±5 feet with reference to the closest international geodetic network location 

 point. With such a system used in conjunction with a submersible survey 

 vehicle, the many inaccuracies, doubts, and questionable data obtained by 

 conventional surface systems can be eliminated. 



SITE PARAMETERS 



Although many data about a particular location are required in site 

 survey operations, only the parameters of major importance to designing, 

 constructing, operating, and maintaining a bottom structure have been con- 

 sidered in this study. 



The following are considered to be the significant site factors for 

 ocean bottom installations: 



Foundation Engineering Data 



Shear strengths 



Consolidation characteristics 



Index properties (density, void ratio, grain size distribution, etc.^ 



Sediment thickness 



Compaction characteristics 



Geological Oceanographic Parameters 



Bottom topography 



Subbottom structure (faults, joints, discontinuities, bedding, 

 depth to bedrock) 



Sediment type 



Seismic activity 



Sediment transport (mass movements, turbidity currents, 

 scour and fill) 



Physical and Chemical Oceanographic Parameters 



Currents and tides 

 Temperature 

 Salinity 

 Sound velocity 

 Light transmissibility 



