API/SC-PCO SOUTHERN CALIFORNIA 1978 OIL SPILL TEST PROGRAM

Abstract

ABSTRACT Using Alaskan crude in a special offshore test zone authorized by an EPA Research Ocean Dumping Permit, API/SC-PCO generated a series of small oil slicks for testing dispersant application methods and mechanical cleanup equipment in late September 1978. Seven test slicks ranging in volume from 5 to 20 barrels (bbl) were sprayed with low-toxicity dispersants using a helicopter, a crop-dusting monoplane, and two types of boat-mounted spray systems. A Cyclonet 100 centrifugal skimmer was tested on an eighth slick. In addition, a capsule demonstration in which four one-barrel slicks were generated and dispersed provided agencies, media, and the public the opportunity to witness the use of dispersants at close range. The technical and operational testing was supplemented by detailed chemical and biological monitoring studies and by extensive motion picture and air photographic coverage. Field observations and photographic documentation indicate that: the two dispersants tested dispersed the Alaskan crude; the four dispersant application techniques tested are all viable methods for applying dispersants to oil spills at sea; and, the Cyclonet recovered oil, but the test slick was too small to assess the Cyclonet's probable performance in a major spill situation. This test use of dispersants on oil slicks at sea is a key step toward more effective control and cleanup of spilled oil in the open ocean.