IN THE MATTER OF:PROPOSED AMENDMENTS TOTIERED APPROACH TO CORRECTIVEACTION OBJECTIVES(35 Ill.
Answer 1: The principal document is U.S.
EPA’s OSWER Draft Guidance, Evaluating
the Vapor Intrusion to Indoor Air Pathwayfrom Groundwater and Soils, published in 2002.
Answer 3: The Johnson & Ettinger parameter values and their sources are set forth in
Appendix C, Table M.
Question 4: Which of the assumptions in the Johnson & Ettinger model have the highest
sensitivity in terms of the values proposed by the agency in its Tier 1 Table G?Answer 4: The most sensitive parameters are water-filled soil porosity and fraction ...
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