Itemization
In short
A gating precondition. The mixed-contract analysis is available only where the charge for each activity type is separately identified.
In full
The mixed-contract analysis may be used only where the amount charged for each activity type is separately identified and the activity accurately described.
Back-end records behind a lump-sum bid are accepted in place of itemization on the contract itself. What cannot be supplied later is accuracy: labeling a charge as replacement does not make it replacement, and the Department reserves the right to reallocate itemized charges that are not consistent with the contractual description.
One assignment rule is fixed rather than left to the itemizer. Demolition, wreckage and site preparation costs are considered part of the main project, so they follow whatever the surrounding work is rather than standing on their own. ADOR's own examples: alteration demolition goes into the alteration bucket, replacement demolition into the replacement bucket. Where the project is MRRA, demolition that is a necessary part of it is MRRA too.
That rule runs the same direction as the statute. A.R.S. § 42-5075(S)(6)(b) excludes from Modification any wreckage or demolition that is a necessary component of an MRRA project.
This is a precondition rather than a step. Where itemization is not met in any form, the worksheet does not apply and the question of proportions never arises — the lump-sum default takes over instead.
ADOR Evaluating Mixed Construction Contracts worksheet, section 1; A.R.S. § 42-5075(S)(6)(b)