Centra Pipelines Minnesota Inc.

Second Revised Volume No. 2

Effective Date: 10/16/1991, Docket: RP91-136-002, Status: Effective

Original Sheet No. 17 Original Sheet No. 17 : Effective

substantiation be paid, credited or refunded, as the case may be,

within thirty (30) days after the final determination thereof.

SECTION 7 - QUALITY

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7.1 The gas delivered to Centra for transportation hereunder and the

gas conforming to the following specifications:

(a) Shall have a minimum gross heating value of nine hundred

(900) Btu's per cubic foot.

(b) Shall be commercially free (at prevailing pressure and

temperature) from sand, dust, gums, oils, hydrocarbons

liquefiable at temperatures in excess of fourteen degrees

(14.) Fahrenheit at eight hundred (800) psia absolute,

impurities, other objectionable substances which may

become separated from the gas, and other solids and liquids

which will render it unmerchantable or cause injury to or

interference with proper operations of the lines, regulators,

meters or other appliances through which it flows; and shall

not contain any substance not contained in the gas at the

time the same was produced other than traces of those

materials and chemicals necessary for the transportation and