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APPENDIX A Earthworks and Roads Drawings

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At-up Consulting Engineers -

APPENDIX 6 AMEC Civils Design Philosophy Document L3882-030-0389

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ame &RR% -- natural gas

Corrib Project L3882 I Shell E+P Contract No. 101.24.15

CORRIB FIELD DEVELOPMENT: BELLANABOY BRIDGE GAS TERMINAL

DOCUMENT TITLE:

DOCUMENT NUMBER:

SHEET NO.:

ClVlLS DESIGN PHILOSOPHY DOCUMENT

L3882-030-l ‘l O-0389

1 of12

PI NOV ‘03 FOR PLANNING APPLICATION DSR MC SC REV DATE DESCRIPTION BY CHK APP REVISIONS APPROVALS This document is confidential and is the exclusive property of AMEC. No unauthorized use, copy or disclosure of the document is to be made. It is to be returned whenever required. Manufacture and construction are to be carried out strictly in accordance with the requirements of this document. No changes are to be made without the prior agreement of the Project Manager.

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CORRIB FIELD DEVELOPMENT : BELLANABOY BRIDGE GAS TERMINAL

0 TITLE CIVILS DESIGN PHILOSOPHY REV DATE PAGE NO. DOCUMENT No. L3882-030-I 1 O-0389 PI NOV’03 2of 12

1. 2. 3.

4. 5.

6.

7. 8.

9.

CONTENTS

INTRODUCTION.. .............................................................................................................. 3 PREAMBLE.. ...................................................................................................................... 3 EARTHWORKS AND GROUND PREPARATION.. .......................................................... .3 3.1 FLARE AREA RETAINING WALL.. ............................................................................ .3 3.2 FLARE STERILE AREA RADIATION PROTECTION.. ............................................. .3 3.3 ADMINISTRATION BUILDING AND CAR PARK PLATFORM.. ................................ .3 TERMINAL GEOTECHNICAL CONDITIONS.. ................................................................. .4 FOUNDATION DESIGN.. .................................................................................................. .4 5.1 STRUCTURES FOUNDED ON INTACT ROCK, NON INTACT ROCK AND MINERAL SOILS.. ....................................................................................... .:. ................... .4 5.2 STRUCTURES. FOUNDED ON NON-ENGINEERING FILL MATERIAL AND MINERAL SOILS.. ............................................................................................................. .4 5.3 STRUCTURES FOUNDED ON NON-ENGINEERING FILL MATERIAL.. ................. .5 5.4 STRUCTURES IN PEAT AREAS.. ............................................................................. .5 PILING REVIEW ................................................................................................................ 6 6.1 OVERVIEW AND RECOMMENDATION ................................................................... .6 6.2 ODEX PILING SYSTEM -SUMMARY.. ...................................................................... .6 6.3 FLARE STACK AND GUY CABLES. ......................................................................... .6 6.4 CONTROL BUILDING. ................................................................................................ 7 6.5 PILING CONSTRUCTION ISSUES ........................................................................... .7 SITE DRAINAGE.. .............................................................................................................. 7 ACCESS ROADS.. ............................................................................................................. 7 8.1 FLARE AREA ............................................................................................................. .8 8.2 TERMINAL ACCESS ROAD ...................................................................................... .8 APPENDIX A GEOTECHNICAL CONDITIONS OF TERMINAL.. .................................... .9

10. APPENDIX B ROTARY PILE INSTALLATION.. .............................................................. 11 11. APPENDIX C AREA DESIGNATIONS ............................................................................ 12

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CORRIB FIELD DEVELOPMENT : BELLANABOY BRIDGE GAS TERMINAL

a TITLE CIVILS DESIGN PHILOSOPHY REV DATE PAGE NO. DOCUMENT No. L3882-030-11 O-0389 PI NOV’03 3of12

1. INTRODUCTION

Shell E+P Ireland Limited (SEIPL) are submitting a new Planning Application for the Corrib Natural Gas Terminal at Bellanaboy Bridge.

2. PREAMBLE

AMEC (Oil and Gas) has assessed the civil and structural design within the terminal security fence area. The purpose of this document is to set out the civil design philosophy.

Arup Consulting Engineers have carried out the engineering and design of the site preparation and earthworks which includes all enabling works, peat removal, cut and fill operations and all works required to establish a stable and level platform for the Corrib Terminal at a level of 33.4m AOD Malin, including the composite drawing for the earthworks for the site and surrounding area, and the perimeter drainage of the terminal platform and the surrounding area. AMEC have prepared the drainage design for the terminal site.

3. EARTHWORKS AND GROUND PREPARATION

In order to minimise the removal of peat from the terminal site the flare area has been retained as natural ground. The administration buildings are also founded at an elevation corresponding to the natural ground level.

Arup investigated the ground preparation approach for the in situ peat (in the flare area, administration building area and car park) as part of the earthworks for the terminal site. This is summarised below, but is detailed fully in Arup’s documentation.

3.1 FLARE AREA RETAINING WALL

The natural ground forming the flare area is higher than the adjacent terminal ground level. A retaining wall will be required for the transition from the natural ground level to the terminal level, and will be constructed from gabions. Construction details and sections through the gabion wall are shown on drawing COR-AP-RP-001 IOO2.

3.2 FLARE STERILE AREA RADIATION PROTECTION

The peat surface forming the flare terrace will be protected from flare heat radiation by incorporating a geotextile and IOOmm of graded engineering fill with a 25mm top layer of reflective stone.

3.3 ADMINISTRATION BUILDING AND CAR PARK PLATFORM.

For the ground around the administration, warehouse building and car park, a platform will be constructed. The in situ peat is stable and will be modified to increase its strength. This will require soil stabilisation of the in situ peat,

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CORRIB FIELD DEVELOPMENT : BELLANABOY BRIDGE GAS TERMINAL

0 TITLE CIVILS DESIGN PHILOSOPHY REV DATE PAGE NO. DOCUMENT No. L3882-030-I 1 O-0389 PI NOV’03 4of12

and the construction of a cast reinforced concrete slab supported on Odex piles. This will enable the construction of the buildings, roads and car parks and provide a permanent area around the buildings, which will not be subject to settlement. This is detailed on drawing numbers COR-AP-RP-001 to 002.

4. TERMINAL GEOTECHNICAL CONDITIONS

The cut and fill balance and the final geotechnical conditions across the terminal site were investigated by Arup, and are summarised in Appendix A.

The ground conditions fall into 5 categories: -

1. Intact rock. 2. Non Intact rock (weathered rock) 3. Mineral soil 4. Non engineering fill 5. Peat

The foundation requirements for each of these categories is detailed in section 5.0

5. FOUNDATION DESIGN

The foundation type for each of the structures is dependent upon the ground conditions, as described in section 4.0 above, and appendix A.

5.1 STRUCTURES FOUNDED ON INTACT ROCK, NON INTACT ROCK AND MINERAL SOILS.

The foundation design for structures founded on the intact rock, non-intact rock and mineral soils will be “pad and pier” ground bearing foundations. All of the structures in the process area (area 4) will be of pad and pier construction.

5.2 STRUCTURES. FOUNDED ON NON-ENGINEERING FILL MATERIAL AND MINERAL SOILS

Where structures are founded partially on the non-engineering fill the structure will be piled. Alternatively and where suitable, the ground level will be raised to the same formation level as the firm mineral soils using lean mix concrete and “pad and pier” foundations as in 5.1 above will be used.

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5.3 STRUCTURES FOUNDED ON NON-ENGINEERING FILL MATERIAL.

Structures founded on non-engineering fill will be piled, refer to appendix A for the extent of non-engineering fill. The structures affected are summarised below, refer to appendix C for area designations.

Area 1 Pig launcher. Area 1 Pig receiver and piping anchor block. Area 1 Major pipe supports to pig launcher. Area 1 Slug catcher Area 2 Product methanol storage tanks and bund. Area 2 Raw methanol storage tanks and bund. Area 3 Open drain sump Area 6 Firewater pump house building. Area 6 Firewater pumps and pipe support frame Area 6 Pipe rack between firewater pump house and firewater pond. Area 6 Major pipe supports Area 7 Power generation building Area 7 Power generators Area 7 Major equipment Area 7 Major pipe supports Area 7 Telecommunications mast. Area 7 Control building. Area 8 Maintenance Flare Area 8 Flare pipe rack Area 9 Export pipe rack. Area 9 Sleeper ways adjacent to storage tanks and flare

5.4 STRUCTURES IN PEAT AREAS

Foundations which are supporting structures and buildings located on peat cannot be ground bearing due to the very low bearing and shear capacity of the peat and these will be piled, refer to appendix A for the extent of the peat area.

The structures affected are summarised below.

- Area 8 Flare stack and Guy cables - Area 8 Flare pipe rack supporting the flare piping and utilities on the flare

plateau. - Area 8 Reinforced concrete sleepers supporting the firewater ring main

on the flare plateau. - Area IO Administration buildings and car park. - Area IO Weighbridge. - Access road to terminal.

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CORRIB FIELD DEVELOPMENT : BELLANABOY BRIDGE GAS TERMINAL

0 TITLE CIVILS DESIGN PHILOSOPHY REV DATE PAGE NO. DOCUMENT No. L3882-030-I 1 O-0389 PI NOV’03 6ofl2

6. PILING REVIEW

6.1 OVERVIEW AND RECOMMENDATION

AMEC has reviewed the layout and the potential pi1in.g options for the foundations that will now be constructed on the peat and non-engineering fill. The Odex piling system is recommended for piling in peat and non- engineering fill for the following reasons:-

- Minimal vibration during pile installation. - Mini piling rig which is more suitable for operating on peat. - Steel sleeve retains wet concrete during curing. - Pile installation method allows pile to be installed into the rock, providing

a higher level of confidence in pile stability.

6.2 ODEX PILING SYSTEM -SUMMARY

Odex piles are installed using a mini piling rig, which has an operating weight of 1525t, and is suitable for operating on soft soils. The drill bit supports the pile sleeve, which is installed in 2m sections, subsequent sleeves are connected to the previous sleeve as piling operation progresses. A rotary pile installation diagram is shown in Appendix B.

As the peat may not provide sufficient lateral support to maintain the integrity of the pile whilst the concrete is wet, the pile sleeve is retained. The sleeve also protects the wet concrete from the acidic peat.

As this is an augured piling system the pile can be installed in a rock socket, providing better stability at the toe of the pile.

This piling system will have minimal vibrations and is suitable for operating on soft soils such as the peat and non-engineering fill.

6.3 FLARE STACK AND GUY CABLES.

The flare stack foundation will be piled. The guy cables will be restrained with reinforced concrete anchor blocks and a combination of ground anchors and piles. The rock anchors drilled and grouted into the bedrock will resist the tension from the guy cables.

The ground anchors used to hold the guy ropes from’the flare stack will be approximately 150mm diameter and will extend approximately 5m into the good quality rock. There is sufficient borehole information to assess the depth of anchor, however confirmatory drilling as part of the anchor installation is recommended to confirm the depth of sound rock in the particular areas required.

The anchors will require corrosion protection to the current standards, i.e. double encapsulation. A mobile grout batching plant will be used on site to

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0 TITLE CIVILS DESIGN PHILOSOPHY REV DATE PAGE NO. DOCUMENT No. L3882-030-11 O-0389 PI NOW03 7of12

produce the grout required to fill the bores. Samples of the grout will be taken for testing to prove the grout quality.

6.4 CONTROL BUILDING.

The complete control building is to be blast resistant, with a design overpressure of 0.2bar. The building structure will be of reinforced concrete construction.

Special consideration will be required for the foundation design, as the control building is founded on non-engineering fill and therefore piling will be required. The piling design will have to take into account the horizontal shears and overturning moment resulting from the applied blast over pressure. Rock anchors will be used to provide the lateral constraint required for the blast overpressure design case.

6.5 PILING CONSTRUCTION ISSUES

A platform will be required to support the piling machines and equipment. The design of the piling mat will be undertaken once the final details of the piling equipment are known. As the Odex piling rig is suitable for soft ground conditions the thickness of the piling platform will not be more onerous than the requirements for the temporary haul roads or the platforms for cranes normally used during construction.

SITE DRAINAGE

The overall terminal rainwater discharge to the settlement ponds has been assessed by Arup as part of the overall rainwater / settlement pond calculations.

The drainage philosophy for areas within the terminal boundary is described in document number L3882-030-I 1 O-0390 and detailed on drawing COR- AM-TD-001. For the perimeter surface water and ground water drainage layout refer to drawing number COR-AR-SD-001.

ACCESS ROADS

The construction of the terminal roads located on the intact rock, non-intact rock, mineral soils and non-engineering fill will consist of a sub base layer of imported, crushed and graded rock. This will be laid at depths between circa 150mm and 500mm, depending on the nature of the underlying materials and the bearing capacities achieved in the underlying cut / fill materials. The sub base materials will be overlain by a reinforced concrete pavement or flexible bituminous pavement depending on the local duty requirements of the paved / road area. The use of geo textiles in fill areas is envisaged.

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CORRIB FIELD DEVELOPMENT : BELLANABOY BRIDGE GAS TERMINAL

0 TITLE CIVILS DESIGN PHILOSOPHY REV DATE PAGE NO. DOCUMENT No. L3882-030-I I O-0389 PI NOV’03 8of 12

The roads located on the peat will require a different construction to allow for the settlement of the peat. The access roads affected are summarised below.

8.1 FLARE AREA

A construction road will be provided on the flare plateau for the installation of the flare pipe rack, flare guy cables, flare stack, and fire main sleepers. (E.g. piling rig and crane access for the rack and flare installation).

Road construction In the flare area will be similar to the terminal access road.

8.2 TERMINAL ACCESS ROAD

The main terminal access road will be constructed on modified peat, in accordance with the Arup construction details in the Arup “Earthworks Planning Report” document reference Cl 157.1 O-RP005.

The road includes a piped drain system and the design of the road will be developed to ensure that differential settlement of the road and drainage system cannot occur.

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CORRIB FIELD DEVELOPMENT : BELLANABOY BRIDGE GAS TERMINAL

0 TITLE DOCUMENT No. 1 1 CIVILS L3882-030-I DESIGN 1 O-0389 PHILOSOPHY 1 1 REV PI 1 1 NOV’03 DATE 1 1 PAGE 9of 12 NO.

9. APPENDIX A GEOTECHNICAL CONDITIONS OF TERMINAL

REFER TO ARUP DRAWINGS FOR SECTIONS THROUGH TERMINAL GROUND.

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