hi spacing.' The objective of the survey was to map the existing 

 bottom topography at and around the disposal site. The 

 configuration provided adequate coverage to assess the distribution 

 of dredged material deposited at the site. Raw depth values were 

 corrected to Mean Low Water during analysis of the bathymetric data 

 by adjusting for the ship draft, tidal changes during the survey, 

 and the speed of sound. 



2.2 REMOTS® Sediment-Profile Photography 



REMOTS® photography was used to detect the distribution 

 of thin (0-2 cm) dredged material layers, map benthic disturbance 

 gradients, and monitor the status of infaunal recolonization on and 

 adjacent to the mound. A detailed description of REMOTS® photo 

 acquisition, analysis, and interpretative rationale is given in 

 DAMOS Contribution #60 (SAIC, 1989b) . 



A REMOTS® survey was performed on 27, 28, and 29 March 

 1990. REMOTS® photos were taken, in triplicate, at each of 37 

 stations surrounding the disposal site center (Figure 2-1) . In 

 addition, 9 REMOTS® stations were occupied at each of the three 

 reference areas to allow comparisons between ambient and on-mound 

 conditions. The 9 stations at each reference area were arranged 

 in a cross-shaped pattern and spaced 100 m apart. Reference areas 

 were centered at 41° 36.30'N, 70° 43.20'W (reference area 1), 41° 

 35.35'N, 70° 43.70'W (reference area 2), and 41° 34.60'N, 70° 

 41.15'W (reference area 3). Distances from the disposal site 

 center for the three areas were 3107 m NW, 3940 m W, and 2600 m SW. 

 Depths for the three reference areas were 11 m for reference area 

 1, 12 m for reference area 2, and 14 m for reference area 3. 



2.3 Benthic Sampling 



Macrofaunal benthic community samples were taken on 28 

 and 29 March to ground-truth the REMOTS® photos and provide an 

 indication of potential species for any future body burden 

 analyses. A 0.1 m 2 Smith-Mclntyre grab sampler was used to take 

 samples at six stations in the disposal site (1, 13, 20, 22, 23, 

 and 24; Figure 2-1) and at the center and 200 m W of each reference 

 area (Figure 2-1). The samples were sieved on a 0.5 mm mesh 

 screen, preserved in 10% formalin on board, transferred to 70% 

 ethanol after 48 hours, and forwarded to the Cove Corporation 

 laboratory for species identification and enumeration. 



2.4 Sediment Sampling and Analysis 



Sediment samples were collected at each of the benthic 

 community stations to provide a baseline and to verify the nature 

 of material deposited at the disposal site. Samples were obtained 

 using a 0.1 m 2 Smith-Mclntyre grab sampler. Four polycarbonate 

 plastic core liners (6.5 cm ID) were pushed into each sediment grab 

 sample and extracted; the top 10 cm of sediment from three of these 



