2 05, 2018

Habitat Mapping Article Published

The development of technology in recent years has revolutionized the methods by which habitat mapping is undertaken and generated. Egniol’s Senior Ecologist Alan Cowlishaw has recently produced an article for Inside Ecology discussing the timeline of ecology survey mapping techniques, including a focus on the future use of hyperspectral imaging.

Alan’s article can be found by clicking here.

Habitat Mapping

For more information on the ecological services which Egniol provide, including habitat mapping, contact our Bangor office on 01248 355996 or email alan.cowlishaw@egniol.com

24 04, 2018

Stabilizing and Repurposing Closed Landfill Sites

Management of closed landfill sites presents various long term environmental challenges. In particular, the waste stabilization process is specific to every landfill site, and the resultant risks to the surrounding environment associated with landfill gas and leachate require a tailored management approach.

Egniol has been advising a local authority in north Wales on aftercare management of a closed landfill site since 2014. The site comprises both engineered areas and older ‘dilute & disperse’ areas, and has a highly variable waste composition across the site.

The remit of Egniol’s support to the local authority is two fold, to ensure full compliance with the site’s environmental permit whilst ensuring an optimal stabilization of the waste mass; this is imperative for any future permit surrender. Egniol prepared a comprehensive Gas Management Review Plan which was agreed with Natural Resources Wales (NRW) and has been implemented with the local authority. The Plan contains a series of measures aimed to improve the gas production process, reduce fugitive emissions and downsizing of the existing landfill gas engine.

Further work included carrying out of a leachate audit for better understanding of conditions within the landfill cells. A leachate recirculation system was designed and an initial recirculation trial overseen. Further trials are to be carried out in the near future before the long term leachate management approach is finalized.

Egniol has also begun appraisal of the potential opportunities to transform the cost liabilities of the site management to a revenue-generating business. The site already benefits from the existing road access, available space, and spare grid capacity.

A number of potential energy technologies were assessed and presented to the local authority, each providing certain marked benefits in terms of revenue, cost reduction, energy security and environmental sustainability. These options are undergoing further technical and financial feasibility assessments as we continue to work closely with the local authority.

Penhesgyn Site

26 03, 2018

Site Closure and Restoration Works

Egniol has been providing engineering and environmental services in relation to landfill site closure works at a former tin and copper mine in the south west of England since 2007. The site has been undergoing progressive completion and restoration work in readiness for handback to the Local Authority in accordance with the permit and planning requirements. The work has been wide ranging and covered most aspects of the engineering of former landfills prior to return to beneficial use.

In particular we have provided design and construction supervision services for the capping system construction; preparation of a Site Restoration Plant for the use of soil forming waste materials as a waste recovery operation; the creation of a wide range of ecological habitats to form heathland, native woodland, glades and acid and native grassland and integration into a fully functioning ecosystem; design and construction supervision of the surface water management system; design and construction supervision of the burial of approximately 18 kilometres of active landfill gas pipework and lowering of associated infrastructure such as gas manifolds and condensate de-watering points; the re-establishment of a 1.3-kilometre public bridleway across areas of the historical tin and copper mine and the landfill containment cells. Egniol designed and managed the construction of the bridleway following discussions with the Rights of Way officer, Mining Consultants and the British Horse Society.

02. United Mines Pic 1

Our work at this challenging site is ongoing and we continue to bring our experience and expertise to bear in the restoration of this site.

02. United Mines Pic 2

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