ANALYSIS FOR PIER11 

 (FPO-1 SAMPLE) 



STANDARD DEVIATION= 

 ORIGINAL STD DEV. = 



1.035 MEAN DIAMETER = 11.99 

 0.907 MEAN (ORIGINAL)= 12.23 



COEFFICIENT OF VARIATION (SAMPLE DIAMETER).. = 0.09 



COEFFICIENT OF VARIATION (ORIGINAL DIAMETER)= 0.07 



COEFFICIENT OF VARIATION FOR CROSS-SECTION = 0.17 



TOTAL NUMBER OF PILES INSPECTED (LEVEL I&II)= 174 



NUMBER OF PILES WITH DIAMETER MEASUREMENTS = 117 



PERCENTAGE OF PILES WITH BORER ACTIVITY = 38.5 



STANDARD ERROR OF PROPORTION = 3.6% 



INTERVAL PERCENT PERCENT CUMULATIVE 



(INCHES) NUMBER OBSERVED EXPECTED Z-VALUE PERCENT 



8 0.00 0.000 -3.3738 0.0000 



9 2 1.70 0.804 -2.4077 0.0080 



10 11 9.40 6.692 -1.4416 0.0749 



11 35 29.91 24.237 -.4755 0.3173 



12 41 35.04 37.076 0.4906 0.6881 



13 23 19.65 23.903 1.4567 0.9271 



14 5 4.27 6.511 2.4228 0.9922 



15 0.00 0.774 3.3889 1.0000 



TYPE OF 



AREA 



EQUIVALENT 



r 



ESTIMATED 



MAINTENANCE 



REMAINING 



DIAMETER 





PERCENT 



NONE 



>95% 



>11.0 





81.4% 



WRAP 



75-95% 



9.8 - 11. 



,0 



16.6% 



CONCRETE JACKET 



50-75% 



8.0 - 9. 



,8 



1.9% 



REPLACEMENT 



<50% 



< 8.0 





0.0% 



C-2 



