TransCanada's Gulf Coast pipeline project is closer to reality under a revised plan aimed at heading off ecological concerns. The U.S. Environmental Protection Agency and the U.S. Army Corps of Engineers took issue with several wetland crossings along the 480-mile route between Cushing, Okla., and Nederland, Texas, when they were proposed as part of the larger Keystone XL project last year. Instead of laying pipe over streams and wetlands, TransCanada now plans to go under them.