City crews and an environmental contractor successfully contained about 50 gallons of sulfuric acid that spilled onto Interstate 25 before any could leak into the South Platte River, officials said Friday.
Public Works and Environmental Health officials used large amounts of sodium bicarbonate, or baking soda, to neutralize and absorb the sulfuric acid, said Meghan Hughes, spokeswoman for the Department of Environmental Health.
Nancy Duncan, 54, the driver of the Southern Refrigerated Transport semitrailer truck that spilled the acid Thursday night, was not cited for the spill, according to a Denver police record.

Duncan told police she was traveling 35 mph about 7 p.m. when a car stopped abruptly in front of her, forcing her to slam on the brakes. She told police that is what she thinks caused one of 10 containers she was transporting to leak.
A representative from the Illinois transport company could not be reached.
Hughes said that when the final cost of the cleanup is tabulated, it will be billed to the trucking company.
Northbound lanes of I-25 near University Boulevard were reopened at 6 a.m. after crews worked nonstop through the night to clean the spill, said Stacey Stegman, spokeswoman for the Colorado Department of Transportation.
The semi was carrying 10 totes, or plastic drums, of the acid, weighing about 38,000 pounds. When hazmat crews were able to enter the truck's trailer about 10 p.m., they found one tote ruptured, but the nine others appeared intact.
Fire crews created dams around the spillways in an attempt to keep any more acid from flowing into the drainage system.
The drainage systems along the highway belong to CDOT but eventually flow into the South Platte River.
Some vehicles initially drove through the spill. Champagne said the acid could corrode those vehicles.
Gary Lasswell, compliance manager for the city's environmental quality division, said the contractor made a slurry with baking powder and water, and let it flow into the drain to neutralize the acid that flowed into the drain.
Lasswell said none of the acid reached a second drain about 250 feet below.
The city has crews at the site of the spill and will continue to monitor the situation, Hughes said.