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BACK TO MAIN CEntrtz Analytical Laboratories, Inc. 3048 Research Drive State College, PA 16801 www.centrelab.com (814) 231-8032 Fax: (814) 231-1253 or (814) 231-1580 Analytical Report Fluorochemical Characterization of Drinking Water Samples Port St.

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AR226-2630 18 AR226-2630 DuPont Modeling Methodology and Results Dordrecht Site June 2003 About the Model I Industrial Source Complex Short Term 3 (ISCST3) I Sold/used globally, including in The Netherlands http://www.phoenix-r.co.jp/products/products.htm I Input I Stack height, diameter I Flowrate, temperature I Mass of pollutant (mass per time) I Local meteorological data (Rotterdam, 1996 - 2000) I Output I Ambient air concentrations in ug/m3 I Max values and locations outside the property line Prevailing wind Facility Ambient annual ground level concentration in ug/m3 Model Calculations I Ambient air concentrations based on Gaussian Equation I Concentration a function of a vertical term and a dispersion term I Vertical term based on stack height, receptor elevation, plume rise, mixing I Dispersion parameters describe distribution of pollutant in lateral and vertical Dordrecht Plant Site Dordrecht Modeling Inputs Stack Parameters PTFE Stack Height (m) 20.95 Stack Diam.

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AR226- 3259 441 TRADE SECRET #R226 - 3257 Dupont 11410 Study Title H-25434: Influence on Growth and Growth Rateofthe Green `Alga Selenastrum capricornutum LaboratoryProject ID: DuPont-11410 AUTHOR: Terry Lee Sloman, B.S

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