exv10w13







Exhibit 10.13




Base Contract for Sale and Purchase of Natural Gas



This Base Contract is entered into as of the following date: September 1, 2004. The parties to
this Base Contract are the following:




	 	 	 	 	 	 	 
	SEMPRA ENERGY TRADING CORP.	and	ULTRA RESOURCES, INC.
	58 Commerce Road, Stamford, CT 06902	 	363 N. Sam Houston Pkwy., E., Suite 1200, Houston, TX 77060
	Duns Number: 60-9746565
	 	Duns Number: 07-110-9974

	Contract Number:
	 	Contract Number:

	U.S. Federal Tax ID Number: 13-3653551
	 	U.S. Federal Tax ID Number: 83-0320643

	 
	 	 	 	 	 	 
	Notices:	 	Notices, Confirmations, Invoices and Payments:
	58
Commerce Road, Stamford, CT 06902	 	363 N. Sam Houston Pkwy., E., Suite 1200, Houston, TX 77060
	Attn: Legal Dept.
	 	Attn: Natural Gas Marketing

	Phone: 203 355-5000


	 	Fax: 203 355-5410

	 	Phone: 281.876.0120 x.307

	 	Fax: 281.876.2831

	 
	 	 	 	 	 	 
	Confirmations:	 	 	 	 
	58
Commerce Road, Stamford, CT 06902	 	 	 	 
	Attn: Operations

	 	 	 	 
	Phone: 203 355-5626


	 	Fax: 203 355-6631
	 	 	 	 
	 
	 	 	 	 	 	 
	Invoices and Payments:	 	 	 	 
	58 Commerce Road, Stamford, CT 06902	 	 	 	 
	Attn: Operations

	 	 	 	 
	 	 	 	 	 
	Phone: 203 355-5626


	 	Fax: 203 355-6604
	 	 	 	 
	 
	 	 	 	 	 	 
	Wire Transfer or ACH Numbers (If applicable):	 	Wire Transfer or ACH Numbers (if applicable):
	BANK: JP Morgan Chase
Bank, NY, NY, USA
	 	BANK: Bank One N.A.

	ABA: 021000021 (Swift Code: CHASUS33) (Chips #: 0002)
	 	ABA: 102001017

	ACCT:
323308090

	 	ACCT: 192 648 101

	Other Details: for the acct of Sempra Energy Trading Corp.
	 	Other Details: For the
Account of Ultra Resources, Inc.






This Base Contract incorporates by reference for all purposes the General Terms and Conditions for
Sale and Purchase of Natural Gas published by the North American Energy Standards Board. The
parties hereby agree to the following provisions offered in said General Terms and Conditions. In
the event the parties fail to check a box, the specified default
provision shall apply. Select
only one box from each section:




	 	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 
	 	Section 1.2

Transaction 

Procedure

	þ
o


	Oral (default) 
Written
	 	 	Section 7.2

Payment Date
	þ

o	25th
Day of Month following Month of
delivery (default) 

_____ Day of Month following Month of delivery	 
	 	 	 	 	 	 
	 	Section 2.5

Confirm 

Deadline

	þ
o
	2 Business Days after receipt (default)

_____ Business Days after receipt
	 	 	Section 7.2

Method of 

Payment
	þ
o
o
	Wire transfer (default) 

Automated Clearinghouse
Credit (ACH)
Check	 
	 	 	 	 	 	 
	 	Section 2.6

Confirming 

Party

	o
o
þ	Seller (default)

Buyer
Sempra Energy Trading
Corp



	 	 	Section 7.7

Netting
	þ
o	Netting applies (default)

Netting does not apply	 
	 	 	 	 	 	 
	 	Section 3.2
Performance
Obligation

	þ
o	Cover Standard (default) 
Spot Price Standard
	 	 	Section 10.3.1

Early Termination 

Damages
	þ
o	Early Termination Damages Apply (default)

Early Termination Damages Do Not Apply	 
	 	 	 	 	 	 	 	 
	 	Note: The following Spot Price Publication applies to both of
the immediately preceding.	 	 	Section 10.3.2

Other Agreement 

Setoffs	þ
o	Other Agreement Setoffs Apply (default)

Other Agreement Setoffs Do Not Apply	 
	 	 	 	 	 	 	 	 
	 	Section 2.26

Spot Price 

Publication

	þ	Gas Daily Midpoint (default)
	 	 	Section 14.5

Choice Of Law
	 	
New York

	 
	 	 	 	 	 	 
	 	Section 6

Taxes

	þ

o	Buyer Pays At and After Delivery Point

(default)
Seller Pays Before and At
Delivery Point
	 	 	Section 14.10

Confidentiality
	þ
o	Confidentiality applies (default)

Confidentiality does not apply	 
	 	 	 	 	 	 
	 	þ  Special Provisions Number of sheets attached: 3	 
	 	o  Addendum(s):
	 
	 	 
	 	 	 	 	 	 	 	 
	 	 	 	 	 	 




IN WITNESS WHEREOF, the parties hereto have executed this Base Contract in duplicate.




	 	 	 	 	 	 	 	 
	SEMPRA ENERGY TRADING CORP.

Party Name 
 	 	ULTRA RESOURCES, INC.
Party Name
 	 
	 
	By  	/s/
Mara Kent
 	 	By  	/s/
Stuart Nance 	 
	 	Name:  	Mara Kent 	 	 	Name:  	Stuart Nance 	 
	 	Title:  	Vice President 	 	 	Title:  	Director 	 






			
	 	 	 
	 
	Copyright © 2002 North American Energy Standards Board, Inc. 

All Rights Reserved
	 	NAESB Standard 6.3.1

April 19, 2002