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US Army Corps of Engineers
Materials Testing Center

MTC Testing Team Certifications

Name ACI Concrete Field Testing Technician,
Grade 1
ACI Aggregate Testing Technician,
Level 1
ACI Concrete Strength Testing Technician ACI Concrete Laboratory Testing Technician,
Level 1
ACI Aggregate/Soil Base Testing Technician ACI Cement Physical Testing Technician ACI Self-Consolidating Concrete Testing Technician
Thomas Carr 10/16/2023 10/12/2023 10/19/2023 10/18/2023 10/18/2023
Sammy Craig 10/12/2023 11/15/2022
Mark Different
Neal Downey 11/15/2022 11/15/2022 11/15/2022 11/15/2022 02/06/2024
David Duthu
Chad Gartrell 11/15/2022 11/15/2022 07/23/2023 07/23/2023 10/18/2023
Haley Mims 01/17/2025 12/04/2024
Stephen Murrell 11/15/2022 11/15/2022
Barrett Newell
Alex Tillotson 11/15/2022 11/15/2022 11/15/2022 11/15/2022 10/18/2023
Kirk Walker 11/15/2022 11/15/2022 11/15/2022 11/15/2022 02/06/2024
Mike Wielputz

* Dates indicate the expiration date of current certifications.