“…In addition to oil from the proposed lease tracts, the tankering of oil produced in Norton Sound leases (OCS Lease Sale 57) through the St. George Basin study area was also considered in a cumulative analysis of oil spill risks. The estimated conditional mean value of oil produced in Norton Sound and tankered through the St. George basin study area is 480 million barrels (Samuels and Lanfear, 1980). We cannot overemphasize that these estimates are based on the assumption that oil is present; if it is not present (a 72-percent probability), then, obviously, no oil spill risks exist.…”