EPA Sangsook Choi, Environmental Engineer Valerie Dooling, Environmental Engineer Lead US EPA Inspector: Sangsook Choi Sangsook Digitally signed by Sangsook Choi Date: 2023.09.06 Inspector Signature: __C_h__o_i _________15_:1_7:5_4_-0_5'_00_' ____________ Approver Name and Title: Ryan Bahr, Section 2 Supervisor, Water Enforcement and Compliance Assurance Branch Approver Signature and Date: Digitally signed by RYAN RYAN BAHR Date: 2023.09.06 BAHR ______________15_:5_4:_18_-0_5_'00_' __________________ 2 Contents SECTION 1.0: INTRODUCTION ......................................................................................................... 4 SECTION 2.0: SITE BACKGROUND AND PRELIMINARY REVIEW ........................................ 4 SECTION 3.0: SUPPLEMENTAL DATA REVIEW/INTERVIEW ................................................. 4 A.

ELSEVIER Regulatory Toxicology and Pharmacology 134 (2022) 105226 Contents lists available at ScienceDirect Regulatory Toxicology and Pharmacology journal homepage: www.elsevier.com/locate/yrtph Grouping of PFAS for human health risk assessment: Findings from an independent panel of experts J.K.

Incident Summary - May 5- May 7, 2023 On May 3, 2023, the lead operator prepared equipment for maintenance on a heat exchanger (E-P31133), which involved replacing the tube bundle inside the exchanger.

NEICVP1373E01 NEIC CIVIL INVESTIGATION REPORT MAX Environmental Technologies, Inc. 233 MAX Lane Yukon, Pennsylvania 15698 Investigation Dates: March 20 - 24, 2023 BRIAN Digitally signed by BRIAN KENNEDY KENNEDY 07:38:11 -06'00' Date: 2023.07.21 Brian Kennedy, P.E.

Lubricant Additives: Use and Benefits AUGUST 2016 / ATC DOCUMENT 118 Technical Committee of Petroleum Additive Manufacturers in Europe Contents ABSTRACT 4 EXECUTIVE SUMMARY 5 INTRODUCTION 7 Aim 8 Scope 8 ATC 8 ATC Organisation and Objectives 9 THE PETROLEUM ADDITIVE INDUSTRY 10 EUROPEAN ENGINE LUBRICANT ADDITIVE INDUSTRY PROFILE 13 Sources of Data 14 The Automotive Engine Lubricant Additive Business 15 Development of New Additives 16 Cost, Complexity and Confidentiality 16 HISTORY OF ADDITIVE DEVELOPMENT 18 Introduction 19 Base Oils 20 The Pre-Additive Period - Until Early 1930s 22 The Main Steps of Lubricant Development - 1930s to Present 22 CHEMISTRY OF LUBRICANT ADDITIVES 24 Introduction 25 Oil Solubility 25 Detergents 26 Dispersants 28 Inhibitors 29 Antiwear 31 Antioxidancy and Anticorrosion 32 Antifoam Agents 33 Friction Modifiers 34 Pour Point Depressants 35 Viscosity Modifiers 35 Components and Performance Packages 36 Typical Performance Additive Packages 39 Viscosity Modifiers 40 HEALTH, SAFETY AND THE ENVIRONMENT 43 Introduction 44 REACH 44 Additive Improvements 45 Exhaust Emissions 46 Emission Reduction 47 Engine Oil Consumption and Disposal 49 Re-refining and Re-use of Engine Oil 51 BENEFITS OF LUBRICANT ADDITIVES 52 Introduction 53 Fuel Compatibility 53 Carbon Dioxide (CO2) Reduction and Fuel Economy 55 Durability and Protection 58 Lubrication Engineering 60 REFERENCES 62 Abstract The Technical Committee of Petroleum Additive Manufacturers in Europe (ATC) has carried out an analysis of the size and nature of the engine lubricants market in the 28 countries of the European Community (EU-28).

NEICVP1373E01 NEIC CIVIL INVESTIGATION REPORT MAX Environmental Technologies, Inc. 233 MAX Lane Yukon, Pennsylvania 15698 Investigation Dates: March 20 - 24, 2023 BRIAN Digitally signed by BRIAN KENNEDY KENNEDY 07:38:11 -06'00' Date: 2023.07.21 Brian Kennedy, P.E.

ExxonMobil Petroleum & Chemical BV (EMPC) Comments on Annex XV restriction report on per- and polyfluoroalkyl substances (PFAS) Fluoropolymer use in upstream, refining, and petrochemical manufacturing. 21 September 2023 Project No.: 0691418 Document details Document title Document subtitle Project No.

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One 5-gallon container stored lead acid batteries.

Sincerely, Emilio Llamozas NPDES and Wetlands Enforcement Section Enforcement and Compliance Assurance Division Enclosures: 1) City of McLaughlin WWTF NPDES Inspection Report - Wastewater Treatment Facility 2) City of McLaughlin WWTF Photo Log 3) City of McLaughlin WWTF Schematic cc: Jake Luger, Acting Environmental Director, Standing Rock Sioux Tribe (via email) 2 NPDES Inspection Report - Wastewater Treatment Facility National Database Information Inspection Date: July 13, 2022 Inspection Type: CEI - Wastewater Treatment Facility Entry/Exit Time: 8:05 am / 10:03 am NPDES ID Number: NDG589301 NAICS Code: 221320 Inspection ID: 202207_NDG589301 Lead inspector and affiliation: Emilio Llamozas / EPA Region 8 Inspector and affiliation: Stephanie Meyers / EPA Region 8 Facility Location Information (Name/Location/ Mailing Address) Site/Facility Name & Location: City of McLaughlin Wastewater Treatment Facility 106 1st Ave West NW1/4 S6 T21N R27E McLaughlin, South Dakota 57642 Email Report to: Justin Yellow Horse and Nathan Thompson City of McLaughlin mclughsd@heartlandpower.org Contact Information Name(s)/Title Justin Yellow Horse / Maintenance City Worker / City of McLaughlin / primary lead during the inspection Facility Contacts: (indicate primary lead and present during inspection) Person/Company meeting definition of "Operator" Authorized Official(s) (Per NOI?)

The samples were taken from manholes that lead to the sanitary sewer system of Gerald, Missouri.

Lead-acid battery storage at the Facility 3 6.

The persistence of some PFAS, and the persistence of their degradation products such as TFA (trifluoroacetic acid), has the potential to lead to accumulation of PFAS in the environment, compounding concerns over possible toxicity.

Attendees Organization EPA Region 10 EPA Region 10 Pacific Steel Group Pacific Steel Group Attendee Name Raymond Andrews Nicolas Haddad David Perkins Eric Benson Title Lead Inspector Inspector Executive VP General Counsel CEO Present in Opening Conf.

MIPC was represented by Matt Torell (Environmental Engineer), Ski Szymanski (Environmental Scientist), Caroline Kerr (Regulatory Compliance), Matt Day (Terminal O & R), and Josh Smith (Control Room Lead).