Barium TBS did not produce irritation (DuPont, 1988b).

The revised plan outlines DuPont's technical approach to determine the horizontal and vertical extent ofC-8 in ground water and soil in the vicinity of test well TW-4.

(See Exhibit B) Although there was no mention or analysis of C-8 in the 1999 Cattle Team Report, which was co-authored by DuPont, it was subsequently revealed that DuPont had detected C-8 in the Dry Run Creek at levels as high as 1.9 parts per million as early as 1990 (see Exhibit C), after DuPont had dumped over 7,000 tons of C-8 contaminated sludge into the unlined Dry Run Landfill in 1988 (see Exhibit D).

I 2- - References DuPont Co., Haskell Laboratory Data: 1968.

This study formed the basis for the calculation ofa drinking water criterion proposed in DuPont's Environreport.

Attached hereto is a copy of an internal DuPont memorandum referencing the existence of an even lower internal, DuPont "acceptable blood level for female employees" of 0.4 ppm from at least as far back as 1981.

AR-226 and/or OPPT-2003-0012 Re: Submission of DuPont Progress Report on Environmental Assessments Pursuant to the APFO Users LOI dated March 14, 2003 Dear Sir/Madam: This progress report is submitted in accordance with commitments made by DuPont in section D2 ofthe above-referenced APFO Users LOL.

According to DuPont and Chemours, in 2013, DuPont discontinued the use and discharge of PFOA at the Washington Works facility.

PFOA: Lactational and Placental Transport Pharmacokinetic Study in Rats DuPont- 13309 Study Title PFOA: Lactational and Placental Transport Pharmacokinetic Study in Rats Laboratory Project ID: DuPont-13309 T-b8%1\ AUTHOR:Eve Mylchreest, Ph.D.

DuPont, therefore, submitted to USEPA in its August 10, 2006, letter certai n '-/ In its August 10, 2006, letter, DuPont referred to the protocols as "drafts ."

479 /"N TRADE SECRET DuPont-11671 fiK S L ifi-W Study Title H-25499 and H-25500: Subchronic Toxicity 90-Day Gavage Study in Male Rats Laboratory Project ID: DuPont-11671 A u t h o r : Linda A.

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.

Robert F Pinchot 07/09/2001 07:26 AM To: Catherine A Barton/AE/DuPont@ DuPont cc: Debbie J Mulrooney/AE/DuPont DuPont Subject: Re: ||) Cathie, Debbie, Sorry, I forgot to send that to you.

Environmental Control Consultant DuPont Washington Works P.O.

Xi du Font d N--oun and Coapany ^snotconfafnTSCAes 2 - Substance Tested; Synonys/Codes; GENERAL INFORMATION DuPont HLR 309-93 Physical Fora; Coapositioni Sponsor; Study Initiated - Completed; In Life Phase Initiated - Completed; DuPont Ch--icals B.