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Toxicological Summary PFOS Dietary Chronic Definitive Reproductive Study: Mallard Test Substance: Perfluorooctanesulfonate (PFOS) Structure: 1-Octanesulfonic acid, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-heptadecafluoro, potassium salt.

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PERSONAL AND CONFIDENTIAL AR226-1981 O.

AR226-1995 CC: D.

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TestResults AR226-2119 fite:///C|/WIND0WS/TEMP/C-8 Z 2-26-73 thim8-12-81.htm TestResults Sam ple Date Range C oncentration Range A ction Level Industrial Hygiene 2/26/73 100% 8/12/81 Sample Dt Sample # D uration Type Employee Name Fera BTO : LOC : 04 POWER & SERVICES 074 INCINERATOR AREA - GENERAL 4/15/81 52165 Z 4/20/81 52166 Z 4/20/81 52167 Z C hem ical Cone U nit Percent C-8 0.0005 PPM 0.0% C-8 0.0011 PPM 0.0% C-8 0.0002 PPM 0.0% BTO : LOC : 07 TECHNICAL 406 TFE-FEP-MELT INDEXER-ON BENCH 10/23/80 57333 Z 10/28/80 57334 Z 10/31/80 57335 Z C-8 <0.0001 PPM 0.0% C-B 0.0011 PPM 0.0% C-8 0.0008 PPM 0.0% BTO : LOC : 07 TECHNICAL 411 BLDG. 163 - LAB GENERAL AREA 4/10/81 47508 Z C-8 <0.0001 PPM 0.0% A3P006235 BTO ; LOC : 07 TECHNICAL 435 BLDG 212-CHECK VISUAL CONTAMINATION CUBES 2/25/81 60866 Z C-8 0.0003 PPM 0.0% BTO : LOC : 07 TECHNICAL 436 BLDG 212-FEP-MELT INDEXER-ON BENCH 2/25/81 52683 Z lo f 51 C-8 O.OCi 5 PPM 0.0% 8/9/2001 3:52 PM E ID 139477 TestResults file:///C|/WIND0WS/TEMP/C-8 Z 2-26-73 thru 8-12-81.htm 2/25/81 52684.

AR226-2255 Chris E Shoop 02/08/2002 03:23 PM To: Debbie J Mulrooney/AE/DuPont@DuPont cc: Robert F Pinchot/DEV/AE/DuPont@DuPont, Stephen J Gissy/AE/DuPont@ DuPont, Roger J Zipfel/AE/DuPont@DuPont S ub ject Re: C8 2001 Emissions O Debbie, I have calculated emissions for 2001 but the emitted amounts are not broken out by emission point.

1 ' AR226-2 273 s GIST meeting notes May 15,2002 Minnies from the C-8 DuPont meeting May 15,2002 The meeting began at approximately 10:20 am.

AR226-2328 J Bari Ruiter 04/08/2003 07:34 AM To: cc: Subject: Maria S Angelo/AE/DuPont@ DuPont, Richard S Vickery/AE/DuPorrt@DuPont, Thomas R Morgan/AE/DuPont@DuPont, Mary A Kaiser/AE/DuPont@ DuPont Stephen W Constable/ABDuPont@ DuPont, Catherine A Barton/AE/DuPont@DuPont Robert A Reich/AE/DuPont@ DuPont ' Chambers W orks: Effluent and River Draft Sampling Plan M aria, Rick and Tom 1upgraded the Phase I sam pling plan fo r the effluent and rive r based on your comments.

AR226-2528 TOXICOLOGY LIMITS - TLV - AEL - CEGA - CEGw uf/n3 100 10 0,3 - fife 5,6 0.56 0.0015 1.0 CALCULATED DOSE - AEL - CE6 100 ug/day 0 ug/day RJZO10003 / EID079258

RECYCLEO \O AR226-2622 Draft: Prepared at the Request o f Council AR226-2622 This report was not issued as shown, but was incorporated into a larger Chambers Works report under the consent order Section 1 Chambers Works ISC3 Modeling Methodology and Results Emission Source Information The ISC3 model was used to calculate ambient ground-level air concentrations for emissions o f C8 from the Chambers Works site.

AR226-2766 FOR D PONT USE ONLY E.

E.