consequently, further surveying is required to evaluate the viability of acoustic 

 spoil detection. Sediment samples taken from the area confirm the presence 

 of rocks, timbers and building materials at this location. 



Future bathymetric surveying at these sites will be drastically reduced 

 in area! coverage. Coordinations with the Corps of Engineers permits and con- 

 tracting branches should allow point dumping at these sites and acoustic moni- 

 toring of future spoil disposal should be possible. 



Currents 



A current meter was installed at the Boston Foul Ground on May 23, 1978, 

 that recorded data for forty-eight days until 10 July, 1978 (Fig.D-7(a-d)) . Al- 

 though speed information was obtained, the direction sensor was inoperable for 

 the entire record. Consequently, the motion ellipses and other calculations for 

 these data are not meaningful. The reliability of the speed may be doubtful 

 as well since the direction problem may have; resulted from fouling of the meter. 

 The values of speed do look reasonable and conslstant, however, and are presented 

 in Table D-1 for general information. 



The value of 11.35 dynes/sec for horizontal kinetic energy at the Foul 

 Ground is extremely low and indicative of a non-tidal flow area. The highest 

 10% speed of 14 cm/sec is also low and, if real, indicates that currents would 

 not be sufficient to disperse spoils. Studies with the BOLT system would be 

 important in this area to evaluate the effect of waves and swell on the bottom 

 sediments . 



No current meter has yet been placed at the Lightship disposal site. 



