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2375 Grant Line Road <br /> April 28, 2009 <br /> page 2 <br /> Please proceed with preparation of a closure report for this site that includes the <br /> environmental assessment of the area near MW-10 and discussion of possible sources of <br /> ,the contamination reported in that boring/well, a calculation of contaminant mass remaining <br /> .at the site in both soil and groundwater, a model predicting how long it will be until the ? <br /> dissolved contaminant concentrations onsite reach water quality goals, a discussion of the <br /> potential vapor intrusion threat from the remaining contamination, and all other requirements <br /> listed in the Tri-Regional Guidelines Appendix A. The report is due for submittal to the EHD <br /> no later than July 3, 2009. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Sincerely, <br /> Lori Duncan, REHS Margare agorio, REH <br /> Registered Environmental Health Specialist Program Coordinator <br /> c: James Barton, CVRWQCB, 11020 Sun Center Drive #200, Rancho Cordova CA 95670 <br /> Tom Sparrowe, CRA, 5900 Hollis Street, Suite A, Emeryville, CA 94608 <br /> f <br />