1) AGC of Texas

2) AgriRock, L.L.C.

3) Arcosa Aggregates Texas, LLC

4) Arcosa LWS, LLC

5) Arcosa Materials, Inc.

6) BFI Waste Services of Texas, LP

7) Colorado Materials, Ltd.

8) Dallas/Fort Worth International Airport

9) Ector County Generation LLC

10) Elgin 104 Holdings LLC

11) FA Victoria 1 LLC

12) First Ammonia LLC

13) Florence 160 Dev LLC

14) Florence FM 970 Ventures, LLC

15) Flying W Properties, Ltd.

16) Fort Bend County Municipal Utility District No. 292

17) Heartland Quarries LLC

18) HillCo Partners, LLC

19) HTX Utility Solutions LLC

20) Hunter Industries Ltd.

21) Jewett Mine LLC

22) Jimmy Evans Company Inc.

23) Jimmy Evans Company, LTD.

24) JTX Land Holdings LLC

25) Lion Elastomers LLC

26) Northwest Williamson County Municipal Utility District No. 3

27) NRG Texas Power, LLC

28) PHR Holdings LLC

29) Pleak 54 Holdings, LLC

30) Republic EES, LLC

31) Republic Services, Inc.

32) Republic Waste Services of Texas, Ltd.

33) RGI Materials Inc.

34) Second Nature Compost LLC

35) Southwest Shipyards L.P.

36) US Ecology Texas, Inc.

37) US Ecology, Inc.

38) Weisman Equipment Company, Ltd.

39) Williamson County Municipal Utility District No. 42

40) Zinc Resources LLC