1) CLEAN HARBORS ENVIRONMENTAL SERVICES, INC. d/b/a CLEAN HARBORS

2) ENERGY TRANSFER PARTNERS, L.L.C. d/b/a ENERGY TRANSFER

3) ENVIRONMENTAL FEDERATION OF OKLAHOMA INC. d/b/a EFO

4) LIBERTY UTILITIES CO. d/b/a LIBERTY UTILITIES CO.

5) NEWVIEW OKLAHOMA, INC. d/b/a NEWVIEW OKLAHOMA

6) OPEN FOR BUSINESS OKLAHOMA, LLC d/b/a OPEN FOR BUSINESS OKLAHOMA

7) PUBLIC SERVICE COMPANY OF OKLAHOMA d/b/a AEP-PSO

8) THE PETROLEUM ALLIANCE OF OKLAHOMA, INC. d/b/a OIPA