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i scheduled for completion at any time . If requested by the Engineer , the Contractor shall submit supplemental progress schedules from time to time during the progress of the work. The schedule shall be in the form of a typical bar type chart. The project bar chart schedule shall be broken down into major classes of work for each major structure and into major equipment items , or shall be broken down into items of the proposal where the proposal is itemized. The Contractor shall, to every reasonable extent, carry on the work of construction of the various elements of the project concurrently , and shall not defer construction of any portion of the work in favor of any other portion without the express approval of the Engineer. G7 .04 Responsibility for Accuracy. The Contractor shall obtain all necessary measurements for and from the work, and shall check dimensions , elevations , and grades for all layout and construction work and shall supervise such work , for the accuracy of all of which he shall be responsible . Each subcontractor shall adjust, correct, and coordinate his work with the work of others so that no discrepancies will result in the whole work. Unless authorized by the Engineer , any work done without lines , levels, or grades established by the Engineer shall be done at the Contractor ' s risk. G7 .05 As-Built Drawings. The Contractor shall maintain a neatly 1 marked set of record drawings showing the final locations and layout of all mechanical, electrical and instrumentation equipment ; piping and conduit ; structures , and other facilities. Drawings shall be kept current with all field instructions ; mechanical , electrical and instrumentation equipment accommodations; and construction adjustment. Drawings shall be subject to the inspection of the Engineer at all times. Prior to acceptance of the work, the Contractor shall deliver to the Engineer two sets of neatly marked record drawings showing the information required above . One set shall be reproducible . Progress payments to the Contractor may be withheld if, in the opinion of the Engineer , record drawings are not kept current and in a satisfactory manner . G7. 06 Equipment and Methods. Only equipment and methods suitable ' to produce the quality of work required will be permitted to operate on the project. Equipment shall, except as specified in Par . G5 . 12, conform to that in general practice for work of the type undertaken . If any part of the Contractor ' s plant , equipment, or methods of execution of the work appear to the G-33