Construction Method Statement of LP Gas Tanks Installation

Construction Method Statement – Planning Application Ref: 21/00410/DISC

Construction of 20 new build houses

at Land North Of Oak View, Northampton Road, Weston On The Green, Bicester, OX25 3RG

Construction Method Statement of LP Gas Tanks Installation

Version 2

On Behalf of

Hayden Homes Limited

May 2021

Hayden Homes Limited Construction Method Statement of LP Gas Tanks Installation – Planning Ref: 21/00410/DISC May 2021

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CONTENTS

1.0 Construction Method Statement of LP Gas Tanks Installation 2-5

2.0 Appendix A – Flo Gas Drawings, specification, and image of LP Gas tanks 6-12


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1.0 Construction Method Statement of LP Gas Tanks Installation

This Method Statement / Specification should be read and used in conjunction with Flogas Drawings Numbers STD/4x2/001, STD/4x2/002 and STD/4x2/003. The LPG storage and distribution system has been designed and will be installed within the guidance supplied by the following Codes of Practice and Technical Documents: - Liquid Gas UK CoP 1 part 4 Liquid Gas UK CoP 22 Liquid Gas UK CoP 25 IGEM TD3 & TD4 All work undertaken on this project should follow Health and Safety requirements. In particular, for the excavation the Health and Safety at Work Act, Building Standards ie BS:6031:2009 - Code of Practice for Earthworks. Reference should also be made to the requirements of the Construction (General Provision) Regulations 1961, Part IV (Statutory Instrument SI 1580) Flogas reserves the right for its employees and contractors to refuse to enter any excavation that they consider does not comply with the requirements of the above codes and standards. Where this right is exercised, Flogas will not be liable for any costs incurred by others. Flogas also reserves the right to charge any costs that it incurs following a delay caused by the above non-compliance. All references to Flogas also include Contractors approved by and contracted to Flogas.


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Excavation The pit for the installation of the tanks should be excavated to a depth of 1.300 m, over an area of 6.400 m x 9.800 m, with two over-digs for the tank anchor slabs. The bottom of the excavation should be reasonably level. Most ground conditions will require some degree of support to the excavation sides to avoid collapse, in most cases this will be achieved by battering the sides back, at an angle, to suit the local ground conditions. Any batter should be made without reducing the size of the bottom area of the excavation. Tank Anchor Slabs The 2 Tank Anchor Slabs should be cast in the bottom of the excavation (as shown on Drawings Nos. STD/4x2/002 and STD/4x2/003). The Slabs should be cast from concrete with a minimum strength of 21 Newton’s. The Tank Securing Eyes, supplied free issue by Flogas, should be set into the concrete slabs at the positions shown on Drawing No. STD/4x2/003. Tank Installation The Tanks will be lifted from the delivery vehicle, using a lorry mounted crane (crane operator CITB certified), onto the tank Anchor Slabs and strapped down to the slabs by Flogas. Anode Installation The Corrosion Protection System Anodes will be installed by Flogas. The anodes are in small sacks which are placed at the edges of the excavation, these will then be connected by ultralow voltage cables to the CP System test post. Backfilling Operations All backfilling operations must be undertaken in the areas of the tanks with a member of Flogas technical staff present. The Anodes should be covered with a layer of excavated soil. The Tanks should be backfilled, within 500 mm of the tank shells, with pea shingle (max dia 10.0 mm). The excavated soil can be used outside of the 500 mm area around the tank shells. Backfilling should continue until the tanks are covered by approximately 100 mm (this will start to form the mound over the tanks), at this point it should stop to await the installation of the tank interconnecting pipework.


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Pressure Reduction Unit and Cathodic Protection System Installation Flogas will:-

a) Install the Pressure Reduction Unit and the Tank Interconnection Pipework up to the Pressure Reduction Unit. b) Install the Cathodic Protection System Monitoring Units and connect the Anode and Cathode cables to the test post.

Backfilling Continued Following completion of tank interconnecting pipework all backfilling should be completed up to 75 mm below the finished ground level for the storage area. The grading down to the surrounding ground level should not start over the actual tanks. This operation should be under the supervision of Flogas. Warning Vehicles and machines should not be permitted to drive over or onto the tank area. Gas Main Installation A 700 mm deep (from finished compound or ground level) trench (300 mm min width) should be excavated for the gas main (the bottom of the trench should be blinded with sharp sand). The gas main will then be installed by Flogas. Following installation of the gas main, the trench within the storage area, should be backfilled with the same medium that has been used around the tanks. Storage Area Surface The complete area over the tanks (the area of the bottom of the excavation) should be covered by a permeable membrane and then be surfaced with 75 mm of 19/20 mm Shingle. A minimum cover depth of 300 mm must be maintained over the tanks. Tank Area Protection/Demarcation The chosen method of protecting/demarcating the tank area should now be completed so that the tank commissioning process can proceed.


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Resident Notices

Although there are not expected to be any further significant deliveries as the LP Gas tanks have already been delivered; Local residents will be kept informed of significant deliveries and liaised with through the project. The company of contact for any enquiries regarding this will be Ibis Limited, of which the contact details can be found below.

Road Closures

No road closures will be required during construction. However, the site manager will be on hand to oversee the process, as well as the FloGas team.

Banksman

A banksman is available to coordinate traffic safely entering and leaving the site onto the B430.

Parking

The site manager will ensure there will be no unrelated site vehicles within the perimeter of the construction area, during the time of installation.

Site signage and barriers

The site manager will ensure the appropriate site signage and barriers are implemented across the workspace during the installation. This is monitored daily on site by the site manager and management team.

Construction traffic and deliveries

It is to be noted that the LP Gas tanks have been delivered to site and are currently being safely stored in the storage compound area as seen in Appendix A.2. Should there be any other deliveries relating to the installation of the tanks, this will be co-ordinated with the site manager and the banksman. There is a one-way traffic management system in place and any other deliveries will be outside network peak and school peak hours.

Contact Details of Senior Site Manager

The senior site manager on the site is Phil Henderson, Ibis Limited, 07827 317591.


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2.0 Appendix A - Flo Gas Schedule Sheet

A.1 Flo Gas drawing schedule as scheduled overleaf.

A.2 Image of LP Gas tanks on site as scheduled overleaf.


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Construction Method Statement of LP Gas Tanks Installation

Documents

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