Grist: Property owners who watched with disgust and fear as TransCanada contractors ripped up their land to lay the southern leg of the Keystone XL pipeline are being treated to a repeat performance. The pipeline isnt even in service yet, but already TransCanada is digging up stretches of faulty piping and replacing them, raising fresh safety fears. The pipeline is intended to link up with the Keystone XL northern leg which is still waiting for approval from the Obama administration and then carry...