ANALYSIS FOR PIER13 

 (NCEL SAMPLE) 



STANDARD DEVIATION= 

 ORIGINAL STD DEV. = 



1.643 MEAN DIAMETER = 12.00 

 1.536 MEAN (ORIGINAL)= 12.98 



COEFFICIENT OF VARIATION (SAMPLE DIAMETER).. = 0.14 

 COEFFICIENT OF VARIATION (ORIGINAL DIAMETER)= 0.12 

 COEFFICIENT OF VARIATION FOR CROSS-SECTION = 0.26 



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

 NUMBER OF PILES WITH DIAMETER MEASUREMENTS = 



30 

 30 



PERCENTAGE OF PILES WITH BORER ACTIVITY = 46.6 



STANDARD ERROR OF PROPORTION = 9.1% 



INTERVAL PERCENT PERCENT CUMULATIVE 



(INCHES) NUMBER OBSERVED EXPECTED Z-VALUE PERCENT 



6 1 3.33 0.000 -3.3492 0.0000 



7 0.00 0.313 -2.7408 0.0031 



8 0.00 1.347 -2.1324 0.0166 



9 0.00 4.731 -1.5240 0.0639 



10 0.00 11.621 -.9156 0.1801 



11 12 40.00 19.925 -.3072 0.3793 



12 9 30.00 23.894 0.3011 0.6183 



13 4 13.33 19.999 0.9095 0.8183 



14 3 10.00 11.702 1.5179 0.9353 



15 0.00 4.780 2.1263 0.9831 



16 1 3.33 1.365 2.7347 0.9968 



17 0.00 0.318 3.3431 1.0000 



TYPE OF 



AREA 



EQUIVALENT 



ESTIMATED 



MAINTENANCE 



REMAINING 



DIAMETER 



PERCENT 



NONE 



>95% 



>11.0 



71.6% 



WRAP 



75-95% 



9.8 - 11.0 



19.0% 



CONCRETE JACKET 



50-75% 



8.0 - 9.8 



8.5% 



REPLACEMENT 



<50% 



< 8.0 



0.7% 



C-9 



