| Lab Number | Lab Name | City | State |
|---|---|---|---|
| 908103 | Grant Garrett Excavating Inc. GarrettX Materials Laboratory | Bentonville | AR |
| 905800 | Grubbs, Hoskyn, Barton, & Wyatt, Inc. Little Rock Laboratory | Little Rock | AR |
| 918716 | Grubbs, Hoskyn, Barton, & Wyatt, LLC dba UES GHBW El Dorado Concrete Laboratory | El Dorado | AR |
| 905700 | Grubbs, Hoskyn, Barton, & Wyatt, LLC. Springdale Laboratory | Springdale | AR |
| 913109 | GTS, Inc. GTS, Inc. - Fayetteville Laboratory | Fayetteville | AR |
| 923523 | GTS, Inc. GTS Fort Smith Laboratory | Fort Smith | AR |