24_ 



buoy B (Figure 3-12). The dredged material released at buoy location B, and detected in the 

 REMOTS® survey, was fine-grained material from the North Cove project. At the disposal 

 buoy location, very little sand covered the fresh dredged material (Plate 3-1). At 

 progressively greater distances from the center of the disposal mound, a layer of sand 

 covered the dredged material (Plate 3-2). This sand layer appeared to thicken with distance 

 from the mound center (Figure 3-13). An exception was REMOTS® Station D3 where fresh 

 dredged material was found with little or no sand cover. The presence of sand at a 

 REMOTS® station limited the penetration depth of the camera prism. If there were areas in 

 this REMOTS® survey where more than 4 to 5 cm of sand covered finer grained material, 

 the camera did not penetrate the sediment far enough to detect it. 



The ambient sediment detected in the REMOTS® photographs was either fine sand of 

 a uniform grain size, or coarser sand with shell fragments and pebbles. The photographs of 

 the fine sand sediment showed bedforms, or sand ripples, but there were no visible 

 macrofauna (Plate 3-3). The sand ripples, approximately 1 to 3 cm in height, were 

 concentrated south of 41° 12. 75' N. REMOTS® photographs of the coarser grained sands . 

 contained shell fragments and pebbles with hydroids (Plate 3-4). The presence of hydroids 

 on lag surfaces of shell and gravel was noted for an area approximately 2 nmi southwest of 

 the disposal site in May 1987 (Fenster et al. 1990). Except for Station C13, sand ripples and 

 shell fragment were mutually exclusive. 



Synthesis of Monitoring Surveys at the Cornfield Shoals Disposal Site, July 1991 to May 1992 



