The ECSC does not operate based on a standard method of measurement like Option B of the ECC, the reason being that the ECSC isn't designed to be used for larger, riskier, more complex projects that require extensive management procedures. Re-measurement in the ECSC should therefore be a much simpler exercise than it would be in an ECC.
Your circumstances sound like a compensation event under clause 60.1(9) physical conditions which were not allowed for or described in the Site Information (clause 60.2). This would entitle you to recover the additional Defined Cost + OH&P% and an extension of time for the additional work.
Your circumstances sound like a compensation event under clause 60.1(9) physical conditions which were not allowed for or described in the Site Information (clause 60.2). This would entitle you to recover the additional Defined Cost + OH&P% and an extension of time for the additional work.