1.0 INTRODUCTION 



Maintenance dredging of the east end of the Cape Cod Canal and 

 improvement dredging of the East Mooring Basin were conducted by the U.S. Army 

 Corps of Engineers during the spring of 1990. The dredged material from this 

 project was released at two locations. The fine grained dredged material (15,296 m 5 ) 

 was brought to the Cape Cod Canal Disposal Site (CCDS) and the sandy sediments 

 (87,628 m s ) were released off Springhill Beach. The CCDS is located in Cape Cod 

 Bay approximately 3 nm northeast of Cape Cod Canal Buoy #1 (Figure 1-1). This site 

 consists of a 1 nm diameter circle centered at 41° 49'N and 70° 25'W. Presently 

 not considered a regional site, CCDS has been used periodically for canal and other 

 dredging operations. The Springhill Beach site is located in East Sandwich, MA at 

 approximate mean low water (MLW) depths of 4.5 to 10.5 m. The Springhill Beach 

 site is 3.5 nm south southwest of CCDS (Figure 1-1). 



Predisposal field operations began 19 March 1990 with the deployment of two 

 marker buoys at the Springhill Beach Site and one buoy within CCDS. A predisposal 

 bathymetric survey was done at CCDS on 22 March 1990, and at the Springhill 

 Beach Site on 23 March 1990. After the dredged material was released at the sites, 

 postdisposal surveys were conducted on 24 April at CCDS and on 24 and 25 April at 

 Springhill. The pre- and postdisposal bathymetric surveys were conducted to 

 determine changes in bathymetry due to the recent disposal. 



An historic disposal mound exists at CCDS. It was most likely formed by the 

 disposal of 228,735 m 5 of dredged material in 1980. A fifteen station REMOTS® 

 sediment-profile photographic survey was conducted across the apex of this mound 

 on 25 April to assess its infaunal recolonization status. 



Monitoring Cruise at the Cape Cod Canal Disposal Site and Springhill Beach Site 



