener index was calculated using the base log 2 ; for the rarefaction, the number of 

 individuals was set at defined points between 25 and 800 (Blake and Williams 1997). 



2.4 Sediment Cores 



Sediment cores were collected over the Seawolf Disposal Mound as part of both the 1997 

 and 1998 environmental monitoring surveys. The cores provided visual cross-sections of the 

 dredged material deposited during the 1995-1996 disposal season and aided in developing 

 sediment chemistry profiles to verify the integrity of the cap. In accordance with the U.S. Navy 

 monitoring plan, 12 stations were placed within three separate zones established over the 

 Seawolf Mound. These zones were designed to facilitate spatial comparison of potential 

 contaminants on the horizontal plane, with proximity to the mound apex. 



Monitoring Cruise at the New London Disposal Site, Seawolf Mound 1995 - 1998 



