Questar Southern Trails Pipeline Company

Original Volume No. 1

Effective Date: 10/14/2008, Docket: CP99-163-004, Status: Effective

First Revised Sheet No. 86 First Revised Sheet No. 86

Superseding: Original Sheet No. 86

GENERAL TERMS AND CONDITIONS

be made pro rata according to each Shipper's scheduled daily nomination.

No imbalance penalty will be imposed when a prior period adjustment

applied to the current period causes or increases a current month penalty.

15.3 Monthly Balancing.

(a) A Shipper must maintain a monthly balance between net

receipts (receipts less lost and unaccounted-for gas) and deliveries within

the ± 2.5% imbalance tolerance.

(b) For the determination of monthly imbalances, Shippers'

receipt or delivery volumes shall be allocated according to the upstream or

downstream operator's OBA. Absent an OBA or PDA, volumes will be allocated

pro rata based on each Shipper's scheduled nomination.

at each receipt or delivery point will be determined according to the OBA or

PDA in place at the time the volumes were received or delivered. Absent an OBA

or PDA, adjustments will be pro rata according to each Shipper's daily

scheduled nomination.

(d) Southern Trails will make monthly imbalance information

available to all Shippers through Questline on or before the 9th business day

of each month following the month during which gas was transported. An

imbalance statement will be tendered to Shipper with Shipper's monthly bill

issued according to § 16 of these General Terms and Conditions.

(e) At the end of each calendar month where Shipper's net

transportation receipts (receipt Dth less fuel and lost-and-unaccounted-for)

do not equal deliveries on a Dth basis, the following procedures will apply:

(i) Shipper's imbalances under each FT and IT agreement

will be netted together for monthly imbalance calculations. Each month on or

before the 9th business day, Southern Trails will provide imbalance statements

and information on its website indicating the resulting monthly imbalance

incurred in the prior month.

(ii) Following posting of the monthly imbalance for the

prior month, Shippers will then have through the last