INSTITUTE, W. Va. — A giant cloud of gas derived from the chemical that killed thousands last year in Bhopal, India, escaped Sunday from Union Carbide's plant here, injuring six employees and causing almost 200 nearby residents to seek medical treatment for respiratory and skin irritation.
Union Carbide blamed the leak of aldicarb oxime, the main ingredient in the popular farm pesticide Temik, on a valve failure after a buildup of pressure in a storage tank containing 500 pounds of the chemical. Carbide spokesman Dick Henderson called the chemical an "eye and lung irritant." The leak began about 9:25 a.m.
Gas Rolls Over Towns
The 200-yard-wide cloud of yellowish gas rolled over the towns of Dunbar, Institute, Nitro and St. Albans before dissipating around noon. "It sort of moved in like a fog," said Pat Baciu, a service station attendant at Dunbar. "It had a sort of sulfur smell to it, just sort of stunk. My eyes got a little bit red and I got a little sick at my stomach."
The leak also closed roads in the narrow Kanawha River Valley, including Interstate 79 and West Virginia 25, for up to an hour. Stranded motorists reported a choking and burning sensation from the fumes, which smelled "strong, bitter, kind of like gasoline," according to one driver.
Henderson said aldicarb oxime is made from MIC--the deadly pesticide ingredient that spewed from a pressure relief valve at the Bhopal plant, killing more than 2,000 persons--but does not contain any MIC itself.
Small Amounts Seen
"At most there might be a few parts per billion because a few molecules didn't react fully, but that would be all," he said.
Temik poisoning can cause nausea, vomiting, diarrhea and blurred vision. Severe cases may result in damage to the central nervous system and death.
Suspected Temik residues figured in last month's watermelon pesticide scare in California. State officials ordered grocers and wholesalers to destroy all their melons after about 180 persons in four Western states and Canada became ill.
The Institute plant was shut down after the Dec. 3 Bhopal leak because of fears about the safety of its MIC unit. It resumed production May 4 after installation of $5 million in new safety equipment that company spokesman Thad Epps said made "a safe unit safer."
Henderson insisted that the aldicarb oxime leak on Sunday "never was a threat to the community." A company statement said that much of the chemical "was neutralized through venting to a scrubber and flare."
But Kanawha County officials declared an emergency when the leak was reported. They advised the 3,100 residents of Institute to stay indoors and told those outside to cover their eyes and mouths and seek shelter.
The emergency declaration was terminated shortly before noon.
"We activated our computer tracking and it showed most of the material went back over the plant, southwesterly," Henderson said.
Sheriff's Lt. I.D. Burdette said the area of the plant where the leak occurred was flooded with water to contain fumes.
Warning Siren Sounded
Carbide officials said they sounded the warning siren as soon as they knew of the leak. But some residents complained that the chemical cloud had already sickened them before they heard the siren.
Kanawha County Sheriff Danny Jones said his department was not alerted until at least 12 minutes after the leak occurred and possibly not for as long as 24 minutes.
"I didn't know what it was when I saw that white cloud go up, disperse and spread out," said Crawford Willis, a custodian at nearby West Virginia State College. "I just locked the building, picked up my wife and took off."
Barbara Cyrus, who lives 500 yards from the plant, said the first thing she noticed was a strong odor seeping into her house.
"I thought maybe it was the cat litter," she said. "But then I opened the door to pick up the paper and it almost knocked me down."
Her husband, Clifford Cyrus, said he immediately thought of leaving the house "but I didn't hear no whistle so I didn't know what to do. About 10 minutes later we heard the whistle and then we headed toward Charleston."
The plant siren tells residents to seek information on the radio or television. County officials broadcast alerts telling residents to remain indoors.
Paramedic supervisor Phurman Williams, who helped treat people at the emergency center, said residents were "very disturbed--very. What I've heard is that the warning to the surrounding communities wasn't relayed as quickly as what they thought it should have been."
Henderson disagreed. He said the plant's emergency siren was sounded as soon as the leak occurred. "Most everyone stayed indoors and it's good to see that the system worked," he said.
Major highways near the facility were blocked, and almost 200 persons streamed to a makeshift treatment center that officials set up in the parking lot of Shawnee Golf Course several miles away. Not all were suffering ill effects from the fumes.