ABSTRACT
Soils become contaminated at service stations as the result primarily of leaking underground storage tanks, leaking transport lines, or spills that occur during storage tank filling. Upon detection of a spill, a site investigation is conducted and a remediation plan is formulated. While the specific remediation plan for any site depends on the level of contamination, location of contaminated soil, soil stratigraphy, and other site-specific factors, a typical service station remediation will involve soil excavation, pumping and treating of contaminated groundwater and free-liquid residual gasoline, and in-situ treatment of the unsaturated zone. Because some hydrocarbon vapors are released to the atmosphere during each stage, it is important to know the range of possible emission levels in order to evaluate the health risk that they may pose to a nearby community. In the following analysis, models are presented for computing conservative estimates for emissions resulting from processes associated with typical service station remediations.
