Figure 4. DOSP Data Stations for Phase III Studies 



Penetration, recovery, percent recovery, length of sample in the laboratory 

 (after transportation) and percent settlement are as noted in Table 3. Opera- 

 tions at each station indicated involved preliminary sampling with Pheleger and 

 grab samplers, collection of a gravity core and anchoring for DOSP operations. 

 The latter were accomplished by initial operations in the water column, 20 feet 

 above the ocean floor, probe cycling and data acquisition in the sediment, DOSP 

 sampling of the sediment, recycling in the water column, and securing on deck 

 to move to the next station. Of the stations shown in Figure 4, only six were 

 analyzed in detail in this study. Four of the stations produced samples used 

 in an auxiliary core disturbance study, and two others proved too granular for 

 DOSP operations. All cores collected were velocity logged, described and sent 

 (courtesy USN) via air freight in dry ice to URI for further laboratory analysis, 



LABORATORY INVESTIGATIONS 



Routine laboratory tests following the procedures in Lambe (1961) were run on 

 all 2%" gravity and 3" DOSP cores returned to the laboratory. Nondestructive 

 tests included x-ray radiography for structure delineation and velocity logging. 

 At each foot level in the cores, representative samples were selected for tri- 

 axial shear strength tests and determination of general physical properties. 

 Table 4 summarizes the range, mean (x) , standard deviation, number of determina- 

 tions (n) and units used for all properties determined in situ and in the lab. 



I 



In Table 4, derived acoustic properties (Z,R,BL) are as defined in Bartberger 

 (1965) . Mineralogical identification was done by x-ray diffraction analysis 

 as described in Cullity (1967). 



VII-24 



