ex10_1.htm

Exhibit 10.1

RR2007LP

Garfield County

ASSIGNMENT OF WORKING INTEREST

Wellbore Only

This Assignment of Working Interest ("Assignment") is made and entered into this 21st day of August, 2007 from PETROLEUM DEVELOPMENT CORPORATION, a Nevada Corporation, (herein called "Assignor") to ROCKIES REGION 2007 LIMITED PARTNERSHIP, (herein called "Assignee");

WITNESSETH

Assignor, for the sum of One Dollar ($1.00) and other valuable consideration, the receipt of which is hereby acknowledged, does by these presents GRANT, BARGAIN, SELL, EXCHANGE, CONVEY, ASSIGN, TRANSFER, SET OVER and DELIVER unto Assignee all of the following:

1. The specific undivided interest shown in Exhibit A in respect of each of the oil and gas leases shown in Exhibit A, but only to the extent such leases cover lands and depths necessary for production of the specific oil and gas well identified in Exhibit A. This is intended to be a "wellbore assignment." Assignee shall be entitled to receive that share of production from the well identified in Exhibit A which is attributable to the undivided interest here being assigned, but the Assignee shall have, as a result of this Assignment, no interest whatsoever in any other oil and gas well, whether now existing or hereafter drilled, which may be located on the lands described in Exhibit A or on any land pooled therewith. Assignor expressly excepts from this Assignment and reserves to itself, its successors and assigns, the remainder of the lease and the leasehold oil and gas estate, including (without limitation) the right to produce other wells which are or may be located on the lands described in Exhibit A and lands pooled therewith, without the obligation to account to Assignee for any such other production.

2. The specific undivided interest shown in Exhibit A in all valid unitization, pooling, operating and communitization agreements, declarations and orders involving the leasehold interests here being assigned, but only to the extent that such agreements, declarations and orders relate to the well specifically identified in Exhibit A and in all other respects limited to the manner as set forth in Paragraph 1, above.

3. The specific undivided interest shown in Exhibit A in all valid oil and gas sales, purchase, exchange and processing contracts, but only to the extent that such contracts relate to the well specifically identified in Exhibit A and in all other respects limited in the manner set forth in Paragraph 1, above.

4. The specific undivided interest shown in Exhibit A in all personal property, improvements, lease and well equipment, easements, permits, licenses, servitudes and rights-of-way now owned by Assignor and being used in connection with the operation of the well specifically identified in Exhibit A or in connection with the production, treating, storing, transportation or marketing of oil, gas and other minerals from that well, but in all respects limited in the manner set forth in Paragraph 1, above.

TO HAVE AND TO HOLD the interests described unto Assignee, its successors and assigns, forever.

This Assignment is made without warranties of any type (whether of title, merchantability or fitness for a particular use), either express or implied, but is made with full substitution of Assignee in all covenants and warranties previously given or made by others, but only to the extent of the interests here assigned. Assignor does, however, expressly intend that this Assignment convey any title that Assignor may hereafter acquire to the extent that such after-acquired title may be necessary to fulfill the interests herein assigned.

Assignee shall bear its proportionate share of ail burdens on production now of record and hereby assumes its proportionate share of all other obligations that relate to the well specifically identified in Exhibit A and the production there from.

Both Assignor and Assignee hereby agree to execute and deliver such additional instruments, notices, division orders, transfer orders and other documents as may reasonably be requested by the other, and to do such other acts and things, as may be necessary or convenient to accomplish this Assignment in the manner and to the extent described in Paragraph 1, above.

IN WITNESS WHEREOF, Petroleum Development Corporation has executed and delivered this instrument, with the intention that it shall be effective as of the spud date of the well specifically identified in Exhibit A.

	PETROLEUM DEVELOPMENT CORPORATION
	A Nevada Corporation

	BY: /s/ Deward W. Gerdom
	Deward W. Gerdom
	Vice President

STATE OF WELD	)
	)	TO-WIT:
COUNTY OF COLORADO	)

The foregoing instrument was acknowledged before me this 21st day of August, 2007 by Deward Gerdom, as Vice President for Petroleum Development Corporation, a Nevada Corporation, for and on behalf of the Corporation. He executed the foregoing for the purposes therein contained

	/s/ Carrie Eggleston
	Carrie Eggleston
	Notary Public-	Colorado
		County of Denver
	My Commission expires:	October 12, 2010

After recording, return to:

Petroleum Development Corporation

1775 Sherman Street, Suite 3000

Denver, CO 80203

Ph: 303-860-5800

Exhibit "A"

Garfield County, Colorado

Attached to and made part of that Assignment of Working Interest dated August 21, 2007 by and between

Petroleum Development Corporation and Rockies Region 2007 Limited Partnership

WELL#

WELL NAME

WORKING INT.

TWP

RNG

SEC

BHLQ/Q

SPUD DATE

LEASE #

LESSOR

LESSEE

LEASE DATE

BOOK

PAGE

REC

08011

Chevron 32D-7D

0.99981000

96W

SWNE

1/6/2008

COL00067.000

Chevron U.S.A. Inc.

Petroleum Development Corporation

11/15/2002

1447

573

623086

08010

Chevron 32B-7D

0.99981000

96W

SWNE

1/22/2008

COL00067.000

Chevron U.S.A. Inc.

Petroleum Development Corporation

11/15/2002

1447

573

623086

08009

Chevron 32A-7D

0.99981000

96W

SWNW

2/4/2008

COL00067.000

Chevron U.S.A. Inc.

Petroleum Development Corporation

11/15/2002

1447

573

623086

08012

Chevron 33A-7D

0.99981000

96W

NWSW

2/9/2008

COL00067.000

Chevron U.S.A. Inc.

Petroleum Development Corporation

11/15/2002

1447

573

623086

08013

Chevron 33B-7D

0.99981000

96W

NWSE

2/13/2008

COL00067.000

Chevron U.S.A. Inc.

Petroleum Development Corporation

11/15/2002

1447

573

623086

08004

Chevron 33D-7D

0.99981000

96W

NWSE

2/17/2008

COL00067.000

Chevron U.S.A. Inc.

Petroleum Development Corporation

11/15/2002

1447

573

623086

08008

Chevron 23B-7D

0.99981000

96W

NESW

2/24/2008

COL00067.000

Chevron U.S.A. Inc.

Petroleum Development Corporation

11/15/2002

1447

573

623086

08007

Chevron 23A-7D

0.99981000

96W

NESW

2/28/2008

COL00067.000

Chevron U.S.A. inc.

Petroleum Development Corporation

11/15/2002

1447

573

623086

08006

Chevron 22D-7D

0.99981000

96W

SENW

3/9/2008

COL00067.000

Chevron U.S.A. Inc.

Petroleum Development Corporation

11/15/2002

1447

573

623086

07450

Puckett 31D-25D

0.99981000

97W

NWNE

9/1/2007

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

07446

Puckett 31A-25D

0.99981000

97W

NWNE

9/15/2007

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

07835

Puckett 42A-25D

0.99981000

97W

SENE

10/8/2007

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

07839

Puckett 21D-25D

0.99981000

97W

NENW

10/20/2007

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

07841

Puckett 41D-25D

0.99981000

97W

NENE

10/21/2007

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

07838

Puckett 21C2-25D

0.99981000

97W

NENW

11/1/2007

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

07840

Puckett 41C-25D

0.99981000

97W

NENE

11/13/2007

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

07452

Puckett 32B-25D

0.99981000

97W

SWNE

11/14/2007

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

07738

Puckett 21A-25D

0.99981000

97W

NENW

11/24/2007

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

07455

Puckett 32D-25D

0.99981000

97W

SWNE

11/30/2007

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

08003

Puckett 33D-25D

0.99981000

97W

NWSE

1/20/2008

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

08002

Puckett 33C2-25D

0.99981000

97W

NWSE

2/2/2008

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

07444

Puckett 11D-7D

0.99981000

96W

NWNW

9/18/2007

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

07442

Puckett 11B-7D

0.99981000

96W

NWNW

10/5/2007

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

Page 1 of 2

Exhibit "A"

Garfield County, Colorado

Attached to and made part of that Assignment of Working Interest dated August 21, 2007 by and between

Petroleum Development Corporation and Rockies Region 2007 Limited Partnership

WELL#

WELL NAME

WORKING INT.

TWP

RNG

SEC

BHL Q/Q

SPUD DATE

LEASE #

LESSOR

LESSEE

LEASE DATE

BOOK

PAGE

REC

07440

Puckett 11A-7D

0.99981000

96W

NWNW

10/21/2007

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

07438

Puckett 12A-18D

0.99981000

96W

SWNW

8/24/2007

COL00077.000

Puckett Land Co.

Petroleum Development Corporation

11/15/1999

1164

400

556562

When Recorded Please Return To:

Petroleum Development Corporation

1775 Sherman St., Suite 3000

Denver, CO 80203

Attn: Jenni L. Muller

Page 2 of 2

RR2007LP

Weld County

ASSIGNMENT OF WORKING INTEREST

Wellbore Only

WITNESSETH

1. An undivided 99.981 percent (99.981%) of Assignor's right, title and interest (the "Subject Interest") in the oil and gas leases shown in Exhibit A, but only to the extent such leases cover lands and depths necessary for production of the specific oil and gas well identified in Exhibit A. This is intended to be a "wellbore assignment." Assignee shall be entitled to receive that share of production from the well identified in Exhibit A which is attributable to the undivided interest here being assigned, but the Assignee shall have, as a result of this Assignment, no interest whatsoever in any other oil and gas well, whether now existing or hereafter drilled, which may be located on the lands described in Exhibit A or on any land pooled therewith. Assignor expressly excepts from this Assignment and reserves to itself, its successors and assigns, the remainder of the lease and the leasehold oil and gas estate, including (without limitation) the right to produce other wells which are or may be located on the lands described in Exhibit A and lands pooled therewith, without the obligation to account to Assignee for any such other production.

2. The Subject Interest in all valid unitization, pooling, operating and communitization agreements, declarations and orders involving the leasehold interests here being assigned, but only to the extent that such agreements, declarations and orders relate to the well specifically identified in Exhibit A and in all other respects limited to the manner as set forth in Paragraph 1, above.

3. The Subject Interest in all valid oil and gas sales, purchase, exchange and processing contracts, but only to the extent that such contracts relate to the well specifically identified in Exhibit A and in alt other respects limited in the manner set forth in Paragraph 1, above.

4. The Subject Interest in all personal property, improvements, lease and well equipment, easements, permits, licenses, servitudes and rights-of-way now owned by Assignor and being used in connection with the operation of the well specifically identified in Exhibit A or in connection with the production, treating, storing, transportation or marketing of oil, gas and other minerals from that well, but in all respects limited in the manner set forth in Paragraph 1, above.

TO HAVE AND TO HOLD the interests described unto Assignee, its successors and assigns, forever.

Assignee shall bear its proportionate share of all burdens on production now of record and hereby assumes its proportionate share of all other obligations that relate to the well specifically identified in Exhibit A and the production there from.

	PETROLEUM DEVELOPMENT CORPORATION
	A Nevada Corporation

	BY:	/s/ Deward W. Gerdom
		Deward W. Gerdom
		Vice President

STATE OF WELD	)
	)	TO-WIT:
COUNTY OF COLORADO	)

	/s/ Carrie Eggleston
	Carrie Eggleston
	Notary Public-	Colorado
		County of Denver
	My Commission expires: October 12, 2010

After recording, return to:

Petroleum Development Corporation

1775 Sherman Street, Suite 3000

Denver, CO 80203

Ph: 303-860-5800

Exhibit "A"

Weld County, Colorado

Attached to and made part of that Assignment of Working Interest dated August 21, 2007 by and between Petroleum Development Corporation and Rockies Region 2007 Limited Partnership

WELL #

WELL NAME

WORKING INT.

TWP

RNG

SEC

Q/Q

Spud Date

PDC Lease Number

Lessor

Lessee

Lease Date

Book

Rec

08237

Guttersen 32-6

0.99981000

63W

SWNE

2/7/2008

COL00372.000

John H. Cuykendall and Edith P. Cuykendall

T.S. Pace

2/6/1970

621

1543443

08236

Guttersen 31-6

0.99981000

63W

NWNE

2/13/2008

COL00372.000

John H. Cuykendall and Edith P. Cuykendall

T.S. Pace

2/6/1970

621

1543443

07879

Guttersen 43-6

0.99981000

63W

NESE

8/27/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

07878

Guttersen 33-6

0.99981000

63W

NWSE

9/3/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

07880

Guttersen 44-6

0.99981000

63W

SESE

9/9/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

07877

Guttersen 34-6

0.99981000

63W

SWSE

9/14/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

07875

Guttersen 23-6

0.99981000

63W

NESW

9/20/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

07876

Guttersen 24-6

0.99981000

63W

SESW

9/25/2007

COL00374.000

L F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

07987

Guttersen 8D

0.99981000

63W

SESE

11/2/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

07986

Guttersen 34-8

0.99981000

63W

SWSE

11/7/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

07983

Guttersen 43-8

0.99981000

63W

NESE

11/12/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

07985

Guttersen 44-8

0.99981000

63W

SESE

11/16/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

07984

Guttersen 33-8

0.99981000

63W

NWSE

11/20/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

08035

Guttersen 8C

0.99981000

63W

NWNE

1/2/2008

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

08036

Guttersen 31-8

0.99981000

63W

NWNE

1/9/2008

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

08037

Guttersen 32-8

0.99981000

63W

SWNE

1/15/2008

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

08038

Guttersen 42-8

0.99981000

63W

SENE

1/21/2008

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

08201

Guttersen 33-18

0.99981000

63W

NWSE

1/27/2008

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

08202

Guttersen 43-18

0.99981000

63W

NESE

2/2/2008

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

08239

Guttersen 21-28

0.99981000

63W

NENW

2/19/2008

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

08238

Guttersen 11-28

0.99981000

63W

NWNW

2/25/2008

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

08389

Guttersen 22-28

0.99981000

63W

SENW

3/2/2008

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

08388

Guttersen 12-28

0.99981000

63W

SWNW

3/8/2008

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

Page 1 of 6

Exhibit "A"

Weld County, Colorado

Attached to and made part of that Assignment of Working Interest dated August 21, 2007 by and between Petroleum Development Corporation and Rockies Region 2007 Limited Partnership

WELL#

WELL NAME

WORKING INT.

TWP

RNG

SEC

Q/Q

Spud Date

PDC Lease Number

Lessor

Lessee

Lease Date

Book

Rec

08390

Guttersen 28A

0.99981000

63W

SWNW

3/14/2008

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

71127

Guttersen 30A

0.99981000

63W

NWNW

12/8/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

71124

Guttersen 12-30

0.99981000

63W

SWNW

12/14/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

71126

Guttersen 22-30

0.99981000

63W

SENW

12/20/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

71123

Guttersen 11-30

0.99981000

63W

NWNW

12/26/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

08313

Guttersen 43-31

63W

NESE

3/1/2008

COL00372.000

John H. Cuykendall and Edith P. Cuykendall

T.S. Pace

2/6/1970

621

1543443

08312

Guttersen 33-31

0.99981000

63W

NWSE

3/7/2008

COL00372.000

John H. Cuykendall and Edith P. Cuykendall

T.S Pace

2/6/1970

621

1543443

08314

Guttersen 43-32

0.99981000

63W

NESE

3/17/2008

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

08315

Guttersen 33-32

0.99981000

63W

NWSE

3/22/2008

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

08316

Guttersen 23-33

63W

NESW

3/12/2008

COL00373.000

Champlin Petroleum Company

Amoco Production Company

8/2/1977

806

1727554

08317

Guttersen 24-33

63W

SESW

3/19/2008

COL00373.000

Champlin Petroleum Company

Amoco Production Company

8/2/1977

806

1727554

07903

Guttersen 34-12

0.99981000

64W

SWSE

10/1/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

07900

Guttersen 44-12

0.99981000

64W

SESE

10/8/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

07902

Guttersen 33-12

0.99981000

64W

NWSE

10/14/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

07901

Guttersen 43-12

0.99981000

64W

NESE

10/20/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

07904

Guttersen 12D

0.99981000

64W

SESE

10/27/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

71066

Guttersen 41-13

0.99981000

64W

NENE

11/2/2007

COL00374.000

L F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

71068

Guttersen 13C

0.99981000

64W

SENE

11/9/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

Page 2 of 6

Exhibit "A"

Weld County, Colorado

Attached to and made part of that Assignment of Working Interest dated August 21, 2007 by and between Petroleum Development Corporation and Rockies Region 2007 Limited Partnership

WELL #

WELL NAME

WORKING INT.

TWP

RNG

SEC

Q/Q

Spud Date

PDC Lease Number

Lessor

Lessee

Lease Date

Book

Rec

71070

Guttersen 42-13

0.99981000

64W

SENE

11/17/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

71067

Guttersen 31-13

0.99981000

64W

NWNE

11/25/2007

COL00374.000

L.F Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

71069

Guttersen 32-13

0.99981000

64W

SWNE

12/2/2007

COL00374.000

L.F. Ranch Company

Mel C. Bedinger

7/2/1964

518

1440221

Michael Guttersen and Henrietta Quinn

07268

Kohlhoff 33-2

0.99981000

63W

NWSE

10/2/2007

COL00420.001

Guttersen

Petroleum Development Corporation

10/20/2006

3451368

07269

Kohlhoff 34-2

0.99981000

63W

SWSE

10/12/2007

COL00420.002

Betty L. Campbell, individually

Petroleum Development Corporation

10/20/2006

3459448

Tommy W. Kime and Bobetta A. Kime,

COL00420.003

husband and wife

Petroleum Development Corporation

10/20/2006

3459454

Henry Kohlhoff, as Trustee of the Henry

Kohlhoff Trust for the Benefit of Anne

COL00420.004

Marie Kohlhoff

Petroleum Development Corporation

9/10/2007

3504755

Michael Guttersen and Henrietta Quinn

07273

Kohlhoff 44-2

0.99981000

63W

SESE

10/6/2007

COL00420.001

Guttersen

Petroleum Development Corporation

10/20/2006

3451368

07272

Kohlhoff 43-2

0.99981000

63W

NESE

10/19/2007

COL00420.002

Betty L. Campbell, individually

Petroleum Development Corporation

10/20/2006

3459448

Tommy W. Kime and Bobetta A. Kime,

COL00420.003

husband and wife

Petroleum Development Corporation

10/20/2006

3459454

Henry Kohlhoff, as Trustee of the Henry

Kohlhoff Trust for the Benefit of Anne

COL00420.004

Marie Kohlhoff

Petroleum Development Corporation

9/10/2007

3504755

James W. Rice, as Trustee of the Rice

Family Trust, under the will of William

Page 3 of 6

Exhibit "A"

Weld County, Colorado

Attached to and made part of that Assignment of Working Interest dated August 21, 2007 by and between Petroleum Development Corporation and Rockies Region 2007 Limited Partnership

WELL #

WELL NAME

WORKING INT.

TWP

RNG

SEC

Q/Q

Spud Date

PDC Lease Number

Lessor

Lessee

Lease Date

Book

Rec

08244

Cook 43-20

0.99981000

63W

NESE

2/16/2008

COL00151.001

D. Rice

Petroleum Development Corporation

3/8/2007

3462990

James W. Rice, as Trustee of the Rice

Family Trust, under the will of William

08245

Cook 44-20

0.99981000

63W

SESE

2/20/2008

COL00151.001

D. Rice

Petroleum Development Corporation

3/8/2007

3462990

Pim Lynn Nesbitt as Trustee of the Wayne E. Nesbitt and Ethel

08246

Cook 33-20

0.99981000

63W

NWSE

2/24/2008

COL00151.002

M. Nesbitt Revocable Trust dated May 14,1997

Petroleum Development Corporation

3/9/2005

3301778

Brooke L. Hale & Dusty W. Hale, wife

08247

Cook 34-20

0.99981000

63W

SWSE

2/29/2008

COL00151.003

and husband

Petroleum Development Corporation

2/27/2008

08248

Cook 20 D

0.99981000

63W

SWSE

3/6/2008

COL00819.000

Julia M. Cook

Petroleum Development Corporation

1/17/2005

3271245

Donald L. Carmichael and Michele M.

07216

Carmichael 43-26

0.99981000

63W

NESE

9/22/2007

COL00053.001

Carmichael, joint tenants

Petroleum Development Corporation

7/30/2006

3436007

Tommy W. Kime and Bobetta A. Kime,

07214

Carmichael 33-26

0.99981000

63W

NWSE

9/26/2007

COL00053.002

husband and wife

Petroleum Development Corporation

8/13/2006

3459452

Michael Guttersen and Henrietta Quinn

COL00053.003

Guttersen

Petroleum Development Corporation

10/20/2006

3451369

COL00053.004

Betty L. Campbell, individually

Petroleum Development Corporation

10/20/2006

3459445

07280

Wahlert 41-34

0.99981000

63W

NENE

9/4/2007

COL00057.001

Wahlert Land & Livestock, LLC

Petroleum Development Corporation

10/20/2006

3451371

Michael Guttersen and Henrietta Quinn

07281

Wahlert 42-34

0.99981000

63W

SENE

9/8/2007

COL00057.002

Guttersen

Petroleum Development Corporation

10/20/2006

07204

Rusco 33-23

0.99981000

66W

NWSE

8/21/2007

COL00024.000

Theodore G. Magnuson

Petroleum Development Corporation

1/15/2007

3460316

Page 4 of 6

Exhibit "A"

Weld County, Colorado

Attached to and made part of that Assignment of Working Interest dated August 21, 2007 by and between Petroleum Development Corporation and Rockies Region 2007 Limited Partnership

WELL #

WELL NAME

WORKING INT.

TWP

RNG

SEC

Q/Q

Spud Date

PDC Lease Number

Lessor

Lessee

Lease Date

Book

Rec

COL00739.000

Rusco Land & Cattle, LLC

Petroleum Development Corporation

1/29/2006

3371856

07206

Rusco 44-23

0.99981000

66W

SESE

8/26/2007

COL00024.000

Theodore G. Magnuson

Petroleum Development Corporation

1/15/2007

3460316

07205

Rusco 43-23

0.99981000

66W

NESE

8/31/2007

COL00739.000

Rusco Land & Cattle, LLC

Petroleum Development Corporation

1/29/2006

3371856

71008

Tracy 31-23

0.99981000

66W

NWNE

10/23/2007

TBD

Steven A. Tracy and Cheryl A. Tracy

Petroleum Development Corporation

1/29/2006

3371857

71009

Tracy 32-23

0.99981000

66W

SWNE

10/28/2007

COL00739.000

Rusco Land & Cattle, LLC

Petroleum Development Corporation

1/29/2006

3371856

08071

Rotharmel 33A

0.739332801

66W

SWNW

2/24/2008

COL00745.000

Donald L Rotharmel and Joan E. Rotharmel, Husband and Wife

D. L. Percell

6/6/1980

909

1830787

Charles F. Brett, Jr. and Jeanette

COL00389.000

Corrigan-Brett, husband and wife

Petroleum Development Corporation

12/6/2007

3534047

Charles F. Brett, Jr. and Jeanette

71010

Rotharmel 11-33

0.745781

66W

NWNW

12/30/2007

COL00389.000

Corrigan-Brett, husband and wife

Petroleum Development Corporation

12/6/2007

3534047

08033

Rotharmel 12-33

0.745781

65W

SWNW

1/4/2008

COL00745.000

Donald L. Rotharmel and Joan E. Rotharmel, Husband and Wife

D. L. Percell

6/6/1980

909

1830787

08034

Rotharmel 22-33

0.7328326

65W

SENW

1/10/2008

COL00745.000

Donald L. Rotharmel and Joan E. Rotharmel, Husband and Wife

D. L. Percell

6/6/1980

909

1830787

Sandra Brown Lustig, individually aka

Page 5 of 6

Exhibit "A"

Weld County, Colorado

Attached to and made part of that Assignment of Working Interest dated August 21, 2007 by and between Petroleum Development Corporation and Rockies Region 2007 Limited Partnership

WELL #

WELL NAME

WORKING INT.

TWP

RNG

SEC

Q/Q

Spud Date

PDC Lease Number

Lessor

Lessee

Lease Date

Book

Rec

08070

Telarico 33C

0 99981000

66W

NWNE

1/20/2007

COL00076.001

E. Sandra Lustig

Petroleum Development Corporation

12/13/2005

3362285

08068

Telarico 31-33

0.99981000

66W

NWNE

1/15/2008

COL00076.002

Robyn Tsesarsky, individually

Petroleum Development Corporation

12/13/2005

3371854

08069

Hollister 32-33

0.99981000

66W

SWNE

1/25/2008

COL00076.003

Shauna Jacobson, individually

Petroleum Development Corporation

12/13/2005

3379952

J. Gale Moody, with executor rights and

08095

Hall 42-33

0.99981000

66W

SENE

1/30/2008

COL00076.004

individually

Petroleum Development Corporation

12/13/2005

3379959

08072

Tolmachoff 41-33

0.99981000

66W

NENE

2/19/2008

COL00076.005

Alex Brown, individually

Petroleum Development Corporation

12/13/2005

3377833

COL00076.006

David L. Brown, individually

Petroleum Development Corporation

12/13/2005

3377832

Zolman E. Brown Trust, Created under the

Zolman E. Brown Revocable Trust dated

COL00076.007

December 19, 1970

Petroleum Development Corporation

1/25/2007

3462989

08076

Anderson 43-34

0.99681057

66W

NESE

3/12/2008

COL00028.000

Don Anderson Inc., a Colorado Corp.

Petroleum Development Corporation

11/27/2005

3354265

08432

Anderson 34B

0.99981000

66W

SESW

3/19/2008

COL00026.001

Colleen G. Rossman

Petroleum Development Corporation

12/17/2005

3362282

Richard E. Mulhern, Jr., and Elizabeth

COL00026.002

Mulhern, husband and wife

Petroleum Development Corporation

12/17/2005

3371850

COL00028.000

Don Anderson Inc., a Colorado Corp.

Petroleum Development Corporation

11/27/2005

3354265

08075

Anderson 34-34

0.99981000

66W

SWSE

3/30/2008

COL00028.000

Don Anderson Inc., a Colorado Corp.

Petroleum Development Corporation

11/27/2005

3354265

08074

Anderson 33-34

0.99981000

66W

NWSE

3/24/2008

Page 6 of 6