The site is an operating chemical manufacturing facility across the Mississippi river from St. Louis. The area of concern held a 2-million-gallon benzene tank that had leaked over decades releasing 100,000’s of pounds of benzene into the underlying silty-sandy soils, with clay layering. Numerous investigations of the impacts to the underlying soils and groundwater at the site have been performed; a substantial amount of data is available because of the investigations. Due to the volatility of benzene and the permeable nature of the majority of the underlying soils above the groundwater table, soil vapor extraction (SVE) is the selected remedial technology for the site. Soil vapor extraction involves inducing air flow in the underlying soils to cause volatilization of the benzene and removal of the vapors to an above ground treatment system.