The Obama administration on Friday unveiled its first major standards for oil companies that frack on federal lands, including beefed-up safety measures to protect groundwater, prompting industry complaints they will be a barrier to growth. The rules require energy companies to reinforce boreholes and otherwise prevent leakage and provide data on the cocktail of chemicals that helps extract crude oil and gas out of the ground. The rules will add transparency to the practice, long shrouded by companies reluctant to reveal “trade secrets.” Hydraulic fracturing, or fracking, a controversial process that involves pumping water, sand and chemicals into a well to extract oil or gas. Environmentalists say fracking poses health risks. Although only about 10 percent of fracking occurs on federal lands, the Obama administration is hoping the new rules will become a model for industry standards elsewhere, especially in states that do not have fracking […]