I've never seen that before.

The sight of it alarmed local residents such as Richard Katz.

I've been here 30 years in that house right there.

No, I've never seen a spill like that before.

Environmental groups are worried about the potential harm toe wildlife David Lewis is with the group Save the Bay right next to the Chevron Long Worf is one of the major haul out areas for harbor seals this time of year.

There's a lot of migratory birds that are on the surface of the bay and, of course, all year round There's a fish and sharks and wildlife in the water that could be poisoned by this kind of oil.

In an email to Reuters, Chevron said it first noticed a sheen on the water around 3 p.m. On Tuesday near the wharf at its Richmond refinery.

It said clean up was underway.