1. Chaco Plant Cryogenics Plant Compressor Bldg

2. POPRV Deethanizer Propane Suction Valve Deeth Suction Valve C-8112 Piping to Common Flare Header Block Valve PV 8140D Cylinders 1 & 2

3. C-8112

4. POPRV Deethanizer Propane Suction Valve Deeth Suction Valve C-8112 Anderson Greenwood Valve Block Valve PV 8140D Piping to Common Flare Header Cylinders 1 & 2

5. Anderson Greenwood Valve POPRV Back Flow Preventer (not in use at time of explosion)

6. Piping to Common Flare Header POPRV Deethanizer Propane Suction Valve Deeth Suction Valve C-8112 Block Valve PV 8140D Cylinders 1 & 2

7. Piping to Common Flare Header

8. POPRV Deethanizer Propane Suction Valve Deeth Suction Valve C-8112 Compressor Block Valve PV 8140D Piping to Common Flare Header Cylinders 1 & 2 Usual Flow During Operation

9. POPRV Deethanizer Propane Suction Valve Deeth Suction Valve August 13, 1998 - Maintenance C-8112 Block Valve PV 8140D Piping to Common Flare Header Cylinders 1 & 2 Keith & Wayland

10. Piping to Common Flare Header POPRV Deethanizer Propane Suction Valve Deeth Suction Valve C-8112 Block Valve PV 8140D Cylinders 1 & 2 Keith & Wayland August 13, 1998 - Maintenance

11. Cylinders 1 & 2 Keith & Wayland

12. Piping to Common Flare Header POPRV Deethanizer Propane Suction Valve Deeth Suction Valve C-8112 Block Valve PV 8140D Cylinders 1 & 2 Keith & Wayland Urban August 13, 1998 - Maintenance

13. Deeth Suction Valve Urban

14. POPRV Deethanizer Propane Suction Valve Deeth Suction Valve August 13, 1998 – Expected Flow C-8112 Block Valve PV 8140D Piping to Common Flare Header Cylinders 1 & 2 Keith & Wayland Urban

15. POPRV Deethanizer Propane Suction Valve Deeth Suction Valve August 13, 1998 – Actual Flow C-8112 Block Valve PV 8140D Piping to Common Flare Header Cylinders 1 & 2 Keith & Wayland Urban

16. POPRV Deethanizer Propane Suction Valve Deeth Suction Valve C-8112 Block Valve PV 8140D Piping to Common Flare Header Cylinders 1 & 2 Keith & Wayland Urban August 13, 1998 – Actual Flow

17. Piping to Common Flare Header POPRV Deethanizer Propane Suction Valve Deeth Suction Valve C-8112 Block Valve PV 8140D Cylinders 1 & 2 Keith & Wayland Urban August 13, 1998 – Actual Flow

18. End.