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d ' <br /> rq <br /> n <br /> N <br /> EDH <br /> U1 <br /> C <br /> tF <br /> X <br /> f'1 <br /> CHAPTER 22 <br /> a <br /> 2 <br /> Estimates far Hydrocarbon Vapor Emissions 2 <br /> Resulting from Service Station Remediations <br /> and Buried Gasoline-Contaminated Soils <br /> Paul C.,Tohiim.Ma"In B.Hertz,and Dallas L.Byers,Shell DmItiliiitent,N%csthallow <br /> Research Center, Houston, TX <br /> 1. INTRODUCTION <br /> Soils bwome contaminated at service stations as the result primarily of leaking <br /> underground storage tanks, leaking transport lines, or spills that occur during <br /> storage tank filing. Upon detection of a spill. a site investigation is conducted <br /> and a remediation plan is formulated While the specific remediauon plan for <br /> any site depends on the level of contamination, location of contaminated soil, <br /> sod stratigraphy.and other situ-specific factors,a typical service station remedt- <br /> ation win invoke soil excavation,pumping and treating ofeont minated ground- <br /> water and free-liquid residual gasoline. and in-situ treatment (soil venting or <br /> enhanced biodegradation) of the unsaturated zone Because some hydrocaibon <br /> vapors are released to ilio atmosphere during each stage,it is important to know <br /> the range of possible emission levels to order to evaluate the health risk that they W <br /> may pose to a nearby community <br /> This chapter is divided into three main sections In the first section models are n <br /> deteloped for oomputing conservative emissions estimates for each stage of a <br /> hypothetical service station cleanup.which oonsists of tank excavation and replace- <br /> ment, a pump-and-treat operation that removes contaminated groundarater and <br />