The final estimate shall include all work of every description done and all materials furnished by the contractor under the contract. All questions as to estimates, measurements or the determination of the quantity or quality of work shall be left to the discretion of the Deputy Service Director/Superintendent of Engineering. Labor or material furnished outside the provisions of such contract shall not be paid for unless such labor or material has been ordered by the Deputy Service Director/Superintendent of Engineering in writing by change order and approved by the contractor. (Ord. 2002-106. Passed 11-06-02)