Authorized Overrun, Secondary Firm and Interruptible
      Transport<BR>
      October 22, 1998
      <UL align=justify>
	<LI>
	  <P align=justify>
	  Unless a discounted rate has been bid by Shipper and accepted by PSCo, all
	  Authorized Overrun, Secondary Firm and Interruptible gas nominated through
	  the Front Range Pipeline will be charged the surcharge posted on the EBB.
	  This notice will be posted four Business Days prior to the beginning of the
	  month for which the rate will be effective.
	<LI>
	  <P align=justify>
	  Shippers may bid for discounted Authorized Overrun (TF-FRP service in conjunction
	  with a Primary Firm commitment), Secondary Firm (TF-FRP service where no
	  Primary Firm commitment exists), or Interruptible (TI-FRP service) service.
	  The Capacity charge for Primary Firm TF-FRP service is not discountable.
	<LI>
	  <P align=justify>
	  Any bid for discounted transportation must be submitted by the Shipper by
	  no later than noon, five business days prior to the beginning of the month.
	  PSCo will either accept or deny the bid by the next business day following
	  its receipt. Any other requests for discounted service will be evaluated
	  on a case by case basis.
	<LI>
	  <P align=justify>
	  Bids for discounted transportation must be submitted using the form provided
	  by PSCo, and signed by an authorized representative.
	<LI>
	  <P align=justify>
	  Shippers submitting a bid for discounted transportation may specify a load
	  factor for which they are willing to commit, which, if accepted, will establish
	  the floor upon which charges will be based.
	<LI>
	  <P align=justify>
	  Bids will be evaluated based on the value of the rate and minimum load factor
	  offered.
	<LI>
	  <P align=justify>
	  Service may commence under a new contract during a month, provided sufficient
	  capacity exists and the service does not "bump" flowing gas. However, Capacity
	  Charges for Primary Firm service will be billed on a full-month basis.
	<LI>
	  <P align=justify>
	  A Posting will be placed on the EBB Stating:
	  <OL>
	    <LI>
	      <P align=justify>
	      Parties wishing to submit a bid for discounted transportation on the Front
	      Range Pipeline must submit a bid to their Transportation Representative by
	      no later than noon, 5 business days prior to the beginning of the month.
	    <LI>
	      <P align=justify>
	      Bids will be accepted or denied by the end of the 4<SUP>th</SUP> Business
	      Day prior to the beginning of the month.
	  </OL>
      </UL>
      <P>
      Shippers will pay the posted commodity rate for Authorized Overrun, Secondary
      Firm and Interruptible transportation services (up to the maximum commodity
      rate of $.122/Dth) for all gas nominated and received for transportation
      on the Front Range Pipeline unless a discounted rate has been approved by
      PSCo.