CROSSRAIL – WEST DRAYTON STATION Contractor: ±á´Ç³¦³ó³Ù¾±±ð´ÚÌý ³Õ²¹±ô³Ü±ð:Ìý£1.7³¾ Groundworks • Pile excavation and breakdown for northern staircase and footbridge. • Excavation, temporary works, and reinforced concrete works for lift pit,        retaining walls, pile caps and slabs. • Installation of subsurface drainage and ducting • Construction of concrete stairs between northern extension and link • All brickwork and blockwork cavity wall to the southern façade of the          northern extension building. • All blockwork cavity wall to stone rainscreen clad walkway to northern lift • All internal blockwork walls including in plant rooms and existing ticket hall. • All movement joints, DPC, waterproofing, insulation, and sealants to           complete the above walling systems. • Installation of attenuation tank • Platform subsurface drainage installation and connection to existing          (Nightshift Works)