People in Ventura County are also concerned that an early estimate—which noted that about 420 gallons of crude oil was accidentally released into a waterway last fall—is inaccurate. Local and federal officials are investigating.By Steven RodasSANTA PAULA, Calif.—As he slowly pulled his beige van into the driveway following a trip to the hardware store for garden supplies, Ethan Higbee didn’t suspect anything was wrong.