Construction Phase Support

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Lithos are able to help with ground-related problems that sometimes arise during the construction phase of a project.

Stockpile Testing & Waste Classification

Where surplus arisings cannot be accommodated on sites, our engineers can sample stockpiles, schedule appropriate testing, and then provide advice with respect to waste classification or suitability for transfer to other development sites (see Materials Management Plans).

Disposal of surplus made ground, or contaminated natural soils, to landfill may be the only practicable solution if redistribution and retention on site is not feasible or earthworks generate a surplus. Characterisation, sampling and classification of soils arising from brownfield sites has been incorporated within the Environment Agency’s Technical Guidance WM3 (“Guidance on the classification and assessment of waste” version 1.1. Environment Agency 2018). Classification of soils in accordance with WM3 is quite a complex process, although it ultimately results in a simple classification as hazardous or non-hazardous.

If waste soil is classed as hazardous following classification under WM3, and destined for landfill, waste acceptance criteria (WAC) leachate testing will need to be undertaken.  Similarly, if waste soil destined for landfill is classed as non-hazardous under WM3, and suspected to be inert, WAC leachate testing will need to be undertaken.

It is critical that material to be exported from site is allocated an appropriate waste code, following the 7 steps within WM3.  Waste carriers transporting, and sites accepting, this material should have a corresponding code within their permits.  Under the Waste Duty of Care Code of Practice, it is the responsibility of those generating the waste (i.e. the site), to ensure that the waste is handled and disposed of appropriately.  However, Lithos are able to undertake the necessary assessment on the developer / contractor’s behalf and produce a comprehensive report that clearly shows each of the seven steps have been followed.

Pre-tender Bid Support

Lithos can review existing data (including previous site investigation reports) in order to highlight key ground-related issues that require pre-tender consideration.  We also provide telephone support and answer e-mailed queries during the tender period, and can attend meetings as required.

Geotechnical Inspections

Inspection of Gas Protection Measures

Soil Cover Validation

Environmental Audits