1) AGC of Texas

2) Arcosa Materials, Inc.

3) BFI Waste Services of Texas, LP

4) C&D Waste, Ltd

5) Colorado Materials, Ltd.

6) Dallas/Fort Worth International Airport

7) Ector County Generation LLC

8) First Ammonia LLC

9) Flying W Properties, Ltd.

10) HillCo Partners, LLC

11) Hunter Industries Ltd.

12) Indorama Ventures Oxides LLC

13) Lion Elastomers LLC

14) NRG Texas Power, LLC

15) PHR Holdings LLC

16) Pioneer Natural Resources USA, Inc.

17) Republic EES, LLC

18) Republic Services, Inc.

19) Republic Waste Services of Texas, Ltd.

20) RGI Materials Inc.

21) Rio Perla Properties, L.P.

22) Second Nature Compost LLC

23) Southwest Shipyards L.P.

24) Summit Next Gen, LLC

25) US Ecology, Inc.

26) Weisman Equipment Company, Ltd.

27) Zinc Resources LLC