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Applicable Industry Standards

Black Hills Shoshone Pipeline, LLC

Gas Quality Analytical and Calculation Methods and Procedures

Posting Date: November 6, 2015

Procedure / method Related industry standard
Spot or Composite Sample Gas Processors Association (GPA) 2166
Lab Chromatograph GPA 2172, GPA 2145, GPA 2261, GPA 2198, GPA 2286
GPM Calculation GPA 2145
Heating Value Calculation GPA 2145, GPA 2712

Gas Samples Taken Monthly by Black Hills Shoshone Pipeline, 307-527-3971

Calculations / Methods
Real gas, 14.73 psia @ 60o F
Applicable current GPA methods, procedures and constants are used.