13.—(1) The undertaker may, for the purposes of the authorised project, enter on so much of any of the streets specified in columns (1) and (2) of Schedule 4 (streets subject to street works) as is within the Order limits for the relevant site specified in column (3) of Schedule 4 and may—
(a)break up or open the street, or any sewer, drain or tunnel under it;
(b)tunnel or bore under the street;
(c)place apparatus in the street;
(d)maintain apparatus in the street or change its position; and
(e)execute any works required for or incidental to any works referred to in sub-paragraphs (a), (b), (c) and (d).
(2) In this article “apparatus” has the meaning given in section 105(1) of the 1991 Act.