ANALYSIS FOR PIER11 

 (NCEL SAMPLE) 

 (PROPORTION) 



STANDARD DEVIATION= 

 ORIGINAL STD DEV. = 



1.196 MEAN DIAMETER = 11.92 

 1.112 MEAN (ORIGINAL)= 12.18 



COEFFICIENT OF VARIATION (SAMPLE DIAMETER).. = 0.10 

 COEFFICIENT OF VARIATION (ORIGINAL DIAMETER)= 0.09 

 COEFFICIENT OF VARIATION FOR CROSS-SECTION = 0.19 



TOTAL NUMBER OF PILES INSPECTED (LEVEL I&II)= 

 NUMBER OF PILES WITH DIAMETER MEASUREMENTS = 



PERCENTAGE OF PILES WITH BORER ACTIVITY 

 STANDARD ERROR OF PROPORTION = 



96 



39 



37.5 



4.9% 



INTERVAL PERCENT PERCENT CUMULATIVE 



(INCHES) NUMBER OBSERVED EXPECTED Z-VALUE PERCENT 



7 





0.00 



0.000 



-3.7014 



0.0000 



8 





0.00 



0.214 



-2.8655 



0.0021 



9 



1 



2.56 



1.920 



-2.0296 



0.0213 



10 



6 



15.38 



9.504 



-1.1937 



0.1163 



11 



12 



30.76 



24.402 



-.3578 



0.3604 



12 



7 



17.94 



32.316 



0.4780 



0.6835 



13 



10 



25.64 



22.185 



1.3139 



0.9054 



14 



3 



7.69 



7.865 



2.1498 



0.9840 



15 





0.00 



1.451 



2.9857 



0.9986 



16 





0.00 



0.138 



3.8216 



1.0000 



TYPE OF 



AREA 



EQUIVALENT 



ESTIMATED 



MAINTENANCE 



REMAINING 



DIAMETER 

 >11.0 



PERCENT 



NONE 



>95% 



76.4% 



WRAP 



75-95% 



9.8 - 11.0 



19.4% 



CONCRETE JACKET 



50-75% 



8.0 - 9.8 



4.0% 



REPLACEMENT 



<50% 



< 8.0 



0.0% 



C-7 



