ANALYSIS FOR PIER11 

 (NCEL SAMPLE) 



STANDARD DEVIATION= 

 ORIGINAL STD DEV. = 



0.920 MEAN DIAMETER = 12.07 

 0.677 MEAN (ORIGINAL)= 12.32 



COEFFICIENT OF VARIATION (SAMPLE DIAMETER).. = 0.08 



COEFFICIENT OF VARIATION (ORIGINAL DIAMETER)= 0.05 



COEFFICIENT OF VARIATION FOR CROSS-SECTION = 0.15 



TOTAL NUMBER OF PILES INSPECTED (LEVEL I&II)= 30 



NUMBER OF PILES WITH DIAMETER MEASUREMENTS = 30 



PERCENTAGE OF PILES WITH BORER ACTIVITY = 36.6 



STANDARD ERROR OF PROPORTION = 8.7% 



INTERVAL PERCENT PERCENT CUMULATIVE 



(INCHES) NUMBER OBSERVED EXPECTED Z-VALUE PERCENT 



8 0.00 0.000 -3.8820 0.0000 



9 1 3.33 0.264 -2.7951 0.0026 



10 1 3.33 4.123 -1.7082 0.0438 



11 7 23.33 22.352 -.6213 0.2674 



12 15 50.00 41.166 0.4655 0.6790 



13 5 16.66 26.042 1.5524 0.9394 



14 1 3.33 5.627 2.6393 0.9957 



15 0.00 0.422 3.7262 1.0000 



TYPE OF 



AREA 



EQUIVALENT 



ESTIMATED 



MAINTENANCE 



REMAINING 



DIAMETER 



PERCENT 



NONE 



>95% 



>11.0 



86 . 3% 



WRAP 



75-95% 



9.8 - 11.0 



12.9% 



CONCRETE JACKET 



50-75% 



8.0 - 9.8 



0.7% 



REPLACEMENT 



<50% 



< 8.0 



0.0% 



C-6 



