Court of appeal Judgement Approves ‘‘Piggybacking’’

On 20th December 2007, the court of Appeal in the case of E.A.v Antiwaste Ltd EWEA CW 1377, overturned the EA’s decision to refuse to consider permit applications for Landfills that piggyback onto existing closed landfill cells.

Antiwaste made the application for two Landfill...  read more

Court of appeal Judgement Approves ‘‘Piggybacking’’

On 20th December 2007, the court of Appeal in the case of E.A.v Antiwaste Ltd EWEA CW 1377, overturned the EA’s decision to refuse to consider permit applications for Landfills that piggyback onto existing closed landfill cells.

Antiwaste made the application for two Landfills in Norfolk, the EA rejected the application. Before appealing the two parties agreed to go to the High Court to resolve the interpretation of the legislation.

1. Can a PPC permit be granted for a ‘Piggyback’?

2. Where the permit must be issued for the new cell and closed cell together, must a permit be refused where the closed cell is responsible for discharges of harmful substances into the groundwater and the two cells together cannot be made to comply with regulatory requirements.

The high court held that ‘Piggybacking’ cells can be lawfully granted permits, but not where a discharge would continue from the old cell as that would amount to permitting the existing discharged. Both parties appealed.

Appeal Decision.

The court of Appeal upheld the decision of the high Court that a permit can be lawfully granted to a piggyback cell. It was held that both the closed cell and the new cell are technical units separately carrying out appropriate activities.

As regards the groundwater issue, the Court of Appeal quashed the High Court’s decision suggesting that discharges from closed cells were not directly or indirectly related to the new cell and should not be considered in the application.

Although this is not necessarily a go ahead for all ‘Piggybacking’ applications it is now possible in principle with the right design.

NAUE can offer a full design service for the ‘Piggybacking’ of landfills. The biggest issues is designing the liner system over old waste so that the HDPE liner is not compromised. This can be done with the correct design utilising NAUE’s geogrid Secugrid® available in strengths from 20kN/m to 40kN/m. along with NAUE’s GCL Bentofix®, HDPE, Carbofol®, geotextiles Secutex® and our geodrain Secudrain®, NAUE can design and supply the full liner system to satisfy the technical requirements of ‘Piggybacking’, landfills. For more information on ‘Piggybacking’ and the services NAUE can supply please contact Chris Quirk (cquirk@naue.co.uk) or Angus Hamilton (ahamilton@naue.co.uk).
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RECOMMENDATIONS FOR LEACHATE DRAINAGE BLANKET LAYERS



On the 23 April 2007 the EA completed a guidance document relating to Leachate drainage Aggregate. This document meets the requirements of the Landfill Regulations 2002.

In summary, the attached document details drainage layer aggregate thickness, grading and pipe...  read more

RECOMMENDATIONS FOR LEACHATE DRAINAGE BLANKET LAYERS



On the 23 April 2007 the EA completed a guidance document relating to Leachate drainage Aggregate. This document meets the requirements of the Landfill Regulations 2002.

In summary, the attached document details drainage layer aggregate thickness, grading and pipe network requirements within the basal layer of new landfill cell constructions.

It has been a requirement of the Landfill Regulations that basal aggregate drainage blankets should be a minimum of 500 mm in thickness, graded at a 20 / 40 mm aggregate.

This new guidance allows for a 300 mm thickness of a drainage blanket, where a 10 / 20 mm graded aggregate is used, subject to the following requirements:

• The drainage blanket must include a robust, well engineered slotted / perforated pipe network (in accordance with the attached guidance).

• The installation of a Filter Geotextile to be placed on top of the 10 / 20 mm graded drainage aggregate (point 3, first page of attached guidance).

With the acceptance by the EA of allowing a finer grade aggregate, at a reduced thickness, comes potential cost saving opportunities in that a lighter weight protection geotextile can also be put forward for installation below the aggregate, subject to cylinder test approval.

With the acceptance of a 300 mm drainage blanket, subject to the conditions above, also benefits Landfill Operators, as it allows for an extra 200 mm of void space across the base of the landfill cell.

Naue Geosynthetics are able to offer our Secutex 301 GRK 5 (which FULLY complies with the filter geotextile EA Specification, to be placed on top of the drainage aggregate.

These new developments allow greater flexibility within the design of the drainage blanket, allowing for a more cost effective approach.

We would be happy to discuss any of the above details further by phone or meet with yourselves should you require any further assistance. Please do not hesitate to contact Angus Hamilton or Jake Stoyle regarding this new guidance.

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RECOMMENDATIONS FOR THE USE OF TYRES FOR LEACHATE DRAINAGE BLANKET LAYERS

Please find details below regarding new Environment Agency (EA) Guidance for the use of used whole and shredded tyres as an engineering material replacement for drainage aggregate within the drainage blanket.

The generic term for such materials is “Used Tyre Derived Aggre...  read more

RECOMMENDATIONS FOR THE USE OF TYRES FOR LEACHATE DRAINAGE BLANKET LAYERS

Please find details below regarding new Environment Agency (EA) Guidance for the use of used whole and shredded tyres as an engineering material replacement for drainage aggregate within the drainage blanket.

The generic term for such materials is “Used Tyre Derived Aggregate Replacements” or UTDAR.

On the 20 June 2007 the EA completed the attached guidance document relating to Leachate drainage Blankets. This document will be followed by further guidance, upon EA review, in the future. However, the current guidance attached is designed to provide regulatory consistency in terms of design and construction.

In summary, the attached document details the following issues regarding UTDAR drainage blanket usage:

• The initial landfill assessment and hydrological / gas risk assessment requirements for the use of UTDAR systems.

• Potential alterations to the basal and side slope engineering designs to incorporate UTDAR systems.

• Tyre compressibility tables for whole baled and shredded tyre to achieve 500 mm equivalence thickness under load.

• Hydraulic Conductivity calculations and drainage installation requirements for non tyre elements regarding drainage pipe networks and a side slope drainage system.

As part of the attached guidance for UTDAR systems, for Shredded tyre applications, it is recommended that the drainage blanket is overlain with a filter geotextile (see table presented on page 5 of attached guidance).

Naue Geosynthetics are able to offer our Secutex 301 GRK 5 (Data sheet attached) which FULLY complies with the filter geotextile EA Specification, to be placed on top of the drainage blanket.

Another part of the attached guidance for UTDAR systems, for Whole tyre applications, it is recommended that the drainage blanket is overlain with a geogrid to resist uplift forces during the period of greatest waste settlement, to prevent upward migration of tyres.

Naue Geosynthetics have extensive experience regarding the use of geogrids for the above application, specifically in the UK with our Secugrid 30/30 Q1 (Data Sheet attached) being used at a hazardous Landfill site in the West Midlands as a test site for the guidance.

We would be happy to discuss any of the above details by phone or meet with yourselves should you require any further assistance. Please do not hesitate to contact Angus Hamilton or Jake Stoyle regarding this new guidance.
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Chris Quirk Managing Director Tel. +44 1925-810280 Fax +44 1925-810284 Mobile +44 77104-20362 E-mail: cquirk@naue.co.uk Fiona Bonner Office Manager Tel. +44 1925-810280 Fax +44 1925-810284 E-mail: fbonner@naue.co.uk Andy Cracknell UK & Ireland Sales Director Tel. +44 1977-625338 Fax +44 1925-810284 Mobile +44 79214-64485 E-mail: acracknell@naue.co.uk Angus Hamilton UK & Ireland Sales Manager Landfill and Environmental Tel. +44 1925-810280 Fax +44 1925-810284 Mobile +44 77115-28965 E-mail: ahamilton@naue.co.uk Ian Page Sales Engineer (Infrastructure - Southern Area) Tel. +44 1759-344 775 Fax +44 1925-810284 Mobile +44 78094-28206 E-mail: ipage@naue.co.uk Jake Stoyle Environmental Sales Manager / Technical Consultant Tel. +44 1925-810280 Fax +44 1925-810284 Mobile +44 7710-823599 E-mail: jstoyle@naue.co.uk