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Portland Natural Gas Transmission System   Original Sheet No. 318 : Effective
FERC Gas Tariff
Portland Natural Gas Transmission System


                   GENERAL TERMS AND CONDITIONS (Continued)
   
  5.   QUALITY OF GAS
   
       5.1 Heating Value.  The Gas to be delivered to Transporter at the
Receipt Point(s) and made available to or on behalf of Shipper at the Delivery
Point(s) under this Tariff shall be Gas having a Total Heating Value of not
less than 967 BTU per Cubic Foot, and not more than 1100 BTU per Cubic Foot,
unless Transporter and Shipper otherwise agree.
   
       5.2 Freedom from Objectionable Matter.  The Gas to be made available
to Transporter at the Receipt Point(s) and made available to or on behalf of
Shipper at the Delivery Point(s) under this Tariff shall be commercially free
(at prevailing pressure and temperature) from objectionable odors, dust and
other solid, liquid or gas matters which might interfere with its
merchantability or cause injury to or interference with proper operation of
the lines, regulators, meters or other appliances through which it flows, and
shall not contain levels of the following contaminants higher than specified
below:
   
            (a)  Sulfur/Hydrogen Sulfide
   
               Not more than twenty (20) grains of total sulfur nor more
               than one-fourth (1/4) grain of hydrogen sulfide per one hundred
               (100) Cubic Feet;
   
            (b)  Oxygen
   
               Not more than two-tenths of one percent (0.2%) by volume of
               oxygen, and Shipper shall make every reasonable effort to
               keep the Gas free of oxygen;
   
            (c)  Carbon Dioxide and Nitrogen
   
               Not more than four percent (4%) by volume of a combined total
               of carbon dioxide and nitrogen components; provided, however,
               that the total carbon dioxide component shall not exceed
               three percent (3%) by volume;
   
            (d)  Water
   
               Shall not contain more than seven pounds (7 lbs.) of water per
               MMcf.







Issued by: David J.Haag, Rates And Tariff Specialist
Issue date: 07/28/06 Effective date: 09/01/06