CONCLUSIONS AND RECOMMENDATIONS 



1. The facility condition assessment in the Specialized Inspection Program 

 is adequate to project maintenance and repair needs. No additional data 

 are required. 



2. Predictions made from either the normal or Weibull distribution functions 

 were more accurate (within 5 percent of the actual requirement) than the 

 simple ratio method and should be used for estimating maintenance and repair 

 projects . 



3. Reducing the confidence interval by 35 percent requires three times the 

 number of samples. For a pier in good condition, it is probably not worth 

 the additional expense of gathering these extra samples. 



4. Stratification of a facility will usually increase the precision and 

 reduce sample size requirements. Perform the following steps to stratify 

 a facility: 



a. Divide the facility into four categories by pile function: 



(1) fender piles, (2) perimeter piles, (3) batter piles, and (4) interior- 

 bearing piles. 



b. When partitioning the structure, consider the date of construction 

 of different parts of the facility or maintenance of a significant portion 

 of the facility. 



c. Consider the load bearing capacity of the piles. Segregate those 

 piles that support a structure, trackage, or other exceptional live or dead 

 load from the remainder of the structure for analysis. 



d. Use the systematic approach for selecting samples for individual 

 pile and bulkhead structures. The systematic approach is the easiest 

 method for selecting inspection samples. It provides a more "even" cover- 

 age over the length and width of the facility and allows the selection of 

 piles or stations that take into account the redundant type of construction 

 methods and the character of waterfront structure usage and exposure. 



REFERENCES 



1. Naval Facilities Engineering Command, Chesapeake Division. FP0-1-81(25) : 

 Underwater inspection program status report. Washington, D.C., Dec 1981. 



2. Naval Civil Engineering Laboratory. Contract Report: Technical support 

 for development of inspection sampling criteria. Ventura, Calif., Western 

 Instrument Corp., Aug 1983. 



3. . Technical Note N-1624: Underwater inspection of water- 

 front facilities: Inspection requirements analysis and nondestructive 

 testing technique assessment, by R.L. Brackett et al. Port Hueneme , Calif., 

 Mar 1982. 



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