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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.

PFAS NON-TARGETED ANALYSIS AND METHODS INTERIM REPORT #3

This interim report has been prepared by The Chemours Company FC, LLC (Chemours) to provide an update on the characterization of previously unidentified per- and polyfluoroalkyl substances (PFAS) in aqueous samples collected from process wastewater, non-process wastewater (i.e., noncontact cooling water) and stormwater at the Chemours Fayetteville Works, North Carolina site (the Facility).

Submission of Quarterly Report #3 – Characterization of PFAS in Process and Non-Process Wastewater and Stormwater – Chemours Fayetteville Works, Fayetteville, NC. January 31, 2020

Chemours is submitting the enclosed Quarterly Report #3 – Characterization of PFAS in Process and Non-Process Wastewater and Stormwater, prepared by our consultant Geosyntec Consultants of NC, P.C.

PFAS CHARACTERIZATION SAMPLING PLAN December 2018

Process and Non-Process Wastewater and Stormwater

Extraction of 2,3,3,3-tetrafluoro-2-(1,1,2,2,3,3,3-heptafluoropropoxy) propanoic acid (HFPO-DA) in Method 0010 Sampling Trains and Surface Wipe Samples

SAMPLING SITE 71 RESIDENTIAL WELL CARBON PILOT HFPO-DA, TABLE 3 and PFAS CONCENTRATIONS

Chemours Fayetteville Works, North Carolina

Work Plan for Toxicity Studies Pursuant to Consent Order Paragraph 14 March 27, 2019

Paragraph 14 of the Consent Order states: “Within thirty (30) days of entry of this Consent Order, Chemours shall submit a plan and proposed schedule for review and approval by DEQ for funding and facilitating the conducting of an initial set of toxicity studies by a qualified third party approved by DEQ relating to both toxicity assays informative to human health and aquatic life sufficient to aid in development of surface water and groundwater regulatory standards for up to five PFAS as determined by DEQ. The plan shall provide for the studies and parameters identified in Attachment B as well as technologically feasible dosing parameters to be agreed upon by Chemours and DEQ.”

Independent Assurance Statement to The Chemours Company

ERM Certification and Verification Services (‘ERM CVS’) was engaged by The Chemours Company (‘Chemours’) to provide limited assurance in relation to the indicators for the year ending December 31st, 2018, set out below and presented in the 2020 Chemours Corporate Responsibility Commitment (CRC) Index Report (the ‘CRC Report’).

Monthly Emissions Report Pursuant to Consent Order Paragraph 8 October 21, 2019

Pursuant to Paragraph 8.d of the Consent Order, please find enclosed the October monthly emissions report for GenX Compounds from Fayetteville Works, prepared with support from our consultant, ERM NC, Inc. (“ERM”).