Thomas, Dean & Hoskins, Inc.
Great Falls,
Montana
View Accreditation Certificate
Peter
Klevberg
1800 River Drive North
Great Falls
,
Montana
59401
Phone: (406) 761-3010
Fax:
peter.klevberg@tdhengineering.com
http://tdhengineering.com
Quality Management System - accredited since 10/26/2007
R18, C1077 (Aggregate), C1077 (Concrete), D3666 (Aggregate), D3666 (Asphalt Mixture), D3740 (Soil), E329 (Aggregate), E329 (Asphalt Mixture), E329 (Concrete), E329 (Soil)
Asphalt Mixture - accredited since 10/26/2007
D2041, D2726, D3203, D3549, D5444, D6307, D6926, D6927
Soil - accredited since 10/26/2007
T99, T180, D698, D1557, D2216, D4318, D6938
Aggregate - accredited since 10/26/2007
C40, C117, C127, C128, C136, C566, C702, D5821
Concrete - accredited since 1/30/2008
C31 (Beams), C31 (Cylinders), C39, C78, C138, C143, C172, C231, C511, C617 (6000 psi and below), C1064, C1231 (7000 psi and below)
Masonry - accredited since 1/30/2008
C511 (Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the testing of Hydraulic Cements and Concretes)
C1019 (Sampling and Testing Grout)
Please note that our accreditations do not include an expiration date. An accreditation only expires when the laboratory fails to comply with our accreditation requirements.
* This information is only valid as of 8/11/2026. Please visit https://aashtoresource.org for current accreditation status.
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