Nominations for "Standard" On-System Agreements Firm Primary Receipt Point Capacity Written request for Primary Receipt Point Capacity must be submitted, by noon, 5 business days prior to the Nomination deadline All submissions will be subject to PSCo’s approval process Secondary Firm or Interruptible Receipts can be nominated on a daily basis without prior notification - subject to available capacity Nominations will be accepted via: EBB - 1 business day out by 10:30 AM Fax - 2 business days out by 10:30 AM Nominations must include: Receipt Point Acronym Upstream Contract Number

Receipt Point Acronym Receipt Point Name Pipeline LTW Little Wolf Wyoming Interstate Company OWL Owl Creek Wyoming Interstate Company WNG Williams Williams Gas Pipelines Company LPM Lodgepole Colorado Interstate Gas TPR Trailblazer Trailblazer Pipeline WGP WestGas InterState WestGas InterState Pipeline To be announced Rockport KN Interstate FVV Fort St. Vrain Valve Set Public Service Company

Nominations for "Stand-Alone" On-System Agreements Firm Primary Receipt Point Capacity Written request for Primary Receipt Point Capacity must be submitted, by noon, 5 business days prior to the Nomination deadline All submissions will be subject to PSCo’s approval process Secondary Firm or Interruptible Receipts can be nominated on a daily basis without prior notification - subject to available capacity Nominations will be accepted by: Fax - 1 business day out by 10:30 AM Nominations must include: Receipt Point Acronym Upstream Contract Number Volume and Contract Numbers for deliveries downstream of FVV (Fort St. Vrain Valve Set) Nominations for total Receipt Dth must equal the nominations for total Dth delivered at the FVV Delivery Point (there is no fuel deduction on Front Range Pipeline, and no imbalances will be allowed) Ranking List for Curtailments or Interruptions In lieu of Ranking List - Allocations will be prorated based on Nominations

Receipt Point Acronym Receipt Point Name Pipeline LTW Little Wolf Wyoming Interstate Company OWL Owl Creek Wyoming Interstate Company WNG Williams Williams Gas Pipelines Company LPM Lodgepole Colorado Interstate Gas TPR Trailblazer Trailblazer Pipeline WGP WestGas InterState WestGas InterState Pipeline To be announced Rockport KN Interstate