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: Costain Skanska JV – HS2 Euston Station, St James Gardens – Waste Classification Package

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Costain Skanska JV – HS2 Euston Station, St James Gardens - Design & Project Management of Waste Sampling, Classification, Reporting & Recovery.

Client: Costain Skanska JV / L-lynch Plant.

Role: Design & Project Management of Waste Sampling, Classification, Reporting and Recovery.

Contaminates: Asbestos, Heavy Metals, Hydrocarbons, Japanese Knot Weed.

Unyte Waste were engaged by CSjv to undertake an independent review of the waste arisings and recovery potential for the HS2, St James Gardens scheme. Unyte Waste were contracted to assess the potential for classification and reuse of the 92,000 tonnes of arisings. The soils are planned to be removed from site from July 2018 through to the completion of this package of works, in Autumn 2019.

The site forms part of the larger HS2 development scheme, with the St James Gardens being site of an historic burial ground dating from 1789-1853, since capped with imported soils prior to being opened as a public open space. Various areological works are planned to be undertaken during the excavation works, which are expected to generate in the region of 92,000t of arisings during the works, mainly hand excavated.

There are known areas of contamination in the forms of Japanese Knotweed infestations, Heavy metals and PAHs. The soils are were initially classified as non-hazardous due to the lack of ground investigation data, traditional intrusive investigative techniques would not be utilised due to the requirement to exhume the buried graves, without disturbance.

Through our specialist waste classification experience, Unyte Waste were able to design a sampling and classification process that would comply with all relevant legislation, as well as the relevant acceptance criteria for the recovery sites. This process was undertaken, the resulting classification report produced was used for the classification of the waste streams to the recovery, disposal and treatment facilities that were identified by Unyte Waste. Through our detailed understanding of both waste classification as well as the on-site construction restrictions, we delivered a saving to the project of £2,025,450.00 as a large majority of the materials were classified as Inert.