Updated Wednesday, 1 p.m.
Fire crews remain on the scene of Tuesday's explosion and hours-long fire at NuStar Energy's storage facility in Crockett, where two large storage tanks that held ethanol burned almost entirely.
The fire led to a nearly 7.5-hour shelter-in-place order for parts of Contra Costa County and the shutdown of Interstate 80 in both directions.
Contra Costa County Fire spokesman Steve Hill said all of the facility's tanks have now been inspected, and officials have no concerns about the integrity of nearby tanks.
Firefighters from Chevron, Shell and Marathon oil's nearby refineries are working with NuStar firefighters Wednesday to tour the site and make final determinations, Hill said.
"They're going to vent adjacent tanks ... to relieve pressure and prevent fire," Hill said at a news conference.
Secondary containment ponds around the two burned-out tanks are now filled with material.
"We believe that's mostly water now," Hill said, noting that a team is making a final determination of the makeup of that material. Crews are now working to pipe runoff composed of ethanol, water and foam into containers.
Officials believe there's no further risk of fire, but said they're keeping blankets of fire-suppression foam applied to the site out of an abundance of caution. Fire crews will remain on-scene in case another ignition is triggered.
"We’ve used about 15,000 gallons of firefighting foam in the course of yesterday afternoon and into last night," Hill said.
"When the fire began, [the two tanks that burned] were filled to 1% of their capacity," Hill said.
He noted crews dodged multiple bullets in the last 24 hours in regard to how much worse things could have been.
"Even at 1% capacity those tanks had a lot of ethanol in them. That's approximately 3,000 barrels, which comes to about 126,000 gallons of ethanol in each tank."
Of the nearby tanks that were threatened, most of them contained ethanol — but one of them contained jet fuel.
Regarding health concerns for nearby residents, Contra Costa County's chief environmental health and hazardous materials officer Randy Sawyer assured reporters that there is no harmful benzene in the area.
"Our biggest concern is the particulates," Sawyer said. "We did find some unhealthy levels of particulates last night. When we called an all clear last night, it was in the healthy range for particulates ... We're not expecting any long-term health impacts from the fire."
Officials continue to say they cannot confirm any connection to Monday night's 4.5 magnitude earthquake, centered near Pleasant Hill.
That quake caused malfunctions at two nearby oil refineries operated by Shell and Marathon oil, Sawyer told KQED previously.
"Anything related to the earthquakes as a cause to the fire would be speculation at this point," Hill said.