L52287 Pre-Construction Drillability Assessment for Horizontal Directional Drilling in Rock

Construction contractors often claim extra compensation associated with horizontally directionally drilled (HDD) pipeline installations is needed when drilling in rock. These claims result from HDD contractors' allegations that rock properties experienced during construction are significantly different from the properties on which the contractors' bids were based.

This report provides information and recommendations that improve exploration and testing methods for assessing the drillability of rock to be encountered on HDD pipeline installations. These improvements will lead to a better understanding of rock drillability which will in turn lead to more accurate bid prices and more effective drilling plans. Pipeline installation costs will be reduced by reducing claims for extra work, improving contractor efficiency, and decreasing risk associated with HDD installations in rock. This report also addresses contractual considerations and alternate dispute resolution.