exhibit 10j. ( 7 ) rate schedule tf - 1 service agreement amendment contract no. 100058 amendment no. 6 this amendment is made and entered into on february 12, 2008, by and between northwest pipeline gp ( transporter ) and northwest natural gas company ( shipper ). whereas : a transporter and shipper are parties to that certain rate schedule ( tf - 1 ) service agreement dated june 29, 1990 and assigned contract no. 100058 ( agreement ). b transporter and shipper desire to amend the agreement to extend the primary term end date associated with 34, 000 dth / d of contract demand along with the associated mdqs at the collins gulch ( 2200 dths ) green river gathering ( 3187 dths ), ignacio plant ( 7938 dths ), opal plant ( 7925 dths ), shute creek plant ( 6875 dths ) and westgas arkansas ( 5875 dths ) receipt points and mddos at the albany ( 5000 dths ), battle ground ( 100 dths ), gresham ( 11000 dths ), jefferson / scio ( 200 dths ), kelso / beaver ( 3000 dths ), marion ( 100 dths ), molalla ( 1000 dths ), monitor ( 600 dths ), mount angel ( 1000 dths ), north eugene ( 2500 dths ), oregon city ( 2000 dths ) and south eugene ( 7500 dths ) delivery points from september 30, 2009 to september 30, 2044. this contract term extension is being made pursuant to shipper ’ s right of first refusal decision to match the highest competing bid for capacity posted for competitive bid on january 22, 2008 in the all shipper ’ s notices # 08 - 022 and # 08 - 023. c transporter and shipper desire to further amend the agreement to add a non - confirming provision that reflects the current primary term end date associated with the capacity that is not required to be extended and the new primary term end date associated with the capacity shipper matched by exercising its right of first refusal. therefore, in consideration of the premises and mutual covenants set fourth herein, transporter and shipper agree as follows : 1. as of the effective date set forth thereon, the exhibit a attached hereto supercedes and replaces the previously effective exhibit a to the agreement. 2. the additional exhibits noted on the attached exhibit