[With regard to any county which is exempt from the provisions of Section 19-2-3, this section shall read as follows:]
The board of supervisors may purchase or lease land upon which to establish stations for the working of the public roads, and may erect on the land barns, sheds, and other necessary buildings for the working of the public roads; but the board shall not purchase over ten (10) acres of land for any one (1) station. If the board is unable to purchase or lease, upon terms satisfactory to it, a site selected by it for a station, or in case it is unable to agree with any landowner as to the amount of compensation he shall receive for any land so selected, then the board may proceed to obtain not more than two (2) acres of said site by eminent domain, and the right of eminent domain for no more than two (2) acres is hereby conferred upon the boards of supervisors for said purposes.