Questar Southern Trails Pipeline Company

Original Volume No. 1

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Effective Date: 01/23/2006, Docket: RP06-154-000, Status: Effective

Second Revised Sheet No. 57 Second Revised Sheet No. 57 : Effective

Superseding: First Revised Sheet No. 57

GENERAL TERMS AND CONDITIONS

site no later than 15 minutes prior to the respective deadline specified in

NAESB Standard 5.3.2. Such received offer, if determined to be valid, will be

posted as an offer and will be available for bidding by the posted-by deadline

and start of bidding time specified (for the received business day) in NAESB

Standard No. 5.3.2 or the releasing shipper's specified business day (if later

than the received business day). Southern Trails shall accept and process

uploads of capacity release bids from potential acquiring shippers (or their

authorized third-party service provider), provided the bid is time-stamped as

leaving control of the bidder no later than 2:00 p.m. of the applicable

deadline day and is received at Southern Trail's designated site by 2:15 p.m.

For pre-arranged capacity release offers, not requiring a bid period,

both the offer and the bid confirmation must be received to be valid.

Southern Trails shall accept and process uploads of capacity release bids from

potential acquiring Shippers (or their authorized third-party service

provider), provided the bid is time-stamped as leaving control of the bidder

no later than the respective deadline as specified in NAESB Standard No.5.3.2

and is received at Southern Trails' designated site no later than 15 minutes

after such deadline. Such timely bid, if determined to be valid, will be

evaluated by Southern Trails for the purpose of identifying the winning bidder

associated with the offer upon which the bid was made.

(c) Replacement Shippers may submit a nomination at the time the

released capacity is acquired.

(d) When capacity is released and awarded on an intra-day cycle,

it is the responsibility of the releasing Shipper and the replacement Shipper

to ensure that nominations for a given day do not exceed the contract Reserved

Daily Capacity (RDC). Any quantities nominated in excess of the RDC specified

in the applicable transportation or storage service agreements, will be

treated as Unauthorized Overrun unless approved by Southern Trails. Scheduled

quantities in excess of the RDC will be treated as Authorized Overrun.

(e) Southern Trails shall reject and Shipper will be required

to withdraw, upon notice by Southern Trails, capacity-release offers

reflecting conditions that do not conform to Southern Trails' tariff. A new

bid period will be