ARO defensibility checklist | Endura Decommissioning

Asset retirement obligation (ARO) Defensibility Checklist

The evidence behind the cost basis.

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A · Documentation lineage

01Traceable basis of estimateCan the current cost number be followed to documented quantities, assumptions and rates rather than an inherited spreadsheet?02Authorship continuityCan someone on the current team explain and defend how the estimate was built?03Transfer integrityWas documentation reconciled through each ownership transition rather than transferred as-is?

B · Engineering evidence

04Verified structural as-builtsAre primary-steel records and modification history confirmed against current condition?05Current hazardous-material and naturally occurring radioactive material (NORM) inventoryIs the inventory classified, traceable and suitable for disposal planning?06Isolation philosophyDo line-status and containment records support a credible make-safe scope?07Recent inspection dataIs integrity evidence current enough to support access, lifting, removal and temporary-state assumptions?

C · Regulatory and waste

08Regulator-ready evidenceCould the evidentiary trail for the proposed end state, derogation or close-out be assembled now?09Costed waste pathwayIs the waste strategy tested against real disposal and recycling routes, capacity and chain-of-custody requirements?10End-state justificationIs the selected end state supported by current evidence of net benefit and applicable regulatory expectations?

D · Commercial defensibility

11Defined estimate basis and classificationAre the purpose, scope definition and estimating method stated, with the applicable classification practice identified and any uncertainty range justified separately? A class label alone does not establish accuracy.12Independent challengeHas a technically independent reviewer stress-tested the basis, assumptions, interfaces and material omissions?

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