Exhibit 10.1

FIRST AMENDMENT
TO
GULF COAST/ROCKIES/SAN JUAN PACKAGE
PURCHASE AGREEMENT
 
This First Amendment to Gulf Coast/Rockies/San Juan Package Purchase Agreement
(this “First Amendment”) is dated effective as of June 1, 2007, by and between
Dominion Exploration & Production, Inc., a corporation organized under the Laws
of Delaware (“DEPI”), Dominion Energy, Inc., a corporation organized under the
Laws of Virginia (“DEI”), Dominion Oklahoma Texas Exploration & Production,
Inc., a corporation organized under the Laws of Delaware (“DOTEPI”), Dominion
Reserves, Inc., a corporation organized under Laws of Virginia (“Reserves”),
LDNG Texas Holdings, LLC, a limited liability company organized under the laws
of Oklahoma (“LDNG”) and DEPI Texas Holdings, LLC, a limited liability company
organized under the laws of Delaware (“DEPI Texas”) (collectively “Sellers”),
and XTO Energy Inc., a company organized under the Laws of Delaware
(“Purchaser”).  Sellers and Purchaser are sometimes referred to collectively as
the “Parties” and individually as a “Party.”
 
RECITALS:
 
The Parties have entered into a Gulf Coast/Rockies/San Juan Package Purchase
Agreement dated as of June 1, 2007 (the “Agreement”), providing for the sale by
Sellers to Purchaser of the Shares and the Additional Assets.
 
The Parties desire to amend the Agreement to clarify the treatment of several
matters, as set forth herein.
 
NOW, THEREFORE, in consideration of the premises and of the mutual promises,
representations, warranties, covenants, conditions and agreements contained
herein, and for other valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the Parties agree as follows:
 
1.           Definitions.  Capitalized terms used but not otherwise defined
herein shall have the meaning given to those terms in the Agreement.
 
2.           Amendments.  The Agreement is hereby amended as follows:
 
a.           In Section 2.2(c), the term “seventeen (17) Business Days after the
date of this Agreement” is replaced with “twenty-five (25) Business Days after
the date of this Agreement, and the term “schedules” in the third sentence is
replaced with “schedules that include DEPI’s ten digit property numbers.”
 
b.           In Section 2.2(d), the text prior to the colon is revised to read:
 
Within seven (7) Business Days after DEPI’s receipt of the schedules required
under Section 2.2(c), Sellers shall prepare and deliver to Purchaser, using and
based upon the best information available to Sellers, a schedule setting forth
the following items:
 

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c.         In Section 2.3(h)(iii), the text prior to the semi-colon is revised
to read:
 
    Increased by the amount that would be calculated on the Interest Unadjusted
Purchase Price, at the Agreed Rate, for the period from but excluding August 2,
2007 through and including the Closing Date;
 
d.        In Section 3.5(a), the date in the first sentence is changed to
September 3, 2007.
 
e.         In Section 8.1, the date in the first sentence is changed to July 31,
2007.
 
f.         In Section 8.4(b), the term “Purchaser’s sixty (60) day review
period” is replaced with “Purchaser’s ninety (90) day review period”.
 
g.        In Section 12.5(b), the reference in the last sentence to Section
12.1(e) is deleted.
 
h.        On Schedule 4.11, the following items are deleted:
 
 
(1)
Consents to Assign – Land Contracts (Non-Leases) - Contract Number AR 41410002

 
 
(2)
Consents to Assign – Land Contracts (Non-Leases) - Contract Number 303480

 
 
(3)
Consents to Assign – Land Contracts (Non-Leases) - Contract Number 304381

 
 
(4)
Consents to Assign – Land Contracts (Non-Leases) - Contract Number 314086 (two
entries)

 
 
(5)
Preferential Purchase Rights – Land Contracts - Contract Number 314559

 
 
(6)
Preferential Purchase Rights – Land Contracts - Contract Number 314602

 
 
(7)
Preferential Purchase Rights – Land Contracts - Contract Number 314086 (two
entries)

 
 
(8)
Preferential Purchase Rights – Land Contracts - Contract Number 314173 (four
entries)

 
 
(9)
Preferential Purchase Rights – Land Contracts - Contract Number 311633 (two
entries)

 
 
(10)
Preferential Purchase Rights – Land Contracts - Contract Number 311637 (two
entries)

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(11)
Preferential Purchase Rights – Land Contracts - Contract Number 312823 (two
entries)

 
i.           On Schedule 4.11, the following items are added:
 
 
(1)
Preferential Rights to Purchase – Land Contracts

 
Contract Number:
5137
Contract Description:
Cushing Purchase and Sale Agreement
Group:
JOA
File Type:
Purchase/Sale Agreement
Prospect Name:
Cushing
Prospect Code:
PRTX034
State:
TX
County:
Rusk
Dominion Party:
DEPI
Area:
Eastern
   
Contract Number:
304317
Contract Description:
Kutz West Field Prospect JOA
Group:
JOA
File Type:
Joint Operating Agreement
Prospect Name:
Kutz West Field
Prospect Code:
PR300000
State:
NM
County:
San Juan
Dominion Party:
DOTEPI
Area:
Western
   
Contract Number:
314707
Contract Description:
Kings Canyon Farmout Sec 32-10S-19E
Group:
JOA
File Type:
Farmout Agreement
Prospect Name:
Kings Canyon
Prospect Code:
PRUT4012
State:
UT
County:
Uintah
Dominion Party:
DEPI
Area:
Western
   
Contract Number:
314708
Contract Description:
Kings Canyon Farmout Sec 36-10S-18E
Group:
JOA
File Type:
Farmout Agreement
Prospect Name:
Kings Canyon
Prospect Code:
PRUT4012
State:
UT
County:
Uintah
Dominion Party:
DEPI
Area:
Western

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(2)
Consents to Assign – Land Contracts (Non Leases)

 
Contract Number:
304034
Contract Description:
Cranz/Goodrich/American F/O
Group:
JOA
File Type:
Farmout Agreement
Prospect Name:
Cranz
Prospect Code:
 
State:
TX
County:
Lavaca
Dominion Party:
DOTEPI
Area:
     
Contract Number:
304036
Contract Description:
Everest Letter Agreement
Group:
JOA
File Type:
Letter Agreement
Prospect Name:
Cranz
Prospect Code:
 
State:
TX
County:
Lavaca
Dominion Party:
DOTEPI
Area:
     

j.           On Schedule 8.4(D), the bank account information for Sellers is
hereby replaced with the following:
 
JP Morgan Chase Bank
               Account Holder:  Dominion Resources, Inc.
               Account No. 144053865
              ABA No. 021-000-021

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k.           On Schedule 13.5, Guarantees to be Replaced, in the Guarantee
section, the Guarantee of which Oasis Pipeline, L.P. is the Beneficiary is
deleted and replaced with the following Guarantee:
 
Guarantor:                              Consolidated Natural Gas Company
Primary Obligor:                    Dominion Exploration & Production, Inc.
Guarantee Date:                    March 28, 2003
Beneficiary:                           SWEPI LP
 
l.           In Section 2.2 of Exhibit F, the form of DEPI/Purchaser Transition
Services Agreement, the first sentence is rewritten to read as follows:
 
At all times during the performance of Purchaser Services by Purchaser, all
persons performing such Purchaser Services who shall be in the employ and/or
under the control of Purchaser, the Companies or their Affiliates (including
agents, contractors, temporary employees and consultants) shall be independent
from DEPI and not employees of DEPI and shall not be entitled to any payment,
benefit or perquisite directly from DEPI on account of such Purchaser Services,
provided, however, certain Company Onshore Employees and Managing Directors that
accept employment and remain employed with Purchaser may participate in the
Company’s U.S. Benefit Plans to the extent such participation is permitted under
the Dominion Pension Plan and the Dominion Retiree Health and Welfare
Plan.  Purchaser will not be required to provide any Purchaser Services the
provision of which would violate any Laws or contract.  Purchaser will use its
commercially reasonable efforts as necessary to secure consents and/or approvals
of vendors, lessors and licensors relating to the Purchaser Services provided by
it or its Affiliates.
 
m.           A new Section 2.7 is added in Exhibit F, the form of DEPI/Purchaser
Transition Services Agreement, reading as follows:
 
Section 2.7 Information to DEPI.  Within 30 days following the 180th day after
the Closing Date, Purchaser shall provide DEPI notice of (i) all Company Onshore
Employees and Managing Directors that have remained employed by Purchaser from
the date of employment with Purchaser through the 180th day from Closing,
measured from and including the Closing Date, and (ii) any Company Onshore
Employees or Managing Directors who accepted employment with Purchaser pursuant
to Section 10.2(a) or (b) of the Purchase Agreement but who were not employed by
Purchaser for the entire 180 day period, measured from and including the Closing
Date, together with an explanation as to whether their departure was voluntary,
involuntary without cause, or involuntary with cause.
 
3.           Ratification.  Except as amended by this First Amendment, the
Agreement remains in full force and effect in accordance with its terms.

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4.           Governing Law, Venue, Jurisdiction and Service of
Process.  Sections 13.8 and 13.9 of the Agreement are hereby incorporated into
this First Amendment by reference as if set out in full herein.
 
5.           Counterparts.  This First Amendment may be executed in
counterparts, each of which shall be deemed an original instrument, but all such
counterparts together shall constitute but one agreement.  Delivery of an
executed counterpart signature page by facsimile is as effective as executing
and delivering this First Amendment in the presence of other Parties to this
Agreement.
 

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IN WITNESS WHEREOF, this First Amendment has been signed by each of the Parties
as of the date first above written.
 
SELLER:
DOMINION EXPLORATION & PRODUCTION, INC.
 
 
By:    /s/G. Scott Hetzer
Name:   G. Scott Hetzer
Title:     Senior Vice President and Treasurer
 
SELLER:
DOMINION ENERGY, INC.
 
 
By:    /s/G. Scott Hetzer
Name:   G. Scott Hetzer
Title:     Senior Vice President and Treasurer
 
SELLER:
DOMINION OKLAHOMA TEXAS EXPLORATION & PRODUCTION, INC.
 
 
By:    /s/G. Scott Hetzer
Name:   G. Scott Hetzer
Title:     Senior Vice President and Treasurer
 
SELLER:
DOMINION RESERVES, INC.
 
 
By:    /s/G. Scott Hetzer
Name:   G. Scott Hetzer
Title:     Senior Vice President and Treasurer
 
SELLER:
LDNG TEXAS HOLDINGS, LLC
 
 
By:    /s/G. Scott Hetzer
Name:   G. Scott Hetzer
Title:     Senior Vice President and Treasurer
 
SELLER:
DEPI TEXAS HOLDINGS, LLC
 
 
By:    /s/G. Scott Hetzer
Name:   G. Scott Hetzer
Title:     Senior Vice President and Treasurer
 
PURCHASER:
XTO ENERGY INC.
 
 
By:    /s/Vaughn O. Vennerberg, II
Name:   Vaughn O. Vennerberg, II
 Title:  Senior Executive Vice President and Chief of Staff