7 Environmental Baseline and Assessment of Impacts – North East Route Section
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Crossrail Line 1 Mott MacDonald Assessment of Water Impacts Technical Report Cross London Rail Links Limited 7 Environmental Baseline and Assessment of Impacts – North East Route Section 7.1 Overview of Route Section The North East Route Section covers the route from Stratford Station to Shenfield in the east. The figure below shows the route alignment. Figure 7.1: North East Route Section Alignment The main works are summarized below. Sections 7.2 to 7.4 outline sources of data, baseline conditions and impacts at a route section level. Sections 7.5 onwards discuss baseline conditions and impacts relevant to each individual route window. (i) Permanent Works Crossrail services within the North East Route Section would run on the existing electric suburban tracks of the GEML. Little new rail alignment would be created, although new track would be required to provide a freight loop between Goodmayes and Chadwell Heath in order to replace an existing loop at Manor Park, which would be removed. Also, the reconstruction of Shenfield station would be undertaken as well as new junction works at Ilford. Crossrail would require new or extended platforms at several stations in order to accommodate its 200 m long trains. At Romford and Ilford, new station buildings and other facilities would be provided as well. Crossrail’s other major facility on this line is a new depot and stabling sidings to the west of Romford station and south of the GEML. This is linked to the eastbound and westbound Crossrail running lines by an dive-under (rail underpass) enabling Crossrail trains to access 7-1 203357/31/Final/Feb 05 Chapter 7 - North East Section rev103.doc Crossrail Line 1 Mott MacDonald Assessment of Water Impacts Technical Report Cross London Rail Links Limited the depot without hindering services on the main lines. Stabling sidings would also be provided on re-modelled existing sites at Gidea Park and Shenfield. New sidings would be constructed at Aldersbrook (near Ilford) to facilitate fit-out of the Crossrail tunnels, and at Pitsea for disposal of excavated material. (ii) Construction Works Major works to tracks would be carried out for the proposed tunnel logistics site at Aldersbrook between Manor Park and Ilford; the restoration of a redundant freight loop between Goodmayes and Chadwell Heath; and for the construction of a diveunder to the new depot at Romford. Platform extensions, which would be undertaken at several stations, would involve: • break out and removal of existing surfaces and ramps; • excavation of foundations to about 1 m depth; • construction of platforms either using crosswalls and pre-cast concrete planks, using a proprietary system or traditional construction; • fitting of reinforced concrete screed, pre-cast concrete copings, tactile strips and the levelling of the surface; • adjustment of track alignments, if required; and • modifications to OHLE and signalling as necessary. The scale of the works along the route varies. Relatively minor works, such as station platform extensions, would take place in some route windows with more substantial works, such as the development of Romford depot, taking place in others. The table below summarises the main works (including major enabling works) that would take place in the north east section. Those route windows containing the more substantial works are highlighted with shading. Table 7.1: Main Elements of the Project in the North East Route Section (route windows with major works are highlighted) Route Window Main Project Works NE1 Stratford Station (Biggers Road Platform alterations to Carnarvon Road) NE2 Forest Gate Station (Carnarvon Platform extensions Road to Balmoral Road) NE3 Manor Park Station (Balmoral Platform extensions Road to Gloucester Road) Shortening of freight loop 7-2 203357/31/Final/Feb 05 Chapter 7 - North East Section rev103.doc Crossrail Line 1 Mott MacDonald Assessment of Water Impacts Technical Report Cross London Rail Links Limited Route Window Main Project Works NE4 Ilford Station (Gloucester Road Extension of platforms and removal of the to Hainault Street) bay platform Construction of a new ticket hall New sidings for construction/fitout of the central area tunnels (Aldersbrook sidings) NE5 Seven Kings Station (Hainault Platform extensions Street to St Albans Road) NE6 Goodmayes Station (St Albans Platform extensions Road to Wadeville Avenue) Introduction of new freight loop (Chadwell Heath Loop) NE7 Chadwell Heath Station Platform extensions (Wadeville Avenue to Whalebone Track works Lane South) Introduction of new freight loop (Chadwell Heath Loop) NE8 Romford Depot (west) Romford Depot Underpass and associated (Whalebone Lane South to track works Sheringham Avenue) Widening of Jutsums Lane bridge NE9 Romford Station & Depot (east) Extension of platforms (Sheringham Avenue to Carlisle Reconstruction of the ticket hall and Road) extension of the ticket hall Construction of a new depot New stabling sidings NE10 Gidea Park Station (Carlisle Platform extensions Road to Upper Brentwood Road) NE11 Gidea Park Stabling Sidings New stabling sidings (Upper Brentwood Road to Briars Walk) NE12 Harold Wood Station (Briars Platform extensions Walk (western end) to Harold Court Road) NE13 LB Havering / Brentwood DC None Boundary (Harold Court Road to M25) NE14 Brook Street (M25 to None Kavanaghs Road) NE15 Brentwood Station (Kavanaghs Platform extensions Road to Seven Arches Road) 7-3 203357/31/Final/Feb 05 Chapter 7 - North East Section rev103.doc Crossrail Line 1 Mott MacDonald Assessment of Water Impacts Technical Report Cross London Rail Links Limited Route Window Main Project Works NE16 Thrift Wood (Seven Arches None Road to Woodway) NE17 Shenfield Station (Woodway to New stabling sidings. Brentwood Long Ridings school) A new platform face R1 Pitsea New rail sidings 7.2 Sources of Information Data on the baseline conditions has been obtained from various sources, including the Environment Agency, Thames Water Utilities Ltd, English Nature and various London Boroughs and District Councils. The table below contains information about the data obtained and used in the assessment. Table 7.2: Sources of Data – North East Route Section Subject Data Source Date received Groundwater Groundwater quality records Environment Agency November 2002 Groundwater Groundwater abstraction licenses Environment Agency November 2002 Thames Region Groundwater Section 32 consents Environment Agency October 2003 Thames Region Groundwater Abstractions in determination Thames Water October 2003 Groundwater Abstractions determined in March Thames Water August 2004 2004 Groundwater Protected Groundwater Rights Personal contact with November 2002 London Boroughs and District Councils Groundwater Source Protection Zones Environment Agency November 2002 Thames Region Groundwater Source Protection Zones Environment Agency December 2002 Southern Region Groundwater Groundwater quality records Environment Agency November 2002 Thames Groundwater Chalk Water Levels January 2003 Environment Agency July 2003 Surface Water Indicative flood plains Environment Agency November 2002 Surface Water Surface Water Discharges Environment Agency May 2003 Thames Region Surface Water Surface Water Abstraction Licenses Environment Agency December 2002 Thames Region Surface Water Main rivers Environment Agency February 2003 Thames Region Surface Water Other watercourses 1:5,000 (Crossrail) and n/a 1:25,000 (OS) maps 7-4 203357/31/Final/Feb 05 Chapter 7 - North East Section rev103.doc Crossrail Line 1 Mott MacDonald Assessment of Water Impacts Technical Report Cross London Rail Links Limited Subject Data Source Date received Surface Water GQA and RQO Environment Agency May 2003 Thames Region Surface Water GQA and RQO Environment Agency June 2003 Website Surface Water Flood Zone Maps (Zone 3), June Environment Agency December 2004 2004 Surface Water Flood Levels Environment Agency October 2003 Thames Other SSSI, SPA, SAC, NNR, Ramsar English Nature November 2002 7.3 Baseline Information – North East Route Section 7.3.1 Introduction The route window descriptions of baseline conditions include a summary of the baseline data, relevant for the window. Baseline data are assessed according to the scope and methodology described in Chapters 2 to 4, even though the environmental receptor in question may be outside the route window. This is noted wherever it applies. Maps have been produced showing the following baseline data: groundwater abstractions, 2003 Chalk water levels, area affected by saline intrusion, groundwater protection zones, surface water abstractions and discharges, main rivers and floodplains. 7.3.2 Geology and Hydrogeology (i) Stratigraphy The geological formations within the North East Route Section are described in the following sections. The geological description is based on geological maps and information from geological records along the alignment. A summary of the general stratigraphy is presented in the table below. An indication of the geology in relation to the vertical alignment of Crossrail Line 1 is shown in Appendix C and is discussed in (vii) below. Table 7.3: Stratigraphy Period Group Formation Description Hydrogeological Properties Recent Made Ground Permeable shallow Alluvium aquifer in direct Quaternary Drift Langley, Ilford, Brickearths. continuity with Crayford and River Thames and Dartford Silts other surface 7-5 203357/31/Final/Feb 05 Chapter 7 - North East Section rev103.doc Crossrail Line 1 Mott MacDonald Assessment of Water Impacts Technical Report Cross London Rail