Midwest Gas Storage, Inc.

First Revised Volume No. 1

Effective Date: 05/15/1994, Docket: CP90-454-004, Status: Effective

Original Sheet No. 521 Original Sheet No. 521 : Effective

(a) shall be commercially free from dust or other solid or

liquid matter which might interfere with its

merchantability or cause injury to or interference

with proper operation of the lines, regulators, meters

and other equipment of Midwest.

(b) shall not contain more than one (1) grain of hydrogen

sulfide per one hundred (100) cubic feet of Gas, as

determined by methods prescribed in Standards of Gas

Service, Circular of the National Bureau of Standards,

No. 405, page 134 (1934 edition), and shall be

considered free from hydrogen sulfide if a strip of

white filter paper, moistened with a solution

containing five percent (5%) by weight of lead

acetate, is not distinctly darker than a second paper

freshly moistened with the same Solution, after the

first paper has been exposed to the Gas for one and

one-half (1-1/2) minutes in an apparatus of approved

form, through which the Gas is flowing at the rate of

approximately five (5) cubic feet per hour, the Gas

from the jet not impinging directly upon the test

paper; or the H2S content may be determined by an

instrument of approved type and by approved methods

agreeable to the parties;

total sulfur (including the sulfur in any hydrogen

sulfide and mercaptans) per one hundred (100) cubic

feet of Gas;

(d) shall not at any time have an oxygen content in excess

of 50 parts per million, and the parties hereto shall

make every reasonable effort to keep the Gas free of

oxygen;

(e) shall not contain as nearly as practicable any free

water nor contain more than seven (7) pounds of water

vapor per million cubic feet of Gas;

(f) shall not contain more than two percent (2%) by volume

of carbon dioxide;