ANALYSIS FOR PIER13 

 (FPO-1 SAMPLE) 



STANDARD DEVIATION= 

 ORIGINAL STD DEV. = 



1.546 MEAN DIAMETER = 11.99 

 1.516 MEAN (ORIGINAL)= 12.44 



COEFFICIENT OF VARIATION (SAMPLE DIAMETER).. = 0.13 



COEFFICIENT OF VARIATION (ORIGINAL DIAMETER)= 0.12 



COEFFICIENT OF VARIATION FOR CROSS-SECTION = 0.24 



TOTAL NUMBER OF PILES INSPECTED (LEVEL I&II)= 369 



NUMBER OF PILES WITH DIAMETER MEASUREMENTS = 185 



PERCENTAGE OF PILES WITH BORER ACTIVITY = 72.8 



STANDARD ERROR OF PROPORTION = 2.3% 



INTERVAL PERCENT PERCENT CUMULATIVE 



(INCHES) NUMBER OBSERVED EXPECTED Z-VALUE PERCENT 



6 1 0.54 0.000 -3.5534 0.0000 



7 4 2.16 0.185 -2.9066 0.0018 



8 3 1.62 1.012 -2.2599 0.0119 



9 3 1.62 4.147 -1.6131 0.0534 



10 10 5.40 11.377 -.9663 0.1672 



11 49 26.48 20.750 -.3196 0.3747 



12 68 36.75 25.333 0.3271 0.6280 



13 22 11.89 20.659 0.9739 0.8346 



14 21 11.35 11.263 1.6206 0.9473 



15 2 1.08 4.094 2.2674 0.9882 



16 2 1.08 0.992 2.9141 0.9981 



17 0.00 0.181 3.5609 1.0000 



TYPE OF 



AREA 



EQUIVALENT 



ESTIMATED 



MAINTENANCE 



REMAINING 



DIAMETER 



PERCENT 



NONE 



>95% 



>11.0 



72.6% 



WRAP 



75-95% 



9.8 - 11.0 



19.2% 



CONCRETE JACKET 



50-75% 



8.0 - 9.8 



7.5% 



REPLACEMENT 



<50% 



< 8.0 



0.5% 



C-4 



