 He also brought a detachment of Royal Engineers, with instructions that he was also to take charge of and superintend the buildings belonging to the military, and convict departments.Bourke stated in February 1836 that Barney was engaged in removing obstructions to the navigation of the Parramatta River, and asked that leave might be granted him to undertake the duty of colonial engineer at a salary of £500 a year plus travelling charges.This was granted in September 1837, and in 1838 Barney brought forward a scheme for the sale of the barracks in Sydney, as the land was now valuable; the proceeds to be used for new buildings at Sydney and Newcastle, New South Wales.