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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)

CAPE FEAR RIVER PFAS MASS LOADING CALCULATION PROTOCOL

Geosyntec Consultants of NC, PC (Geosyntec) has prepared this per- and polyfluoroalkyl substances (PFAS) Mass Loading Protocol (“Mass Loading Protocol”) on behalf of The Chemours Company FC, LLC (Chemours) pursuant to the requirements of Paragraph 1 (a) and (b) of the Addendum to Consent Order Paragraph 12 (CO Addendum).

CAPE FEAR RIVER PFAS MASS LOADING ASSESSMENT - FOURTH QUARTER 2021 REPORT

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

CFR Long-Term Remedy Performance Monitoring Report #3 July – September 2023

This CFR Long-Term Remedy Performance Monitoring Report #3 (“Report”) has been prepared for the Q3 2023 period of July 1 through September 30, 2023 and documents the continued 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).

Cape Fear River PFAS Mass Loading Assessment - Fourth Quarter 2022 Report

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

CFR Long-Term Remedy Performance Monitoring Report #2 April-June 2023

This CFR Long-Term Remedy Performance Monitoring Report #2 (“Report”)1 has been prepared for the Q2 2023 period of April 1 through June 30, 2023 and documents the continued operation of the interim seep Flow-Through Cells (FTCs), the groundwater extraction and conveyance system (GWEC), and the groundwater treatment plant (GWTP); the commissioning and startup of the ex-situ seeps and weeps capture systems (“Ex-Situ Capture Systems”); and the completion of the barrier wall.

CAPE FEAR RIVER PFAS MASS LOADING ASSESSMENT – FOURTH QUARTER 2023

Geosyntec Consultants of NC, P.C. (Geosyntec) has prepared this Cape Fear River PFAS Mass Loading Assessment - Fourth 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.