Asbestos removal works included the removal of some 3,000m2 of asbestos insulation board to the GWR maintenance shed.

Remediation works were carried out throughout and formed the main part of the works package. Prior to commencing works a full site investigation was undertaken on a 25m grid basis, all trial pits were dug until natural clay was found. Following the site investigation works we completed a remediation design prior to commencing the full site remediation works. Typically following the demolition phase of a particular area, the bulk of the contaminated material was in the form of rail ballast and soil. Prior to any remediation work taking place, the remediation strategy was then implemented for that area which determined the methodology and approach to this phase of the project. The remediation area constituted up to 5.5 hectares in size across 5 sub-areas.

In total 160,000 litres of hydrocarbon containing liquids were removed from the site. We excavated 100,000m3, backfilled 45,000m3 and installed capping material across site at 25,000m3. Comprehensive validation testing data was also undertaken on all backfill material with detailed handover packs completed for each area of the site.

We maintained strict working regulations with respect to adjacent stakeholders such as TFL (Crossrail depot), Network Rail (Great Western Rail) and Hitachi. This included trackside PTS regulations and asset protection in the form of the 5m Asset Protection Approval process whereby plant could only operate outside of the zone of influence. This agreement was ultimately agreed and implemented by TFL issuing us with a Letter of No Objection.