Over the last two decades, Geotechnical Baseline Reports (GBRs) have become increasingly common for trenchless construction projects using the American Society of Civil Engineers (ASCE) Guidelines. The Guidelines have been established to provide assistance for owners, preparers, and users of GBRs. These guidelines have been extremely useful for educating owners and contractors in the role and application of the GBR in the distribution of financial riskfor geotechnical parameters. However, the guidelines have typically been written for conventional tunneling. This has resulted in some pitfalls when the baseline statements are applied to microtunneling projects.
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