NEC3 ECC: Could some one please explain to me what the "on cost charge" as referenced in item 23 in the Schedule of Cost Components

Also as referenced in the Contract Data part 2.

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The on cost charge refers to the data inserted by the Contractor in Contract Data part two page 76 in the ECC black book Data for Schedule of Cost Components
Equipment time related charge per time period
Excavator £500 per week

The Contractor may have Equipment which is non standard and market rates are difficult to establish.