Final answer:
The contractor must take appropriate actions if unexpected conditions are found on the site, and the duration to address the situation will vary.
Step-by-step explanation:
If the contractor uncovers conditions on the site that could not have reasonably been accounted for, they must take appropriate actions to address the situation. This may involve revising the project plan, seeking expert advice, or obtaining permits or approvals. The length of time required to carry out these actions will vary depending on the nature of the conditions and the necessary steps to rectify them.