The Contractor should revise their activity schedule to distribute these costs to other activities that they are doing. Under option A this is a lump sum fixed price contract so unless works have been omitted as a compensation event they should be redistributed.
Should there be the need for twice the number of pumps than they priced for (but were in WI) then they can not claim extra for those either.
Should there be the need for twice the number of pumps than they priced for (but were in WI) then they can not claim extra for those either.