Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489

Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001

Revision Author Reviewed by Approved by Date approved Reason for revision

C01 M McAree / John O’Connor Jon Neale 25/04/2019 Issue S.White

HS2-HS2-CO-TEM-000-000046 P01 Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

Security classification: OFFICIAL

Handling Instructions: none

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

Contents

1 Non-Technical Summary 1

2 Technical Summary 2 2.2 Plant Overview 3 2.3 Slurry receipt 4 2.4 Slurry Treatment Plant process 5 2.5 STP design 5 2.6 Slurry makeup tanks 7 2.7 De-sanded slurry dehydration 7 2.8 Dirty water cleaning 9 2.9 Use of polymers 9

3 Application Forms 11 3.1 Form A 11 3.2 Form B2 11 3.3 Form B4 11 3.4 Form F1 11

4 Additional Information 12 4.1 Application Overview 12 4.2 EPR Application Form A 12 4.3 EPR Application Form B2 13 4.4 EPR Application Form B4 37

Appendix A – Letters of Authorisation 40

Appendix B – Figures 41

B.1 Figure 1 – Site Location Plan 41

B.2 Figure 2 – Permit Boundary 42

Appendix C - Site Layout 43

C.1 Bunding details 44

C.2 Figure 4 – Block flow diagram 1 45

C.3 Figure 5 – Block flow diagram 2 46

Appendix D – BAT Conclusions Applicability 47

Appendix E – CL:AIRE DoW CoP 53

E.1 Use of CL:AIRE at the Southern Portal 53 Figure E.1 – Materials management approach in Section C1 55

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

Appendix F – Site Condition Report 56

F.1 Site Condition Report 56

Appendix G – CoTC Evidence 62

Appendix H – Proposed Polymer MSDS 63

List of figures Figure 1 : ALIGN EMS Document Hierarchy 14

List of tables Table 1: Summary of designated sites 17 Table 2: Summary of receptor sites 18 Table 3: Overall assessment of risk 19 Table 4: Assessment scores interpretation 19 Table 5: Overall assessment scores 20 Table 6: Waste operations which do not form part of an installation 37 Table 7: Types of waste accepted at the site 37 Table 8: Emissions 38

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

1 Non-Technical Summary 1.1.1 This permit application is made on behalf of the three organisations who make up the Align Joint Venture (Align JV) and relates to a non-hazardous waste treatment activity associated with the construction of Package C1 of the High Speed 2 (HS2) rail link. Package C1 encompasses 22 km of the route of HS2 through Buckinghamshire. The application is for a bespoke waste Environmental Permit for the physico-chemical treatment of non-hazardous waste for the purposes of recovery. The permitted area relates to land located at the southern portal (entrance) of the Chiltern Tunnel of HS2.

1.1.2 The only waste to be treated is chalk slurry (slurry) originating from the boring of the Chiltern Tunnel. The tunnel consists of 2 separate bored tunnels, one for each direction of travel. The tunnel is approximately 16km long and bored through chalk, with a number of different chalk strata being present along the length of the bore. The slurry treatment plant (STP) is located at the southern portal of the Chiltern Tunnel, where all arisings from boring operations are handled. Upon completion of the tunnelling works, the plant will be decommissioned, and the permit surrendered. It is currently envisioned that the plant operational lifespan will be approximately 4 years.

1.1.3 The Chiltern Tunnel is to be bored using two variable density tunnel boring machines (TBM), one per bore. This type of TBM has been specifically chosen for the geology to be encountered, taking into account the chalk strata, the location of the bore below the typical water table for large distances and the utilisation of the water table for public water supply, which means the bore crosses a number of source protection zones. A variable density TBM relies on the hydrostatic pressure behind the cutter face, produced by a slurry, to seal the bore during progress. The slurry in this case will be a mixture of water and chalk, which mixes with the cutter debris. This mixed slurry is pumped back to the southern portal via a hydraulic circuit where it is regenerated for reuse and the solid material removed.

1.1.4 The treatment process consists of a STP which treats the slurry to remove coarse and then fine particulate matter, following dosing with a suitable cfilter aid, resulting in a filter cake material. This is tested to confirm its suitability for recovery in the designated landscaping scheme under the CL:AIRE Definition of Waste: Code of Practice (DoW: CoP). The treated material will be reused to form the profile of landscaped areas sitting beneath topsoil and subsoil layers in accordance with the agreed project landscaping scheme.

1.1.5 Some produced filter cake material may be subject to chemical dosing with lime or cement in order to meet the moisture content requirements for the landscaping scheme. This dosing is likely to primarily be weather dependent. Other filter cake will be subject to treatment with cement powder, in order to provide the necessary cohesive strength to

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

construct haul and access roads for placement cells within the landscaping area. The majority of recovered material will not be chemically treated.

1.1.6 Liquid recovered from the filtration process, when lime is used as a filter aid, is primarily water with an elevated pH. It is recovered by reducing the pH through the additional of sulphuric acid. When polymer is used as a filter aid the filtrate is close to neutral pH. In both cases, the filtrate is used to produce regenerated slurry which is returned to the TBMs for reuse in the boring process.

1.1.7 The TBM’s will operate on a 24 hour per day basis, excluding maintenance periods. There will be a gap between the launch of the two TBM’s. However, although they operate continuously, boring operations are subject to a series of pauses during the day for the installation of support rings and lengthening of slurry pipes.

1.1.8 The hourly slurry plant input flow rate is up to 1,250m3/h (maximum 30,000m3 per day) per TBM. On average 2,650m3 of filter cake would be generated each day with peak of up to 6,000m3 with both TBMs working. In addition, there will be approximately 1,000m3 of coarse particulates separated from the slurry generated per day, which will also be used within the proposed landscaping scheme.

1.1.9 There are no direct emissions to air, land or sewer from the process. There is the potential for releases of water to surface water, via releases to the wider site surface water management system from the treated pH adjusted buffer tank, B6.3 Such releases are only anticipated in the event that the STP has a greater volume of water stored than is currently required by TBM operations.

1.1.10 The site wide water management system sits outside the permit boundary. For completeness, excess water will be transferred from tank B6.3 to a large attenuation pond. It will be subject to passive settlement treatment and then transferred to a clean water pond, following appropriate treatment in the water treatment plant (WTP). Water from within the clean water pond will be utilised within the wider southern portal area, as far as practicable or discharged, within the requirements of the discharge consent environmental permit (EPR/QB3092NR/A001) for the pond. 2 Technical Summary 2.1.1 The STP is designed to treat slurry generated by the operation of the two tunnel boring machines used to bore the Chiltern Tunnel, which is being constructed as part of the HS2 route through Buckinghamshire. The STP will recover solid material from the slurry for landscaping purposes and regenerated (recovered) slurry for reuse in tunnelling operations. This is classified as an R5 operation. It is located at the construction

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

compound, at the southern portal of the Chiltern Tunnel, from where the TBM’s are launched.

2.1.2 The southern portal is located at National Grid Reference (NGR) TQ 02652 91119. The southern portal site to be developed is currently arable land. Adjacent land uses include the M25 motorway, 370m to the west of the site, and immediately to the south is arable land. The nearest key receptors (excluding the rest of the site, the visitor centre and worker accommodation) include: Denham Park Quarry which is located 500m to the south west of the site, HydeAway Spa located 680m to the north west of the site and residential properties off Old Uxbridge Road located 900m east of the site. The location of the site’ including the environmental permit boundary’ is detailed on Figure 1. The nearby Pynesfield Quarry and Landfill will have ceased operations by the time the STP is operational.

2.1.3 In terms of designated sites, there are no Special Areas of Conservation (SAC), Special Protection Areas (SPA) or RAMSAR sites within 10km of the southern portal. The nearest designated site is Old Park Wood SSSI which is 1.3km east of the site. The nearest Local Nature Reserve is Northmoor Hill Wood which is 2.2km south east of the site. The southern portal sits within a groundwater source protection zone, Zone 2.

2.2 Plant Overview

2.2.1 The Chiltern Tunnel is to be bored using a variable density TBMs. This type of TBM has been specifically chosen for the geology to be encountered, taking into account the chalk strata, the location of the bore below the water table for large distances and the utilisation of the water table for public water supply, which means the bore crosses a number of source protection zones. A variable density TBM relies on the hydrostatic pressure behind the cutter face, produced by a slurry, to seal the bore during progress. The slurry in this case will be a mixture of water and chalk, which mixes with the cutter debris. This mixed slurry is pumped back to the southern portal where it is regenerated for reuse and the solid material removed.

2.2.2 Slurry is transported via a hydraulic circuit by pipeline from the TBM. The slurry predominately consists of water, containing extracted geology from the boring operations. There may be trace levels of TBM related chemicals, primarily contact bearing grease from behind the cutter head which comes into contact with the slurry. The tunnelling geology is principally chalk, with some larger particles such as flint and stone within it.

2.2.3 The solid STP output is in the form of coarse particulate matter, primarily flint fragments, and gravel; and chalk filter cake from the fine particulate fraction. These materials are

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compliant with the CL:AIRE Definition of Waste Code of Practice (DoW CoP)1 and will be suitable for landscape placement. Further information on the application of the DoW CoP can be found in Appendix E. The key parameter for DoW CoP compliance from the plant, is the water content of the STP filter cake output, which must be within a pre-determined range in order to give the required engineering properties for landscape placement.

2.2.4 The STP liquid output is primarily water, which is subject to pH adjustment within the STP. During normal operation, the TBMs operate at a slight water deficit, resulting in all water from the filtration processes being reused. This recovered liquid is recirculated into the production of regenerated slurry for the TBM processes, along with treated water from the wider southern portal area drainage system. All slurry used within the TBM process must have the correct rheological characteristics for the TBM to operate correctly, which is monitored within the STP prior to slurry return.

2.2.5 There is the potential for excess water to be discharged into the site wide surface water drainage system, in the event that the volumes of water within the plant exceed the current TBM requirements. This would primarily be caused by one or both TBM being offline for an extended period for maintenance and cleaning. The release into the sitewide drainage system would be retained within the site attenuation pond. From here, it is subject to further treatment prior to storage in the clean water pond. As far as practicable, clean water from the storage pond will be utilised within the southern portal operational area. In the event that it cannot be used, excess water from the clean water point may be released into the River Colne in accordance with the relevant water discharge environmental permit (EPR/QB3092NR/A001).

2.2.6 This is a non-hazardous waste management activity, which is a non-listed activity under Schedule 1 of the Environmental Permitting (England and Wales) Regulations 2016 (EPR), due to involving the physico-chemical treatment of non-hazardous waste for the purposes of recovery.

2.3 Slurry receipt

2.3.1 Incoming slurry is pumped to the STP from the TBM through thick walled pipes from each of the two TBM’s (one incoming pipe per tunnel bore). Slurry delivery is determined through a combination of potential TBM bore progress and STP throughput. Slurry is primarily a water based fluid, with approximately 42% chalk and oversized material extracted from the tunnel bore. There may also be traces of TBM related material such as cutter greases (less than 0.000005%) dependent upon the ease of boring specific chalk strata.

1 The CL:AIRE DoW CoP provides a clear, consistent and efficient process which enables the reuse of excavated materials on-site or their movement between sites. Further information can be found at https://www.claire.co.uk/projects-and-initiatives/dow-cop

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2.4 Slurry Treatment Plant process

2.4.1 Upon arrival at the STP, the incoming slurry is subject to a de-sanding operation in order to remove larger, coarse, particulate matter, such as flint and gravel, from the predominately chalk and water mixture. This is removed from the incoming slurry in the STP through a sequential series of separation processes. Figure 4 illustrates the sequence of the processes. De-sanding processes are split across two lines, operated in parallel, one for each TBM:

• Scalping unit - The incoming slurry is treated first in a scalping unit, which removes all material greater than 6mm in size by using a trommel (a form of rotating screen). The material larger than 6mm is transferred to the stockpile area by conveyor for temporary storage. The remaining slurry is pumped to the de-sanding unit; • De-sanding unit - The de-sanding unit comprises a number of 650mm diameter cyclones. These remove material above 0.07mm-0.08mm in size. The separated material is transferred to the de-watering unit and the remaining slurry is pumped to the de-silting unit; • De-silting unit - The de-silting unit consists of a number of 250mm diameter cyclones that work in parallel. These remove material in the 0.04mm to 0.05mm size range. The separated material is transferred to the dewatering unit and the remaining slurry is stored in tanks for reconditioning/reuse in the continuing tunnel boring drive; • De-watering - The dewatering unit removes excess water from the coarse material separated by the de-sanding and de-silting processes. The unit comprises a number of vibrating screens. The screens have grids with 0.3mm or 0.6mm openings designed to capture the coarser fractions in a manner where the sand forms a filter for finer particles. Excess water will be recycled into the regenerated slurry; and • Stockpiling - The solid output from the trommels and cyclones are transferred from the separation units by covered conveyors. These materials are then combined and stockpiled together. The outputs are checked and utilised within the landscaping scheme as non-waste under the DoW CoP.

2.5 STP design

2.5.1 An indicative layout of the STP is included in Figure 3, showing the location of tanks and processing plant. Note that the drawing does not show the main tank bund. References to tank designations within this section match those on this figure. Appendix C1 shows the bund details.

2.5.2 The STP sits within the wider southern portal construction area, with which it shares infrastructure. The entire southern portal construction site is provided with security fencing and security to prevent unauthorised access. There are additional security controls to the STP from the wider southern portal, to help ensure good traffic

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management and minimise the risk of untrained staff being in the operational area. The STP surface water management system is captured for reuse within the process. The drainage is directed to tank B7 from where the drainage water is treated through solids removal prior to use in the slurry circuit. In the event of excess drainage water capture, it is send to tank B3, treated through the filter press, with filtrate water transferred to tank B6.3 for storage or release into the wider southern portal wide site drainage system.

2.5.3 The surface water drainage system is equipped with concrete / silt traps to capture particulate matter and oil separators to remove oil residues. There are a number of stopcocks within the drainage system, which may be closed off in the event of an emergency or spillage to isolate potentially contaminated material from the wider site drainage system. The drainage system within the STP is diverted to tank B7 for cleaning and reused. The wider site drainage system is subject to a separate water discharge environmental permit.

2.5.4 The STP has been purpose designed and constructed in line with the general requirements of sector guidance note s5.06. The plant consists of a number of single walled bolted steel tanks, located within a low primary bund located on a concrete slab. The slab has a sump within it, from where any liquid retained within it is pumped into tank B7.

2.5.5 Tanks are laid out with a logical flow, with some tanks duplicated to allow slurry from each TBM to be handled separately. This reduces individual tank capacity and provides a degree of redundancy for maintenance. The majority of tanks share the same structure, bolted steel construction. All steel tanks are tied into the concrete slab. The base of each tank is set within a depression within the slab. Following tank wall mounting, the joint is treated with a water proofing agent and the depression backfilled with concrete. This gives a secure, water tight joint and eliminates any failure risk of the tank lifting from the slab. Prior to use, all tanks have been water tested to demonstrate that they are water tight.

2.5.6 The only tank which is an exception is a plastic tank utilised for the storage of sulphuric acid with a capacity of 30m3 (30,000 litres). Due to potential incompatibilities, both between the tank contents and any bund contents; and the primary bund and tank construction material; the acid tank is separately bunded to 110% capacity of the acid tank. The bund has an acid resistant surface finish.

2.5.7 The plant has been designed so that all traffic, including deliveries of raw materials, are kept outside of the plant. The only exception is for forklift truck access to enable the replacement of pumps and equipment for maintenance.

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2.5.8 All pipe runs within the plant are located above ground to allow for visual inspection and monitoring. Where pipe runs cross access roads, this is at height. The incoming and outgoing slurry lines are located within channels at ground level which are equipped with covers for inspection. There is a laboratory for testing and monitoring of cake and slurry quality located at the centre of the site, along with a control room staffed 24 hours per day, with SCADA based controls for plant operation. There is a smaller control room located with the filter presses to enable closer monitoring, including visual inspection as needed, for the presses.

2.5.9 The plant includes a number of tanks and silos for the storage of raw materials used within the process. Specific coupling points have been specified for each type of silo or tank to prevent incorrect offloading. Alkali powder silos are well separated from the acid storage. (The separation distance is a minimum of 50m). The offloading points are located to be clear of the main traffic thoroughfares around the plant.

2.5.10 The de-sanding plant is located within a building, designed to minimise noise emissions from this part of the plant. The plant sits within a concrete basin designed to capture any leaks or spillages. These materials are pumped back into the start of the process for re- processing. The filter cake storage area comprises two, large, portal frame sheds which are open along one side for access.

2.6 Slurry makeup tanks

2.6.1 Some de-sanded slurry is transferred directly into the regenerated slurry tanks (B1-1 & B1-2), with its composition adjusted through the addition of treated filtrate from later in the slurry processing (tank B6-3), fresh water tank (B4), or desanded seepage water tank (B7), and any additional drilling additive requirement (e.g. bentonite for crossing M25). This slurry is then returned to the TBM for use in the boring process.

2.6.2 Each slurry makeup tank holds approximately 1,500m3.

2.6.3 The remaining de-sanded slurry is transferred to the waste mud tanks (B3-1 & B3-2) for storage prior to filtration. These tanks each hold 1,500m3 of slurry and are used to moderate flow between the TBM and filter presses.

2.7 De-sanded slurry dehydration

2.7.1 Slurry is blended with a low level of lime, approximately 0.5% of solid content, in the form of lime milk solution, in order to facilitate pressing. The milk is made on site from lime powder stored in vertical silos and water, using inline mixers. The lime milk helps to give a better separation of pressed chalk cake from the filter material. The volumes of milk added have been determined through inline density testing of the waste mud from tanks

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B3-1 and B3-2, with automatic adjustment of the lime dosing based on the slurry density and flow rate. The dosing rate has been optimised to give the correct cake properties. Following blending using inline blenders, limed slurry is transferred from the storage tanks (B3-1 & B3-2) to intermediate storage silos to regulate flow into the filter press banks. Figure 5 illustrates this process through to cake production.

2.7.2 Each filter press bank consists of a number of hydraulic filter press boxes. The filters are a mixed pack design, where membrane filter plates alternate with diaphragm pressure plates. The chambers between the filter plates are filled with slurry to a pre-set limit. Following the filter filling, the pressure plates chambers are filled with water. This has the effect of expanding the pressure plates, squeezing the filter chambers in order to remove excess water so that the cake can meet the landscaping requirements under the DoWCoP. Once the pressure plates have reached the correct pressure, the pressure is retained for a set period so as to maximise cake dehydration. The core of the plates are cleaned using air to push excess slurry back into the liquid holding tank. This minimises the risk of liquid slurry mixing with the dehydrated cake. The filter plate chambers are then opened in sequence for the cake to separate under gravity.

2.7.3 A planned preventative maintenance programme is in place for the replacement of filter fabric which becomes damaged. The maintenance programme is defined through a combination of operational experience and manufacturers recommendations.

2.7.4 The filter cake is transferred from the release area using front loading shovels, into one of two large storage sheds located at the site. The cake is subject to moisture level checking prior to transfer to the landscaping areas. In the event that the measured cake moisture level is too high, cake may be dosed with a low percent of lime powder, prior to storage and placement. In order to construct haul roads within the landscaping areas, some chalk cake will be dosed with cement powder prior to placement. In the event chalk cake is dosed with cement, following mixing, the material remains within the storage sheds for up to 5 days to allow for curing of the cake.

2.7.5 The filtrate from the filter presses is captured within the filter press area, and transferred by pipeline to a dedicated filtrate tank, B6-1, which has a capacity of 1,500m3. The produced filtrate is strongly alkaline, with a pH up to 12.6 (dependent upon chalk strata and required lime milk dosing). Filtrate is transferred in a batch process to the pH control tank (B6-2,500m3). The transfer pipework is linked to sulphuric acid storage tanks, allowing acid to be added via an inline mixer to the transferred filtrate in order to reduce the pH. The contents of the pH control tank are subject to recirculation from base to top to ensure that complete mixing of the batch occurs. Following recirculation, the pH is checked. Once the pH has been reduced to a level where is it suitable for reuse, which is approximately pH 8.5 - 9, the batch is transferred to the controlled pH tank (B6-3,

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1,500m3) prior to transfer to the regenerated slurry tanks (B1-1 & B1-2) prior to use in the TBM processes.

2.7.6 There is a clean water tank, tank B4 within the STP, which has capacity of 500m3. It is primarily a backup water supply tank, for cases where the filtrate water tank (B6.3) has insufficient water to meet requirements. Uses of this tank contents will include cooling and flushing of the pumps within the STP, cleaning of the trommel.

2.8 Dirty water cleaning

2.8.1 The buffer tank B7, is used for the storage of ‘thin slurry’, primarily water, from non-slurry sources within the STP. This will include cleaning operations within the STP; cleaning arisings within the tunnels; and other water arisings within the tunnels such as seepage during construction of the cross passages. In the event of any leaks or spillages within the STP operational area, these materials will also be transferred to tank B7.

2.8.2 Liquids stored within B7 are generally captured within the drainage system of the STP and tunnel, and transferred to the tank, via a small de-sanding unit located on the top of the main slurry de-sanding plant. Separated materials from the de-sander are transferred into the slurry treatment processes at the STP. Liquids within tank B7 are transferred to tanks B1-1 and B1-2 for incorporation into the regenerated slurry. If there is no outlet into these tanks due to the TBM’s being offline for a sustained period, then the tank’s contents are diverted through the filter presses for dehydration and landscape placement. Excess water can also be transferred to the site wide settlement pond, where it is stored prior to cleaning and either reuse within the wider site or release into the environment under the terms of a discharge consent environmental permit.

2.8.3 The STP has been designed to be as robust as possible, in order to minimise the risk of the TBM’s being required to stop due to a lack of slurry treatment capacity. The individual banks of filter presses can be isolated for maintenance purposes, or in the event of a filter break down. The secondary control unit is located at the filter banks for this purpose. A range of routine filter spares are stored at the site, in order to minimise operational delays due to loss of a filter bank. In the event that a filter cloth fails, the bank will be isolated until the filter cloth has been replaced. Any slurry which is spilt to the ground will be removed and returned to the incoming slurry tank for processing. Any liquids from the spillage will be captured within the site drainage system.

2.9 Use of polymers

2.9.1 It is currently planned that following operational trials, polymers will be used to aid the pressing of the cake, rather than lime. Although laboratory scale trials have demonstrated the viability of this approach, operational trials need to be undertaken in order to confirm

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cake separation from the filter material. The MSDS for the proposed polymer is included as Appendix H.

2.9.2 Polymer dosing would occur at a lower level than lime (approx. 0.075-0.125kg/tonne dry solids against approx. 50kg/tonne dry solids for lime). The filtrate would also be close to neutral pH following pressing and therefore, acid neutralisation of the filtrate would no longer be required.

2.9.3 The laboratory data shows that the polymer treated cake will be suitable for landscape placement.

2.9.4 We wish to request a pre-operational condition, for a trial of the polymer-based additive. This trial will involve the use of polymer within the process, at differing concentrations to determine the practicalities and optimal use of polymer. The trial will be followed by a written report detailing the proposed concentration of polymer to be used within the trial and demonstrating that there is no impact on the quality of the filter cake.

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3 Application Forms 3.1 Form A 3.2 Form B2 3.3 Form B4 3.4 Form F1

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4 Additional Information 4.1 Application Overview 4.2 EPR Application Form A

5 Applications from companies or corporate bodies 5a Name of the company 5b Company registration number 4.2.1 As the Align JV is not registered on Company’s House, this application is made jointly in the name of the three partner organisations as below, with each completing its own form A. The three international and privately-owned infrastructure companies are:

• Bouygues Travaux Publics (Company number FC027790)(13/06/2007): UK establishment number BR009556, Becket House, 1 Lambeth Palace Road, London SE1 7LB. • VolkerFitzpatrick Limited (Company number 02387700)(22/05/1989); Hertford Road, Hoddesdon, Herts, EN11 9BX, • Sir Robert McAlpine Limited (Company number 00566823)(31/05/1956). Eaton Court, Maylands Avenue, Hemal Hempstead, Herts, HP2 7TR

4.2.2 Letters of support from all three bodies are provided (in Appendix B), to show that the constituent bodies are permitting a nominated person to apply for the environmental permit on their joint behalf.

4.2.3 For brevity in this application, the applicant is referred to as the Align JV throughout.

5c Please give details of the directors 4.2.4 Bouygues Travaux Publics

• Christian Gazaigues 4.2.5 VolkerFitzpatrick Limited

• Volerwessels UK Ltd • Naomi Anne Connell • John Anthony Cox • David John Griffin • Ceri Suzanne Humphrey • Richard Andrew Offord • Alan Robert Robertson

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• Matthew Gordon Woods

4.2.6 Sir Robert McAlpine Limited

• John Alistair Dempsey • Kevin John Pearson • Karen Joy Brookes • Alison Lucia Cox • Paul Christopher Hamer • Hector George McAlpine • Robert Edward Thomas William McAlpine • James Leighton More

4.3 EPR Application Form B2

1 About the permit 1a Discussions before your application 4.3.1 The pre-application number is EAWML 404489

2 About the site (but not mobile plant) 2a What is the site name, address, postcode and national grid reference? 4.3.2 Chiltern Tunnel Southern Portal Slurry Treatment Plant, Chalfont Lane, Maple Cross, Hertfordshire WD3 9XN

4.3.3 National Grid Reference (NGR) TQ 02652 91119

3 Your ability as an operator 3a Relevant offences 4.3.4 There have been no relevant offences committed by the organisation

3b Technical ability 4.3.5 Sophia Postoyko is currently undertaking a Level 4 WAMITAB certificate. Evidence is provided in Appendix G.

3c Finances 4.3.6 No relevant persons for the organisation have current or past bankruptcy or insolvency proceedings against them.

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

3d Management systems 4.3.7 Yes.

4.3.8 The operation of the STP will be undertaken by ALIGN for the delivery of package, which encompasses 22 km of the HS2 route through Buckinghamshire, including the Chiltern Tunnel. The STP will be operated within the requirements of contract wide Environmental Management Plan (EMP) and the site specific EMP for the wider southern portal main works site, developed to comply with the requirements of the ALIGN Environmental Management System (EMS).

4.3.9 The ALIGN EMS operates under and accords with the requirements of the Bouygues Travaux Public (BY TP) EMS which is certified to ISO 14001:2015. The EMS Manual describes how ALIGN’s strategic and corporate environmental and sustainability obligations will be managed during the design and construction phases of the C1 Package of HS2 Phase 1. The EMS Manual sets out a framework of environmental management provisions designed to document the planned strategy and to direct ALIGN and its subcontractors in the development and implementation of environmental management/control plans and procedures required to deliver the project.

4.3.10 A Contract Wide EMP for the C1 package will provide a framework to ensure compliance and control of environmental aspects and impacts of works associated with package C1.

4.3.11 Site specific control measures shall be included within Site Specific Environmental Management Plans (SS-EMPs) which are particular to each ALIGN worksite. The SS-EMPs will be developed to cover work site specific activities and detail site specific control measures and for specific tasks which constitute a high risk to the environment or work packages to be conducted by subcontractors.

4.3.12 At a local level, site-specific control measures are included within Local Environmental Management Plans (LEMPs), which are particular to each local authority area along the route of the railway. The LEMPs were initially developed in consultation with the relevant stakeholders

4.3.13 The hierarchy of documentation under the ALIGN EMS is outlined in the figure below.

Figure 1 : ALIGN EMS Document Hierarchy

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

4.3.14 Operations within the STP will be subject to monitoring and auditing, internally from the ALIGN auditing function, and through independent monitoring from environmental auditors commissioned by HS2.

4.3.15 The Management Systems Team (EMS specialists) have overall ALIGN responsibility for the management and upkeep of the EMS. Compliance with specific elements of environmental legislation is managed by the relevant sections with the organisation. The Management Systems Team maintain a Legal Register and, in consultation with Operations Teams, their permit compliance advisors and other specialists, assess environmental risks for in-scope areas using a significance scoring method under normal, abnormal and emergency conditions. Significant environmental aspects and impacts take into account legal and other requirements, cost to the business, HS2 requirements, scale of impact and interested parties. The Standards and other relevant information are communicated through a number of routes. Incident and corrective action routes exist to promote continual improvement.

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

4.3.16 The defined roles and responsibilities are allocated to relevant personnel, depending on their job description, qualifications, knowledge, experience and training. Training and competency are based on specific roles.

4.3.17 There is a planned preventative maintenance (PPM) program for the STP, based on a combination of manufacturers recommendations and previous experience of operating STP type plants for the treatment of TBM generated arisings. Maintenance will be recorded and monitored on a corporate maintenance management database, which will generate daily, weekly and monthly task sheet for the maintenance teams. Completion of maintenance will be recorded on the system, as will any plant related operational issues and the outcome sf root cause analysis of faults in order to pro-actively modify the PPM regime to reflect the requirements of the STP and the specific geology it treats.

4.3.18 Staff implementing the PPM regime are appropriately trained for the tasks they undertake. All staff involved in the operation of the STP will have a detailed understanding of the operational procedures for the plant for both normal and abnormal operation, as well as the specific requirements of the environmental permit and the site specific EMP. As part of the training, operators will receive specific instructions relating to those aspects of plant operation that have the potential for a negative impact on the environment. Records will be kept of staff training, including refresher training.

4.3.19 Where contractors undertake work at the STP, including the delivery of raw materials, they will undergo induction training specific to the southern portal and operations at the STP as appropriate. All contractors will be subject to pre-screening to confirm that they meet the requirements to be on the approved suppliers list. Contactors are required to submit a method statement prior to commencement of any work, identifying how work is to be undertaken and the associated risks. The method statement must be approved by the STP Manager and the Environmental Manager on a risk assessed basis, who will also identify any site hazards and issue an Authorisation to Work/Enter the site, following a site induction. When on-site, the contractor must carry this Authorisation to Work at all times.

5 Supporting information 5a Provide a plan or plans for the site 4.3.20 Plans are provided in Appendix B and C

• Figure 1 – Site Location Plan • Figure 2 – Permit Boundary • Figure 3 - Site Layout

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

5b Provide the relevant sections of a site condition/baseline report if this applies (see the guidance notes on part B2 for what needs to be marked on the plan) 4.3.21 See Appendix F

5c Provide a non-technical summary of your application 4.3.22 See Section 1

5d Are you applying for an activity that includes the storage of combustible wastes? 4.3.23 No

6 Environmental risk assessment Environmental risk assessment 4.3.24 The Magic.gov.uk website was accessed in July 2018. The following sites were identified as being within the appropriate distances of the site:

Table 1: Summary of designated sites

Site Name Designation Distance from the Site

Northmoor Hill Wood Local Nature Reserve (LNR) 2,200m south east

Stockers Lake Local Nature Reserve (LNR) 2,300m north east Old Park Wood Site of Special Scientific Interest (SSSI) 1,300m east

Mid Colne Valley (‘Unfavourable declining’ Site of Special Scientific Interest (SSSI) 1,200m south east condition)

Mid Colne Valley Site of Special Scientific Interest (SSSI) 1,800m south east

Harefield Pit (‘Unfavourable declining’ Site of Special Scientific Interest (SSSI) 2,500m south east condition) 4.3.25 There are no SAC, SPA or Ramsar designated sites within 10km of the site.

4.3.26 The site sits within a groundwater source protection zone 2, although it is located within 100m of source protection zone 1

4.3.27 The site is located in an area designated as flood zone 1, i.e. with a risk of flooding greater than 1:1000 per annum.

4.3.28 The site sits outside any AQMA designated by the Local Authority. However, the site is located within 600 of the M25 motorway.

4.3.29 Key nearby receptors which have also been identified excluding the rest of the site including the visitors centre and worker accommodation and are detailed in Table 2.

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

Table 2: Summary of receptor sites

Receptor Distance from the Site

Denham Park Quarry 500m south west

HydeAway Spa 680m north east

Residential properties located off Old Uxbridge Road 900m east

Properties located on Tilehouse Lane 1,300m south east

4.3.30 There is an overlap between environmental risks and risks associated with accidents, as required by an accident assessment for the facility. These two assessments have been combined into a single table below to reflect the overlap and minimise repetition.

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Extremely Unlikely 1 2 3 4 5 6

Very Unlikely 2 4 6 8 10 12

Unlikely 3 6 9 12 15 18

Somewhat Unlikely 4 8 12 16 20 24

Fairly Probably 5 10 15 20 25 30

Probable 6 12 18 24 30 36

Table 4: Assessment scores interpretation Risk Score Magnitude of Risk Consideration

Low or negligible levels of risk, low or negligible impacts. Adherence to good operational practices will 6 or less Insignificant adequately control these risks Lower level of possible impact, but major severity or high likelihood would require consideration of 8 – 12 Acceptable actions to reduce risk Combination of high likelihood or major impact would require further assessment and possible actions to 15 - 20 Unacceptable reduce risk Immediate resolution required 24 or more Severe

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

Table 5: Overall assessment scores Accident Scenario Pathway / Receptor Control Measure (Risk Likelihood Consequence Residual Actions to Take if Incident Does (Hazard) Management) Risk Score Occur Air emissions

In the event of an incident the following control measures may be implemented: • identify the source of the Odour from site Air transport and The nature of the waste is not 2 1 2 odour; operations inhalation to site workers expected to give rise to odours. • remove source of odour from site as soon as practicable • site workers – monitoring and PPE;

Dust on roads generated from vehicle movements In the unlikely event of dust All vehicles removing material generation caused by vehicle Releases of dusts or from the site will be covered. movements, roadways will be particulate matter Air transport and 3 2 6 from incoming inhalation Moisture content would be swept and/or dampened down /outgoing vehicles controlled therefore material as appropriate to prevent the would not become dusty mobilisation of dust during dry and windy weather Observations for dust will be undertaken daily.

Releases of dust or Silos have particle filters fitted particulate matter Should dust be noted the Air transport and to them to prevent releases from loading and 3 2 6 inhalation following control measures will unloading of lime Silos are installed with KCR be implemented: in silos system to close inlet pipes in

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01 Accident Scenario Pathway / Receptor Control Measure (Risk Likelihood Consequence Residual Actions to Take if Incident Does (Hazard) Management) Risk Score Occur case of pressure buildup or • site workers – PPE and dust masks; and high level alarms during loading • damp down/cover materials Appropriate training delivered to all staff

Supervised delivery

Procedure for delivery

Signage

A spill clean-up procedure is in place to minimise the impact from spills and leaks.

Although dropped from the filters, cake is unlikely to produce dust as the treated In the event of any excess dust slurry will still have a moisture this the following control Releases of dust or Air transport and content of approximately 25% particulate matter 3 2 6 measures will be implemented: inhalation from cake storage The cake will be stored in a • site workers – PPE and dust covered three sided building. masks; and • cover materials Observations for dust will be undertaken daily.

Driver permit to work Release of Maintenance of filter system Release to atmosphere, Supervised delivery powdered lime 2 4 8 site staff No filling of silos in the event of during offloading Procedure for delivery a loss of filter integrity Signage

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01 Accident Scenario Pathway / Receptor Control Measure (Risk Likelihood Consequence Residual Actions to Take if Incident Does (Hazard) Management) Risk Score Occur Silos are installed with KCR system to close inlet pipes in case of pressure buildup or high level alarms during loading

Powder blown into tank from delivery tanker

Storage silo equipped with dust filter on breather pipe to minimise risk of accidentally release Noise and Vibration

Noise and vibration are not considered to be a risk as the slurry treatment plant’s main systems are enclosed within Nuisance to site workers 3 2 6 noise insulation panels and Implement site planned therefore unlikely to generate preventative maintenance (PPM) Slurry Treatment noise that would be considered Plant (noise and procedures, developed in to be a nuisance for site vibration) conjunction with the plant workers or local residents. manufacturer The STP is also located within a cutting in the landscape. Complaints from local 3 1 3 residents The wider southern portal area is covered by a specific Section 61 agreement relating to noise

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01 Accident Scenario Pathway / Receptor Control Measure (Risk Likelihood Consequence Residual Actions to Take if Incident Does (Hazard) Management) Risk Score Occur Relevant plant and equipment will be fitted with appropriate sound attenuation and acoustic isolation, and will be subject to regular inspection and maintenance schedules to maintain operational performance.

Staff will use appropriate PPE where necessary

Observations for noise and vibration to be undertaken daily. Implement site management systems Noise and vibration Complaints from local Relevant plant and equipment from the trommel residents 5 2 10 will be fitted with appropriate Trommel equipment will be machinery Internal noise issue sound attenuation and acoustic checked for operational isolation, and will be subject to performance regular inspection and maintenance schedules to maintain operational performance.

Observations for noise and Noise and vibration Implement site management vibration to be undertaken from conveyor Complaints from local systems dropping material residents daily. 3 1 3 into the sand and Internal noise issue Conveyor will be checked for Relevant plant and equipment gravel pile operational performance will be fitted with appropriate

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01 Accident Scenario Pathway / Receptor Control Measure (Risk Likelihood Consequence Residual Actions to Take if Incident Does (Hazard) Management) Risk Score Occur sound attenuation and acoustic isolation, and will be subject to regular inspection and maintenance schedules to maintain operational performance.

Vehicles (such as the front end shovel loader and tippers) will be subject to regular maintenance and service schedules.

Vehicles will be fitted with white noise reversing alarms and Noise from vehicle Complaints from local Implement site management noise reduction equipment 4 2 8 movements residents systems All roadways and car park surfaces will be existing roadways and impermeable hardstanding will be fully maintained with no significant undulations. Speed limits will be in place. Water

Any repairs would be recorded Contaminated The cake will be stored on Contaminated run-off and carried out runoff/rainwater 3 3 9 from cake stored on site hardstanding with sealed from site surfaces Contaminated water from the drainage. site is captured in the drainage

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01 Accident Scenario Pathway / Receptor Control Measure (Risk Likelihood Consequence Residual Actions to Take if Incident Does (Hazard) Management) Risk Score Occur All surfaces will be inspected system and treated within the regularly for signs of portal wide water treatment deterioration or run-off. plant. The drainage system is

External activities will be equipped with concrete silt traps located on impermeable to capture suspended solids. hardstanding and all potentially Clean water from non- polluting substances will be operational areas goes into the contained in tanks provided wider site drainage system with dedicated secondary containment

Operational procedures will ensure the drainage system and condition of the hard standing areas are inspected regularly by the Site Manager and shift supervisors and any damage is repaired and recorded.

The cake will be stored on in covered three sided buildings on hardstanding (concrete) with Excess water arising Migration through soil to Any repairs would be carried out sealed drainage. from treated filter groundwater/surface 3 3 9 and recorded Any filtrate produced will be cake/spoil water Implement corrective action pumped back to the slurry treatment plant where it will be reused in the system.

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01 Accident Scenario Pathway / Receptor Control Measure (Risk Likelihood Consequence Residual Actions to Take if Incident Does (Hazard) Management) Risk Score Occur Where excess water is generated it is transferred to the wider site sedimentation pond for filtration and checking from tank B6.3, prior to either reuse within the wider site, or release into the wider environment

Potential emissions to The site sits within Flood Zone water courses, stopped Flood status of area to be Flooding 1, that is the risk of flooding is 1 1 1 production resulting in monitored greater than 1:1000 years. increased waste

Chemicals and oils are stored Implement corrective action within secure units and Documented procedures to Percolation through soils, provided with secondary prevent releases direct run-off from site containment, bunded to 110% Chemicals and oils Inform relevant authorities if across the ground and Regular inspections of 3 3 9 stored on site required entering surface water or containment will identify leaks. Appropriate spill kits and drain groundwater A spill clean-up procedure is in covers located nearby and staff place to minimise the impact trained in their use from spills and leaks.

Bund / Documented procedures to containment failure Monthly integral bund integrity prevent releases Release to surface water 2 4 8 of sulphuric acid, checks of separate bund. Inform relevant authorities if tank required

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01 Accident Scenario Pathway / Receptor Control Measure (Risk Likelihood Consequence Residual Actions to Take if Incident Does (Hazard) Management) Risk Score Occur Bund coated with acid resistant Appropriate spill kits and drain material to minimise risk of covers located nearby and staff failure in the event of a spillage. trained in their use

Regular drainage of rainwater for externally bunded tanks

Documented procedures to Driver permit to work prevent releases Supervised delivery Specification of acid proof Procedure for delivery surfacing used to prevent Spillage of Signage environmental release sulphuric acid, Release to surface water 2 5 10 Unique coupling for tanks to Inform relevant authorities if during delivery prevent incorrect filling required Pressure transfer line from the Appropriate spill kits and drain tank with feed pipe reducing covers located nearby and staff the risk of any drips. trained in their use

Documented procedures to prevent releases Spillage of other Driver permit to work materials during Appropriate spill kits located Supervised delivery delivery or in Release to surface water 2 4 8 nearby and staff trained in their Procedure for delivery storage (typically use Signage IBCs or drums) Inform relevant authorities if required

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Specific staff training on moving and pollution prevention procedures Implement site management systems Drum / IBC Daily monitoring Communication procedures to dropped by forklift Release to on-site Integrity check for drums and 4 3 12 inform relevant authorities e.g. or other moving drainage system IBCs delivered on site Environment Agency, Affinity equipment Awareness training provided for Water, Local Authority (if staff required) Internal communication procedures within Crisis Manual

Specific staff training on monitoring and pollution Conduct internal investigations prevention procedures and remedy faults

Daily monitoring Documented procedures to Integrity check of hydraulic prevent releases Hydraulic line Release of hydraulic fluid lines 3 3 9 Inform relevant authorities if failure (water) Awareness training provided for required staff Appropriate spill kits and drain Pressure monitoring of covers located nearby and staff hydraulic lines within the filter trained in their use banks in SCADA system

Specific staff training on Hydraulic line Release of hydraulic fluid Conduct internal investigations monitoring and pollution 3 3 9 failure (water) and remedy faults prevention procedures

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Integrity check of hydraulic prevent releases lines Inform relevant authorities if

Awareness training provided for required staff Appropriate spill kits and drain

Pressure monitoring of covers located nearby and staff hydraulic lines within the filter trained in their use banks in SCADA system

All STP tanks are on bunded hardstanding with sealed drainage and therefore any spillages will be contained.

Spilled water would be Documented procedures to transferred to the wider site prevent releases drainage system for storage and treatment in the Inform relevant authorities if Failure of water Release of water sedimentation pond 3 2 6 required tanks Specific staff training on Appropriate spill kits and drain moving and pollution covers located nearby and staff prevention procedures trained in their use

Daily monitoring

Integrity check of water tanks

Awareness training provided for staff

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01 Accident Scenario Pathway / Receptor Control Measure (Risk Likelihood Consequence Residual Actions to Take if Incident Does (Hazard) Management) Risk Score Occur Monthly integral bund integrity checks Other Environmental

Litter are not considered to be an issue due to the nature of If any litter is found it will be wastes the site will be treating. picked up by staff. Any issues Transportation through However, the site will be identified will be recorded, Litter 1 1 1 the air and over land carefully managed including investigated and appropriate good housekeeping procedures remedial action will be taken as and regular checks will be made soon as practicable. within and around the site for any litter/debris.

Pests are not considered to be If pests are found to be a Pests (flies, vermin, Transportation through an issue due to the nature of 1 1 1 problem at the site remedial birds) the air and over land wastes the site will be treating. action would be taken

Accident

All slurry lines routed above Conduct internal investigations ground and located clear of and remedy faults Wastage, release of slurry vehicle routes to minimise the Failure of slurry Line isolated until leaking section on site, damage to slurry risk of damage. 3 3 9 lines replaced with spare line. lines Daily visual monitoring of all Inform relevant authorities if slurry lines to identify any faults required or leaks

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01 Accident Scenario Pathway / Receptor Control Measure (Risk Likelihood Consequence Residual Actions to Take if Incident Does (Hazard) Management) Risk Score Occur Checking of pressure in the flow Spilled material cleaned as soon lines looking for blockages and as possible following release

pipe failure Appropriate spill kits and drain Integrity check of slurry lines covers located nearby and staff

Awareness training provided for trained in their use staff

Pump lines will be able to isolated and switched in the event of issues with the slurry lines

Mitigated by the use of Conduct internal investigations trommel, cyclones and and remedy faults dewatering screens Documented procedures to Specific staff training on Failure of filters – prevent releases Wastage, damage to moving and pollution damage from 3 2 6 Inform relevant authorities if filters prevention procedures stones required Daily monitoring Appropriate spill kits and drain Integrity check of filters covers located nearby and staff Awareness training provided for trained in their use staff

Specific staff training on Conduct internal investigations Failure of filters – operation and maintenance Wastage, damage to and remedy faults general wear and along with pollution prevention 3 3 9 filters Stop using filter bank until filer tear procedures fabric has been replaced Daily monitoring

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01 Accident Scenario Pathway / Receptor Control Measure (Risk Likelihood Consequence Residual Actions to Take if Incident Does (Hazard) Management) Risk Score Occur Integrity check of filters Documented procedures to

Awareness training provided for prevent releases staff Inform relevant authorities if

Pressure monitoring of required hydraulic lines within the filter Appropriate spill kits and drain banks in SCADA system covers located nearby and staff

Spare parts available on site trained in their use

The slurry tanks are on bunded hardstanding with sealed drainage and therefore any spillages will be contained. Documented procedures to Specific staff training on prevent releases moving and pollution Inform relevant authorities if Failure of slurry prevention procedures Release of slurry 3 3 9 required tanks Daily monitoring Appropriate spill kits and drain Integrity check of slurry tanks covers located nearby and staff Awareness training provided for trained in their use staff

Monthly integral bund integrity checks

All STP tanks are on bunded Failure of filtrate hardstanding with sealed Documented procedures to Release of filtrate 3 4 12 tanks drainage and therefore any prevent releases spillages will be contained.

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01 Accident Scenario Pathway / Receptor Control Measure (Risk Likelihood Consequence Residual Actions to Take if Incident Does (Hazard) Management) Risk Score Occur Specific staff training on Appropriate PPE available for moving and pollution staff in the event of spillages of prevention procedures alkaline filtrates

Daily monitoring Inform relevant authorities if

Integrity check of filtrate tanks required

Awareness training provided for Appropriate spill kits and drain staff covers located nearby and staff trained in their use Monthly integral bund integrity checks

Visual inspection of filter cake Addition of more lime to the Failure of filter cake by site staff to check for quality material either pre or post Wastage, damage to not forming Filter press system monitoring 2 1 3 pressing filter cake properly and laboratory testing of Increase in filter press duration outputs to increase filtrate removal

Delivery of Notify relevant authorities e.g. Wastage, adverse incorrect materials There are no liquid alkali tanks local emergency services chemical reaction, 1 1 1 (acid mixed with on site Implement site management potential emissions. alkali) systems

Contractor Induction and Accidental communication Switch off system activation of Internal noise issue 4 3 12 Weekly tests of plant and fire Repair any faults to system alarms/sirens alarms

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Site is mainly dealing with liquids and sludges of a non- Transportation through hazardous nature the air of smoke then Activities will be managed and A pollution incident control plan inhalation. Spillages and operated in accordance with a will be implemented as part of Accidental contaminated firewater management system (which the site’s EMS to manage fire/explosion by direct run off from shall include site security foreseeable risks from the causing the release site. measures to prevent installation of polluting Site employees Users of unauthorised access). 4 3 12 The site management system will materials to air local amenity areas All plant and equipment and include procedures and actions (smoke or fumes), Members of the public electrical installations will be required in the event of fire or water or land and local residents. kept maintained and in good spillage to control and minimise Nearby natural habitats. working condition and subject their spread. Unauthorised users of to routine inspection and site equipment. maintenance. Good housekeeping measures will be employed across the site.

An Accident Management Plan will be compiled to manage Impact from on-site Documented procedures to foreseeable risks from the machinery and prevent releases Damage to bunding and installation. vehicles hitting 3 3 9 Appropriate spill kits located kerbing on-site General traffic movements on bunding and nearby and staff trained in their site will be in accordance with kerbing on site use site rules including use of one- way system for all traffic.

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Drivers/visitors to the site will be given health and safety inductions and instructions on safe routing

Activities will be managed and operated in accordance with a management system (which will include site security measures to prevent unauthorised access).

An Accident Management Plan will be compiled to manage Reversing white noise squawkers would be used Impact from on-site Drivers, on-site staff foreseeable risks from the machinery and Local human population installation. Inform relevant authorities if 3 4 12 vehicles hitting after gaining Site security measures to required people unauthorised access prevent unauthorised access Conduct internal investigations

will include security locks on the main building and fencing of the outside storage area.

General traffic movements on site will be in accordance with Site rules.

Appropriate signage for vehicles will be provided

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01 Accident Scenario Pathway / Receptor Control Measure (Risk Likelihood Consequence Residual Actions to Take if Incident Does (Hazard) Management) Risk Score Occur Drivers/visitors to the site will be given health and safety inductions and instructions on safe routing

24-hour plant operation with challenge culture for visitors Damage to plant Address any specific equipment without passes equipment with potential damage Vandalism for release to 24-hour security for quick 3 1 3 Inform relevant authorities response atmosphere, water and Reinstate any security measures ground CCTV damaged Full perimeter fencing

6b Climate change risk screening 4.3.31 The plant will have an operational lifespan of under 5 years, therefore there is no requirement to carry out climate change risk screening on the facility. However, the facility sits outside flood risk zones and does not need a water abstraction for its operation.

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

4.4 EPR Application Form B4

1 What waste operations are you applying for? Table 1a – Waste operations which do not form part of an installation

Table 6: Waste operations which do not form part of an installation Annex I (D codes) and Hazardous waste Non-hazardous waste Name of the waste Description of the Annex II (R codes) and treatment capacity treatment capacity operation waste operation descriptions (if this applies). (if this applies).

R5 Recycling / reclamation of other inorganic materials (soil and geology Recovery of chalk recovery) Daily treatment capacity and geology from is 60,000m3 Chiltern Tunnel South boring operations R13 Storage of waste Portal Slurry through application None pending any of the (approx. 81,000 tonnes, Treatment Plant of size separation operations numbered with a density of processes and R1 to R12 (excluding 1.35tonne/m3) pressure filtration temporary storage, pending collection, on the site where the waste is produced)

For all waste Total storage capacity 11,000m3 (slurry / liquid) operations 12,500m3 (cake storage)

Annual throughput (tonnes each year) 29,565,000 tonnes of raw slurry (assumes a density of 1.35 tonnes/m3) of incoming slurry)

Table 1b – Types of waste accepted and restrictions

Table 7: Types of waste accepted at the site

Waste code Description of waste

17 05 04 Soil and stones other than those mentioned in 17 05 03; arising solely from the operation of tunnel boring machines

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

2 Emissions to air, water and land Table 2 – Emissions

Table 8: Emissions Point source emissions to air

Emission point Source Parameter Quantity Unit reference and location

None

Point source emissions to sewers, effluent treatment plants or other transfers off site

Emission point Source Parameter Quantity Unit reference and location

None

Point source emissions to water (other than sewers)

Emission point Source Parameter Quantity Unit reference and location

T1 Discharge from tank pH <9 N / A B6.3 (Buffer tank)

Point source emissions to land

Emission point Source Parameter Quantity Unit reference and location

None

Supporting information 3 Operating techniques 3a Technical standards Table 3 – Technical standards

4.4.1 Sector Guidance Note IPPC S5.06; Guidance for the Recovery and Disposal of Hazardous and Non Hazardous Waste. V5, 2013

4.4.2 Environment Agency Environmental Permitting Guidance: Risk assessments for your environmental permit

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Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

4.4.3 The CL:AIRE Definition of Waste Code of Practice (DoW CoP) The Definition of Waste: Development Industry Code of Practice Version 2, March 2011

3b General requirements 4.4.4 The risk assessment detailed above does not show that emissions need to be controlled by emissions limits. Therefore, there is no management plan for such emissions.

4.4.5 There is no requirement for a fire management plan at the site, due to the nature of the waste handled.

4.4.6 There are no requirements for an odour management plan at the facility.

4.4.7 There is no requirement for a noise or vibration action plan at the facility. There are commitments on minimising the impacts of both noise and vibration at the site as part of the Section 61 agreement at the site.

General information 4 Monitoring 4a Describe the measures you use for monitoring emissions by referring to each emission point in Table 2 above 4.4.8 There is no requirement for routine monitoring.

Appendix 2 – Specific questions for waste facilities that accept hazardous waste 4.4.9 The site only accepts non-hazardous boring wastes generated from the boring of the Chiltern Tunnel. Therefore, the questions detailed in Appendix 2 do not apply.

4.4.10 The procedures and guidance within guidance document s5.06 have been followed as far as applicable, accepting that the permitted activity is the treatment of a single waste stream generated from the boring of the Chiltern Tunnel. Site investigation works undertaken on the tunnel route have identified the nature and type of chalk which will be encountered during boring operations. The output of these investigations has been used to optimise the STP processes, particularly aspects such the filter press pressure and filtration duration that impact on the quality of the cake produced.

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Appendix A – Letters of Authorisation

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B.1 Figure 1 – Site Location Plan

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B.2 Figure 2 – Permit Boundary

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Appendix D– BAT Conclusions Applicability

D.1.1 An outline BAT assessment has been carried out on the proposed Slurry Treatment Plant at the South Portal, to identify if there are BAT requirements which may impact on the plant design. D.1.2 This review has been undertaken using the following: • Environment Agency (2013) s5.06 Guidance for the Recovery and Disposal of Hazardous and Non Hazardous Waste; and • Industrial Emissions Directive 2010/75/EU (Integrated Pollution Prevention and Control) - Best Available Techniques (BAT) Reference Document for Waste Treatment Final Draft (October 2017).

Table 1 – BAT consideration using s5.06 Guidance for the Recovery and Disposal of Hazardous and Non Hazardous Waste

BAT Conclusion BAT Scope Design Requirements Y / N?

Indicative BAT Procedures must be in place for the regular inspection and maintenance Y requirements for of storage areas, including drums, vessels, pavements and bunds. waste storage Inspections should pay particular attention to signs of damage, deterioration and leakage. Records should be kept detailing action taken. Faults must be repaired as soon as practicable. If containment capacity or capability of bund, sump or pavement is compromised, (unless effecting a repair is more expedient and working with wastes in close proximity does not compromise safety), then waste must be immediately removed until the repair is completed. Containers should be stored in such a manner that leaks and spillages Y could not escape over bunds/edge of the sealed drainage area. Bulk storage vessels should be located on an impervious surface that is Y resistant to material being stored, with sealed construction joints within a bunded area with a capacity at least 110% of the largest vessel or 25% of the total tankage volume, whichever is the greater. All connections between vessels must be capable of being closed via Y suitable valves. Overflow pipes should be directed to a contained drainage system, which may be the relevant bunded area, or to another vessel provided suitable control measures are in place. Indicative BAT All above-ground tanks containing liquids whose spillage could be Y requirements for harmful to the environment should be bunded. Bunds should: control of fugitive be impermeable and resistant to the stored materials; emissions to water have no outlet (that is, no drains or taps) and drain to a blind collection point; have pipework routed within bunded areas with no penetration of contained surfaces; be designed to catch leaks from tanks or fittings;

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have a capacity greater than 110 percent of the largest tank or 25 percent of the total tankage, whichever is the larger; be subject to regular visual inspection and any contents pumped out or otherwise removed under manual control after checking for contamination; where not frequently inspected, be fitted with a high-level probe and an alarm, as appropriate; where possible, locate tanker connection points within the bund, otherwise provide adequate containment; be subject to programmed engineering inspection (normally visual, but extending to water testing where structural integrity is in doubt). Indicative BAT Effective operational and maintenance systems should be employed on all Y requirements for aspects of the process whose failure could impact on the environment, in management particular there should be: documented procedures to control operations that may have an adverse impact on the environment a defined procedure for identifying, reviewing and prioritising items of plant for which a preventative maintenance regime is appropriate documented procedures for monitoring emissions or impacts a preventative maintenance programme covering all plant, whose failure could lead to impact on the environment, including regular inspection of major ‘non-productive’ items such as tanks, pipework, retaining walls, bunds ducts and filters Indicative A formal structured accident management plan should be in place which Y requirements for covers the following aspects: accidents and A - Identification of the hazards abnormal emissions from plant or equipment (e.g. leakage from joints, over- operation pressurisation of vessels, blocked drains) failure of containment (e.g. physical failure or overfilling of bunds or drainage sumps); B - assessment of the risks C - identification of the techniques necessary to reduce the risks There should be appropriate secondary containment (e.g. bunds, catchpits, building containment). Spill contingency procedures should be in place to minimise accidental release of raw materials, products and waste materials and then to prevent their entry into water. accumulations of liquids in bunds, sumps, etc., should be dealt with promptly Indicative BAT Provision should be made to prevent filter cake being carried out of the Y requirements for storage area on vehicle wheels and dust generation from the storage and sludge treatment loading areas. Analysis of the sludge/filter cake should be undertaken to ensure that the treatment process objectives are being met and the process is working effectively.

Table 2 – BAT consideration using Best Available Techniques (BAT) Reference Document for Waste Treatment Final Draft (October 2017)

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BAT BAT Scope Design Requirements Y / N? Conclusion

Overall environmental performance 1 Management Systems Y 2 Waste Acceptance N – no third party waste is being Set up and implement waste characterisation and pre- accepted at the plant. Only a single acceptance procedures waste stream is accepted which is Set up and implement waste acceptance procedures generated from site activities. Set up and implement a waste tracking system and inventory Set up and implement an output quality management system Ensure waste segregation Ensure waste compatibility prior to mixing or blending of waste Sort incoming solid waste 3 To maintain an inventory of waste water and waste gas Y – waste water will need to considered. streams N – waste gas will not be generated and therefore not considered 4 Storage of waste N Optimised storage location Adequate storage capacity Safe storage operation Separate area for storage and handling of packaged hazardous waste 5 Implement handling and transfer procedures for waste Y Monitoring 6 Water emission monitoring Y 7 Emissions to water Y – requirement to segregate clean water from contaminated water and to prevent leaks and spills. This will influence drainage and also bunding 8 Air emissions monitoring N 9 Emissions of organic compounds to air monitoring N 10 Monitor odour emissions N 11 Monitor the annual consumption of water, energy and Y raw materials Emissions to air 12 Implement and regularly review an odour management N plan 13 Prevent or, where that is not practicable, to reduce N odour emissions 14 Prevent or, where that is not practicable, to reduce Y diffuse emissions to air, in particular of dust, organic compounds and odour Minimising the number of potential diffuse emissions sources Selection and use of high-integrity equipment Corrosion prevention Containment, collection and treatment of diffuse emissions Dampening

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Maintenance Cleaning of waste treatment and storage areas Leak detection and repair (LDAR) programme 15 Flaring N 16 Reduce emissions to air from flares N Noise and vibrations 17 Implement and regularly review a noise and vibration N – although the section 61 agreement management plan will be subject to periodic update 18 Reduce noise and vibration emissions N Emissions to water 19 Optimise water consumption, to reduce the volume of Y waste water generated and to prevent or, where that is not practicable, to reduce emissions to soil and water Water management Water recirculation Impermeable surface Techniques to reduce the likelihood and impact of overflows and failures from tanks and vessels Roofing of waste storage and treatment areas Segregation of water streams Adequate drainage infrastructure Design and maintenance provisions to allow detection and repair of leaks Buffer storage capacity 20 Reduce emissions to water Y Emissions from accidents and incidents 21 Prevent or limit the environmental consequences of Y accidents and incidents Material efficiency 22 Use materials efficiently N Energy efficiency 23 To use energy efficiently Y Energy efficiency plan Energy balance record Reuse of packaging 24 Maximise the reuse of packaging N General BAT conclusions for the mechanical treatment of waste 25 Reduce emissions to air of dust, and of particulate- N bound metals, PCDD/F and dioxin-like PCB 26 Improve the overall environmental performance, and to N prevent emissions due to accidents and incidents 27 To prevent deflagrations and to reduce emissions when N deflagrations occur 28 Use energy efficiently, BAT is to keep the shredder feed N stable BAT conclusions for the treatment of WEEE containing VFCs and/or VHCs 29 Reduce emissions of organic compounds to air, N 30 Prevent emissions due to explosions when treating WEEE N containing VFCs and/or VHCs BAT conclusions for the mechanical treatment of waste with calorific value 31 Reduce emissions to air of organic compounds N BAT conclusions for the mechanical treatment of WEEE containing mercury 32 Reduce mercury emissions to air N

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General BAT conclusions for the biological treatment of waste 33 Reduce odour emissions and to improve the overall N environmental performance, 34 Reduce channelled emissions to air of dust, organic N compounds and odorous compounds 35 Reduce the generation of waste water and to reduce N water usage BAT conclusions for the aerobic treatment of waste 36 Reduce emissions to air and to improve the overall N environmental performance 37 Reduce diffuse emissions to air of dust, odour and N bioaerosols from open-air treatment steps BAT conclusions for the anaerobic treatment of waste 38 Reduce emissions to air and to improve the overall environmental performance BAT conclusions for the mechanical biological treatment (MBT) of waste 39 Reduce emissions to air N BAT conclusions for the physico-chemical treatment of solid and/or pasty waste 40 Improve the overall environmental performance, BAT is N to monitor the waste input as part of the waste pre- acceptance and acceptance procedures 41 Reduce emissions of dust, organic compounds and NH3 N to air BAT conclusions for the re-refining of waste oil 42 Improve the overall environmental performance, BAT is N to monitor the waste input as part of the waste pre- acceptance and acceptance procedures 43 Reduce the quantity of waste sent for disposal N 44 Reduce emissions of organic compounds to air N BAT conclusions for the physico-chemical treatment of waste with calorific value 45 Reduce emissions of organic compounds to air N BAT conclusions for the regeneration of spent solvents 46 Improve the overall environmental performance of the N regeneration of spent solvents 47 Reduce emissions of organic compounds to air N BAT conclusions for the thermal treatment of spent activated carbon, waste catalysts and excavated contaminated soil 48 Improve the overall environmental performance of the N thermal treatment of spent activated carbon, waste catalysts and excavated contaminated soil 49 Reduce emissions of HCl, HF, dust and organic N compounds to air BAT conclusions for the water washing of excavated contaminated soil 50 Reduce emissions of dust and organic compounds to air N from the storage, handling, and washing steps BAT conclusions for the decontamination of equipment containing PCBs 51 Improve the overall environmental performance and to N reduce channelled emissions of PCBs and organic compounds BAT conclusions for the treatment of water-based liquid waste 52 Improve the overall environmental performance, BAT is N to monitor the waste input as part of the waste pre- acceptance and acceptance procedures

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53 Reduce emissions of HCl, NH3 and organic compounds N to air

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Appendix E – CL:AIRE DoW CoP

E.1 Use of CL:AIRE at the Southern Portal

E.1.1 As stated in the Environmental Statement which is a requirement of the Hybrid Bill a Definition of Waste Code of Practice (DoW CoP) Materials Management Plan (MMP) will be prepared, this will enable suitable material to be used as a resource within the construction of the Proposed Scheme with the additional benefit of reducing the quantity of imported fill required. E.1.2 The CL:AIRE DoW CoP provides a regulator approved framework to determine on a site by site basis whether excavated materials are classified as waste or not and determine when treated excavated waste can cease to be waste for a particular use. The DoW CoP guidance states that if materials are dealt with in accordance with the DoW CoP the Environment Agency considers that those materials are unlikely to be waste if they are used for the purpose of land development. Land development includes redevelopment, remediation and regrading. E.1.3 Implementation of the DoW CoP will ensure that material that does not require treatment is used as a non-waste without any permitting requirements therefore this route should be followed where appropriate and possible. Where material requires treatment (usually under an environmental permit) to render it suitable for reuse, the DoW CoP allows for treated material to be reused under a MMP once treatment has been successful. E.1.4 The DoW CoP sets out a number of factors for determining whether the material is not a waste and can therefore be reused. (i) Protection of human health and environment - use of the material will not create an unacceptable risk of pollution of the environment or harm to human health; (ii) Suitability – material must be suitable for its intended use in all respects (chemical and geotechnical properties), must meet specification for end-use; (iii) Certainty - must be able to demonstrate that the material will actually be used, not just a probability; and (iv) Quantity – only use quantity of material required for use; use of excessive amounts will indicate that it is being disposed of and is waste. E.1.5 As part of the DoW CoP an MMP needs to be produced and a signed declaration made by a Qualified Person to demonstrate that these factors have been considered and that a correct determination has been made in relation to the nature of materials. E.1.6 Material which is surplus to requirements and/or remains unsuitable for use (e.g. poses an unacceptable risk to human health/environment and/or is geotechnically unsuitable) following treatment would be considered as waste and therefore be subject to waste legislation requirements.

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E.1.7 HS2 Excavated Materials Management Strategy (HS2-HS2-CL-REP-000-000001 P02) establishes the principle that, wherever practicable, excavated materials generated by the HS2 construction works should be reused wherever practicable. In support of this principle, the HS2 Materials Management Plan Framework (HS2-HS2-EV-STD-000- 000006 P04) sets out the framework for the use of suitable excavated materials as a non- waste via the adoption of the DoW CoP. This framework includes a requirement to prepare MMPs for all construction works comprising the reuse of excavated material. E.1.8 The proposal is to use DoW CoP to manage excavated materials including Tunnel Boring Machine (TBM) arisings from Chiltern Tunnel in Section C1. For the purposes of the DoW CoP, Section C1 will be considered as one site and material reuse will take place under the ‘reuse on the site of origin scenario’. E.1.9 Due to the scale and complexity of construction works in Section C1, it is proposed that a number of MMPs would be produced. An Overarching MMP has been developed and provides a mechanism for managing the various MMPs by providing oversight across Section C1 so that materials can be reused efficiently, including between MMPs if required. Figure E.1 illustrates the materials management approach within Section C1. E.1.10 Material produced by the TBM constructing the Chiltern Tunnel will be processed to make it suitable for reuse, as following boring the chalk will be in slurry form. Processing of the material will be undertaken under the Environmental Permit. Once the material has been treated, it will be suitable for reuse in landscaping areas. The material that is anticipated to be suitable for reuse includes stones/sand fraction from the desanding treatment and cake from the treatment of the chalk slurry. It is anticipated that a number of MMPs will be produced to cover the placement of this material as works will extend over a number of years. At present, it is assumed that the treated material from the slurry treatment plant process will be reused on site in landscaping. E.1.11 The material being generated from the TBM and being used in landscaping will not create an unacceptable risk of pollution of the environment or harm to human health and will be suitable for use. The material will be of a suitable specification, subject to testing and routine checking. The material will be used in the agreed landscaping proposals. The project requires the route to tunnel through the Chilterns therefore a given amount of material will be generated that would be placed.

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Appendix F – Site Condition Report

F.1 Site Condition Report

1.0 SITE DETAILS

Name of the applicant Align

Activity address Chiltern Tunnel Southern Portal Slurry Treatment Plant, Chalfont Lane, Maple Cross, Hertfordshire WD3 9XN

National grid reference TQ 02652 91119

Document reference Chiltern Tunnel Southern Portal Slurry Treatment Plant Site Condition Report and dates for Site (v1 Application Stage) Condition Report at permit application and surrender

Document references See Figures 1 and 2 of permit application supporting information for site plans (including location and boundaries)

Note: In Part A of the application form you must give us details of the site’s location and provide us with a site plan. We need a detailed site plan (or plans) showing:

• Site location, the area covered by the site condition report, and the location and nature of the activities and/or waste facilities on the site; • Locations of receptors, sources of emissions/releases, and monitoring points; • Site drainage; and • Site surfacing. If this information is not shown on the site plan required by Part A of the application form, then you should submit the additional plan or plans with this site condition report.

2.0 Condition of the land at permit issue

Environmental setting The STP is located at the southern portal of the Chiltern Tunnel of HS2. As including: part of the works for the tunnel, the existing ground level of the location will • geology be reduced to give the correct track level. This will involve the removal of the • hydrogeology

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• surface waters current topsoil and subsoil, as well as the underlying geology down to approximately 5m bgl for the construction of the slab for the STP.

The bedrock geology for the area is Seaford Chalk and Newhaven Chalk Formations (the data do not differentiate between the two), formed during the Lower Cretaceous, which is the predominant bedrock type in the area.

Seaford Chalk, both weathered and competent (as identified above in the superficial geology section), with closely spaced fractures, was the predominant bedrock unit encountered beneath the site. Undifferentiated Seaford and Newhaven Chalk was generally only encountered around the South Portal cutting.

The Seaford Chalk and Newhaven Chalk bedrock Formations are designated as Principal Aquifers. The wider site is within a Source Protection Zone 1 and 2, although the STP itself sits within SPZ2. The SPZ’s are in relation to public supply boreholes operated by Affinity Water. There are no surface water bodies located on the site.

The site is not located within 10km of a European Site (candidate or Special Area of Conservation, proposed or Special Protection Area or Ramsar site). The site is not located within 1km of a SSSI (Specific Site of Scientific Interest). Pollution history A review of the available historical maps from 1872 for the site suggests that including: the site has been used as agricultural land to date. Zetica Ltd undertook a UXO desk study and risk assessment for the Limit of • pollution incidents Land to be Acquired for the entire Phase One route of HS2. This indicated that may have that there is a low risk of UXO at the site. A low risk is defined as “tolerable to affected land the client as engineering activity need not alter if UXO related”. • historical land-uses As part of the HS2 development, exploratory works have been undertaken and associated both within the STP permit boundary and within the wider southern portal contaminants area. These have been reported in 1MC05 Geoenvironmental Report: • any visual/olfactory Western Valley Slopes (MC05-ALJ-EV-REP-CS01-200147), which provides evidence of evidence that natural soils were encountered in exploratory holes located in existing close proximity to the site and that due to the depth that the portal will be contamination located below the natural ground level, there was no geo-environmental • evidence of testing for them. The exploratory holes were also outside any receptors damage to (source area) identified. Please refer to the appendix which contains the log pollution results from the relevant exploratory holes. prevention Typical chalk data is provided in LABO 17016 - SAV 21100718 - HS2 – measures CHILTERN TUNNEL – Laboratory test results Slurry Treatment Plant 19/02/2018

There are no known pollution incidents at the site, as it was previously agricultural land. Evidence of historic LABO 17016 - SAV 21100718 - HS2 – CHILTERN TUNNEL – Laboratory test contamination, for results Slurry Treatment Plant 19/02/2018 example, historical site MSDS for polymer investigation, assessment, remediation and verification reports (where available)

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Baseline soil and groundwater reference data

Supporting information LABO 17016 - SAV 21100718 - HS2 – CHILTERN TUNNEL – Laboratory test results Slurry Treatment Plant 19/02/2018

3.0 Permitted activities

Permitted activities The application is for a bespoke waste Environmental Permit for the physico- chemical treatment of non-hazardous waste for the purposes of recovery. Activities will be located on impermeable hardstanding with sealed drainage. All potentially polluting substances will be contained in tanks provided with dedicated secondary containment The only waste to be treated is chalk slurry originating from the boring of the Chiltern Tunnel. The treatment process consists of a slurry treatment plant (STP) which treats the slurry to remove gross and then fine particulate matter, which is tested to confirm its suitability for recovery in the approved landscaping scheme under the CL:AIRE Definition of Waste Code of Practice (DoW CoP). Liquid recovered from the process is recovered by reducing the pH of the liquid and then utilised to produce fresh slurry which is returned to the Tunnel Boring Machine (TBM) for reuse in the boring process. Non-permitted activities Non-permitted activities being carried out close to the site includes: undertaken • Wider site works; • Operation of a construction site; • Concrete batching plant; and • Operation of the TBM.

The wider site is fully impermeable with a concrete surface which has a sealed surface water drainage system. This includes a number of oil interceptors and concrete silt interceptors to capture any oils or suspended solids within the surface water drainage system. This then discharges to a holding pond, where the water is tested for contamination prior to discharge via a lamellar separator into a nearby surface water course. Operational areas of the wider southern portal capture water within their areas for cleaning and reuse within the southern portal. Document references for: See Figures 1 and 3 of the permit application supporting documents.

• plan showing The environmental risk assessment is included within the permit application activity layout; and supporting documentation. • environmental risk assessment.

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Note: In Part B of the application form you must tell us about the activities that you will undertake at the site. You must also give us an environmental risk assessment. This risk assessment must be based on our guidance (Environmental Risk Assessment - EPR H1) or use an equivalent approach.

It is essential that you identify in your environmental risk assessment all the substances used and produced that could pollute the soil or groundwater if there were an accident, or if measures to protect land fail.

These include substances that would be classified as ‘dangerous’ under the Control of Major Accident Hazards (COMAH) regulations and also raw materials, fuels, intermediates, products, wastes and effluents.

If your submitted environmental risk assessment does not adequately address the risks to soil and groundwater we may need to request further information from you or even refuse your permit application.

This section to be completed during the life of the operations

4.0 Changes to the activity

Have there been any changes to the activity If yes, provide a plan showing the changes to the boundary? activity boundary.

Have there been any changes to the permitted If yes, provide a description of the changes to the activities? permitted activities

Have any ‘dangerous substances’ not If yes, list of them identified in the Application Site Condition Report been used or produced as a result of the permitted activities?

Checklist of • Plan showing any changes to the boundary (where relevant) supporting • Description of the changes to the permitted activities (where relevant) information • List of ‘dangerous substances’ used/produced by the permitted activities that were not identified in the Application Site Condition Report (where relevant)

5.0 Measures taken to protect land

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Use records that you collected during the life of the permit to summarise whether pollution prevention measures worked. If you can’t, you need to collect land and/or groundwater data to assess whether the land has deteriorated.

Checklist of • Inspection records and summary of findings of inspections for all pollution supporting prevention measures information • Records of maintenance, repair and replacement of pollution prevention measures

6.0 Pollution incidents that may have had an impact on land, and their remediation

Summarise any pollution incidents that may have damaged the land. Describe how you investigated and remedied each one. If you can’t, you need to collect land and /or groundwater reference data to assess whether the land has deteriorated while you’ve been there.

Checklist of • Records of pollution incidents that may have impacted on land supporting • Records of their investigation and remediation information

7.0 Soil gas and water quality monitoring (where undertaken)

Provide details of any soil gas and/or water monitoring you did. Include a summary of the findings. Say whether it shows that the land deteriorated as a result of the permitted activities. If it did, outline how you investigated and remedied this.

Checklist of • Description of soil gas and/or water monitoring undertaken supporting • Monitoring results (including graphs) information

This section to be completed during the surrender

8.0 Decommissioning and removal of pollution risk

Describe how the site was decommissioned. Demonstrate that all sources of pollution risk have been removed. Describe whether the decommissioning had any impact on the land. Outline how you investigated and remedied this.

Checklist of • Site closure plan supporting • List of potential sources of pollution risk information • Investigation and remediation reports (where relevant)

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9.0 Reference data and remediation (where relevant)

Say whether you had to collect land and/or groundwater data. Or say that you didn’t need to because the information from sections 3, 4, 5 and 6 of the Surrender Site Condition Report shows that the land has not deteriorated.

If you did collect land and/or groundwater reference data, summarise what this entailed, and what your data found. Say whether the data shows that the condition of the land has deteriorated, or whether the land at the site is in a “satisfactory state”. If it isn’t, summarise what you did to remedy this. Confirm that the land is now in a “satisfactory state” at surrender.

Checklist of • Land and/or groundwater data collected at application (if collected) supporting • Land and/or groundwater data collected at surrender (where needed) information • Assessment of satisfactory state • Remediation and verification reports (where undertaken)

10.0 Statement of site condition

Using the information from sections 3 to 7, give a statement about the condition of the land at the site. This should confirm that:

• the permitted activities have stopped • decommissioning is complete, and the pollution risk has been removed • the land is in a satisfactory condition.

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Appendix G – CoTC Evidence

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Office 4, Beccles Station, Station Road, Beccles, Suffolk NR34 9QJ 01502 712209 [email protected] www.hsecservices.co.uk

Ms Sophia Postoyko 4 Hurst Path Pitstone Leighton Buzzard LU7 9FS Date: 17/02/2020

Notification of Registration with WAMITAB and Health, Safety & Environmental Compliance Services Limited.

Dear Ms Sophia Postoyko,

We are pleased to confirm that you have been registered with Health, Safety & Environmental Compliance Services Ltd and the Awarding Organisation ‘’WAMITAB’’ for the below award / unit:

✓ WAMITAB Level 4 Certificate In waste and Resource Management – VRQ ✓ Optional Unit 1: VRQ406 - Principles and practices of managing a physical treatment processing facility

Please see below registration numbers and dates that you will be required to provide, when contacting either the Centre or the Awarding Organisation – WAMITAB.

✓ Centre Delegate Number: H00161S ✓ WAMITAB Number: 113342 ✓ WAMITAB Registration Date: 10/02/2020 ✓ Expiry Date: 10/02/2021 – (Please do no input the expiry date into your question papers)

You now have 12 months from the above mentioned WAMITAB registration date to achieve the award. Should reregistration be required after this period, all work supplied and marked will be carried over, however this is subject to our terms and conditions and an additional reregistration fee will be incurred.

Prior to making any submission to [email protected] please ensure the above information is inserted into the top of each unit question paper (Section 1. Delegate). Please also ensure that you read the declaration page for each unit question paper ‘’Declaration and Notes for Delegates’’ prior to signing section 2.

Please let us know if any information transmitted to you, such as address and most importantly names are incorrect as this is how your name will appear on any Certificate claimed. Additionally, if any personal information changes such as home address, place of work or names please contact [email protected] at your earliest opportunity, or alternatively complete ‘’HSEC0055 – Change of details’’ which can be sent via a postal service and can be found at the back of section 2 in your portfolio.

These details will remain on file for the duration of your chosen qualification and for a period as outlined in ‘’HSEC0023 - GDPR Policy’’.

Goodluck in the completion of your qualification, remember if you need anything or you have any queries don’t hesitate to contact us.

Yours sincerely

Ben Saville

Director / Centre Manager

Company Registration Number: 1123 7054 VAT Registration Number: 9467 63185

Health, Safety & Environmental Compliance Services Limited is registered in the UK - Company No. 11237054 Chiltern Tunnel South Portal – Slurry Treatment Plant Environmental Permit Application Supporting Information EAWML 404489 Document no: 1MC05-ALJ-EV-APP-CS02_CL03-000001 Revision: C01

Appendix H– Proposed Polymer MSDS

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