Sarnia was chosen for several reasons. Most importantly, of course, it is the terminus of Interprovincial Pipelines’ main lines. The city itself is a big part of central Canada’s petroleum market. Near the 1857 Oil Springs discovery, Sarnia became a refining centre during Ontario’s 19th-century oil boom and a petrochemical centre during World War II. Sarnia has underground salt formations like those at Fort Saskatchewan. Caverns washed into those formations were used to receive NGL from IPL, and to store specification grade products to meet seasonal demand.