program to study transfer and concentration at higher levels in the food chain will be 

 introduced if significant body burdens are encountered. 



DISPOSAL OPERATIONS PROCEDURES 



Several requirements must be imposed in the disposal operation to enhance the 

 probability of successful data acquisition. Most of these requirements are designed to 

 increase the precision of disposal (and therefore the potential for successful capping) because 

 the volumes of material under consideration in this project are so small. Prior to initiation of 

 dredging, two buoys will be installed at the points designated for disposal. The buoys will 

 be set on taut-wired moorings which will restrict their motion to radii of less than 10 meters. 

 Disposal will occur 25 meters south of these buoys. The tug will bring the scow alongside 

 whenever possible and disposal will always occur with the scow headed against the current. 

 If the scow must remain underway due to weather condition, the dump will be made in two 

 passes with the scow dumping the inside sections on one pass and fore and aft compartments 

 on the second pass. Two-thirds of the Stamford material will be dumped south of the south 

 buoy. The remainder will be dumped south of the north buoy. 



All of the mud from New Haven will be dumped at the south site using the same 

 disposal procedures upon completion of the Stamford portion of the project. The sand from 

 New Haven will be dredged and similarly dumped south of the north buoy to complete the 

 project. 



PHYSICAL AND CHEMICAL MEASUREMENTS 



Bathymetric surveys will be made using a state of the art Bathymetric Data 

 Acquisition System (BDAS) to determine condition, spoil distribution following disposal of 

 Stamford material, spoil distribution following disposal of New Haven material and 

 subsequent changes in distribution with time. Surveys will be made prior to initiation of 

 dredging with 25 meter lane spacing over 600 x 600 meter areas centered at the designated 

 disposal points. The surveys will provide baseline data for calculations used for the 

 construction of spoil distribution charts and volume determinations. Future surveys will be 

 run over the same transects used to develop the baseline data with a horizontal precision of 

 +5 meters, and vertical profiles will be measured to ascertain the presence of spoil material. 

 Contour charts and depth difference charts will be developed after each survey to determine 

 the location and thickness of spoil deposits, and volume calculations will be made to 

 determine the amount of spoil material at the disposal locations. 



The 24 kHz fathometer system employed by the BDAS system will be supplemented 

 by a dual frequency fathometer utilizing both a 300 kHz transducer for precision surface 

 determination, and a 7.5 kHz transducer for sub-bottom penetration. This system may be 

 particularly useful in measuring the coverage of spoils on the sand pile but may have 

 restricted use in evaluating the mud capping. 



The bathymetric data will provide important information on the areal distribution of 

 spoils and will be the only information to ascertain the volumes of material present. These 



