Case Study - Imperial Wharf
SUMOplus+ at Imperial Wharf
Hitting buried utilities can be disastrous to a projects smooth running. SUMO carried out a SUMOplus+ survey on this site in Imperial Wharf to help the client locate buried features and avoid potential issues.
SUMO asked to assess the site for buried foundations and evidence of contaminated ground over the site of a former Victorian gas works.
The client believed that extensive contamination of the soils had occurred. This was consistent with the production of town gas from coal.
Substantial foundations from the former gas works were also thought to be present.
SUMO conducted a ground conductivity survey.
The site at the time of the survey had been cleared leaving a surface of hard-core rubble and concrete slabs.
The survey used a Geonics EM31 ground conductivity meter to locate the buried features.
The survey determined two extensive blocks of foundations 35m long and 10m wide separated by 20m.
The inphase (metal detecting) data shows a marked level of activity. This suggests the foundations may contain structural steelwork or heavy reinforcing.
Around the easterly foundation is a marked "halo" of lower conductivity readings. This is interpreted as a pollution plume probably associated with the former use of the site as a gas works.
click on the images below to expand:
The survey was carried out with a Geonics EM31 ground conductivity meter collecting data at 1m centres along transects 2m apart.
Both quadrature (conductivity) and inphase (metal detecting) data for the vertical dipole position only were collected. This provided "imaging" to a maximum depth of 6m.