Following a crude oil pipeline release at a pumping station in Northern British Columbia (Figure 1), Chemco was approched to provide a techno-economical evaluation and tentative supply of in situ remedial amendment including aerobic and anaerobic enhanced biodegradation It was reported that 4,000 liters of crude oil was spilled. Based on the size of the release area and the volume spilled, the starting concentrations were reported at an average of 23,800 mg/kg with maximum concentrations up to 53,200 mg/kg (Figure 2). Enhanced Bioremediation using both bioaugmentation and biostimulation was selected as the treatment method since in situ chemical oxidation could have cause issues on some the sensitive underground infrastructures present. The bioremediation process aims at accelerating the timeframe it would normally take for naturally occurring organisms to acclimatize and proliferate in the release area. At the time, all parties were notified that the exact timeframe and effectiveness was uncertain due to location, climate, season, etc., but the option was selected because of the relatively low cost and limited other options appliable. The petroleum hydrocarbon impacts covered a surface area of 24 m2 and extended 2 meters below surface (of the removed soil area) for a total volume 48 m3. Groundwater was approximately 3 meters below grade (mbg) and the soil consisted of fine to coarse sand. Due to the limited access, the option required that the amendments be applied to the surface and infiltrate into the soil.