Revision No.___________
                                                  Control No. ______________
   
                                  Appendix A
                    to the Service Agreement No. __________
                            Under ISS Rate Schedule
                                    Between
                 Caledonia Energy Partners, L.L.C. (Caledonia)
                                      And
                      ________________________ (Customer)
                            Dated ________________
   
Maximum Interruptible Storage Capacity (MISC)               ______________
Maximum Daily Injection Quantity (MDIQ)                    ______________
Injection Period:                  from: ________     to:  ___________
Maximum Daily Withdrawal Quantity (MDWQ)               ______________
Withdrawal Period:                 from: ________     to:  ___________
Ratchet Levels:
The quantities of Gas that Customer may inject or withdraw, pursuant to this
ISS Service Agreement shall be determined by the following ratchets, as a
percentage of MDIQ and MDWQ.
Maximum Daily Injection Quantity Subject to the following Ratchets:
  Storage            Storage       MDIQ        Available Daily Injection
 Inventory*         Inventory    Percentage %    Quantity (ADIQ) (Dth)
   
  0   to ____%      _________     _________      ___________________
   
____ to ____ %      _________     _________      ___________________
   
____ to ____ %      _________     _________      ___________________
   
____ to ____ %      _________     _________      ___________________
   
____ to ____ %      _________     _________      ___________________