Company Executives

Management Team

From the 10-K annual report

Officer	Age	In this role	Joined	2025 pay
Mark Duff Also a director President and CEO	63	Not stated	Not stated	$453,081
Ben Naccarato Chief Financial Officer (“CFO”), EVP, and Secretary	63	Not stated	2004	$392,185
Troy Eshleman Chief Operating Officer (“COO”)	56	Since 2025 1 year	2025	$624,131
Louis Centofanti Also a director EVP of Strategic Initiatives	88	Not stated	Not stated	$308,552
Richard Grondin EVP of Hanford and International Waste Operations	67	Since 2025 1 year	2002	$359,682

Each officer opens the passage of the filing that names them. A title that changed since the list comes from the officer's latest Form 3, 4 or 5, and its start year is not stated there. "Not stated" means the filing does not say. Pay is the proxy's Summary Compensation Table, which reports only the named executive officers.

Board of Directors

From the proxy statement filed Jun 12, 2026

Directors

serving now

Independent

7 of 9

stated in the proxy

Average tenure

15.7 years

from year joined

CEO also chairs the board

Larry M. Shelton

Director	Age	On board	Independent	Committees	Other public boards	2025 pay
Larry M. Shelton Board chair	72	2006 20 years	Independent	Audit Committee	None stated	$196,213
Mark J. Duff CEO	63	2023 3 years	Not independent	None stated	None stated	Paid as CEO
Mark A. Zwecker Lead independent director	75	1991 35 years	Independent	Audit Committee · Chair	None stated	$178,566
Thomas P. Bostick	69	2020 6 years	Independent	Governance and Nominating Committee	CSX Corporation	$153,434
Louis F. Centofanti	82	1991 35 years	Not independent	Strategic Advisory Committee · Chair	None stated	Not stated
Kerry C. Duggan	47	2021 5 years	Independent	Governance and Nominating Committee	None stated	$151,184
Joseph T. Grumski	65	2020 6 years	Independent	Compensation and Stock Option Committee · Chair	None stated	$177,434
Joe R. Reeder	78	2003 23 years	Independent	None stated	None stated	$167,435
Zach P. Wamp	68	2018 8 years	Independent	None stated	None stated	$153,619

Each director opens the passage of the proxy that names them. "Not stated" means the proxy does not say; it never means "no". Pay is the proxy's Director Compensation table; the CEO is paid as an executive.

1 disclosed in the proxy filed Jun 12, 2026

David Centofanti

son of Dr. Louis F. Centofanti, our EVP of Strategic Initiatives, who is also a Board member

$200,000

2025

Employment as Vice President of Information Systems with annual compensation of $200,000.

Open in proxy

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Company Executives

Management Team

Board of Directors

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