"Staggering": 25,000 barrels found at toxic dump site in Pacific Ocean off Los Angeles coast
Marine scientists say they have found what they believe to be as many as 25,000 barrels that possibly contain DDT dumped off the Southern California coast near Catalina Island, where a massive underwater toxic waste site dating back to World War II has long been suspected.
The 27,345 "barrel-like" images were captured by researchers at the University of California San Diego's Scripps Institution of Oceanography. They mapped more than 36,000 acres of seafloor between Santa Catalina Island and the Los Angeles coast in a region previously found to contain high levels of the toxic chemical in sediments and in the ecosystem.
Historical shipping logs show that industrial companies in Southern California used the basin as a dumping ground until 1972, when the Marine Protection, Research and Sanctuaries Act, also known as the Ocean Dumping Act, was enacted.
Resting deep in the ocean, the exact location and extent of the dumping was not known until now.
The territory covered was "staggering," said Eric Terrill, chief scientist of the expedition and director of the Marine Physical Laboratory at Scripps Institution of Oceanography.
Underwater drones using sonar technology captured high-resolution images of barrels resting 3,000 feet below the surface all along the steep seafloor that was surveyed. They also were seen beyond the dumpsite limits.
"It really was a surprise to everybody who's worked with the data and who sailed at sea," he told reporters Monday.
The survey provides "a wide-area map" of the barrels, though it will be up to others to confirm through sediment sampling that the containers hold DDT, Terrill said. It's estimated between 350 and 700 tons of DDT were dumped in the area, 12 miles from Los Angeles, and 8 miles from Catalina Island.
The long-term impact on marine life and humans is still unknown, said Scripps chemical oceanographer and professor of geosciences Lihini Aluwihare, who in 2015 co-authored a study that found high amounts of DDT and other man-made chemicals in the blubber of bottlenose dolphins that died of natural causes.
"These results also raise questions about the continued exposure and potential impacts on marine mammal health, especially in light of how DDT has been shown to have multi-generational impacts in humans," said Aluwhihare, who was not part of the survey expedition.
Diana Aga, a chemistry professor at University at Buffalo who is not affiliated with the study, said the findings were shocking if the barrels are proven to contain the toxic chemical. "That's a lot of DDT at the bottom of the ocean," she said.
If the barrels haven't leaked, they could be moved to a place where disposal is safer, Aga said. If they leaked, scientists could take samples from the water, sediment and other marine life to gauge the damage.
Scientists conducted the survey from March 10-24 following a Los Angeles Times report last year about evidence that DDT was dumped into the ocean.
"Unfortunately, the basin offshore Los Angeles had been a dumping ground for industrial waste for several decades, beginning in the 1930s. We found an extensive debris field in the wide area survey," Terrill said.
Scientists started the search where University of California Santa Barbara professor David Valentine had discovered concentrated accumulations of DDT in the sediments and spotted 60 barrels about a decade ago.
"It's a feeling of — how does nobody know about this? How is it that we are the first people to ever see this with our eyes?" Valentine told CBS Los Angeles earlier this month.
Valentine had published his new findings last year, stunning residents and state leaders. But the news may help biologists understand the high levels of DDT in California's sea lions and their startling rate of cancer, which they say is rare in wild animals.
"About 25% of adults, subadults, have cancer and that is an extremely alarming number," Marine Mammal Center veterinarian Dr. Cara Field said. "Given the very severely high rate and how abnormal it is, it is really important that we understand what is driving this disease in these animals."
The Los Angeles Times reviewed shipping logs from a disposal company supporting Montrose Chemical Corp. of California, a DDT-producing company. The logs showed 2,000 barrels of DDT-laced sludge were dumped in the deep ocean each month from 1947 to 1961 off Catalina, and other companies also dumped there until 1972.
Scripps researchers say they hope their survey will support clean-up efforts.
The expedition on the Sally Ride research vessel included a team of 31 scientists, engineers, and crew conducting 24-hour operations and two autonomous underwater vehicles.
