TransCanada is digging up the original Keystone pipeline in 10 spots, including three in Nebraska, to look at anomalies in the line. A company spokesperson says the digs were part of a federally mandated audit, one of 55 already conducted, to determine if the pipeline had grown beyond limits established by the Pipeline and Hazardous Materials Safety Administration. The proposed Keystone XL pipeline — a 1,000-mile extension to the original line that would cross through the Sandhills and the Ogallala Aquifer — is currently awaiting final approval by the U.S. State Department. Twenty-eight members of Congress wrote to Secretary of State Hillary Clinton on Dec. 3, urging her to take a closer look at the environmental impact of the pipeline. A decision could come early next year.