Michael Catania walks on a rocky beach at Petty's Island. He picks up a flat stone and flings it out into the Delaware River. The stone skips a few times toward a shipping terminal and the church steeples of Philadelphia's Port Richmond neighborhood.
"I feel like a little boy when I come here," said Catania, chairman of the New Jersey Natural Lands Trust.
Wooden stakes protrude from the ground. The remains of an old pier line the perimeter of the beach. Plastic bottles, old tires, a TV, and bricks sliced in half — one side "key," the other "stone," litter the shoreline.