STG Engineering is a small geotechnical consultancy based in the South Hams with over 15 years’ experience. Working alongside local architects, civil engineers, structural engineers and builders we offer high quality geotechnical sitework to include:
- Slope Stability (Rock & Soil)
- Ground Investigations
- Soakaways and Percolation Tests
- Compliance Testing of Engineered Fill
We offer competitive rates including a free initial site visit to discuss your needs with a quick and efficient turnaround. Upon completion of siteworks a specific report is issued ranging from basic to comprehensive dependent on the requirements.
Slope Stability Analysis:
We undertake visual assessments on both rock and soil slopes to include cliffs, cuttings and embankments to identify cause and extent of failure, if further failure is expected and site dependent actions required. Further assessment/monitoring maybe required in conjunction to a Ground Investigation or a detailed rock inspection using rope access engineers if required. Upon completion, a Slope Stability Report is issued outlining recommendations and options for remedial works, which can be passed onto design engineers for approved remedial works if required.
Ground Investigations (Phase 1 & 2):
Phase 1 – site walkover in conjunction with OS Maps, documents and databases to produce an interpretative desk study report outlining site settings, potential geological hazards and environmental issues including potential site contamination.
Phase 2 - Intrusive investigation tailored to your requirements to determine the engineering properties of soil and rock to obtain necessary geotechnical parameters (bearing capacity, angle of friction etc) for foundation and retaining wall design. Samples are obtained for analysis and subsequent testing in a UKAS accredited laboratory by either Trial Pits (hand-dug using insulated tools to 1.20m depth or machine excavated to 3-4m depth utilising local plant hire) and/or Window Sampler (WS) boreholes using a tracked rig to depths of 8m. The WS rig can also undertake Standard Penetration Tests (SPTs) to depths of 8m and continuous Dynamic Probes (DPs) to depths of 12m in conjunction with hand-held Dynamic Cone Penetrometers (DCP’s) to distinguish different stratums, soil strengths (N Values) and determine depth of bedrock.
In addition, the potential contamination risks to human health, property and the surrounding environment is investigated by obtaining soil samples with geo-environmental testing (hydrocarbons, heavy metals and asbestos) undertaken in a MCERTS accredited laboratory.
Within the WS boreholes, standpipes can be installed for monitoring gas, groundwater and movements (piezos/inclinometers). We can undertake rounds of monitoring to identify any gas (methane, carbon dioxide, oxygen, hydrogen sulphide and carbon monoxide), groundwater levels on site and obtain groundwater samples for geo-environmental testing for contamination in a MCERTS accredited laboratory.
Upon completion of all works an Interpretive Ground Investigation Report (GIR) is issued.
We undertake Soakaway Testing for Surface Water soakaway design in accordance to BRE Digest 365 to obtain soil infiltration rate, f and subsequent design of sizing a soakaway within a Surface Water Soakaway Report.
In addition, we undertake Percolation for Foul Water drainage fields in accordance to BS 6297: 2007, Regulations Approved Document H – Drainage and Waste Disposal (2015) to obtain percolation value, Vp and subsequent floor area, At and length of pipe required within a Foul Water Drainage Field Report.
We undertake a range of in-situ tests to ensure adequate compaction of engineered fill has been achieved in accordance to BS 1377 and includes: Plate Load Tests (PLT’s), plate CBR’s, hand-held Dynamic Cone Penetrometers (DCP’s), Sand Replacement Density (SRD) and Shear Vanes. Apart from SRD, the results of each test can be calculated within minutes to confirm whether compaction is adequate as per the specifications of a Geotechnical Design Report (GDR).
Upon completion of works a comprehensive Earthworks Validation Report is issued.
With CSCS, IOSH and Emergency First Aid Trained we can work on a variety of sites supervising site work, earthworks, ground investigations and engineered fill for other projects.
Furthermore, Personal Track Safety (PTS) and Individual Working Alone (IWA) competency allows work to be carried out on the railway sector.
Full geotechnical logging (Structural, Interval and Sampling) can be undertaken on rock cores for mining and civil industries.
Call us or send us a message via the green message button to discuss your requirements