Until the early 60s every beach from Santa Barbara to Mexico was covered with tar and it never hurt a damn thing except that every time I went to the beach I got a scrub down in a tin pan with kerosene and a scrub brush before I was allowed into the house.
There was so much tar at Golita that the beach was totally black and the Spanish used to beach their ships to tar the bottoms.
To what volume are you referring?
This thing is somewhere between a 10x and 100x larger flow than is being broadcast. Do the math. Also, don't forget the methane and other natural "cracking" byproducts at depth, and what that results in. (prepositional tail supplied on purpose to avoid expletive noun terminator).