11 



relationship with natural causes such as wind or rain storms. We can only speculate that 

 there must have been other undocumented anthropogenic activities or discharges that may 

 have perturbed the ambient concentration field. 



5.0 CONCLUSIONS 



The variety of data provided by DAISY and the echo sounder surveys indicate that 

 dredging operations resulted in the transport of some amount of suspended material into the 

 shoal areas flanking the navigational channel. At the DAISY site, this transport served to 

 increase suspended material concentrations for a short period of time to maxima approaching 

 100 mg-r\ an order of magnitude greater than ambient concentrations measured prior to 

 dredging operations. The effects of these perturbations on regional water quality and/or 

 benthic habitat must be evaluated relative to the effects of the larger amplitude, more 

 persistent perturbations produced by the combination of wind waves and outfalls. The 

 DAISY observations suggest that, against these latter factors, dredge-associated resuspension 

 represents a smaller amplitude and shorter duration perturbation. 



Dredged Sediment Dispersion in New Haven Harbor 



