1. Information Session: Pall Life Sciences 1,4-dioxane contamination TOSC Program, SRSW and City of Ann Arbor March 24, 2004

2. TOSC Program  University-based program—addresses science and engineering related to pollution problems  National program, funded by U.S. EPA since 1994  Provide educational and technical assistance; directly address citizens concerns  Agreement with SRSW and City to provide services  Two goals: Shed light on extent of problem; and catalyze effective public involvement

3. Contributions of TOSC  Independent review of key community questions  Information on key concepts related to PLS dioxane problem  Provide review/analysis to assist both community members and regulatory agency (MDEQ)

4. Specific problem – Complex Solution  One pollutant of concern: 1,4-dioxane  Highly soluble, does not sorb to soils, moves with groundwater readily (one exposure pathway)  Very complex hydrogeologic setting, especially in vicinity of the Huron River  Very complex cleanup options, especially if done in-situ (below ground, thru injection)  If ex-situ, discharging water is an issue

5. TOSC Personnel on PLS Project  Dr. Susan Masten, Project Director, Professor, MSU  Dr. Larry Lemke, Hydrogeologist, Senior Lecturer, Wayne State  Kirk Riley, TOSC Program Manager  Scott Siple, Project Specialist, MSU  Todd Zynda, Project Specialist, MSU

6. Meeting Overview  Introduction to TOSC Program and goals of tonight’s meeting.  Overview of GSI/PLS process: Key points and status  Hydrogeology: Extent of plume? What do we know? What gaps exist? Can the plume be “captured?” (Dr. Larry Lemke, Wayne State University)  Treatment options: What is PLS proposing to remediate plume? What considerations are important with each of the treatment options? (Dr. Susan Masten, Michigan State University)  Question and answer session  Panel discussion (City, SRSW, County and TOSC)

7. Tonight’s meeting  Packets  Questions related speakers’ topics are welcome at any time  Please reserve comments for Q-A/comment section of agenda

8. Contact Information  Kirk Riley, TOSC Program Manager, Michigan State University (rileyki@egr.msu.edu)  Dr. Susan Masten, Professor of Environmental Engineering, MSU (masten@egr.msu.edu)  Dr. Larry Lemke, Senior Lecturer, Wayne State University (ldlemke@wayne.edu)  Roger Rayle, Associate Chair, Scio Residents for Safe Water, (734) 761-8932 (rogerr@e-mich.com)  Matthew Naud, Environmental Coordinator, City of Ann Arbor, (734) 997- 1596 (mnaud@ci.ann-arbor.mi.us TOSC Program Michigan State University East Lansing, MI 48824 (800) 490-3890