Publisher Summary This chapter evaluates the impacts of the Sansinena explosion and bunker C-spill. The Sansinena, an 260-m, 70,000-ton tanker of Liberian registry under charter to the Union Oil Company, exploded and burned at the dock at Berth 46 in outer Los Angeles Harbor. The oil spread over the water and the U.S. Coast Guard estimated that most of the crude and some of the light fractions of Bunker C burned. The realization that the Bunker C would sink, especially if lighter fractions burned, caused revision of estimates of the amount of oil on the bottom. Oil that leaked under the dock and did not burn is trapped by the wreckage and pooled on the bottom 2.5-3.0 m deep. Final estimates were a loss of 20,000-32,000 bbl. Diver and grab sampler surveys of the bottom led to the conclusion that globs of oil were blown laterally through the air and/or water to lie widely splattered across the soft silty bottom.