Geo Environmental Engineering in association with Geo Environmental Drilling has completed a geo-environmental assessment for one of the world’s largest producers of speciality chemicals associated with personal care/hygiene, industrial, pharmaceutical and nutritional markets.
The scope of works has comprised a large number of dynamic sampling boreholes with groundwater and ground gas monitoring wells. In conjunction with the borehole investigation additional works were being completed to decommission silos and tanks on site, with the drainage network undergoing assessment and where necessary, cleaning.
Geo Environmental Engineering in association with Geo Environmental Drilling has completed a geo-environmental assessment for several sites across various boroughs of London where funding has been provided to redevelop the existing high rise for new accommodation blocks.
Access was restricted across the sites with the areas of investigation being highly populated by residents and members of the public, with the alleyways and footpaths being used to access the local shopping precinct. Consequently, the investigation method chosen was a lightweight, highly mobile dynamic sampling rig. This specialist piece of equipment allowed for boreholes to be drilled to c.5.00m below current ground levels whilst being located in areas where it would not be possible to position a cable percussion drilling rig.
The assessment was to aid future foundation design whilst assessing if any potential ground contamination was present associated with the historical land use prior to the construction of the existing residential blocks.
Geo Environmental Engineering in association with Geo Environmental Drilling has completed a brief foundation assessment for a residential property in South London that has been affected by subsidence.
Many mature trees surround the site and the existing structure has been extended at some point. Significant cracking and subsidence has occurred at the point where the two structures have been joined and an investigation comprising two dynamic sampling boreholes and three manually excavated trial pits was undertaken.
The boreholes were positioned to recover samples of the natural clay soils adjacent to the building and adjacent to the trees. The manually excavated trial pits were positioned to accurately record and photograph the foundations associated with the house and the extension. During the foundation excavations many rootlets were noted with samples recovered for DNA analysis.
Geo Environmental Drilling Ltd completed a detailed assessment of a former industrial site within North Yorkshire. The development area was a former agricultural machinery dealer with servicing and repair facilities. The site included both above ground and below ground fuel storage tanks with the building also including service/maintenance pits.
The site is proposed for a mixed commercial and residential end use, with a small supermarket and three residential properties (3 link houses) with general areas of soft landscaping, private gardens and vehicle parking.
The site was in a potentially sensitive area with shallow groundwater, nearby surface water features (Major River) and surrounding residential properties, so it was imperative that a detailed and accurate assessment was made.
Following the results of a detailed Site Reconnaissance Survey and a Phase 1: Desk Top Study Report the Phase 2 Ground Investigation works were designed to target the known sources of potential contamination (i.e. above ground and below ground fuel storage tanks) whilst providing an even site coverage to reduce the risk of undiscovered “hot spots” being present during the construction phase and to complete a Human Health and Controlled Waters Risk Assessment.
Dynamic Sampling Boreholes were drilled across the site prior to demolition of the existing buildings and hardstanding, with a watching brief to be implemented during the construction phase. Ground gas and water monitoring wells were installed with a period of monitoring being completed.
"Examples of Case Studies and photographs kindly provided by GED Ltd 2010"