0.56 0.57 0.58 0.59 0.6 0.61 0.62 0.631000

1010

1020

1030

1040

1050

1060

1070

1080

1090

Exhibit 7.3Wasatch Front (North) Interchangeability

2011 Daily Averages

OVR to QPCPaysonKern RiverCoalvilleUpper Wobbe Limit (+5%)Lower Wobbe Limit (-5%)

Lower Limit 1309 (-5

%)

Upper Limit 1382 (+5%)

0.570000000000001 0.620000000000001 0.6700000000000011000

1020

1040

1060

1080

1100

1120

1140

Exhibit 7.4Eastern Interchangeability (Wyoming)

2011 Daily Averages

Kent Ranch (Rock Springs)JL-4 (Rock Springs)EvanstonGreen River (#2060)Green River (#2061)Benson Upper Limit Eastern Region Set PointLower Wobbe Limit (-5%)

Lower Limit 1309 (-5%)

1425 (Maximum per Benson Study)

1378 (Eastern Setpoint)

Exhibit 7.5

Exhibit 7.6

Exhibit 7.7

Ryckman Creek Gas Storage ProjectExhibit 7.8

Exhibit 7.9