required by the Engineer. All samples shall be supplied by the Contractor at his own cost. 

• ii. The Contractor shall supply at his own expense, certified copies of all tests upon all materials entering into the Contract. Such tests shall be made, as and when directed by the Engineer, and by an approved testing laboratory. 

GC 3.13 PAYMENT FOR TESTING 

1. The following tests, called for as required by the Engineer, will be paid for by the Corporation:
   
   
   1. Air entrainment tests during concrete work.
   2. Slump tests during concrete work.
   3. Casting and compression testing of concrete cylinders.
   4. Compaction tests. Limit of one test per location. If the result of any compaction test is below that specified, the Engineer may call for retesting, and all costs associated with such retesting shall be paid by the Contractor.
   5. Analysis of granular materials and approval of sources. Limit of one analysis per type of materials.
   6. Asphalt extraction tests.
      
      
2. The above tests are for compliance purposes only. The test results shall not be the basis for any mix designs and shall not bind the Corporation to accept any material for use in the Contract.
   
   
3. The Contractor and suppliers are responsible for maintaining an adequate quality control program and for conducting tests on all materials incorporated into the Contract at their own expense. The results of the quality control program and material tests shall be made available to the Engineer promptly, upon request. 

GC 3.14 URGENT REPAIRS 

If by reason of any accident or failure or other event occurring to, in, or in connection with, the Works or any part thereof, either during the execution of the Works or during the Period of Maintenance, any remedial or other work or repair shall in the opinion of the Engineer be urgently necessary for security, and the Contractor is unable or unwilling at once to do such work or repair, the Corporation may have its own or other workers to do such work as the Engineer may consider necessary. If the work or repair, so done by the Corporation is work, which in the opinion of the Engineer, the Contractor was liable to do at his own expense under the Contract all costs and charges properly incurred by the Corporation in so doing, shall