Toxicological Summary pros Dietary Acute Mallard Study 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, CAS# 2795-39-3 Remarks: The test substance is a white powder (3M lot #217).

A R 2 2 6 -2 0 6 8 VW SAFETY, HEALTH AND ENVIRONMENTAL C8 AMMONIUM PERFLUORO-OCTANOATE FC--1 43 ANIONIC FLUOROCHEMICAL SURFACTANT MGF by 3M COMPANY v -5 o DuPONT AEL: 0 .01 m g /M 3 (0 .5 6 ppb, 8 hr TWA) o IRRITANT via INHALATION.

AR226-2185 EXPOSURE EVALUATION FOR NEW PROCESS AT FAYETTEVILLE SITE Prepared by DuPont Engineering Technology Debbie Mulrooney Cathie Barton August 20, 2001 EID293489 TABLE OF CONTENTS Executive Summary 1.

AR226-2246 Robert F Pinchot 01/15/2002 03:27 PM ' To: Bernard J Reilly/AE/DuPont@DuPont ccz Subject: Model Results- Privileged Communication See attached fo r the m odeling results for the cistern locations.

AR226-2360 E L du Pont de Nemours and Company W ashington W orks Halb P.O.

AR226-2405 INTEROFFICE MEMORANDUM Date: From: Dept: Tel No: 30--Nov--1983 01:36pm ANTHONY J.

AR226-2459 From: Rik A Brandenburg on 05/26/99 09:14 AM CED To: Roger J Zipfel/AE/DuPont@DuPont cc: Seiichi Tanaka/PO/DuPont@DuPont Subject: Re: C-8 in drinking water | | Roger, W e have no data for c-8 in drinking water and a lot of data on C-8 in ground water.

AR226-2474 To: Ton RoelenyEUR/DuPont@>DuPont, David M Rurak/AE/DuPont@DuPont, Katsunosuke Kitagaw a/PO /D uPont@ D uPont cc: Frenk Hulsebosch/EUR/DuPont@DuPont, Oscar T Garza/AE/DuPont@DuPont, Roger J ZipfeI/AE/DuPont@DuPont, Toni S Hess/HO/DuPont@DuPont, Paul K Mathur/CL/DuPont@DuPont, Patrick E Lindner/AE/DuPont@DuPont, Michael E McCord/AE/DuPont@DuPont Subject: TEST M ATRIX FOR C-8 FROM DIFFERENT SOURCES Ton, Dave and Kitagawa-san, Attached is a chart summarizing the tests performed (or successfully used) for C-8 from various sources.

AR226-2517 Mark E Reeder 05/21/2002 09:20 A M To: Michael G McClusky/AE/DuPont@DuPont cc: Ta-Wel Fu/SE/DuPont@ DuPont Subject: Water Samples The C-8 results on the float tank samples you submitted are listed below.

AR226-2553 To: Andrew S Hartten/AE/DuPont@DuPont Co: Subject: request for Information on perfluorochemicals can you make a m eeting this afternoon at 3:15 at chestnut run 711 . . . . . .

dODIIfe DuPont Engineering M y 22,2002 AR226-2590 DuPont EngiitiBring Bariev Mill P is - Bldg, V Lancaster Pike & Rte. 14) Wilmington, D E 138 Mr.

AR226-2626 RECYCLED CVL PROJECT SRCNAME SAMPLING 7/04 CVL 001-EFF SAMPLING 7/04 CVL 602-EFF SAMPLING 7/04 CVL DB-2 SAMPLING 7/04 CVL DB-3 SAMPLING 7/04 CVL PW-4 SAMPLING 7/04 CVL PW-5 SAMPLING 7/04 CVL PW-6 SAMPLING 7/04 CVL PW-6 SAMPLING 8/04 - CVL EHWC-AT SAMPLING 8/04 - CVL EHWC-AT SAMPLING 8/04 - CVL EHWC-BT SAMPLING 8/04 - CVL EHWC-W3 SAMPLING 8/04 - CVL EHWC-W4 SAMPLING 8/04 - CVL EHWC-W5 SAMPLING 8/04 - CVL EHWC-W6 SAMPLING 8/04 - CVL FBLK-1 THEME Surface Water Surface Water Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Drinking Water Drinking Water Drinking Water Drinking Water Drinking Water Drinking Water Drinking Water Blank Water DATESMPL SMPLT 7/8/2004 FS 7/8/2004 FS 7/8/2004 FS 7/8/2004 FS 7/8/2004 FS 7/8/2004 FS 7/8/2004 DUP 7/8/2004 FS 8/30/2004 DUP 8/30/2004 FS 8/30/2004 FS 8/30/2004 FS 8/30/2004 FS 8/30/2004 FS 8/30/2004 FS 8/30/2004 FB SAMPLE_NUMBER CVL-W-001-EFF CVL-W-602-EFF CVL-G-DB-2 CVL-G-DB-3 CVL-G-PW-4 CVL-G-PW-5 CVL-G-PW-6-DUP CVL-G-PW-6 CVL-D-EHWC-AT-DUP CVL-D-EHWC-AT CVL-D-EHWC-BT CVL-D-EHWC-W3 CVL-D-EHWC-W4 CVL-D-EHW C-W 5 CVL-D-EHWC-W6 CVL-K-FBLK-1 TOP BOTTOM 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C 8 results Envista 111104.xls Page 1 FILTERED 0T OT 0T OT 0T OT 0T 0T 0T 0T 0T 0T 0T 0T 0T 0T CASNO 3825261 3825261 3825261 3825261 3825261 3825261 3825261 3825261 3825261 3825261 3825261 3825261 3825261 3825261 3825261 3825261 ANALYTE FC-143 FC-143 FC-143 FC-143 FC-143 FC-143 FC-143 FC-143 FC-143 FC-143 FC-143 FC-143 FC-143 FC-143 FC-143 FC-143 RsltPost 6240 14800 <10 489 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 RsItVal UNITS 6240 NG/L 14800 NG/L 5 NG/L 489 NG/L 5 NG/L 5 NG/L 5 NG/L 5 NG/L 5 NG/L 5 NG/L 5 NG/L 5 NG/L 5 NG/L 5 NG/L 5 NG/L 5 NG/L Hit LAB_ANALYTE 1 FC-143 1 FC-143 0 FC-143 1 FC-143 0 FC-143 0 FC-143 0 FC-143 0 FC-143 0 FC-143 0 FC-143 0 FC-143 0 FC-143 0 FC-143 0 FC-143 0 FC-143 0 FC-143 QUALJEPA AR226-2626 QUALJNHOUSE REVIEW METHODNO 01M-008-046 01M-008-046 01M-008-046 01 M-008-046 01 M-008-046 01M-008-046 01 M-008-046 01 M-008-046 01 M-008-046 01 M-008-046 01M-008-046 01 M-008-046 01 M-008-046 01 M-008-046 01 M-008-046 01M-008-046 PREPMTHD NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS PREPREP NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS C8 results Envista 111104.xls CVL LAB_NUMBER L0002858-8 L0002858-7 L0002858-1 L0002858-2 L0002858-3 L0002858-4 L0002858-6 L0002858-5 L0003262-3 L0003262-1 L0003262-2 L0003262-4 L0003262-5 L0003262-6 L0003262-7 L0003262-8 RSLTMOD < < < < < < < < < < < < < RESULT 6240 14800 10 489 10 10 10 10 10 10 10 10 10 10 10 10 UNIT NG/L NG/L NG/L NG/L NG/L NG/L NG/L NG/L NG/L NG/L NG/L NG/L NG/L NG/L NG/L NG/L MDL 100 1000 10 10 10 10 10 10 10 10 10 10 10 10 10 10 PQL 500 5000 50 50 50 50 50 50 50 50 50 50 50 50 50 50 DUPNO Page 2

# AR226-2834 Material TestedT Haskell Laboratory f f"0"" and cn>Pany y ior Toxicology and Industrial, Medicine HASKELL LABORATORY REPORT NO. 162-73 ~ ' Material Submitted by; department, tProcedure--* TJ-huoG t,,sii.t material ao to young adult cha m , ai* as a 8wpenion in ACUTE_ORAL_TEST ' -- ma 6 rats in sin8le doses' Survi- - 0- - 0lsac(^ f ?

Author John W.

AR226-2927 FOR DUPONT USE ONLY Subchronic Inhalation Toxicity of Haskell Laboratory Report No. 182-85 E.