APPENDIX B. 307 



8. Foundation. The lock will be built on : at an 



average depth of feet below the lower miter- sill level. The bottom of the con- 

 struction is shown on the drawings as. . . .feet below the lower miter -sill level; this must 

 be understood to be only approximate, as the character of the material encountered, 

 or other circumstances, may necessitate deeper or shallower foundations. 



9. Contract to Include. Any necessary cutting away of the bank above the upper 

 or below the lower cribs, to make the upper and lower approaches, will be done by the 

 United States and the cement will be furnished by the United States. With these 

 exceptions all material and labor, permanent or temporary, necessary to the entire 

 completion of the work, according to the true intent and meaning of these specifications, 

 will be included in this contract. The contractor, under his contract price, must 

 furnish and pay for all material of every description entering into or connected with 

 the temporary or permanent construction. He must also, under his contract price, 

 supply and pay for all labor, skilled or otherwise, required to grub and clear the site of 

 the lock and cribs, to prepare and place all materials, and to remove all debris after 

 completion of the work, and must furnish all necessary plant, tools, landings, derricks, 

 machinery, boats, and temporary buildings. 



10. Details. The details of the work shall conform to the drawings exhibited, 

 and to such others in explanation of details or modifications of plans as may be furnished 

 from time to time during the construction. Both the drawings exhibited and those 

 that may be furnished are to be considered as forming a part of these specifications. 

 These specifications are intended to be full and complete; any doubt as to their 

 meaning or any obscurity in the wording of them will be explained by the Engineer, 

 who shall have the right to correct any error or omission, whenever such correction is 

 necessary for the proper fulfillment of their intention. 



11. Investigation. It is expected that each person bidding will visit the site of 

 the lock and the office of the local engineer, and will ascertain the nature and location 

 of the ground, etc., the general character of the river as to floods and low water, and will 

 obtain all information necessary to enable him to make an intelligent proposal. In- 

 formation given bidders as to quarries will not be considered to bind the United States 

 to accept the output of such quarries. The quality of the material offered, and not its 

 source, will be the basis upon which it will be inspected and judged. 



COFFER-DAM. 



12. Plan. The United States will furnish plans for the coffer-dam, and it must 

 be built in accordance therewith, unless minor modifications are' desired by the con- 

 tractor or by the United States, and approved by the Engineer Officer. Its height 

 shall be as shown on the drawings. The foundation will be either on the rock or on 

 the overlying material, at the discretion of the Engineer. If founded on the rock, the 

 material above must be cleanly removed by dredging or otherwise. The ends of the 

 coffer-dam must be securely rooted in the bank, and protected with riprap as directed. 



