21 



TYPE Green Piles encased in concrete deposited inside of steel 

 shells composed of 3/16" boiler plate: 



Date 



Number of 



Structure Constructed Supports 



Boiler 



Foundations, 

 Ferry Bldg., & 

 Supports for 

 Upper Deck 

 Apron, N. side 

 Slip 4. 



1896- 

 1900 



17 



Condition 1921 



Inspected by diver. One cylin- 

 der has hole near mud line. Cyl- 

 inders utilized in reconstructing 

 concrete floor, in 1921. 



TYPE Holmes cylinder supports consisting of green pile clusters 

 surrounded by 3' to 4' concrete cylinders: 



Date Number of 

 Structure Constructed Supports Condition 1921 



Pier 19 1903 234 181 Cyl. removed 53 Cyl. re- 



main in good condition. 



Pier 21 1903 234 206 Cyl. removed 28 Cyl. re- 



main in good condition. 



Pier 23 1903 234 168 Cyl. removed 66 Cyl. re- 



main in good condition. 



Pier- 25 1903 273 172 Cyl. removed 101 Cyl. re- 



main in good condition. 



Pier 11 1905 490 440 Cyl. removed 50 Cyl. re- 



main in good condition. 



Pier 7 1903 486 353 Cyl. removed 153 Cyl. re- 



main in good condition. 



TYPE Holmes Pile consisting of single green pile encased in 

 concrete: 



Date Number of 

 Mrncture Constructed Supports 



Pier 34 



1919 



770 



Condition 1921 



All piles intact and giving satis- 

 factory service. Inspected on al- 

 ternate bents by diver with fol- 

 lowing results: 

 2.08% have pile exposed. 

 13.50% have minor defects such 

 as grooves 1" deep; 

 84.42% perfect. 



