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.

Does notcontainTse oy ~ Title: study of{IAccomulation in Carp Commissioned by: DuPont KK 1-8-1 Shimo-meguro, Meguro-ku, Tokyo 153-0064 Testing Facility: Kurume Laboratory Chemicals Evaluation and Research Institute, Japan (CERI) 19-14 Chuo-machi, Kurume-shi, Fukuoka Prefecture. 830-0023 Purposoef Study: To obtain findings on the accumulation of(NDin carp.

AR226-2187 EXPOSURE EVALUATION FOR NEW PROCESS AT FAYETTEVILLE SITE Prepared by DuPont Engineering Technology Debbie Mulrooney Cathie Barton August 20, 2001 Revised February 20, 2002 EDD0068699 TABLE OF CONTENTS Executive Summary 1. introduction 2.

AR226-2187 EXPOSURE EVALUATION FOR NEW PROCESS AT FAYETTEVILLE SITE Prepared by DuPont Engineering Technology Debbie Mulrooney Cathie Barton August 20,2001 Revised February 20, 2002 EDD0068699 TABLE OF CONTENTS i Executive Summary 1.

Tonnage: In 2022, DuPont calculated it introduced less than 60 tonnes of PTFE and 8 tonnes of PFPE and fluorosilicones combined due to commercial industrial sales of PFAS containing lubricants.

In this study, Solvay - a producer of PVDF - partnered with DuPont to study the ability to recover and recycle PVDF from "end of life" ultrafiltration membranes used in drinking water treatment plants.

The internal standards used were a dual labeled PFOS where two *0 molecules were included in the sulfonate group (internal standard, >99% purity, synthesized by Research Triangle Institute, Research Triangle Park, NC) and a dual labeled PFOA molecule, where the carboxyl and alpha carbons were labeled with C stable isotope (greater than 97%, provided by DuPont, Wilmington, DE).

Kaiser DuPont Central Research September 13,14, 2004 w ' ' w Why not model, rather than mea Because these compounds are not well-beh predictable.

PFOA Levels (ppb) 1.7-4.3 Location Little Hocking, Ohio 0.4-3.9 Lbeck, WV 0.25-0.37 Tuppers Plains, Ohio 0.08-0.13 Belpre, Ohio 0.06-0.1 Mason, WV 0.06-0.07 Pomeroy, Ohio 0.165 Blennerhassett 1.0-5.0 Dupont, W ashington Works 1.75-1.87 GE Plastic 0.05-8.6 68 Private W ells W VA & Ohio Abbreviations: N'A Not Applicable H o u s e h o ld s 4200 3700 4800 6000 4200 1000 71 N/A N/A 68 3 Table B.

Attain-ooGI BIOACCUMULATION (ANALYTICAL ONLY) TEST SUBSTANCE______________ Identity: Perfluorooctanesulfonate; may also be referred to as PFOS or FC-95. (1-Octanesulfonicadd, 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8heptadecafluoro-, potassium salt, CAS # 2795-39-3) Remarks: The test substance is a white powder.

The internal standards used were adual labeled PFOS where two '*0 molecules were included in the sulfonate group (internal standard, >99% purity, synthesized by Research Triangle Institute, Research Triangle Park, NC) and a dual labeled PFOA molecule, where the carboxyl and alpha carbons were labeled with "C stable isotope (greater than 97%, provided by DuPont, `Wilmington, DE).

EXPOSURE EVALUATION FOR NEW PROCESS AT FAYETTEVILLE SITE Prepared by DuPont Engineering Technology Debbie Mulrooney Cathie Barton August 20, 2001 Revised February 20, 2002 TABLE OF CONTENTS Executive Summary 1.

The vapor phase scavenging coefficients used were based on calculations by DuPont which were submitted under the Consent Order.

8EHQ-09-16436I 89090000405 September 16,2009 - , ; V i` '3 0 09 SEP 18 6** 09 DuPont Haskell Global Centers for Health and Environmental Sciences 1090 Elkton Road, P.O.

DuPont Chemical Solutions Enterprise Page 1 of 8 Final Draft Guidance Document Telomer Research Program (TRP) Best Analytical Practices for TRP Studies Including Guidance on Method Validation General Guidance Special care must be used in sampling and analysis to avoid problems with accuracy and precision of analyses, especially when determining non-volatile fluorinated compounds at ppb levels.