(CNN) – BP said Monday that the cost of its response to the Gulf oil disaster now totals approximately $3.12 billion. That includes containment, relief well drilling, grants to Gulf states, claims paid and federal costs, the oil giant said. The Fourth of July weekend brought beach-goers to the Gulf shore, despite the oil spill. But how safe is the water? The town of Pensacola lets people swim, but is anyone sure the water is really safe? Our John Zarrella reports.