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Matrix Interference During PFAS Analysis via Method 537 Mod Max

Geosyntec Consultants of NC, PC (Geosyntec) has prepared this memorandum for The Chemours Company FC, LLC (Chemours) to describe matrix interference observed during the analysis of 70 per- and polyfluoroalkyl substances (PFAS), including 22 Table 3+ PFAS, by the EPA Method 537 Modified Max (“537 Mod Max”; a modified and extended version of EPA Method 537) analytical method.

CO Addendum Paragraph 4(c) – Stormwater Treatment System Capture and Removal Efficiency Report

Pursuant to the requirements of paragraph 4(c) of the Addendum to Consent Order Paragraph 12 (CO Addendum), please find enclosed the Stormwater Treatment System Capture and Removal Efficiency Report (SWTS Capture and Efficiency Report).

STORMWATER TREATMENT SYSTEM CAPTURE AND REMOVAL EFFICIENCY REPORT

This Stormwater Treatment System Removal Efficiency and Capture Report has been prepared pursuant to paragraph 4(c) of the Addendum to Consent Order Paragraph 12 (CO Addendum).

Interim SEEP Remediation Operation and Maintenance Report #12

This Operations and Maintenance Report #12 (O&M Report #12) has been prepared to document the operations, maintenance, and performance of the flow-through cells at Seeps A, B, C, and D from November 1 through December 31, 2022.

Interim SEEP Remediation Operation and Maintenance Report #13

This Operations and Maintenance Report #13 (O&M Report #13) has been prepared to document the operations, maintenance, and performance of the flow-through cells at Seeps A, B, C, and D from January 1 through February 28, 2023.

Paragraph 11(d) Ongoing Sampling – 2021 Quarters 1 and 2 Semi-Annual Report

Pursuant to paragraph 11(d) in the executed Consent Order entered February 25, 2019 amongst Chemours, the North Carolina Department of Environmental Quality (DEQ), and Cape Fear River Watch, please find enclosed the Characterization of PFAS in Process and Non- Process Wastewater and Stormwater: Ongoing Sampling – 2021 Quarters1 and 2 Semi-Annual Report (Paragraph 11(d) Semi-Annual Report).

ONSITE SEEPS LONG-TERM LOADING CALCULATION PLAN Chemours Fayetteville Works

Geosyntec Consultants of NC, PC (Geosyntec) has prepared this Onsite Seeps LongTerm Loading Calculation Plan (“the Plan”) on behalf of The Chemours Company FC, LLC (Chemours) pursuant to the requirements of paragraph 2(c)(ii) of the Addendum to Consent Order Paragraph 12 (CO Addendum).

CHARACTERIZATION OF PFAS IN PROCESS AND NON-PROCESS WASTEWATER AND STORMWATER Ongoing Sampling – 2021 Quarters 1 and 2 Semi-Annual Report

This report was prepared by Geosyntec Consultants of NC, P.C. (Geosyntec) for The Chemours Company FC, LLC (Chemours) as the first semiannual report for Ongoing Sampling of the 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).

THERMAL OXIDIZER CONTROL EFFICIENCY COMPLIANCE TEST REPORT TEST DATES: 28-29 FEBRUARY 2020

THE CHEMOURS COMPANY FAYETTEVILLE, NORTH CAROLINA

Development of a Total Organic Fluorine Method for the Analysis of Process Wastewater Streams and Air from Fayetteville Works (NC)

Per- and polyfluoroalkyl substances (PFAS) are of interest because many have long persistence in the environment and widespread presence in humans and wildlife [1]. PFAS have been used in many products since the 1950s.