I don't have specific information about Seal Beach, but Tar Balls are completely natural and are not [necessarily] caused by drilling.
The are decomposed by a number of bacteria, and unless you happen to know of a spill nearby are not an indicator of a problem. In fact drilling for the oil can reduce them by reducing the pressure that would otherwise squeeze them out.
The are decomposed by a number of bacteria, and unless you happen to know of a spill nearby are not an indicator of a problem. In fact drilling for the oil can reduce them by reducing the pressure that would otherwise squeeze them out.