The mixture of two chemicals by a cleaning crew at Taylor Farms, 100 W. Valpico Road, created a hazardous vapor that sent 20 people to the hospital this morning.
According to Tracy Fire Department Division Chief Andrew Kellogg, the accident happened before 6 a.m. He said the two chemicals were acetic acid and chlorine. According to the U.S. Poison Control Center, the mixture of those two substances — chlorine can be found in bleach and acetic acid is common in vinegar — can create a chlorine gas that attacks the mucous membranes inside the nose and lungs.
The hazmat team from the Defense Logistics Agency depot is inside the building to determine how far the vapor spread and how to clean it up.
Kellogg said the vapor does not pose a danger outside the Taylor Farms building to homes and businesses nearby. He said the 20 people with moderate to serious injuries were taken to several area hospitals by six ambulances, including one from Alameda County.
Tracy police officers have closed Valpico Road from Glenbriar Drive to the intersection between Raley's and the AM/PM gas station just east of Tracy Boulevard.
At 9:45 a.m., the Tracy Fire Department turned over the cleanup of the chemical spill at Taylor Farms to the business owners and Valpico Road was reopened.