ANALYSIS FOR PIER12 

 (FPO-1 SAMPLE) 



STANDARD DEVIATION= 1.528 MEAN DIAMETER = 12.34 



ORIGINAL STD DEV. = 1.247 MEAN (ORIGINAL)= 12.63 



COEFFICIENT OF VARIATION (SAMPLE DIAMETER).. = 0.12 



COEFFICIENT OF VARIATION (ORIGINAL DIAMETER)= 0.10 



COEFFICIENT OF VARIATION FOR CROSS-SECTION = 0.23 



TOTAL NUMBER OF PILES INSPECTED (LEVEL I&II)= 231 



NUMBER OF PILES WITH DIAMETER MEASUREMENTS = 147 



PERCENTAGE OF PILES WITH BORER ACTIVITY = 47.1 



STANDARD ERROR OF PROPORTION = 3.2% 



INTERVAL PERCENT PERCENT CUMULATIVE 



(INCHES) NUMBER OBSERVED EXPECTED Z-VALUE PERCENT 



5 1 0.68 0.000 -4.4793 0.0000 



6 0.00 0.000 -3.8252 0.0000 



7 1 0.68 0.000 -3.1712 0.0000 



8 0.00 0.594 -2.5171 0.0059 



9 4 2.72 2.541 -1.8631 0.0313 



10 8 5.44 8.208 -1.2090 0.1134 



11 32 21.76 17.624 -.5549 0.2896 



12 41 27.89 24.973 0.0990 0.5394 



13 30 20.40 23.456 0.7531 0.7739 



14 23 15.64 14.621 1.4071 0.9202 



15 7 4.76 5.999 2.0612 0.9802 



16 0.00 1.643 2.7152 0.9966 



17 0.00 0.336 3.3693 1.0000 



TYPE OF 



AREA 



EQUIVALENT 



ESTIMATED 



MAINTENANCE 



REMAINING 



DIAMETER 

 >11.0 



PERCENT 



NONE 



>95% 



79.8% 



WRAP 



75-95% 



9.8 - 11.0 



15.0% 



CONCRETE JACKET 



50-75% 



8.0 - 9.8 



4.7% 



REPLACEMENT 



<50% 



< 8.0 



0.2% 



C-3 



