Eastbound Hwy 92 reopened in San Mateo after hazardous materials spill

The spill was about 40 gallons of sodium bisulfite, a type of corrosive material, according to the California Highway Patrol.

Bay City News
Friday, July 14, 2023
EB Hwy 92 closed in San Mateo due to hazmat spill, authorities say
Eastbound Highway 92 west of U.S. Highway 101 in San Mateo will remain closed for evening commute due to hazmat spill, authorities say.

SAN MATEO, Calif. -- A stretch of Highway 92 in San Mateo County is back open after the cleanup of a hazmat spill.

The video in the player above is from a previous report.

Eastbound lanes between Delaware Street and Highway 101 were shut down for more than 12 hours Thursday during the clean-up of what was estimated to be 40 gallons of sodium bisulfite.

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The spill was first reported at about 10:45 a.m. and led to the street closures and a shelter-in-place for anyone within a quarter-mile.

Sodium bisulfite causes irritation to eyes, skin and mucous membranes if inhaled, ingested or comes in contact with eyes or skin, police officials said.

The San Mateo County Department of Emergency Management said it is used for water treatment and poses a very low risk.

Sodium bisulfite is slightly corrosive and people are being advised to wash it off their vehicles if they drove through the spill.

The material leaked out of a 330-gallon tank on the back of a San Francisco Public Utility Commission truck that apparently developed a crack while in transit, according to San Mateo Consolidated Fire Department Deputy Chief Robert Marshall.

"(SFPUC) will be doing an inquiry into how the tank cracked and caused the leak and everything but at this time we don't know why," Marshall said.

Shortly after the spill was reported, the nearby Fiesta Gardens International School, which is running summer school classes, sheltered in place before eventually evacuating for the day, Marshall said.

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