What must the contractor keep at the site?

• A. Only the original contract and insurance certificates
• B. Copies of all emails to the architect
• C. One copy of drawings, specifications, change orders, addenda and other modifications marked to indicate field changes, as well approved shop drawings, product data, samples and similar required submittals
• D. The owner's personal records

Answer: (C)

The main idea is that the contractor must keep an up-to-date, on-site record set of all contract documents and approved submittals. Having one copy at the site that is clearly marked to show field changes, along with approved shop drawings, product data, samples, and similar required submittals, ensures everyone works from the latest information and there is a clear, auditable record of what was approved and what was built. This helps with coordination, prevents mismatches between design intent and construction, and provides a ready reference for questions or changes that arise in the field. Other options miss essential components of this requirement, such as the lack of field-marked changes and missing submittal materials, so they don’t satisfy the contractor’s duty.