SEVERN TRENT LABORATORIES ANALYTICAL REPORT JOB NUMBER: 249892 Prepared For: Weston Solutions, Inc. 1400 Weston Way Building 5-2 West Chester, PA 19380-1499 Project: Confidential Decatur Attention: Jai Kesari Date: 01/03/2007 Signature Name: Richard C.

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Attachments to Letter to C.

ATTACHMENT TO LETTER TO C.

3MGeneral Offices 3M Center St.

BACK TO MAIN BIODEGRADATION (Acclimated Activated Sludge and Sediment Cultures) TEST SUBSTANCE Identity: Perfluorooctanesulfonate; may also be referred to as PFOS or FC-95. (1-Octanesulfonic acid, 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.

02/28/2001 ENVIRONMENTAL LABORATORY ARCHIVED FINAL REPORT B1ACK TO MAIN LAB REQUEST NO. 8442 REQUESTOR NAME: EAR DEPARTMENT: 0535 PROJECT NO: 9970012600 DATE RECEIVED: 0 9 / 0 7 / 1 9 8 2 DESC: ENVIRONMENTAL SCREEN ON L-6778 CONTRACT LAB(S): EXP COMP DATE: 11/12/1982 DATE COMPLETED: 1 1 / 0 9 / 1 9 8 2 PROJECT LEAD: PHONE NO: 3M FAX NO: 651-778-6176 EVAPORATE TO DRYNESS UNDER AIR OR N2.

Final Report Mortality Study of Workers Employed at the 3M Cottage Grove Facility BACK TO MAIN Submitted by: Bruce H.

~ ~~ ~ ~~~ BACK TO MAIN 3M Medical Department Study: T-6314.1 Analytical Report: FACT TOX-028 LRN-U2636 Study Title Determinationof the Presence and Concentration of PFOS, PFOSA, M556, andM570 in the 13-Week Dietary Study of Crl:CD@(!

SELECTED FLUOROCHEMICALS IN THE DECATUR, ALABAMA AREA Prepared for: 3M St.

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AR226-2282 pTTP""- j~T'" ,4^ Debbfe J Mulrooney 1..^ " 05/03/2002 03:23 PM s To: cc: Subject: DilROBERTS@mail.dep.state.wv.us Bernard J ReilIy/AE/DuPont@DuPont Robert F PinchoVDEV/AE/DuPont@DuPont Little Hocking Receptor Grid Dave, In our meeting in Charleston last week you asked if I could provide to you the receptor grid that I used for modeling deposition in the Little Hocking watershed (as shown in Figure 3 in our draft report).

AR226-2311 P PaulR Jann 03/13/2003 01:27 PM To: crc Subject: Catherine A Barton/AE/DuPont@DuPont Wilfred K Whitcraft/AE/DuPont@DuPont, Charles J Zaizecki/AE/DuPont@DuPont, Mark C Hause/DuPontQDuPont Re: air monitoring D Cathy.

AR226-2519 Ta-Wei Fu 11/12/02 02:13 PM To: Charles J Noelke/AE/DuPont@DuPont cc: Steven H Swearingen/AE/DuPont@DuPont Subject: Eureka!

Mileu Consulting SPRL Att: Claire Dupont Chaussee de Charleroi 112 Brussels 1060 Belgia oYouxr reference: 2O0u15r/e4f5e3re6nce: Gi 134, 2009 CGasee haBndolmer: Notice of award of contract in competition for "Per- and polyfluoroalkyl ethers -- identity, production and use" Case no: 2019/4936 We refer to the tender competition * Per- and polyfluoroalkyl ethers - identity, production and use " (case number 2019/4936) and your offer dated 8 May 2019.