The objectives of this study were to measure the risk of oil spills and estimate the costs associated with alternative transport and intermediate storage systems from OCS oil fields to United States west coast terminals and refineries. This was accomplished through a review of past oil spill statistics and analyses, and application of the data to the specific conditions of Gulf of Alaska OCS. To assist in specifying these conditions, a series of strictly hypothetical scenarios were established. Representative production sites were selected without the benefit of dependable estimates of specific reserve locations.