Working either as a contractor, or providing complete management of earthworks, SWG can design,schedule, monitor and validate earthwork schemes. Working closely with the laboratory and the consultancy teams, we specialise in working with contractors delivering the placement of engineered fill.
Monitoring and Site Services
Our Geo-technicians are well trained and equipped to help with cross consultancy site work.
Monitoring and Site Services:
Our Geo-technicians are well trained and equipped to help with cross consultancy site work such as:
Ground gas and groundwater monitoring using a calibrated GA5000 gas analyser, MiniRae Photovoltaic Ionising Detector (PID with 10.6ev lamp) and Dipmeter
Permeability / soakaway testing to BRE365
Plate bearing tests*
Plate or large scale settlement tests
CBR tests (TRL DCP and Plate bearing methods to IAN 73/06 – HD25)*
Medium to long-term groundwater monitoring and ump test analysis using automatic in-situ groundwater level logging equipment (14No. In-Situ Inc. Rugged Troll data loggers)
Small and large scale ground resistance / resistivity surveys, with specific reference to renewable such as utility scale Solar PV and wind turbines
Small and Large sand replacement density tests*
*Denotes UKAS accredited tests
Working either as a contractor, or providing complete management of earthworks, SWG can design, schedule, monitor and validate earthwork schemes.
Working closely with the laboratory and the consultancy teams, we specialise in working with contractors delivering the placement of engineered fill. We can provide practical and concise advice on specifications and adjustments in working practices to be as efficient as possible while meeting the requirements set.
We have managed schemes from 500m3 to 1.5Mm3 in volume such as the CERC energy centre, Par, Cornwall and Westpark 26, Wellington, Somerset.
We area UKAS accredited for both our laboratory testing and in-situ testing, including plate bearing tests, CBR tests (both TRL and plate bearing methods) and density (sand replacement) amongst others.
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.
CBR & Plate Bearing
SWG is a UKAS accredited supplier for regular California Bearing Ratio (CBR) tests by either plate bearing or Transport Road Laboratory Dynamic Cone Penetrometer (TRL DCP) methods. We also provide UKAS accredited Plate bearing testing using 300, 450 and 600mm diameter plates. Applications for these types of test include Road Pavement design, formation and subgrade assessments, adoptable highways, mobile and tower crane stability and pile matt design to BRE470. If further advice is needed for any of these design aspects please get in touch.
Our full UKAS schedule can be referenced on the UKAS website using the following link:
We would be happy to discuss your project, so please get in touch.
Get in touch! 01884 252444