management plan(s)), 18 (Operational lighting strategy) and 19 (Control of operational noise) of  the Order to the relevant planning authority, the undertaker shall submit the same at the same time  to Thames Water care of Linda Rushton at Clearwater Court, Vastern Road, Reading RG1 8DB  and Michael Swain at Bazalgette Way, Abbey Wood, London SE2 9AQ.  104.  For the protection of SGN the following provisions will, unless otherwise agreed in writing  between the undertaker and SGN, have effect.  105.  In this Part of this Schedule—  “alternative apparatus” means appropriate alternative apparatus to the satisfaction of SGN to  enable SGN to fulfil its statutory functions in a manner no less efficient than previously;  “apparatus” means any gas mains, pipes, pressure governors, ventilators, cathodic protections,  cables or other apparatus belonging to or maintained by SGN for the purposes of gas  distribution together with any replacement apparatus and such other apparatus constructed  pursuant to the Order that becomes operational apparatus of SGN for the purposes of  transmission, distribution and/or supply and includes any structure in which apparatus is or  will be lodged or which gives or will give access to apparatus;  “authorised works” has the same meaning as is given to the term “authorised development” in  article 2 of this Order and includes any associated development authorised by the Order and  for the purposes of this Part of this Schedule includes the use and maintenance of the  authorised works and construction of any works authorised by this Schedule;  “commence” has the same meaning as in article 2 and commencement is to be construed to  have the same meaning save that for the purposes of this Part of the Schedule the terms  commence and commencement include the pre-commencement works;  “deed of consent” means a deed of consent, crossing agreement, deed of variation or new deed  of grant agreed between the parties acting reasonably in order to vary and/or replace existing  easements, agreements, enactments and other such interests so as to secure land rights and  interests as are necessary to carry out, maintain, operate and use the apparatus in a manner  consistent with the terms of this Part of this Schedule;  “functions” includes powers and duties;  “ground mitigation scheme” means a scheme approved by SGN (such approval not to be  unreasonably withheld or delayed) setting out the necessary measures (if any) for a ground  subsidence event;  “ground monitoring scheme” means a scheme for monitoring ground subsidence which sets  out the apparatus which is to be subject to such monitoring, the extent of land to be monitored,  the manner in which ground levels are to be monitored, the timescales of any monitoring  activities and the extent of ground subsidence which, if exceeded, requires the undertaker to  submit for SGN’s approval a ground mitigation scheme;  “ground subsidence event” means any ground subsidence identified by the monitoring  activities set out in the ground monitoring scheme that has exceeded the level described in the  ground monitoring scheme as requiring a ground mitigation scheme;  “in” in a context referring to apparatus or alternative apparatus in land includes a reference to  apparatus or alternative apparatus under, over, across, along or upon such land;  107 PART 9  FOR THE PROTECTION OF SOUTHERN GAS NETWORKS PLC AS GAS  UNDERTAKER  Application  Interpretation 