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Company: Century Aluminum Of Kentucky, LLC P.O. Box 500 SARA 313 Component Inventory Detail Report Reporting Year 2017 The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed. Hawesville KY 42348 The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds. Component: 1,1-dichloro-1-fluoroethane MSDS Date %Max Tradename Manufacturer Total Usage Usage %Min Rng MSDS ID 5/21/1996 96.00 CONTACT CLEANER 2000 CRC CHEMICALS/INDUSTRIES, INC. 1,161 1,115 N CLNR-2000 Component Total: 1,115 MSDS Date %Max Tradename Manufacturer Total Usage Usage %Min Rng MSDS ID 12/7/2010 4.50 MARATHON REGULAR UNLEADED GASOLINE MARATHON PETROLEUM CO. 104,618 4,708 0.90 Y 71347120 Component Total: 4,708 Component: 1,2,4-trimethylbenzene MSDS Date %Max Tradename Manufacturer Total Usage Usage %Min Rng MSDS ID 4/5/2012 1.00 KRYLON HIGH HEAT & RADIATOR PAINT BLACK KRYLON PRODUCTS GROUP 123 1 N 70971593 12/2/2003 1.00 KRYLON OSHA COLORS SAFETY YELLOW 1813 SHERWIN-WILLIAMS/KRYLON PRODUCTS GROUP 66 1 N 70971668 9/5/1997 2.00 KRYLON 1501 INT/EXT GLOSSY WHITE KRYLON (1) 52 1 N 70971692 Component Total: 3 Component: 1-butanol Copyright (c) 2006 by MSDS1, Inc. All rights reserved. Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer. Sunday, December 31, 2017 Page 1

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Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: 1,1-dichloro-1-fluoroethane

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

5/21/1996 96.00CONTACT CLEANER 2000 CRC CHEMICALS/INDUSTRIES,INC.

1,161 1,115NCLNR-2000

Component Total: 1,115

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

12/7/2010 4.50MARATHON REGULAR UNLEADEDGASOLINE

MARATHON PETROLEUM CO. 104,618 4,7080.90Y71347120

Component Total: 4,708

Component: 1,2,4-trimethylbenzene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

4/5/2012 1.00KRYLON HIGH HEAT & RADIATOR PAINTBLACK

KRYLON PRODUCTS GROUP 123 1N70971593

12/2/2003 1.00KRYLON OSHA COLORS SAFETY YELLOW1813

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

66 1N70971668

9/5/1997 2.00KRYLON 1501 INT/EXT GLOSSY WHITE KRYLON (1) 52 1N70971692

Component Total: 3

Component: 1-butanol

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 1

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: 1-chloro-1,1,2,2-tetrafluoroethane

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

10/20/1995 5.00SUVA 124 DUPONT (1) 630 32N71315097

Component Total: 32

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

10/20/1995 94.70SUVA 124 DUPONT (1) 630 597N71315097

Component Total: 597

Component: 2-chloro-1,1,1,2-tetrafluoroethane

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

6/7/2009 5.00KROIL KANO LABORATORIES, INC. 2,838 1421.00YKROIL

Component Total: 142

Component: aliphatic alcohols(1)

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

1/31/2008 96.00ESAB ALL-STATE BARE ALUMINUM 4043WIRE

ESAB GROUP, INC. (1) 510 49094.00YE4043

Component Total: 490

Component: aluminum

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 2

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: aluminum and/or aluminum alloys

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

10/21/2005 0.50OUTERSHIELD 71M AND 71M-H LINCOLN ELECTRIC CO. 350 2Y71M

Component Total: 2

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

1/20/2004 100.00UNI-PLAS 85ESS UNITED REFRACTORIES CO. 62,820 62,8200.00Y70995683

Component Total: 62,820

Component: aluminum oxide (alumina)

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

10/15/1996 100.00ACID FLUX CORED SOLDER KESTER SOLDER 2 2YACIDFLUX

Component Total: 2

Component: antimony

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

4/17/1998 5.00BAFCO FILM FREE GLASS CLEANER BARRET-FISHER CO., INC. 60 3YGLASSCLN

Component Total: 3

Component: aqua ammonia

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 3

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: benzene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

12/7/2010 3.20MARATHON REGULAR UNLEADEDGASOLINE

MARATHON PETROLEUM CO. 104,618 3,3480.45Y71347120

Component Total: 3,348

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

9/1/2001 100.00REFRIGERANT 22 (HCFC-22) NATIONAL REFRIGERANTS,INC.

210 210N70801048

Component Total: 210

Component: chlorodifluoromethane (hcfc-22)

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

7/23/1997 25.00C-5A ANTISEIZE FEL-PRO CHEMICALPRODUCTS, L.P. (1)

48 12YANTISEIZE

1/31/2008 0.50ESAB ALL-STATE BARE ALUMINUM 4043WIRE

ESAB GROUP, INC. (1) 510 3YE4043

10/1/1997 30.00ARCAIR AIR CARBON ARC ELECTRODES TWECO PRODUCTS, INC. 500 15010.00YWELD ROD

Component Total: 165

Component: copper

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 4

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: cumene hydroperoxide

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

1/1/1993 3.00BEARING MOUNT/GRADE B LOCTITE CORP. 1 01.00Y70934807

1/22/1996 3.00ADHESIVE/SEALANT 271 LOCTITE CORPORATION 0 01.00YADHESI 271

5/21/2009 5.00LOCTITE 242 THREADLOCKER HENKEL LOCTITECORPORATION

4 01.00YLOC242

Component Total: 0

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

12/7/2010 1.80MARATHON REGULAR UNLEADEDGASOLINE

MARATHON PETROLEUM CO. 104,618 1,8830.45Y71347120

Component Total: 1,883

Component: ethyl benzene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/28/2010 3.00SPRAYON RED INSULATING VARNISH SHERWIN-WILLIAMS/DIVERSIFIEDBRANDS, INC

10 0N70947320

6/17/2003 2.00KRYLON HIGH HEAT & RADIATOR PAINT,ALUM.

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

71 1N70971585

Component: ethylbenzene

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 5

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: ethylbenzene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

4/5/2012 0.40KRYLON HIGH HEAT & RADIATOR PAINTBLACK

KRYLON PRODUCTS GROUP 123 0N70971593

6/17/2003 2.00KRYLON OSHA COLORS SAFETY POPORNG 2410

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

30 1N70971601

6/17/2003 2.00KRYLON OSHA COLORS SAFETY PURPLE1929

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

11 0N70971619

8/17/1998 2.00SW IND. MNT.&TOUCHUP SPRAY-2501LEATHER

SHERWIN-WILLIAMS/DIVERSIFIEDBRANDS, INC

8 0N70971627

10/14/2003 2.00KRYLON INT/EXT PAINT, BANNER RED2108

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

89 2N70971635

6/17/2003 1.00KRYLON INT/EXT TRUE BLUE 1910 SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

56 1N70971643

6/17/2003 2.00KRYLON INT/EXT PAINT, GLOSSY BLACK1601

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

42 1N70971650

12/2/2003 1.00KRYLON OSHA COLORS SAFETY YELLOW1813

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

66 1N70971668

6/17/2003 3.00KRYLON 1701 INT./EXT. BRIGHT GOLD SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

1 0N70971676

9/5/1997 1.00KRYLON 1501 INT/EXT GLOSSY WHITE KRYLON (1) 52 1N70971692

Component Total: 8

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 6

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: ethylbenzenes

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

3/20/2006 3.00UNIVERSAL CEMENT PLEWS SCHRADER DIVISION 1 00.00Y70934765

Component Total: 0

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

1/12/2007 97.00CHEVRON SUPREME ANTIFREEZECOOLANT

CHEVRON PRODUCTSCOMPANY

1,028 99790.00Y70945621

Component Total: 997

Component: ethylene glycol

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/5/1996 1.00PLIOBOND 30 ASHLAND CHEMICAL CO. 15 00.10Y70934757

Component Total: 0

Component: formaldehyde

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

12/7/2010 2.70MARATHON REGULAR UNLEADEDGASOLINE

MARATHON PETROLEUM CO. 104,618 2,8250.00Y71347120

Component Total: 2,825

Component: hexane

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 7

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: hydrogen fluoride

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

6/4/1999 6.00ELECTRICAL JOINT COMPOUND NO. 2 ALUMINUM CO. OF AMERICA 3 0YCMPD #2

Component Total: 0

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

1/26/1999 1.00QUICK SET 404 INSTANT ADHESIVE LOCTITE CORPORATION 1 00.10YQUICK 404

Component Total: 0

Component: hydroquinone

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

7/25/2008 100.00AEROLEX PLUS AEROSOL CHEMSEARCH, DIV. OF NCHCORP.

2 20.00YAEROLEX

Component Total: 2

Component: isopropanol

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

4/15/1997 25.00AVIATION FORM-A-GASKET #3 LOCTITE CORPORATION 7 220.00YAVIATION#3

4/17/1998 5.00BAFCO FILM FREE GLASS CLEANER BARRET-FISHER CO., INC. 60 3YGLASSCLN

5

Component: isopropyl alcohol

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 8

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: isopropyl alcohol

Component Total:

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

10/15/1996 100.00ACID FLUX CORED SOLDER KESTER SOLDER 2 2YACIDFLUX

Component Total: 2

Component: lead

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

10/21/2005 5.00OUTERSHIELD 71M AND 71M-H LINCOLN ELECTRIC CO. 350 18Y71M

Component Total: 18

Component: manganese and/or manganese alloys

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

5/10/2001 0.50FLEETWELD 180 ELECTRODES AWSE6011

LINCOLN ELECTRIC CO. 500 3NE6011

Component Total: 3

Component: manganese and/or manganese alloys& compo

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

1/20/1996 1.00FLEETWELD 5P AWS E6010 LINCOLN ELECTRIC CO. 150 2NLIN6010

Component: manganese compounds

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 9

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: manganese compounds

Component Total: 2

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

3/20/2006 32.00UNIVERSAL CEMENT PLEWS SCHRADER DIVISION 1 028.00Y70934765

Component Total: 0

Component: methlyene chloride

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/5/1996 69.00PLIOBOND 30 ASHLAND CHEMICAL CO. 15 10N70934757

6/17/2003 9.00KRYLON OSHA COLORS SAFETY POPORNG 2410

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

30 3N70971601

6/17/2003 8.00KRYLON OSHA COLORS SAFETY PURPLE1929

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

11 1N70971619

8/17/1998 8.00SW IND. MNT.&TOUCHUP SPRAY-2501LEATHER

SHERWIN-WILLIAMS/DIVERSIFIEDBRANDS, INC

8 1N70971627

10/14/2003 9.00KRYLON INT/EXT PAINT, BANNER RED2108

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

89 8N70971635

6/17/2003 8.00KRYLON INT/EXT TRUE BLUE 1910 SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

56 4N70971643

Component: methyl ethyl ketone

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 10

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: methyl ethyl ketone

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

6/17/2003 13.00KRYLON INT/EXT PAINT, GLOSSY BLACK1601

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

42 5N70971650

12/2/2003 9.00KRYLON OSHA COLORS SAFETY YELLOW1813

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

66 6N70971668

9/5/1997 10.00KRYLON 1501 INT/EXT GLOSSY WHITE KRYLON (1) 52 5N70971692

5/15/1992 15.00PPG QUICK DRY SPRAY ENML, 55-B (302,...)

PPG INDUSTRIES, INC. 26 410.00YPPG 55-B

Component Total: 48

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

8/17/1998 1.00SW IND. MNT.&TOUCHUP SPRAY-2501LEATHER

SHERWIN-WILLIAMS/DIVERSIFIEDBRANDS, INC

8 0N70971627

10/14/2003 2.00KRYLON INT/EXT PAINT, BANNER RED2108

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

89 2N70971635

6/17/2003 3.00KRYLON INT/EXT TRUE BLUE 1910 SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

56 2N70971643

12/2/2003 5.00KRYLON OSHA COLORS SAFETY YELLOW1813

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

66 3N70971668

Component: methyl isobutyl ketone

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 11

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: methyl isobutyl ketone

Component Total: 7

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

10/26/1998 60.00GOLDEN BELT DRESSING AEROSOL ITW FLUID PRODUCTS GROUP(2)

105 6330.00Y70997135

Component Total: 63

Component: methylene chloride

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

2/1/1996 5.00JETWELD LH-70, E7018 LINCOLN ELECTRIC CO. 2,000 100YLIN LH-70

Component Total: 100

Component: mineral silicates

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

3/20/2006 12.00UNIVERSAL CEMENT PLEWS SCHRADER DIVISION 1 08.00Y70934765

Component Total: 0

Component: mixed xylenes

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 12

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: naphthalene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

12/7/2010 0.50MARATHON REGULAR UNLEADEDGASOLINE

MARATHON PETROLEUM CO. 104,618 5230.10Y71347120

4/21/1990 3.00CHEVRON HEATING FUEL NO. 1 EMMICK OIL INC. 3,572 107Y8000132

7/31/2006 0.20DIESEL FUEL NO. 2 CHEVRON PRODUCTSCOMPANY

519,927 1,0400.02YHSDIESEL

Component Total: 1,670

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/5/1996 1.00PLIOBOND 30 ASHLAND CHEMICAL CO. 15 0N70934757

Component Total: 0

Component: phenol

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

1/20/2004 100.00UNI-PLAS 85ESS UNITED REFRACTORIES CO. 62,820 62,8200.00Y70995683

Component Total: 62,820

Component: phosphoric acid

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 13

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: propylene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

3/21/2006 20.00PROPANE CONOCOPHILLIPS(1) 19,133 3,8270.00Y71337737

Component Total: 3,827

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

1/1/1993 3.00BEARING MOUNT/GRADE B LOCTITE CORP. 1 01.00Y70934807

1/22/1996 5.00ADHESIVE/SEALANT 271 LOCTITE CORPORATION 0 03.00YADHESI 271

5/21/2009 5.00LOCTITE 242 THREADLOCKER HENKEL LOCTITECORPORATION

4 01.00YLOC242

Component Total: 0

Component: saccharin

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

10/15/1996 100.00ACID FLUX CORED SOLDER KESTER SOLDER 2 2YACIDFLUX

Component Total: 2

Component: silver

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

9/9/2002 98.00SULFURIC ACID SHRIEVE CHEMICAL CO. 51,140 50,11793.00Y70631776

Component: sulfuric acid

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 14

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: sulfuric acid

Component Total: 50,117

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/28/2010 17.00SPRAYON RED INSULATING VARNISH SHERWIN-WILLIAMS/DIVERSIFIEDBRANDS, INC

10 2N70947320

4/5/2012 28.00KRYLON HIGH HEAT & RADIATOR PAINTBLACK

KRYLON PRODUCTS GROUP 123 34N70971593

6/17/2003 38.00KRYLON 1701 INT./EXT. BRIGHT GOLD SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

1 0N70971676

12/7/2010 13.50MARATHON REGULAR UNLEADEDGASOLINE

MARATHON PETROLEUM CO. 104,618 14,1230.90Y71347120

Component Total: 14,160

Component: toluene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

3/20/2006 56.00UNIVERSAL CEMENT PLEWS SCHRADER DIVISION 1 152.00Y70934765

Component Total: 1

Component: trichloroethylene

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 15

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: xylene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/28/2010 15.00SPRAYON RED INSULATING VARNISH SHERWIN-WILLIAMS/DIVERSIFIEDBRANDS, INC

10 1N70947320

6/17/2003 12.00KRYLON HIGH HEAT & RADIATOR PAINT,ALUM.

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

71 9N70971585

4/5/2012 2.00KRYLON HIGH HEAT & RADIATOR PAINTBLACK

KRYLON PRODUCTS GROUP 123 2N70971593

6/17/2003 9.00KRYLON OSHA COLORS SAFETY POPORNG 2410

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

30 3N70971601

6/17/2003 10.00KRYLON OSHA COLORS SAFETY PURPLE1929

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

11 1N70971619

8/17/1998 11.00SW IND. MNT.&TOUCHUP SPRAY-2501LEATHER

SHERWIN-WILLIAMS/DIVERSIFIEDBRANDS, INC

8 1N70971627

10/14/2003 9.00KRYLON INT/EXT PAINT, BANNER RED2108

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

89 8N70971635

6/17/2003 8.00KRYLON INT/EXT TRUE BLUE 1910 SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

56 4N70971643

6/17/2003 9.00KRYLON INT/EXT PAINT, GLOSSY BLACK1601

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

42 4N70971650

12/2/2003 7.00KRYLON OSHA COLORS SAFETY YELLOW1813

SHERWIN-WILLIAMS/KRYLONPRODUCTS GROUP

66 5N70971668

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 16

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are otherwise used by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 10000 pounds.

Component: xylene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

9/5/1997 7.00KRYLON 1501 INT/EXT GLOSSY WHITE KRYLON (1) 52 4N70971692

12/7/2010 9.00MARATHON REGULAR UNLEADEDGASOLINE

MARATHON PETROLEUM CO. 104,618 9,4161.80Y71347120

5/15/1992 35.00PPG QUICK DRY SPRAY ENML, 55-B (302,...)

PPG INDUSTRIES, INC. 26 930.00YPPG 55-B

Component Total: 9,467

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

10/15/1996 100.00ACID FLUX CORED SOLDER KESTER SOLDER 2 2YACIDFLUX

Component Total: 2

Component: zinc chloride

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 17

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are processed by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 25000 pounds.

Component: 1,2-benzanthracene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 1.11CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 452,4890.48Y9170

Component Total: 452,489

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 1.30CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 529,9420.56Y9170

Component Total: 529,942

Component: 1,2-benzphenanthrene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

2/9/1999 1.00SILICON METAL GLOBE METALLURGICAL, INC. 12,000 120YSILCN METL

Component Total: 120

Component: aluminum

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

1/1/2010 99.10CALCINED ALUMINA SHERWIN ALUMINA 418,261,760 414,497,404

98.00Y9110

1/5/2007 100.00MORCOCAST HS-0 MISSOURI REFRACTORIESCOMPANY INC.

9,600 9,60045.00YMORCOCAST

Component: aluminum oxide

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 18

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are processed by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 25000 pounds.

Component: aluminum oxide

Component Total: 414,507,004

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 0.77CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 313,8890.04Y9170

Component Total: 313,889

Component: anthracene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 1.67CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 680,7711.05Y9170

Component Total: 680,771

Component: benzo(a)pyrene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 1.30CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 529,9420.79Y9170

Component Total: 529,942

Component: benzo(b)fluoranthene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 1.34CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 546,2480.83Y9170

Component: benzo(g,h,i)perylrene

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 19

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are processed by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 25000 pounds.

Component: benzo(g,h,i)perylrene

Component Total: 546,248

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 0.66CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 269,0470.39Y9170

Component Total: 269,047

Component: benzo(j)fluoranthene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 0.75CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 305,7360.46Y9170

Component Total: 305,736

Component: benzo(k)fluoranthene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 1.39CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 566,6301.06Y9170

Component Total: 566,630

Component: dibenz(a,h)anthracene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 0.28CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 114,1410.16Y9170

Component: dibenzo(a,e)pyrene

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 20

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are processed by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 25000 pounds.

Component: dibenzo(a,e)pyrene

Component Total: 114,141

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 1.49CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 607,3950.12Y9170

Component Total: 607,395

Component: dibenzo(a,h)pyrene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 0.35CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 142,6770.11Y9170

Component Total: 142,677

Component: dibenzo(a,i)pyrene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 0.14CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 57,0710.12Y9170

Component Total: 57,071

Component: dibenzofuran

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 1.59CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 648,1590.37Y9170

Component: fluoranthene

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 21

Company: Century Aluminum Of Kentucky, LLC

P.O. Box 500

SARA 313 Component Inventory Detail Report

Reporting Year 2017

The following chemicals in your facility are listed on the SARA 313 Listing by component name. Consumption data provided by your facility is also listed.

Hawesville KY 42348

The following chemicals are processed by your facility. A Form R should be completed for all chemicals with consumption levels exceeding 25000 pounds.

Component: fluoranthene

Component Total: 648,159

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

5/29/2007 70.00HAWTHORN BOND CLAY.. CHRISTY MINERALS COMPANY 6,000 4,2000.00Y8001740

Component Total: 4,200

Component: free aluminum oxide

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 0.26CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 105,9880.15Y9170

Component Total: 105,988

Component: indeno(1,2,3-cd)pyrene

MSDS Date %MaxTradename Manufacturer Total Usage Usage%MinRngMSDS ID

11/15/2012 0.31CARBON PITCH LIQUID KOPPERS CO., INC. 40,764,742 126,3710.05Y9170

Component Total: 126,371

Component: phenanthrene

Copyright (c) 2006 by MSDS1, Inc. All rights reserved.

Note: If "Y" appears in the "Rng" (Range) column, the percentage of mix for this component is listed on the MSDS as a range. The minimum and maximum percentages are given, if known, but the calculations assume the maximum percentage. It may be necessary to recalculate the YTD quantity used after verifying the actual percentage with the manufacturer.

Sunday, December 31, 2017 Page 22