Pipeline opponents warn of disruption of farms and ranches during construction, and point to damage to water mains and sewage lines sustained during construction of an Enbridge crude oil pipeline in Michigan. A report by the Cornell University Global Labor Institute noted of the 2010 Enbridge Tar Oil Spill along the Kalamazoo River in Michigan: "The experience of Kalamazoo residents and businesses provides an insight into some of the ways a community can be affected by a tar sands pipeline spill. Pipeline spills are not just an environmental concern. Pipeline spills can also result in significant economic and employment costs, although the systematic tracking of the social, health, and economic impacts of pipeline spills is not required by law. Leaks and spills from Keystone XL and other tar sands and conventional crude pipelines could put existing jobs at risk.."