We have recently been appointed for a number of commissions for remediation resulting from leaking domestic central heating fuel. Testing and treatment of oil contamination is carried out by a specialist contractor and our involvement is relating to removing contaminated soil beneath floors and foundations to the building. This work can become very involved, particularly when adjoining properties are affected with the requirement for a party wall award. It is not only the soil which can become contaminated as oil can penetrate foundations and masonry walls resulting in the need for removal and replacement with clean masonry and concrete. We advise on the effect on the structure, required sequence of works and temporary propping to enable the work to be carried out safely.