112 - 



Once at the site, originally marked by a buoy, the instrument 

 was lowered into the water. Divers maneuvered t"lie instrument between 

 the two rear legs of the CRAB to the seafloor, detached the lines 

 from the CRAB to the cradle and cable, and the CRAB drove away a 

 short distance. A four-foot screw anchor was turned into the sandy 

 bottom approximately three and a half feet from the end of each arm 

 and chain was attached from each arm to its respective screw anchor. 

 The chains were secured taut by a chain binder and each rested at 

 about a 45 degree angle to the seafloor. A fifth screw anchor and 

 buoy was next installed twenty feet away from the DPG and a heavy 

 line secured between this anchor and the cradle. Satisfied with the 

 instrument installation, the buoys were released from the cable and 

 work commenced at the pier. 



The cable had to be secured under the pier and prevented from 

 chafing on the cement piling jackets. The cable descended from the 

 pier deck inside a stainless steel case along the northeastern-most 

 piling. A steel cable was looped around the base of this piling and 

 attached to a wire jacket that cinched the cable under tension. To 

 prevent chafing about the south pilings among which the cable passed, 

 a long pipe was jetted between the two southeastern-most pilings and 

 a similar steel line and wire jacket attached between the pipe and 

 cable. The cable began to bury itself into the sand within hours of 

 the deployment. 



