| ELK CITY OKLAHOMA PIPELINE, L.P. |
| By: | Elk City Oklahoma GP, LLC | |
| | its general partner | |
| By: | Atlas Pipeline Mid-Continent LLC, its sole member | |
| By: | Atlas Pipeline Operating Partnership, L.P., its sole member | |
| By: | Atlas Pipeline Partners GP, LLC, its general partner | |
| | | |
| ATLAS ARKANSAS PIPELINE LLC | |
| By: | Atlas Pipeline Mid-Continent LLC, its sole member | |
| By: | Atlas Pipeline Operating Partnership, L.P., its sole member | |
| By: | Atlas Pipeline Partners GP, LLC, its general partner | |
| | | |
| MID-CONTINENT ARKANSAS PIPELINE, LLC | |
| By: | Atlas Pipeline Mid-Continent LLC, its sole member | |
| By: | Atlas Pipeline Operating Partnership, L.P., its sole member | |
| By: | Atlas Pipeline Partners GP, LLC, its general partner | |
| | | |
| NOARK PIPELINE SYSTEM, LIMITED PARTNERSHIP | |
| By: | Atlas Arkansas Pipeline LLC and Mid- Continent Arkansas Pipeline, LLC, its general partners | |
| By: | Atlas Pipeline Mid-Continent LLC, their sole member | |
| By: | Atlas Pipeline Operating Partnership, L.P., its sole member | |
| By: | Atlas Pipeline Partners GP, LLC, its general partner | |
| | | |
| OZARK GAS GATHERING, L.L.C. | |
| By: | NOARK Pipeline System, Limited Partnership, its sole member | |
| By: | Atlas Arkansas Pipeline LLC and Mid- Continent Arkansas Pipeline, LLC, its general partners | |
| By: | Atlas Pipeline Mid-Continent LLC, their sole member | |
| By: | Atlas Pipeline Operating Partnership, L.P., its sole member | |
| By: | Atlas Pipeline Partners GP, LLC, its general partner | |
| | |
| OZARK GAS TRANSMISSION, L.L.C. |
| By: | NOARK Pipeline System, Limited Partnership, its sole member | |
| By: | Atlas Arkansas Pipeline LLC and Mid- Continent Arkansas Pipeline, LLC, its general partners | |
| By: | Atlas Pipeline Mid-Continent LLC, their sole member | |
| By: | Atlas Pipeline Operating Partnership, L.P., its sole member | |
| By: | Atlas Pipeline Partners GP, LLC, its general partner | |
| | |
| NOARK ENERGY SERVICES, L.L.C. |
| By: | NOARK Pipeline System, Limited Partnership, its sole member | |
| By: | Atlas Arkansas Pipeline LLC and Mid- Continent Arkansas Pipeline, LLC, its general partners | |
| By: | Atlas Pipeline Mid-Continent LLC, their sole member | |
| By: | Atlas Pipeline Operating Partnership, L.P., its sole member | |
| By: | Atlas Pipeline Partners GP, LLC, its general partner | |
| | | |
| By: | /s/ Michael L. Staines | |
| | Name: Michael Staines | |
| | Title: President and Chief Operating Officer | |