Southwestern Testing Laboratories, L.L.C. dba STL Engineers
Dallas,
Texas
View Accreditation Certificate
Shane
Tandy
535 Regal Row
Dallas
,
Texas
75247
Phone: (214) 223-4270
Fax: (214) 630-3898
shane.tandy@stlengineers.com
https://http://www.stlengineers.com
Quality Management System - accredited since 4/13/2005
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 12/1/2022
R47, R97, T166, T209, T269, T312, T329, D979, D2041, D2726, D3203, D3549, D3665, D6925
Soil - accredited since 4/13/2005
R58, R74, T88, T89, T90, T99, T100, T134, T180, T191, T193, T208, T216, T265, T289, T296, T310, D421, D422, D558, D698, D854, D1140, D1556, D1557, D1883, D2166, D2216, D2435, D2487, D2488, D2850, D4318, D4546, D4643, D4718, D4972, D6938
Aggregate - accredited since 3/4/2008
R90, T96, T104, T112, T176, T255, C29, C40, C88, C117, C127, C128, C131, C136, C142, C535, C566, C702, D75, D2419, D4791
Concrete - accredited since 8/9/2005
C31 (Beams), C31 (Cylinders), C39, C42 (Testing Drilled Cores of Concrete), C78, C138, C143, C172, C173, C192, C231, C511, C617 (6000 psi and below), C1064, C1231 (7000 psi and below), C1542, C1611
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 10/27/2026. Please visit https://aashtoresource.org for current accreditation status.
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