The former gas manufacturing plant covered an area of 3.5 hectares and retained live gas storage/distribution plant including medium pressure gas mains through the centre of remediation areas. I & H Brown played a significant role in pre-remedial works, including extensive liaison with the design team, the local regulatory bodies and Transco to ensure a smooth transition from conception to construction.
Key elements of the on-site works included:
• Excavation of 5,000m3 of soil/rubble for screening/crushing to produce fill for on-site re-use;
• Excavation and screening of 30,000m3 heavily contaminated soil to recover material suitable for crushing and on-site re-use;
• Stabilisation of 5,000 m3 of tarry wastes for disposal
• Visual separation of contaminated soils into stockpiles for chemical testing to establish final disposal route;
• Treatment and analysis of waters for discharge to sewer in accordance with discharge consent
The approach implemented by I & H Brown resulted in 70% of soils being recovered for on-site re-use as engineered fill. Vegetation was composted and re-used on site as mulch. The overall recovery process ensured that no import material was required.
The project was completed on schedule some 7% under budget, despite excavation volumes increasing by 25%, and successfully reduced environmental impacts below the anticipated levels. This excellent all-round performance was recognised by our client with the award of the National Grid Transco Chairman’s Award for Safety, Health and Environment.
“The project team are to be congratulated for the standard of work…The site demonstrated good implementation of an EMS at a project level including local aspects, objectives and procedures.”
Environmental Audit Dunfermline Gasworks
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