In a contract, your company should make sure the document indicates that you will rely on information and materials supplied by the client. E.g. surveys, soil tests, reports.
If the client will not agree to this, you should make sure the contract allows money for adequate review by your company of the client supplied documents.
This is particularly important for old drawings, locations of underground cables or pipes, status of old tanks or equipment.
The client may not be able to guarantee the status of the old plant, so your company should be paid for work involved in reviewing or re-surveying.