By Peter Fimrite, Marisa Lagos, Jill Tucker, Chronicle Staff Writers
Residents and officials throughout Marin County were upset Friday that they were not notified for almost a day that 2.7 million gallons of treated and raw sewage had spilled into Richardson Bay.
The stinking flow of effluent poured out of the Sewerage Agency of Southern Marin plant in Mill Valley between 5:30 and 8:30 p.m. Thursday and eventually flowed into the eastern arm of Richardson Bay, a sensitive tidal marsh with currents that can carry pollutants past Sausalito and Tiburon into San Francisco Bay.
The amount of spilled sewage would cover a football field - including the end zones - 6.3 feet deep, enough to endanger wildlife, dogs and any people who entered the water.
Signs were posted along Marin County shoreline and at San Francisco beaches - including Crissy Field, Baker Beach, China Beach and Aquatic Park - to discourage people from entering the water.
State regulators were notified about the spill before midnight Thursday, but local officials, environmentalists and regular users of the bay were not told in some cases until 20 hours later.
“We’re asking why there was such a delay,” said Marin County sheriff’s Lt. Doug Pittman, the spokesman for the county Office of Emergency Services, who said the county wasn’t notified until around 9:30 a.m. Friday.
“Coming on the coattails of the Cosco Busan (oil spill) response, any delay is something we are concerned about,” he said. “In the next few days, we will be trying to find out why there was such an untimely delay.”
The warning signs at local beaches were put up as a precaution, although not until Friday afternoon - long after many residents had finished their morning swim in the chilly bay. Water quality experts won’t know until tests come back Saturday how much pollution is still swirling around.
Stephen Danehy, the general manager of the sewerage agency, said the spill occurred because a worker failed to set up enough pumps to handle all the water in the Mill Valley plant.
Typically, sewage plants pump effluent into holding tanks during heavy rains to prevent the system from being overwhelmed by water, but that apparently never occurred, causing a backup.
A blend of treated and untreated sewage overflowed after all the plant workers had left. It poured into Arroyo Corte Madera del Presidio creek and flowed into Bothin Marsh, a tidal wetland of Richardson Bay.
An alert system notified an off-site, private dispatch service, which should have let an on-call operator know, Danehy said. But the operator didn’t answer and instead of calling Danehy, as per procedure, the dispatcher left a message.
A plant worker monitoring operations on his computer was the first to notice the problem around 8:30 p.m. Thursday, Danehy said.
The state Office of Emergency Services was notified of the incident at 11:16 p.m. Thursday and was told the spill occurred sometime between 5:50 p.m. and 8:30 p.m., said agency spokesman Kelly Huston, who expressed concern about the delay in reporting the incident.
“They’re supposed to notify us as soon as they’ve discovered there was an incident,” Huston said.
But several county and local officials complained that they didn’t learn about the spill from state officials until Friday afternoon.
Tiburon Town Manager Margaret Curran said she was notified shortly before a 2 p.m. teleconference with state emergency officials.
Many bay swimmers were furious.
“I believe it unconscionable that … officials felt there was no need to report this spill for nearly 20 hours,” said Gary Emich, a member of a San Francisco Bay swimming club. “I was in for 45 minutes this morning - hope I don’t contract anything.”
Although state emergency officials said they told San Francisco of the spill late Thursday night, Tony Winnicker, spokesman for the city’s Public Utilities Commission, said officials weren’t told about it until late Friday morning.
In November, the container ship Cosco Busan hit the Bay Bridge and spilled 53,000 gallons of fuel oil into the bay. The full extent of that spill wasn’t announced until several hours later, causing a delay in the cleanup. Thousands of birds died in the spill, and beaches were covered in sticky blobs of oil for days. More…
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