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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.

Consent Order Addendum – Submission Pursuant to Paragraph 1.b - March 28, 2023

Please find enclosed the Cape Fear River PFAS Mass Loading Assessment – Fourth Quarter 2023 Report.

Q4 2021 Mass Load Assessment Appendices

This appendix presents results from the Q4 2021 sampling events described in Section 2 of the main report.

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 contributions by pathway.