Exhibit 7.2

0.570000000000001 0.590000000000001 0.610000000000001 0.6300000000000011010

1020

1030

1040

1050

1060

1070

1080

1090

Exhibit 7.3Wasatch Front (North) Interchangeability

2010 Daily Averages

OVR to QPCPaysonCoalvilleKern RiverUpper Wobbe Limit (+5%)Lower Wobbe Limit (-5%)

Specific Gravity

Hea

t Va

lue

(BTU

)

Upper Limit 1382

Lower Limit 1309

0.570000000000001 0.6200000000000011000

1020

1040

1060

1080

1100

1120

1140

Exhibit 7.4Eastern Interchangeability (Wyoming)

2010 Daily Averages

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

Specific Gravity

Hea

t Va

lue

(BTU

) 1425 (Maximum per Benson Study)

1309

1378 (Eastern Setpoint)

Exhibit 7.5

Exhibit 7.6

Exhibit 7.7

Exhibit 7.8

Ryckman Creek Gas Storage ProjectExhibit 7.9