`Code
1 -
Accepted
C222-ATK-DS-REP-020-000034 |P06 | 27 Feb 2015
Proposal for Northern Extension of Northolt
Tunnel
SIFT Report
Revision
Date
Issued for/Revision details
Revised by
P01
13.06.2014
Issued for review
HSF
P02
30.01.2015
Review and update to include
HS2 comments
SS
P03
24.02.2015
Updated to include comments
and Rail Systems info
AR
P04
26.02.2015
Updated following review
AR
P05
27.02.2015
Updated for final review
AR
P06
02.03.2015
Final
AR
Name
Data
FOI / EIR
None
Document type
Report
Directorate
London West Midlands
WBS
B320 & PE.06.57
Keywords
Colne Valley Viaduct, Northolt Tunnel, River Colne
Authors
H S Farrant
Checker
Roger Weber
Approver
Andy Robson
Owner
C222
Atkins
Review Directorate
LWM TD
Employer’s Lead Reviewer
Neil Cowie
Authorised for use
`Code
1 -
Accepted
Uncontrolled when printed
INTERNAL INFORMATION
Northern Extension of Northolt Tunnel SIFT Report
Northern Extension of Northolt Tunnel SIFT
Report C222-ATK-DS-REP-020-000034
Revision – P06
2
Uncontrolled when printed
INTERNAL INFORMATION
London West Midlands
Northolt Tunnel Extension - SIFT Report
Contents
Page number
1.
Executive Summary ................................................................................................... 5
2.
Introduction ............................................................................................................... 6
3.
Scope of the Sift ......................................................................................................... 8
4.
Assumptions .............................................................................................................. 9
4.1
General .................................................................................................................. 9
4.2
Applicable Safety Standards ............................................................................... 10
5.
Constraints and Issues ............................................................................................. 12
5.1
Study Area ........................................................................................................... 12
5.2
Site Constraints ................................................................................................... 12
5.3
Environmental Constraints ................................................................................. 13
5.4
Land and Property Constraints ........................................................................... 13
5.5
Engineering Construction .................................................................................... 13
5.6
Rail Systems Construction ................................................................................... 14
6.
Option Description ................................................................................................... 15
6.1
General ................................................................................................................ 15
6.2
Intervention Gap Development .......................................................................... 15
6.3
Provision for Heathrow Spurs - General ............................................................. 17
6.4
Development of Railhead Location - General ..................................................... 19
6.5
Development of Intervention Shaft Locations - General .................................... 21
6.6
Impact on Rail Systems ....................................................................................... 25
6.7
Northolt Tunnel Construction and Logistics - General ....................................... 30
6.8
Impact on Northolt Tunnel Construction - General ............................................ 32
6.9
Option A (Proposed Scheme) – Hybrid Bill ......................................................... 33
6.10
Option B – Tunnelled Option with Passive Heathrow Spur Provision ................ 34
6.11
Option C – Tunnelled Option without Passive Heathrow Spur Provision ........... 35
7.
Comparison of Options ............................................................................................ 36
7.1
Construction Costs .............................................................................................. 36
7.2
Programme Impacts ............................................................................................ 37