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Washington (CNN) — The “top kill” method intended to stop the runaway flow of oil spewing into the Gulf of Mexico probably will be tried early next week, BP Chief Operating Officer Doug Suttles said Friday. In the procedure, thick, viscous fluid twice the density of water will be pumped at a high rate into the site of the leak to stop the flow so that it can then be sealed with cement, Suttles said. “Our best estimate is probably Tuesday,” he said, noting that the operation has never been tried in such deep water. Also on Friday, a top scientist told a congressional panel that the damaging effects of the massive Gulf spill will be felt all the way to Europe and the Arctic. “This is not just a regional issue for the wildlife,” said Carl Safina, the president of the Blue Ocean Institute. Safina, who recently returned from the Gulf Coast region, presented several photographs, including one of an oil-covered bird. “There will be a nest empty in Newfoundland,” Safina said, noting common migratory patterns. Safina warned that multiple forms of marine life in the Atlantic Ocean “come into the Gulf to breed.” Safina's briefing to representatives of the House Energy and Commerce Committee was scheduled as part of an ongoing effort to draw on a broad range of expertise for cleanup efforts. “We have to use science to find solutions,” said Rep. Ed Markey, D-Massachusetts. Markey has been strongly critical of the current cleanup effort, calling it ineffective. Meanwhile, another congressman, concerned about people who are working to clean up the spill, has asked the White House to set up temporary health care centers along the Gulf Coast to serve volunteers and workers. Rep. Charlie Melancon, D-Louisiana, envisions such clinics as providing “medical checkups to people who have come in contact with the oil and assist in monitoring the health effects of the oil leak on south Louisianians.” He sent the request Wednesday to Health and Human Services Secretary Kathleen Sebelius. There was no immediate response from the agency. “Many residents and volunteers are being exposed to hazardous materials on a daily basis, and some will have to travel hours to get treatment at the nearest health care facility. It is imperative that temporary health care clinics be established to provide basic health care services in this geographic area,” he said. He has also asked Sebelius to “appoint a health care coordinator to oversee and streamline the health care response.” Melancon emphasized that BP should be responsible for such health care services in his state. The energy giant was operating the oil rig that exploded and sank in April, triggering the spill. On Thursday, BP acknowledged that the underwater gusher is bigger than estimated to date, as new video showed a cloud of crude billowing around its undersea siphon. Company spokesman Mark Proegler said Thursday that the siphon is now drawing about 5,000 barrels (210,000 gallons) per day up to a ship on the surface of the Gulf — as much as government and company officials had estimated the spill was pouring into the Gulf every day for a month. Proegler declined to estimate how much more oil was escaping. BP America Chairman Lamar McKay said Wednesday that the figure used by the oil spill response team had a degree of “uncertainty” built into it. But figures by independent researchers have run up to many times higher: Steve Wereley, a professor of mechanical engineering at Purdue University, told CNN's “American Morning” that the spill could be as big as 20,000 to 100,000 barrels a day. And members of Congress released video from the company that showed much more oil pouring out of the damaged well than the siphon was capturing. Rep. Ed Markey, who leads a House subcommittee investigating the disaster, told reporters, “I think now we are beginning to understand that we cannot trust BP.” “People do not trust the experts any longer,” said Markey, D-Massachusetts. “BP has lost all credibility. Now, the decisions will have to be made by others, because it is clear that they have been hiding the actual consequences of this spill.” Meanwhile, the Coast Guard announced the creation of a federal Flow Rate Technical Group to assess the flow rate from the well. Coast Guard Capt. Ron LaBrec said that Adm. Thad Allen would oversee the team, which will include members from the Coast Guard, the Minerals Management Service, the National Oceanic and Atmospheric Administration, the Department of Energy, the U.S. Geological Society and others from the science community and academia. The peer-reviewed team, which has already begun its work, is to determine the flow rate from the beginning of the incident to the present, LaBrec said. The Obama administration announced Thursday that it has ordered BP to release all data related to the massive spill, including environmental sampling analyses, internal investigation reports and details of the cleanup effort. In a letter to BP Group CEO Tony Hayward, Homeland Security Secretary Janet Napolitano and Environmental Protection Agency Administrator Lisa Jackson told BP to post that information on a website and update it daily. “The public and the United States government are entitled to nothing less than complete transparency in this matter,” they concluded. The spill began with an April 20 explosion and fire that sank the drill rig Deepwater Horizon two days later. Eleven workers were lost with the rig, which was owned by drilling contractor Transocean and hired by BP. The resulting slick now threatens the coastal marshes of southeastern Louisiana, where brown, syrupy oil made it past protective booms and into the wetlands near the mouth of the Mississippi River on Wednesday. Over the weekend, BP inserted a piece of pipe into the larger of the two leak points and began drawing oil from the undersea gusher, located about a mile underwater, up to a ship on the surface. It also has been laying booms out along barrier islands and spraying hundreds of thousands of gallons of chemical dispersants on the surface and near the sources of the leak. But that element of the response came under new fire as well on Thursday, as the EPA ordered BP to find a less toxic chemical to use to break up the oil. The EPA gave the company a day to pick a new substance and three days to start using it instead of the current dispersant, known as Corexit 9500. The chemical has been rated more toxic and less effective than many others on the list of 18 EPA-approved dispersants, according to testimony at a congressional hearing Wednesday. “Because of its use in unprecedented volumes and because much is unknown about the underwater use of dispersants, EPA wants to ensure BP is using the least toxic product authorized for use,” the agency said in a statement announcing the order. “We reserve the right to discontinue the use of this dispersant method if any negative impacts on the environment outweigh the benefits.” added by: ignignokt