S4 Surround to Apparatus
S4.1.1 Surround to the apparatus may be laid to a maximum thickness of 250 mm above the crown of the Undertaker's apparatus. The surround to apparatus shall not intrude into the road structure. It may be necessary on occasions for the Undertaker to lay apparatus deeper, should there be a need to include surround to their apparatus.
S4.1.2 Laying and compaction procedures used for all materials laid as surround to the apparatus shall be the responsibility of the Undertakers.
S4.1.3 The selection of materials for the surround to apparatus shall be the responsibility of the relevant Undertaker. However, all materials used for the surround to apparatus shall comply with the following requirements:
1) Class E Unacceptable Materials, as defined in Appendix A1, and materials that contain particles greater than 37.5 mm nominal size shall not be used as surround to the apparatus.
2) An Alternative Reinstatement Material (ARM) may be used for the entire surround to apparatus or any part thereof, in accordance with Appendix A9.
3) Preformed modules or other protective measures may be placed within the surround to apparatus, according to the Undertaker's requirements.