15_ 



Additional sediment chemistry data are available through NED for the core samples 

 and replicate sample data. Sampling and analytical work were contracted to HMM 

 Associates, Incorporated, Concord, Massachusetts. Methods used for grain size, TOC, 

 and metals were not provided; however, PAHs were analyzed by EPA Method 8270, and 

 chlorinated pesticides and total PCBs by EPA Method 8080. Bioassay studies were 

 conducted by SP, Incorporated, Salem, MA. Skinners and Sherman, Waltham, MA, 

 conducted the bioaccumulation tissue analysis. Cadmium, copper, and zinc were analyzed 

 in the tissue following EPA Methods 3051, 6010, and 7131. Pesticides were analyzed by 

 Method 8080 and PAHs by Method 8270. 



2.4 Disposal and Capping Operations 



The Great Lakes Dredge and Dock Company conducted the dredging operations in 

 New Haven Harbor with Clamshell Dredge 54. Disposal and capping at CLIS were 

 achieved with the use of Great Lakes' 4000 yd 3 disposal barges 32 and 33 and Towing 

 Vessels (T/V) Arthur F. Zeman, Jr. and Delmur C. Lynn. Additional disposal work was 

 performed by Gateway Towing, Inc. T/V Outrageous and United Towing, Inc. T/V Terror 

 during the New Haven Capping Project. 



2.4.1 Disposal of UDM 



Of the total volume of UDM (590,226 m 3 ), approximately 500,369 m 3 was dredged 

 from the inner federal navigation channel. During the month of October 1993, 

 approximately 460,083 m 3 from the inner channel was deposited at the NHAV buoy 

 (Appendix B Table 1). The remaining 40,286 m 3 were deposited at disposal point I, 

 located southwest of the buoy (41°09.000' N and 72°53.525' W) (Figure 2-2). UDM 

 from the private dredging projects totaling 89,857 m 3 was also deposited at disposal point I 

 from 3 December 1993 to 8 January 1994 (Appendix B Table 1). This allowed capping to 

 begin on the northern side of the mound while contaminated sediments were disposed on 

 the southern side of the mound. 



2.4.2 Capping Operations 



In addition to the use of the DAMOS capping model (which was not designed for 

 large volume dredged material projects such as the New Haven capping project because it 

 has a tendency to create unrealistically high central mound heights) capping operations 

 were designed using a simple geometric analysis of volume and potential cap thickness. It 

 was predicted that the dredged material would be placed in a berm-shaped mound 

 approximately 5 m high, 250 m wide, and 608 m long including the thin flanks. The total 

 areas to be covered by the cap material would need to extend 50 m beyond these 



Monitoring Surveys of the New Haven Capping Project, 1993-1994 



