Contractors in the construction industry, as in any other business, face a certain amount of risk involving a loss of profits or over expenditure. Owing to the high degree of competition in the construction industry, all contractors are expected to operate under a certain amount of risk when constructing a project. The success or failure of any venture depends on how it is handled. The construction industry has had a poor reputation for coping with risks, with many projects failing to meet deadlines and cost targets. Clients, contractors, the public and others have suffered as a result (Thompson 1995). In public utilities projects such as water and sewage facilities and electrical and telephone lines, trenching excavation is one of the various risks faced by the contractor
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