Silkstone Environmental undertake a range of site investigation, geotechnical and geo-environmental services which can be integrated with any of the other services provided by the company. Reports are comprehensive and concise and where required include an executive summary written in plain English for the non-technical reader.
Site Investigations are undertaken where ground conditions require characterisation. This may be for one or more of the following reasons:
- To satisfy planning conditions
- To satisfy a building control, bank or insurance company requirement
- Environmental due diligence for property acquisitions
- To assess the potential risk to human health and the environment from contamination
- To enable the correct design of foundations or excavations for new build or infrastructure engineering
- To investigate a problem with rock faces, slope failure, subsidence, collapse, heave, or problems caused by historic mining (including coal and other minerals) or quarrying activities
- To assess mineral reserve
Depending upon the specific requirements of the project, a phased approach is usually followed involving the following:
Phase 1 Preliminary risk assessments (desk studies)
These typically include an historical land use review, a site walkover (inspection/ reconnaissance by an appropriately qualiﬁed and experienced Silkstone Environmental engineer) an assessment of the underlying geology and potential impact from mining, an assessment of the hydrogeological conditions and the site hydrology, the proximity of areas of ﬁlled ground (including landﬁlls) and a conceptual site model to identify potential pollution source, pathway-receptor linkages and geo-environmental risk assessment.
Phase 2 (Intrusive) investigations for geotechnical conditions
These investigations are undertaken where it is necessary to determine ground conditions for construction or excavation. Both factual and interpretative reports can be provided.
Phase 2 (Intrusive) investigations for contaminated land
These investigations are undertaken on 'brownﬁeld' land and determine the level of risk from contamination and, where appropriate, from ground gas.
Phase 3 Remediation strategy
This includes a review of the contamination remediation options (options appraisal) and strategy for the preferred option (with remediation supervision and / or validation monitoring).
Phase 4 Post remediation veriﬁcation report
This records the remedial works carried out with reference to relevant documentary evidence, including post remediation testing results.
Techniques used in intrusive investigations include the following:
- Cable percussion, rotary drilling and windowless / dynamic sampling
- Dynamic probing
- Trial pitting with machine excavator (including soakaway testing where required)
- Ground penetrating radar and other geophysical techniques
- Laboratory testing using accredited laboratories
Other services related to ground conditions include:
- Design, supervision and construction quality assurance (CQA) of earthworks, including embankments, clay liners for ponds and lagoons, and landﬁll liners
- Design and supervision of operations to make safe mine and quarry workings, and natural voids
- Slope and rock face assessments for health and safety, and design and supervision of new faces and slopes
- Investigation of ﬂooding and design of remedial measures
- Expert witness work in any of the ﬁelds described