We worked for Southern Gas Networks (SGN) on the gas works site in the town of Woking, located in beautiful Surrey County.

The project consists of conducting site investigations and building demolition; the site investigations include mechanically excavating trial pits/trenches to identify underground structures, and to delineate the extent of contamination, and to vacuum-excavate trial pits within the SGN operational area.

Building demolition includes the demolition of the Booster House and ancillary structures, pits and pipework located around the site.

This site was challenging as the existing electricity substation, access gates and perimeter fence were to be retained and protected throughout the contract.

Site overview video:

We were appointed as the CDM Advisor for the project. Our roles included checking the Principal Contractor’s Construction Phase Plan (CPP) and reviewing the Risk Assessment and Method Statement (RAMS) for the project before issuing the Authorisation to commence construction activities.

Throughout the project’s period, we carried out audits which were planned to coincide with the specific phases of the project. Such audits included the CDM compliance audit, a specific environmental audit to ensure the sludge and waste were removed in line with the Environmental Agency’s requirements, and a process specific demolition audit.

• Review and comment on the Construction Phase Plan and issue a report.
• Review and comment on the Risk Assessments and Method Statement and issue a report.
• Carry out the pre-start CDM site audit and issue a report.
• Carry out the environmental site audit and issue a report.
• Carry out the demolition process site audit and issue a report.