Toeroek supports Region 8 in developing a conceptual site model (CSM) of an oil refinery specifically evaluating the available data collected over many years to refine the understanding of the hydrogeologic conditions, the extent and migration of contamination, and the effectiveness of the interim measures used to mitigate its impact to the nearby town and creek. The CSM report details the historical data, reviews the existing analysis, evaluates potential data gaps, and makes recommendations in addition to developing a graphical 3-D CSM representation of the site.