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US Army Corps of Engineers
Materials Testing Center

MTC Testing Team Certifications

Name Group ACI Field,
Grade 1
ACI Aggregate Testing,
Level 1
ACI Strength Testing ACI Laboratory,
Level 1
ACI Aggregate/Soil Base Course Testing ACI Cement Physical Testing ACI Laboratory,
Level 2
ACI Aggregate Testing Technician,
Level 2
Thomas Carr MTC 10/16/2023 01/17/2028 10/19/2023 10/19/2023 10/18/2023
Christine Cefalu Fort Worth 08/05/2027 07/10/2027 08/05/2027
Jason Collins St. Louis 08/25/2025 04/27/2024 04/27/2024 04/27/2024 08/27/2025
Mark Different MTC 10/18/2027 10/12/2027 10/16/2027 10/16/2027 10/20/2027 02/21/2028 02/09/2028
Chad Gartrell MTC 10/18/2027 10/12/2027 01/19/2028 10/12/2027 01/25/2028 01/28/2026 02/09/2028
Haley Mims MTC 10/18/2027 01/17/2025 12/04/2024 01/17/2025 10/20/2027 02/21/2028 02/09/2028
Patrick Spilman Fort Worth 07/10/2025 03/17/2028 03/19/2026 03/19/2026 10/05/2026
Alex Tillotson MTC 10/18/2027 01/17/2028 01/19/2028 01/19/2028 10/20/2027
Kirk Walker MTC 02/06/2024
Mike Wielputz EMU Savannah 09/15/2023 09/14/2024 09/28/2024 09/28/2024 08/18/2023 11/17/2023 11/17/2023

* Dates indicate the expiration date of current certifications.