This report provides a spill response model and a user's manual for the Athabasca River. The model provides the capability for downstream sites from a spill to develop a prediction of the likely time when the spilt material is likely to come into contact with a water intake point. The model affords a predictive capability to users not previously available. It affords the opportunity for users to be warned of the onset of likely contamination thereby presenting an opportunity to take corrective action to avoid use of contaminated drinking water supplies. The model does not predict the interval of time when contamination is no longer an issue