[en] A break in Rainbow Pipeline's main line occurred in February 1993 north of Slave Lake, resulting in 2,500 cubic metres of light crude being spilled onto peat moss covered tundra. Oil recovery from this natural sorbent was almost impossible. After 21 days, only 650 cubic metres of free standing oil had been recovered. The boggy muskeg was causing problems and would cause even more when it began to thaw. With the weather window closing rapidly, the crew resorted to in situ burning. The oil soaked debris was piled in containment areas and burned in the air curtain incinerator owned by the Canadian Association of Petroleum Producers. When the burn was completed only some ashes remained with very negligible oil residue. 2 figs