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CAPE FEAR RIVER PFAS MASS LOADING ASSESSMENT – FIRST QUARTER 2023

Geosyntec Consultants of NC, P.C. (Geosyntec) has prepared this Cape Fear River PFAS Mass Loading Assessment - First Quarter 2023 Report for The Chemours Company, FC, LLC (Chemours).

Appendix A Cape Fear River PFAS Mass Loading Model

The objective of this appendix is to estimate the mass discharge from the identified PFAS transport pathways using a Cape Fear River mass loading model developed and described in the Cape Fear River Mass Loading Calculation Protocol Version 2 (Geosyntec, 2020a) and to assess the relative contributions by pathway.

CHARACTERIZATION OF PFAS IN PROCESS AND NON-PROCESS WASTEWATER AND STORMWATER Quarterly Report #5

This report was prepared by Geosyntec Consultants of NC, P.C. (Geosyntec) for The Chemours Company FC, LLC (Chemours) to provide a quarterly update on the identification and concentrations of per- and polyfluoroalkyl substances (“PFAS”) in process wastewater, non-process wastewater, and stormwater at the Chemours Fayetteville Works, North Carolina site (the Facility, Figure 1)

CAPE FEAR RIVER PFAS MASS LOADING ASSESSMENT – FIRST QUARTER 2024

Geosyntec Consultants of NC, P.C. (Geosyntec) has prepared this Cape Fear River PFAS Mass Loading Assessment - First Quarter 2024 Report for The Chemours Company, FC, LLC (Chemours).

Interim SEEP Remediation Operation and Maintenance Report #9

This Operations and Maintenance Report #9 (O&M Report #9) has been prepared to document the operations, maintenance, and performance of the flow-through cells at Seeps A, B, C, and D from May 1 through June 30, 2022.

Lancaster TB6 SOP redacted June 2020

T-PFAS-WI32768

Q4 2020 Mass Load Assessment Appendices

This appendix summarizes the field methods employed to conduct monitoring activities for total per- and polyfluoroalkyl substances (PFAS) mass loading to the Cape Fear River at and surrounding the Chemours Fayetteville Works, North Carolina site (the Site).

Q2 2020 Mass Load Assessment Appendices

CFR Long-Term Remedy Performance Monitoring Report #4 October – December 2023

This CFR Long-Term Remedy Performance Monitoring Report #4 (“Report”) has been prepared for the Q4 2023 period of October 1 through December 31, 2023 and documents the operation of the interim seep Flow-Through Cells (FTCs), the ex-situ seeps and weeps capture systems (“Ex- Situ Capture Systems”), the groundwater extraction and conveyance system (GWEC), and the groundwater treatment plant (GWTP).

Submission of PFAS Non-Targeted Analysis and Methods Interim Report Chemours Fayetteville Works, Fayetteville, NC

Chemours is submitting the enclosed PFAS Non-Targeted Analysis and Methods Interim Report #3. This report is prepared pursuant to Paragraph 11(a) in the executed Consent Order entered February 25, 2019 between Chemours and the North Carolina Department of Environmental Quality (DEQ) with the Cape Fear River Watch (CFRW), and the PFAS Non- Targeted Analysis and Methods Development Plan, Version 2 (the Development Plan, Chemours and Geosyntec, 2019), the June 30, 2020 PFAS Non-Targeted Analysis and Methods Interim Report (Chemours, June 2020) and the December 31, 2020 PFAS Non-Targeted Analysis and Methods Interim Report #2 (Chemours, December 2021)