Chief of Operations Division 

 National Ocean Survey, NOAA 

 1439 W. York Street 

 Norfolk, VA 23510 



Naval Oceanographic Office 



Code 3100 



National Space Technology Laboratories 



NSTL Station, MS 39522 



Scripps Institution of Oceanography 

 La JoUa, CA 92093 



Chief Atlantic Branch of Marine Geology 

 United States Geological Survey 

 Bldg 13 



Quissett Campus 

 Woods Hole, MA 02543 



Chief Pacific Arctic Branch of Marine 



Geology 

 United States Geological Survey 

 345 Middle Road 

 Menlo Park, CA 94025 



Woods Hole Oceanographic Institution 

 Woods Hole, MA 02543 



2.4 HAZARDOUS/UNUSUAL CONDITIONS 



The procedures presented herein assume the use of ordinary 

 conditions to achieve a degree of simplicity. When conditions are out of 

 the range for the assumed conditions, caution is necessary. These 

 cases are termed hazardous/unusual. Satisfactory designs are still 

 possible, but they require reference to the more detailed procedures 

 given in the references listed in Section 1.3. A hazardous/unusual 

 condition exists when any of the following are true. 



(a) Bedrock or rock pieces larger than gravel size present at 

 depths less than fluke penetration. 



(b) Soil type changes significantly or there are major layers of 

 different soil types. 



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