Nexen Energy apologized Friday for a five-million-litre pipeline spill of bitumen, produced water and sand into muskeg at its Long Lake oilsands project near Fort McMurray. Here is a list of some other Alberta spills in recent years: March 2015: About 2.7 million litres of condensate used to dilute heavy oil was discovered near the muskeg's surface at Murphy Oil's heavy oil site, 80 kilometres northeast of Peace River.