You have to be very care full when listing such a time related activity as an activity schedule item. Either such costs should be spread across other activities so that recovery will be progressive as other activities are completed, or you could break that item down into monthly milestones such as "Feb site establishment costs", "March site establishments costs" etc. There are no real hard rules here - just by agreement you can agree how these are best dealt with.
Even then, if an item is not completed or ever going to be completed then the Contractor can issue for acceptance a revised activity schedule reallocating that cost accordingly. Providing the revised activity schedule is in line with the current programme, adds up to the correct number and is suitable distributed (i.e. not front loaded) then there should be no reason not to accept the revised activity schedule. If say you had a line item to provide scaffolding and then you do not provide that scaffolding (but it makes the installation more difficult) then you should be able to redistribute that cost to another activity be revising the activity schedule (clause 54.2/3).
Even then, if an item is not completed or ever going to be completed then the Contractor can issue for acceptance a revised activity schedule reallocating that cost accordingly. Providing the revised activity schedule is in line with the current programme, adds up to the correct number and is suitable distributed (i.e. not front loaded) then there should be no reason not to accept the revised activity schedule. If say you had a line item to provide scaffolding and then you do not provide that scaffolding (but it makes the installation more difficult) then you should be able to redistribute that cost to another activity be revising the activity schedule (clause 54.2/3).