Washington - In the next few weeks, the Bush administration is expected to relax environmental-protection rules on power plants near national parks, uranium mining near the Grand Canyon and more mountaintop-removal coal mining in Appalachia.

    The administration is widely expected to try to get some of the rules into final form by the week before Thanksgiving because, in some cases, there's a 60-day delay before new regulations take effect. And once the rules are in place, undoing them generally would be a more time-consuming job for the next Congress and administration.

    The regulations already have had periods of public comment, and no further comments are being taken. The administration has proposed the rules and final approval is considered likely.

    It's common for administrations to issue a spate of regulations just before leaving office. The Bush administration's changes are in keeping with President Bush's overall support of deregulation.

    Here's a look at some changes that are likely to go into effect before the inauguration.

    Grand Canyon

    Higher prices for uranium, driven by expanded interest in nuclear power, have resulted in thousands of mining claims being filed on land within three miles of the Grand Canyon.

    The House of Representatives and Senate natural resources committees have the authority under the Federal Land Policy and Management Act to order emergency withdrawals of federal land from future mining claims for three years, while Congress decides whether a permanent ban is needed. The House committee issued such a withdrawal order in June for about 1 million acres near the Grand Canyon, including the land the claims were filed on.

    Now the Department of Interior has proposed scrapping its own rule that puts such orders from the congressional committees into practice.

    The Interior Department could decide to use its own power to halt new claims, but it doesn't see any emergency that would prompt such action, department spokesman Chris Paolino said. The department would require environmental impact studies before it approved any mining on the claims, he added.

    One of the main hazards from uranium mining is seepage from tailings piles that poisons water. A report for the Arizona Department of Game and Fish said people would be at risk if they ingested radium-226, arsenic and other hazardous substances from water and tainted fish.

    Environmental groups say the government must consider the possible danger of uranium leaching into the Colorado River, a source of drinking water for Phoenix, Las Vegas and Los Angeles. Arizona Gov. Janet Napolitano in March urged Interior Secretary Dirk Kempthorne to halt new claims and order a study of uranium mining near the canyon.

    Mountaintop-Removal Coal Mining

    Another proposed rule change from the Department of Interior would change rules on dumping the earth removed for mining into nearby streams.

    The current rule, dating from the Reagan administration, says that no surface mining may occur within 100 feet of a stream unless there'd be no harm to water quality or quantity. The rule change essentially would eliminate the buffer by allowing the government to grant waivers so that mining companies can dump the rubble from mountaintops into valleys, burying streams.

    The new rule would let companies explain why they can't avoid dumping into streams and how they intend to minimize harm. A September report on the proposal by the department's Office of Surface Mining said that environmental concerns would be taken into account "to the extent possible, using the best technology currently available."

    The government and mining companies have been ignoring the buffer since the 1990s, said Joan Mulhern, an attorney with Earthjustice, a nonprofit law firm for environmental protection.

    Before the rule can be changed, however, the Department of Interior must get written approval from Environmental Protection Agency Administrator Stephen Johnson.

    "In order to concur, the EPA would have to find that the activities authorized by the rule would not violate water-quality standards, and all the evidence is to the contrary," Mulhern said.

    Air Pollution

    Two rule changes would apply to electric power plants and other stationary sources of air pollution.

    The first mainly concerns older power plants. Under the Clean Air Act, plants that are updated must install pollution-control technology if they'll produce more emissions. The rule change would allow plants to measure emissions on an hourly basis, rather than their total yearly output. This way, plants could run for more hours and increase overall emissions without exceeding the threshold that would require additional pollution controls.

    The other change would make it easier for companies to build polluting facilities near national parks and wilderness areas. It also would change the way that companies must measure the impact of their pollution.

    Endangered Species

    The Endangered Species Act prohibits any federal actions that would jeopardize the existence of a listed species or "adversely modify" critical habitats. The 1973 law has helped save species such as the bald eagle from extinction.

    Bush administration officials have argued that the act can't be used to protect animals and habitats from climate change by regulating specific sources of greenhouse gas emissions.

    A proposed rule change would allow federal agencies to decide for themselves whether timber sales, new dams or other projects harm wildlife protected under the act. In many cases, they'd no longer have to consult the agencies that are charged with administering the Endangered Species Act, the Fish and Wildlife Service and the National Marine Fisheries Service.

    Others

    Among the rule changes and plans that might become final are commercial oil-shale leasing, a new rule that would allow loaded, concealed weapons in some national parks, and oil and gas leasing on wild public lands in West Virginia and Utah.

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