ANALYSIS FOR PIER14 

 (NCEL SAMPLE) 



STANDARD DEVIATION= 

 ORIGINAL STD DEV. = 



1.042 MEAN DIAMETER = 11.92 

 0.907 MEAN (ORIGINAL)= 12.05 



COEFFICIENT OF VARIATION (SAMPLE DIAMETER).. = 0.09 



COEFFICIENT OF VARIATION (ORIGINAL DIAMETER)= 0.08 



COEFFICIENT OF VARIATION FOR CROSS-SECTION = 0.17 



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



NUMBER OF PILES WITH DIAMETER MEASUREMENTS = 30 



PERCENTAGE OF PILES WITH BORER ACTIVITY = 20.0 



STANDARD ERROR OF PROPORTION = 7.3% 



INTERVAL PERCENT PERCENT CUMULATIVE 



(INCHES) NUMBER OBSERVED EXPECTED Z- VALUE PERCENT 



8 0.00 0.000 -3.2837 0.0000 



9 1 3.33 1.009 -2.3240 0.0100 



10 3 10.00 7.640 -1.3643 0.0865 



11 8 26.66 25.641 -.4046 0.3429 



12 14 46.66 36.740 0.5550 0.7103 



13 1 3.33 22.464 1.5147 0.9349 



14 3 10.00 5.832 2.4744 0.9932 



15 0.00 0.671 3.4341 1.0000 



TYPE OF 



AREA 



EQUIVALENT 



ESTIMATED 



MAINTENANCE 



REMAINING 



DIAMETER 



PERCENT 



NONE 



>95% 



>11.0 



79.4% 



WRAP 



75-95% 



9.8 - 11.0 



18.2% 



CONCRETE JACKET 



50-75% 



8.0 - 9.8 



2.2% 



REPLACEMENT 



<50% 



< 8.0 



0.0% 



C-10 



