Asked about the permits and waivers, officials at the Department of the Interior and the Minerals Management Service, which regulates drilling, pointed to public statements by Interior Secretary Ken Salazar, reiterating that the agency had no intention of stopping all new oil and gas production in the gulf.
Department of the Interior officials said in a statement that the moratorium was meant only to halt permits for the drilling of new wells. It was not meant to stop permits for new work on existing drilling projects like the Deepwater Horizon.
But critics say the moratorium has been violated or too narrowly defined to prevent another disaster.
With crude oil still pouring into the gulf and washing up on beaches and in wetlands, President Obama is sending Mr. Salazar and Homeland Security Secretary Janet Napolitano back to the region on Monday.
In a toughly worded warning to BP on Sunday, Mr. Salazar said at a news conference outside the company’s headquarters in Houston, “If we find they’re not doing what they’re supposed to be doing, we’ll push them out of the way appropriately.”
Mr. Salazar’s position conflicted with one laid out several hours earlier, by the commandant of the United States Coast Guard, Adm. Thad W. Allen, who said that the oil conglomerate’s access to the mile-deep well site meant that the government could not take over the lead in efforts to stop the leak.
“They have the eyes and ears that are down there,” the admiral said on CNN’s “State of the Union” program. “They are necessarily the modality by which this is going to get solved.”
Since the explosion, federal regulators have been harshly criticized for giving BP’s Deepwater Horizon and hundreds of other drilling projects waivers from full environmental review and for failing to provide rigorous oversight of these projects.
In voicing his frustration with these regulators and vowing to change how they operate, Mr. Obama announced on May 14 a moratorium on drilling new wells and the granting of environmental waivers.
“It seems as if permits were too often issued based on little more than assurances of safety from the oil companies,” Mr. Obama said. “That cannot and will not happen anymore.”
“We’re also closing the loophole that has allowed some oil companies to bypass some critical environmental reviews,” he added in reference to the environmental waivers.
But records indicated that regulators continued granting the environmental waivers and permits for types of work like that occurring on the Deepwater Horizon.
In testifying before Congress on May 18, Mr. Salazar and officials from his agency said they recognized the problems with the waivers and they intended to try to rein them in. But Mr. Salazar also said that he was limited by a statutory requirement that he said obligated his agency to process drilling requests within 30 days after they have been submitted.
“That is what has driven a number of the categorical exclusions that have been given over time in the gulf,” he said.
But critics remained unsatisfied.
Shown the data indicating that waivers and permits were still being granted, Senator Benjamin L. Cardin, Democrat of Maryland, said he was “deeply troubled.”
“We were given the clear impression that these waivers and permits were not being granted,” said Mr. Cardin, who is a member of the Senate Environment and Public Works Committee, where Mr. Salazar testified last week. “I think the presumption should be that there should be stronger environmental reviews, not weaker.”
None of the projects that have recently been granted environmental waivers have started drilling.
However, these waivers have been especially troublesome to environmentalists because they were granted through a special legal provision that is supposed to be limited to projects that present minimal or no risk to the environment.
At least six of the drilling projects that have been given waivers in the past four weeks are for waters that are deeper — and therefore more difficult and dangerous — than where Deepwater Horizon was operating. While that rig, which was drilling at a depth just shy of 5,000 feet, was classified as a deep-water operation, many of the wells in the six projects are classified as “ultra” deep water, including four new wells at over 9,100 feet.
In explaining why they were still granting new permits for certain types of drilling on existing wells, Department of the Interior officials said some of the procedures being allowed are necessary for the safety of the existing wellbore.