Site Investigation Services
From the desk study, fieldwork and geotechnical laboratory testing to factual reporting, South West Geotechnical offers complete site investigation contracting services. With in-house staff and equipment we are not dependent on sub-contractors. This allows us to maintain quality and continuity with prompt project turnaround times.
We also offer cross consultancy contracting of technicians and engineers for monitoring, fieldwork and in-situ testing allowing consultancies to manage variations on workload.
Commachio 205 Multi System Drilling Rig
Puntel multisystem Drilling Rig
Dando 2500 Cable Percussive Drilling Rig
Three Window Sampling rigs
Dando Dual Mast Terrier
GeoNor H10 Self boring Shear Vane (ideal for soft ground)
Various limited access and hand held sampling equipment
Dynamic probe (DPL, DPSH)
Transport Road Laboratory Dynamic Cone Pentrometer (TRL DCP)
Point Load (to ISRM)
In-situ Rugged Troll automated groundwater level loggers
Geotech GA5000 Ground Gas Analyser
MiniRae PID with 10.6 ev lamp
Solar PV Pile Testing Equipment
Megger DET4/4 and DET2/2 ground resistance test equipment (up to 54m spacing)
Cat & Genny
Our Investigation Equipment include:
Our qualified staff and accredited laboratory is complemented by a comprehensive range of investigation equipment, including:
BRE Digest 365 Soakaway and BS6297 Percolation Testing, Devon To assist with planning for the redevelopment of a single residential property SWG undertook Soakaway testing in accordance with BRE Digest 635 for storm water drainage design and Percolation testing in accordance with BS6297 for septic tank soakaway design. It was a small side and so a small tracked excavator was used to access the site. Unfortunately the very low permeability clayey ground meant that soakaways were not suitable this time and an alternative drainage strategy was required.
Ground Gas Desk Study
Phase 1 Ground Gas Desk Study for redevelopment of a residential property Following submission of a Planning Application, the Local Authority expressed concern about a former quarry being a potential source of ground gas which could impact the proposed development. SWG undertook a Phase 1 contamination desk study and walkover survey to assist with planning conditions to and to produce a Conceptual Model of the site and identify the Source-Pathway-Receptor linkages between the quarry (source) and the proposed dwelling (receptor). The old quarries and associated pond located 25m south west of the site have been backfilled, in part, therefore, these features presented a theoretical source of ground gas. It was determined that as the quarries are not capped, any gasses generated would vent to the atmosphere rather than migrating laterally through the ground towards the development site. SWG argued that the use of modern construction techniques and a damp proof membrane with good sealing around pipes and floor structure will provide inherent gas protection measures. The desk study was accepted by the Local Authority and relevant warranty providers, subsequently planning was granted, saving the Client time and money.
Phase 1 desk study for conversion of barn to residential property SWG undertook a Phase 1 contamination desk study and walkover survey to assist with planning conditions to identify any potential contamination on a small a small barn site that is to be converted in to a residential dwelling. A series of historic maps were reviewed along with information on industrial land use, landfills, radon and subsidence. A conceptual model was developed which did not identify any significant sources of contamination. On this basis SWG recommended the ground suitable for use for a residential property without the need for a Phase 2 contamination investigation. The desk study was accepted by the Local Authority and relevant warranty providers, subsequently planning was granted, saving the Client time and money.
Investigation for industrial development above known coal workings, Bristol SWG undertook an investigation to assist with the purchase of an industrial estate in Bristol. The Client wanted to understand the risks associated with former coal workings beneath the site. SWG undertook a series of rotary cored boreholes with our very own Commachio 205 drilling rig to identify where coal seams has been worked. SWG produced a cross section through the site identifying areas of known workings and provided the client with advice on foundation design and recommendations, plus preliminary costs for remediation works for the future development.
We would be happy to discuss your project, so please get in touch.
Get in touch! 01884 252444