ANALYSIS FOR PIER12 

 (NCEL SAMPLE) 



STANDARD DEVIATION= 

 ORIGINAL STD DEV. = 



1.876 MEAN DIAMETER = 11.85 

 1.360 MEAN ( ORIGINAL )= 12.50 



COEFFICIENT OF VARIATION (SAMPLE DIAMETER).. = 0.16 

 COEFFICIENT OF VARIATION (ORIGINAL DIAMETER )= 0.11 

 COEFFICIENT OF VARIATION FOR CROSS-SECTION = 0.29 



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

 NUMBER OF PILES WITH DIAMETER MEASUREMENTS = 



30 

 30 



PERCENTAGE OF PILES WITH BORER ACTIVITY = 53.3 



STANDARD ERROR OF PROPORTION = 9.1% 



INTERVAL PERCENT PERCENT CUMULATIVE 



(INCHES) NUMBER OBSERVED EXPECTED Z-VALUE PERCENT 



5 1 3.33 0.000 -3.3867 0.0000 



6 0.00 0.222 -2.8538 0.0022 



7 1 3.33 0.795 -2.3208 0.0101 



8 0.00 2.676 -1.7879 0.0369 



9 0.00 6.808 -1.2550 0.1050 



10 4 13.33 13.031 -.7221 0.2353 



11 5 16.66 18.962 -.1891 0.4249 



12 7 23.33 20.932 0.3437 0.6343 



13 8 26.66 17.511 0.8766 0.8094 



14 4 13.33 11.113 1.4095 0.9205 



15 0.00 5.326 1.9425 0.9738 



16 0.00 1.950 2.4754 0.9933 



17 0.00 0.669 3.0083 1.0000 



TYPE OF 



AREA 



EQUIVALENT 



ESTIMATED 



MAINTENANCE 



REMAINING 



DIAMETER 



PERCENT 



NONE 



>95% 



>11.0 



66.3% 



WRAP 



75-95% 



9.8 - 11.0 



19.5% 



CONCRETE JACKET 



50-75% 



8.0 - 9.8 



11.9% 



REPLACEMENT 



<50% 



< 8.0 



2.1% 



C-f 



