Questar Overthrust Pipeline Company

Second Revised Volume No. 1-A

Effective Date: 12/15/2007, Docket: RP08- 71-000, Status: Effective

First Revised Sheet No. 90 First Revised Sheet No. 90 : Effective

Superseding: Original Sheet No. 90

GENERAL TERMS AND CONDITIONS

If required to maintain operational stability and system integrity,

Overthrust will adjust all receipts and deliveries on its system, even if

shippers are within the ± 10% imbalance tolerance limits.

Adjustments at each transmission transfer meter will be made according

to the affected Shipper's operational balancing agreement (OBA) or pre-

determined allocation arrangement (PDA) with operators upstream of

Overthrust's transmission system. Absent written notice to Overthrust of an

OBA or PDA reflecting agreement of all affected Shippers' deliveries of gas

to Overthrust at a given transfer meter, adjustments will be made pro rata

according to each Shipper's scheduled daily nomination. Overthrust must be

notified immediately of any changes to an existing OBA or PDA. Shipper shall

provide Overthrust a copy of any document effecting changes to an OBA or PDA

immediately upon execution.

16.2 Monthly Balancing.

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

receipts (receipts less gas used, lost, gained or unaccounted-for gas) and

deliveries within the ± 10% imbalance tolerance.

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

receipt or delivery volumes at each MAP point shall be allocated according to

the upstream or downstream operator's operational balancing agreement (OBA)

or pre-determined allocation (PDA). Absent an OBA or PDA, volumes will be

allocated pro rata based on each Shipper's scheduled nomination.

at each MAP 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) Overthrust 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 § 17 of these General Terms and Conditions.