92 STANDARD SPECIFICATIONS 



The test load shall be left on the part under test for 24 hours, 

 shall not cause a deflection exceeding one-four-hundred-and- 

 eightieth (TSTT) of the span, shall show no sign of cracks, and 

 shall leave no permanent deformation. 



Load tests shall not be made upon arches until after 90 days, 

 or upon other structures until after 60 days, of hardening. 



385. Erection: 



(a) Whenever the contractor is required to remove any 

 existing structure, to clear the site, or to excavate, such 

 requirements shall be specifically stated in the con- 

 tract. 



(6) Otherwise the erection shall include all necessary hauling, 

 the unloading of the materials and their proper care 

 until the completion and acceptance of the work, as 

 specified in Pars. 385c to 391. 



(c) The contractor shall furnish, at his own expense, all 

 necessary staging, falsework, materials, and tools, and 

 shall erect the structure complete and finish the same 

 as specified in the contract. (Par. 390.) 



386. Removal of Old Structure. Whenever new structures 

 are to replace existing ones the latter shall be carefully taken 

 down and removed by the contractor to some place specified 

 in the contract. 



387. Interruption of Traffic. All operations shall be so con- 

 ducted as not to impede or interrupt the work of other contrac- 

 tors, the traffic of any railroad, nor close any thoroughfare or 

 waterway, nor conflict with any law, regulation, or ordinance 

 of any properly constituted authority. 



388. Permits. Before commencing operations the contrac- 

 tor shall, at his own expense, obtain all necessary permits and 

 comply with their requirements. 



389. Safeguards and Damages. The contractor shall furnish, 

 at his own expense, all watchmen, guards, signals, night lights, 

 etc., for the prevention of accidents, and be responsible for the 

 safety of the structure; and he shall assume full responsibility 

 for all accidents to men, animals, and materials before the com- 

 pletion and final acceptance of the structure and shall indemnify 

 its owner for any and all claims for damages arising there- 

 from. 



390. Defective Work. The contractor shall, at his own 



