Resumen del autor, extraído del trabajo. Starting in the fall of 1998, Millennium EMS Solutions Ltd. undertook a co-compost remediation program on behalf of Gulf Canada Resources Limited involving oil contaminated soil at a pipeline break located near Gilby, Alberta. Approximately 1100m3 of heavy clay textured, hydrocarbon contaminated soil (5,000 to 6,000 ug/g TPH) was windrowed, treated with soil amendments (manure, fertilizer and wood waste), windrow turned two times and left to digest over the cold winter months. In early spring, the windrows were turned two more times. The results of the soil sampling and analysis completed 210 days after initiation show the soil to have been remediated to below Alberta Tier 1 cleanup criteria (1000 ug/g). Toxicological tests for aquatic and terrestrial systems have been successfully conducted to confirm the clean levels of the remediated soil. The co-composting remediation of the additional 2000m3 of hydrocarbon contaminated soil commenced in July, 1999. The results from this phase have not available when this paper was prepared but are expected to be similar. They are expected to be presented at the World Petroleum Congress in June, 2000.