Repository: UIHistories Project: Planning Report - Sidewalks 1928 [PAGE 11]

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20. Changes in Work The Owner, without invalidating the Contract, may make changes by altering, adding to, or deducting from the work, the contract sum being adjusted accordingly. All such work shall be executed under the conditions of the original contract except that any claim for extension of time caused thereby shall be adjusted at the time of ordering such change. The Contractor shall not do any work which is not called for by the plans and specifications except on receipt of written authorization from the Supervising Architect and no claim for an addition to the contract sum shall be valid unless so ordered. The value of any such change shall be determined in one or more of the following ways: (a) By estimate and acceptance in a lump sum. (b) By unit prices named in the contract or subsequently agreed upon. (c) By actual material and labor cost to the Contractor, plus an allowance of ten percent of material cost and fifteen percent of labor cost as Contractor's overhead expense and profit. (d) If none of the above methods can be agreed upon, the Contractor, provided he receive an order as above, shall proceed with the work, no appeal to arbitration being allowed from such order to proceed. In this case the determination of the amount of extra shall be determined by arbitration. In cases (c) and (d) the Contractor shall keep and present in such form as the Supervising Architect may direct, a correct account of the net cost of labor and materials, together with vouchers. 21. Claims for Extras If the Contractor claims that any instructions, by drawings or otherwise, involve extra cost under this contract, he shall give the Supervising Architect written notice thereof before proceeding to execute the work and, in any event, said notice shall be given within two weeks after receiving such instructions, and the procedure then shall be as provided under the article on "Changes in Work." applications for Payments

Certificates of payment, if requested by the Contractor, will be issued monthly during the period allowed by the Contract for the completion of the work or as extended in accordance with provisions under the article on "Delays." The Contractor shall submit his applications for payment monthly to the Supervising Architect and, if requested, he shall submit receipts or other vouchers showing his payments for materials and labor, including payments to sub-contractors. This application shall be submitted on the form furnished him by the Supervising Architect and no other form shall be recognized. He shall fill it out com-

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