The most disturbing part of the story is that they're not all from the latest oil rig leak. Where are the others from?
NOAA Web Update May 15, 2010 DEEPWATER HORIZON Incident
Situation: Saturday 15 May – NOAA continues to provide scientific support including: modeling the trajectory and location of the oil, conducting shoreline oil assessment surveys, conducting oil chemistry analyses, and evaluating open water and shoreline remediation techniques.
Undersea dispersant application resumed this morning and BP is doing continuous testing. If tests reveal something we are concerned about, the dispersant application will be stopped.
Skimming and in-situ burning was planned but postponed until the weather is more moderate. Aerial dispersant application did take place.
Tarballs were reported west of Galveston, Texas to the Florida panhandle. Testing already underway has shown some tarballs to be from this spill and others not.As of today, 1.6 million feet of boom have been deployed, and all the ports remain open.
Over 11,000 people were working on the response today.
http://www.incidentnews.gov/attachments/8220/527210/DeepH2Oweb_15May.pdf