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ii. Provided also that no increase of the Contract Price or variation of rate or price, shall be made, unless as soon after the date of the order as is practicable, and in the case of extra or additional work, before the commencement of the work, or as soon thereafter as is practicable, notice shall have been given in writing:

1. by the Contractor to the Engineer of his intention to claim extra payment, or a varied rate or,

2. by the Engineer to the Contractor of his intention to vary a rate or price,

as the case may be,

iii. The Engineer may, if in his opinion it is necessary or desirable, order in writing that any additional substituted work shall be paid for by one or more of the following ways:

1. By estimate and acceptance in a lump sum

2. By unit prices agreed upon

3. By cost and percentage or by cost and a fixed fee

iv. Where extra or additional work is to be paid for by method ©, the value shall be determined by the actual cost of:

1. Labour, including Workers’ Compensation and insurance. The labour rates shall not exceed those paid by the Contractor on the contracted part of the work.

2. Materials, which shall not exceed the costs paid by the Corporation for similar materials.

To which labour and/or materials cost, shall be added fifteen per centum (15%) to cover general expenses, superintendence, use of tools and profit.

v. In the event that the Engineer directs that additional work is to be done, in a location other than that which is shown in the contract drawings, the Contractor shall be requested to submit a quotation for this work. Payment shall then be made in the form of a Change Order.