APPENDIX B. 



333 



may be taken as sufficient cause for annulment of this contract, as provided for in -the 

 form of contract to be entered into or for action under the provisions of these specifica- 

 tions, as the best interests of the United States may demand. 



68. Annulment of Contract. In case of annulment of this contract the United 

 States shall have the right to retain all materials, tools, buildings, tramways, cars, 

 etc., or any part or parts of same prepared for or in use in the prosecution of the work, 

 together with any or all leases, rights of way or quarry privileges, under purchase, at a 

 valuation to be determined by the Engineer. 



69. Removal of Rubbish. Within thirty days after completion of the work, -and 

 before the final payment is made, the contractor shall remove from the site all rubbish, 

 old and unused material, piles, cribs, etc., and shall fill up all excavations made for 

 his convenience, as the Engineer shall direct, and shall leave the whole site thoroughly 

 clean and in good order and condition, without expense to the United States. 



70. Special Labor to be Supplied. The contractor shall furnish, when required by 



the Engineer, at the fixed prices of cents per man per hour for unskilled labor, 



and of cents per man per hour for skilled labor, all the labor necessary for carrying 



out such special work as may be required by the Engineer, and which is not covered 

 in other clauses of this contract. 



71. Complete Work Required. The contractor is not to take advantage of any 

 omission of details in drawings or specifications, or errors in either, but he will be required 

 to do everything which may be necessary to carry out in good faith this contract, 

 which contemplates complete structures, in good working order, of good material, and 

 accurate workmanship, skillfully fitted and properly connected and put together. Any 

 point not clearly understood is to be referred to the Engineer for decision. 



72. Changes. Should any changes in the details of the work, or any of its parts, 

 including any changes of the shape, arrangement, or fitting of the parts, be deemed 

 necessary or advisable, and be ordered by the Engineer before these details or parts 

 have been finished, the changes must be made by the contractor at the same unit 

 prices as those of the bid ; but anything which materially increases the cost of the work 

 is not to be done until first ordered in writing by the Engineer Officer. . 



73. Damage to Vessels. The contractor shall be responsible for all damages or 

 injury caused by the permanent or temporary works to any vessels, steamboats, tows, 

 barges, etc., during the continuance of his contract. In no case will the United States 

 defend any suit brought for such damages inflicted before the works have been finally 

 accepted by the United States. Any injury to the works by such vessels, etc., while 

 the works are in the hands of the contractor, and before delivery to the United States, 

 shall be repaired by the contractor to the satisfaction of the Engineer, without expense 

 to the United States. 



74. Lighting Work. From sunset to sunrise the work shall be properly lighted 

 to prevent accident to boats navigating the river. The lighting shall be done by the 



