Guidance drafting as follows:

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23 This model contract assumes that the Contractor is able to make any necessary investigation. To the extent that it is not practical for the Contractor to investigate areas of the Site, then Clause 11.3 will provide relief. The Authority should bear any additional costs arising out of unforeseen conditions in areas which the Contractor cannot investigate and which cannot be reasonably identified by the Contractor. Areas of the Site to which this carve out applies should be clearly identified in the Contract. See further guidance in SoPC4, Chapter 6 (Warranties).