2. The undertaker must not in the exercise of the powers conferred by this Order unreasonably prevent the Agency’s access to and use of the dosing station adjacent to Salmon’s Brook in the vicinity of the southern entrance to the Edmonton EcoPark except where construction and operation of the authorised development reasonably requires interference with or obstruction of the free, uninterrupted and safe use of the 1973 Transfer Rights in which case a suitable alternative access must be agreed with the Agency and provided prior to and for the duration of any such interference.