The authority under section 88 (6) must—
(a) be in writing and be signed by the chief executive of the local government; and
(b) state the following—(i) that the authority is issued under this Act;(ii) the name of the person to whom it is issued;(iii) the land to which the authority applies;(iv) that the person has authority to enter the land;(v) the purpose for which the land is being entered;(vi) whether the person has authority to carry out any work required under an order;(vii) the date, not more than 90 days from the date of the authority, on which it expires.