(4) Any alternative apparatus to be constructed in land of or land secured by the undertaker  under this Part of this Schedule must be constructed in such manner and in such line or situation as  may be agreed between Cadent and the undertaker.  (5) Cadent must, after the alternative apparatus to be provided or constructed has been agreed,  and subject to the prior grant to Cadent of such facilities and rights as are referred to in sub- paragraphs (2) or (3), then proceed without unnecessary delay to construct and bring into  operation the alternative apparatus and subsequently to decommission or remove any apparatus  required by the undertaker to be decommissioned or removed under the provisions of this Part of  this Schedule.  25. —(1) Where, in accordance with the provisions of this Part of this Schedule, the undertaker  affords to or secures for Cadent facilities and rights in land for the access to, construction and  maintenance of alternative apparatus in substitution for apparatus to be decommissioned or  removed, those facilities and rights must be granted upon such terms and conditions as may be  agreed between the undertaker and Cadent and must be no less favourable on the whole to Cadent  than the facilities and rights enjoyed by it in respect of the apparatus to be decommissioned or  removed unless otherwise agreed by Cadent.  (2) If the facilities and rights to be afforded by the undertaker and agreed with Cadent under  sub-paragraph (1) in respect of any alternative apparatus, and the terms and conditions subject to  which those facilities and rights are to be granted, are less favourable on the whole to Cadent than  the facilities and rights enjoyed by it in respect of the apparatus to be decommissioned or removed  (in Cadent’s opinion) then the terms and conditions to which those facilities and rights are subject  in the matter will be referred to arbitration in accordance with paragraph 32 (arbitration) of this  Part of this Schedule and the arbitrator is to make such provision for the payment of compensation  by the undertaker to Cadent as appears to the arbitrator to be reasonable having regard to all the  circumstances of the particular case.  26. —(1) Not less than 56 days before the commencement of any specified works the undertaker  must submit to Cadent a plan and, if reasonably required by Cadent, a ground monitoring scheme  in respect of those works.  (2) The plan to be submitted to Cadent under sub-paragraph (1) must include a method  statement and describe—  (3) The undertaker must not commence any works to which sub-paragraphs (1) and (2) apply  until Cadent has given written approval of the plan so submitted.  (4) Any approval of Cadent required under sub-paragraph (3)—  (5) In relation to any work to which sub-paragraphs (1) and/or (2) apply, Cadent may require  such modifications to be made to the plans as may be reasonably necessary for the purpose of  81 (a) may be given subject to reasonable conditions for any purpose mentioned in sub- paragraphs (5) or (7); and  (b) must not be unreasonably withheld.  (f) any intended maintenance regimes.  (e) by way of detailed drawings, every alteration proposed to be made to or close to any such  apparatus; and  (d) the position of all apparatus;  (c) the manner of their construction or renewal including details of excavation, positioning of  plant, etc.;  (b) the level at which these are proposed to be constructed or renewed;  (a) the exact position of the works;  Facilities and rights for alternative apparatus  Retained apparatus: protection of Cadent 