NORTHERN NATURAL GAS COMPANY                                 2 Substitute First Revised Sheet No. 211
FERC Gas Tariff                                                                           Superseding
Fifth Revised Volume No. 1                                                     Original Sheet No. 211

                                      GENERAL TERMS AND CONDITIONS

                           and then analyzing the sample using a gas chromatograph.

                           On-Site Gas Chromatograph.  On-site chromatograph sampling
                           directly from a representative source and analyzing
                           continuously.

                           System Gas Chromatograph.  Gas chromatograph sampling
                           directly from a representative source and analyzing
                           continuously.  The results are then applied to all other
                           locations on the system that are representative of the sample
                           source.

                      Spot Sampling Frequency.  Mutually agreed upon frequency
                      (monthly, quarterly, etc.)

                      Meter.  Gas delivered by Northern to the Shipper/Purchaser shall be
                      measured by an adequate meter or meters of standard type,
                      installed, operated and maintained by Northern at its sole expense.
                      In the alternative, the responsibility for meter installation,
                      operation and/or maintenance may be as mutually agreed upon between
                      the parties.  When more than one meter is used for measurement of
                      gas delivered to the Shipper/Purchaser, the term "Meter" shall be
                      construed to mean and include all such meters used for that
                      purpose.

                      Receipt and Delivery Point Operator Flow Information Systems.
                      Receipt and Delivery Point Operators may, subject to Northern
                      specifications and at the operators' sole expense, install flow
                      information systems at Northern's facilities sufficient to provide
                      daily flow information.  Such equipment shall be operated and
                      maintained as agreed to between Northern and the Operator.  Receipt
                      and Delivery Point Operators who have installed flow information
                      systems may provide such information to Northern in accordance with
                      the established parameters, for use in compiling daily imbalances
                      and daily service charges, subject to reasonable verification.  To
                      the extent the facilities become outdated and are no longer in
                      compliance with Northern's specifications, the Receipt and Delivery
                      Point Operators shall be so notified by Northern, and may install
                      replacement facilities.  If the replacement facilities are not
                      installed within a reasonable period of time, Northern will
                      discontinue accepting data from the outdated facilities and begin
                      using Northern's data.

                      Equipment Testing.  At reasonable intervals, Northern shall test
                      and adjust to within measurement tolerances all equipment used in
                      making the determination of factors used under the provision of
                      this Section.  Such equipment shall, at all reasonable times, be
                      subject to test or an inspection by a representative of the
                      Shipper/Purchaser in the presence of a representative of Northern.

                      The Shipper/Purchaser shall test, at reasonable intervals, all
                      Shipper/Purchaser equipment used for measurement of gas where such
                      measurement enters into the measurement computations and shall at
                      the time of the tests, adjust such equipment to record accurately.
                      Northern's representative shall have the right to witness such
                      tests, or at reasonable times at Northern's election, to test and
                      inspect such equipment in the presence of the Shipper/Purchaser.

Issued by: Mary Kay Miller, V. P. Rates and Certificates
Issued on: November 18, 1997                                              Effective: November 1, 1995