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may be annulled and the contract let to the next most desirable
bidder in the opinion of the Mayor and Board of Commissioners; and
such bidder shall fulfill every stipulation embraced herein as if he
were the original party to whom the award was made. A copy of the
advertisement, proposal, general conditions and detail specifications
will be attached to and from part of the contract.

5. CONTRACTOR'S BOND. - Unless a different sum is specified in
the notice to bidders or the proposal, the contractor shall furnish
a bond in the sum of twenty per sent of the estimated aggregated
payments to be made under the contract, conditioned upon the faith-
ful performance by the contractor of all the convnants, stipulations
and agreements in the contract. If at any time during the continu-
ance of the contract the sureties, or any of them shall die, or, in
the opinion of the Mayor and Board of Commissioners shall have the right
to require additional and sufficient sureties, which the contractor
shall furnish to the satisfaction of those officers within ten days
after notice, and indefault thereof the contract may be suspended by
the Mayor and Board of Commissioners and the work completed as pro-
vided in paragraph 20.

6. ENGINEER. - The word "engineer" used in these specifications
or in the contract, unless qualified by the context, means
the city Engineer of the City of Fort Worth, Texas. He will be re-
presented on the work by assistants and inspectors with authority to
act for him and direct the work. Upon all questions concerning the
execution of the work, the classfication of material in accordance
with the specifications and the determination of costs, the decis-
ion of the City Engineer shall be binding on both parties.

7. CONTRACTOR.- The word "contractor" used in these specificat-
ions or in the contract means the person, firm or corporation with
whom the contract is made by the City of Fort Worth. The contractor
shall give his personal attention to the faithful prosecution of the
work and shall keep the same under his personal control. During the
absense of the contractor from the work his foreman or a designat-