 The water level is particularly on the decline in Texas and New Mexico.Continued long-term use of the aquifer is "troublesome and in need of major reevaluation," according to the historian Paul H. Carlson, professor-emeritus from Texas Tech University in Lubbock.In 2008, TransCanada Corporation proposed the construction of the Keystone XL pipeline to carry oil from the Athabasca oil sands of Alberta to refineries near Houston, Texas.