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work or material as may be deemed advisable, by adding thereto or
deducting therefrom at the unit price of the contract. Should any
change be made in a particular piece of work after it has been
commenced, so that the contractor is put to extra expense, the
engineer will make reasonable allowance therefor, which action shall be
binding on both parties. Extra work or material shall be charged for
as hereinafter provided.

20. INSPECTION OF WORK.- The duly authorized engineers and
inspectors of the City of Fort Worth shall at times have the right
to inspect the work and materials. The contractor shall furnish such
persons reasonable facilities for obtaining such information as they
desire respecting the progress and manner of the work and the
character of the material.

21. REMOVAL OF DEFECTIVE WORK.- The contractor shall remove
and rebuild at his own expense any part of the work that has
been improperly executed, even though such work has already been includ-
ed in the monthly estimates. If the contractor refuses or neglects
to replace such defective work it may be replaced by the City of
Fort Worth at the contractor's expense.

22. PROTECTION OF WORJ AND CLEANING UP.- The contractor will
be held responsible for the care o f all work until final completion
and acceptance, and he will be required to make good at his own
cost any damage or injury it may sustain from any cause. He shall
take all risks from floods and causalities of every description and
make no charge for detention from such causes. He may, however, be
allowed a reasonable extension of time on account of such detention
subject to the conditions hereinbefore specified. Rubbish and unused
material must be removed from the vicinity of the completed work.

23. ERRORS AND OMMISSIONS.- The contractor will not be
allowed to take advantage of any error or ommission in these speci-
ficatons. Full instructions will always be given when such error or
is discovered.

24. ROADS. All roads subject to interferences from the work