Exhibit 10.2





Puckett #44C-7D


Lease No. 636800





ASSIGNMENT OF WORKING INTEREST





This Assignment made this 11th day of May 2004 from PETROLEUM DEVELOPMENT CORPORATION, a Nevada Corporation, (herein called "Assignor") to PDC 2004-B, 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 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 therefrom.





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.










Puckett #44C-7D


Lease No. 636800





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





PETROLEUM DEVELOPMENT CORPORATIONA Nevada CorporationBy:
/s/ William D. GainorWilliam D. GainorLand Manager








STATE OF WEST VIRGINIA
)


)
TO-WIT


COUNTY OF HARRISON
)





The foregoing instrument was acknowledged before me this 13th day of July, 2004 by William D. Gainor, Land Manager of Petroleum Development Corporation, a Nevada Corporation, for and on behalf of
the Corporation. He executed the foregoing for the purposes therein contained.








OFFICIAL SEAL

/s/ Rita A. ClarkNotary Public, State of West Virginia

Rita A. ClarkRITA A. CLARK

Notary Public -
State of West VirginiaPetroleum Development Corporation


County of Harrison103 East Main Street, Box 26

My Commission expires: June 2, 2009Bridgeport, WV 26330My commission expires June 2, 2009








This instrument was prepared by:




Petroleum Development Corporation


103 East Main Street


P. O. Box 26


Bridgeport, WV 26330


Ph: 1-800-624-3821 or 304-842-6256











Puckett 44C-7D


Lease No. 636800





AMENDMENT TO


ASSIGNMENT OF WORKING INTEREST





THIS AMENDMENT TO ASSIGNMENT OF WORKING INTEREST is made March 6, 2006 between Petroleum Development Corporation, a Nevada corporation, and PDC 2004-B Limited Partnership, a West Virginia limited partnership whose address is P.O. Box 26, Bridgeport, West Virginia 26330.





1.  Background. By this instrument, the parties correct and amend the Assignment of Working Interest (the "Original Assignment"), dated May 11, 2004 and recorded as Instrument No. 667207 in the real property records of Garfield County, Colorado.





2.  Amendment. Petroleum Development Corporation and PDC 2004-B Limited Partnership hereby amend the Original Assignment by deleting in its entirety the Exhibit A that is attached to the Original Assignment and replacing it with the Exhibit A that is attached to this instrument, All other provisions of the Original Assignment are unchanged.





3.  Effective Date. The parties intend that this amendment be deemed effective at the effective date of the Original Assignment, just as if the Exhibit A that is attached to this instrument had originally been attached to the Original Assignment.





IN WITNESS WHEREOF, this instrument has been executed by the parties.





PDC 2004-B LIMITED PARTNERSHIPBy:
Petroleum Development CorporationBy:
/s/ Ersel E. Morgan, JrErsel E. Morgan, Jr. asVice President








STATE OF WEST VIRGINIA
§


§
SS.


COUNTY OF HARRISON
§





The foregoing instrument was acknowledged before me this 5th day of April, 2006, by Ersel E. Morgan, as Vice President of Petroleum Development Corporation, the Managing General Partner of PDC 2004-B
Limited Partnership, a West Virginia limited partnership.





Witness my hand and official seal.





OFFICIAL SEAL

/s/ Rita A. ClarkNotary Public, State of West Virginia

Rita A. Clark as Notary PublicRITA A. CLARK

Harrison County, West VirginiaPetroleum Development Corporation

My Commission expires: June 2, 2009103 East Main Street, Box 26Bridgeport, WV 26330My commission expires June 2, 2009











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Puckett 44C-7D
Puckett Land Company
11-15-1999
556562
T7S,R96W Sec. 7:SESE
Garfield
Colorado
0.99855
636800











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OP WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Puckett 41C-18D
Puckett Land Company
11-15-1999
556562
T7S, R96W Sec. 18: NE4NE4
Garfield
Colorado
0.99855
636800











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Puckett 12C-17D
Puckett Land Company
11-15-1999
556562
T7S, R96W Sec. 17: SW4NW4
Garfield
Colorado
0.99855
636800











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Puckett 42C-18D
Puckett Land Company
11-15-1999
556562
T7S, R96W Sec. 18: SE4NE4
Garfield
Colorado
0.99855
636800











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Chevron Texaco 41C -13D
Chevron USA, Inc.
11-15-2002
623088
T6S, R97W Sec. 13: NE4NE4
Garfield
Colorado
0.99855
691500











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Puckett 44C-25
Puckett Land Company
11-15-1999
556562
T6S, R97W Sec 25: SESE
Garfield
Colorado
0.99855
636800











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Puckett 43C-25
Puckett Land Company
11-15-1999
556562
T6S, R97W Sec. 25:NESE
Garfield
Colorado
0.25
636800











Schrant #23-12


Lease No. 757000





ASSIGNMENT OF WORKING INTEREST





This Assignment made this 27TH day of July 2004 from PETROLEUM DEVELOPMENT CORPORATION, a Nevada Corporation, (herein called "Assignor") to PDC 2004B, 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 (he 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 ail 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 (hat 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 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 therefrom.





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.











Schrant #23-12


Lease No. 757000





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





PETROLEUM DEVELOPMENT CORPORATIONA Nevada CorporationBy
William D. GainorLand Manager





STATE OF WEST VIRGINIA
)


)
TO-WIT:


COUNTY OF HARRISON
)





The foregoing instrument was acknowledged before me this 4th day of August, 2004 by William D. Gainor, Land Manager of Petroleum Development Corporation,a Nevada Corporation, for and on behalf of the Corporation.
He executed the foregoing for the purposes therein contained.








OFFICIAL SEAL

/s/ Rita A. ClarkNotary Public, State of West Virginia

Rita A. ClarkRITA A. CLARK

Notary Public -
State of West VirginiaPetroleum Development Corporation


County of Harrison103 East Main Street, Box 26

My Commission expires: June 2, 2009Bridgeport, WV 26330My commission expires June 2, 2009





This instrument was prepared by:




Petroleum Development Corporation


103 East Main Street


P.O. Box 26 Bridgeport, WV 26330


Ph: 1-800-624-3821 or 304-842-6256











Schrant 23-12


Lease No. 757000





AMENDMENT TO


ASSIGNMENT OF WORKING INTEREST





THIS AMENDMENT TO ASSIGNMENT OF WORKING INTEREST is made March 6, 2006 between Petroleum Development Corporation, a Nevada corporation, and PDC 2004-B Limited Partnership, a West Virginia limited partnership whose address is P.O. Box 26, Bridgeport, West Virginia 26330.





1. Background. By this instrument, the parties correct and amend the Assignment of Working Interest (the "Original Assignment"), dated July 27, 2004 and recorded as Instrument" No. 3253743 in the real property records of Weld County, Colorado.





2. Amendment. Petroleum Development Corporation and PDC 2004-B Limited Partnership hereby amend the Original Assignment by deleting in its entirety the Exhibit A that is attached to the Original Assignment and replacing it with the Exhibit A that is attached to this instrument. All other provisions of the Original Assignment are unchanged.





3. Effective Date. The parties intend that this amendment be deemed effective at the effective date of the Original Assignment, just as if the Exhibit A that is attached to this instrument had originally been attached to the Original Assignment.





IN WITNESS WHEREOF, this instrument has been executed by the parties.





PDC 2004-B LIMITED PARTNERSHIPBy:
Petroleum Development CorporationBy:
/s/ Ersel E. Morgan, JrErsel E. Morgan, Jr as Vice President





STATE OF WEST VIRGINIA
§


§
SS.


COUNTY OF HARRISON
§





The foregoing instrument was acknowledged before me this 5th day of April, 2006, by Ersel E. Morgan, as Vice President of Petroleum Development Corporation, the Managing General Partner of PDC 2004-B Limited Partnership, a West Virginia limited partnership.





Witness my hand and official seal.








OFFICIAL SEAL

/s/ Rita A. ClarkNotary Public, State of West Virginia

Rita A. Clark as Notary Public -RITA A. CLARK

Harrison County, West VirginiaPetroleum Development Corporation

My Commission expires: June 2, 2009103 East Main Street, Box 26Bridgeport, WV 26330My commission expires June 2, 2009










EXHIBIT "A"
 AMENDMENT TO ASSIGNMENT OF WORKING INTEREST
 PDC 2004-B LIMITED PARTNERSHIP


WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Schrant 23-12
Kenneth Schrant and Debra Schrant
04-16-2004
3182092
T6N, R64W Sec. 12: NESW
Weld
Colorado
0.99855
757000Andrew E. Root and Ella Mae Root
04-16-2004
3184273








EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Schrant 24-12
Kenneth Schrant and Debra Schrant
04-16-2004
3182092
T6N, R64W Sec. 12: SESW
Weld
Colorado
0.99855
757000Andrew E. Root and Ella Mae Root
04-16-2004
3184273











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Wells Ranch 14-27
Anadarko E & P Co., LP and Anadarko Land Corp.
08-18-2004
3258642
T6N, R63W Sec. 27: SW4SW4
Weld
Colorado
0.87373125
760600











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Ruff 21-3
Anadarko E & P Co., LP and Anadarko Land Corp.
08-26-2004
3243366
T6N, R64W Sec. 3: NE4NW4
Weld
Colorado
0.87373125
762200











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Green 13-24
Gerald G. Green
04-20-2004
3189020
T7N, R65W Sec. 24: NW4SW4
Weld
Colorado
0.99855
758400Shirley J. Green Living Trust
04-20-2004
3195095




758400George L. Green Living Trust
04-20-2004
3201753




758400William C. Heinze
04-20-2004
3189019




758400Ronald O. Kindvall
08-19-2004
3237669




777600Duane Aranci
09-13-2004
3237666




777300James Aranci
09-13-2004
3237667




777400Jean Aranci
09-13-2004
3237668




777500











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Christiansen 31-33
Anadarko E & P Co., LP and Anadarko Land Corp.
09-02-2004
3243325
T7N, R64W Sec. 33: NW4NE4
Weld
Colorado
0.87373125
763000











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Green 22-24
Gerald G. Green
04-20-2004
3189020
T7N, R65W Sec. 24: SE4NW4
Weld
Colorado
0.99855
758400











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Booth 31-25
Anadarko E&P Co., LP and Anadarko Land Corp.
09-08-2004
3243362
T7N, R65W Sec. 25: NWNW
Weld
Colorado
0.87373125
764000











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Richter 13-27
Anadarko E & P Co., LP and Anadarko Land Corp.
09-14-2004
3243365
T7N, R64W Sec. 27: NW4SW4
Weld
Colorado
0.87373125
764200











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Green Trust 24-24
Gerald R. Green
04-20-2004
3189020
T7N, R65W Sec. 24: SESW
Weld
Colorado
0.99855
761400Shirley J. Green Living Trust
04-20-2004
3195095George L. Green Living Trust
04-20-2004
3201753William Curtis Heinze
04-20-2004
3189019











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Cockroft 43-11
Anadarko E&P Co., LP and Anadarko Land Corp.
02-04-2004
3243363
T6N, R64W Sec. 11: NE4SE4
Weld
Colorado
0.79884
730200











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Cockroft 34-11
Anadarko E & P Co., LP and Anadarko Land Corp.
02-04-2004
3243363
T6N, R64W Sec. 11: SW4SE4
Weld
Colorado
0.79884
730200











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Northern Prop 14-29
Anadarko E & P Co., LP and Anadarko Land Corp.
09-28-2004
3258643
T7N, R65W Sec. 29: SW4SW4
Weld
Colorado
0.87373125
764100











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Lawley 43-4
Sherry Lawley
07-06-2004
3208264
T6N, R64W Sec. 4: NE4SE4
Weld
Colorado
0.99855
763600











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Lawley 33-4
Sherry Lawley
07-06-2004
3208264
T6N, R64W Sec. 4: NW4SE4
Weld
Colorado
0.99855
763600











EXHIBIT "A"


AMENDMENT TO ASSIGNMENT OF WORKING INTEREST


PDC 2004-B LIMITED PARTNERSHIP





WELL NAME
LESSOR OR ASSIGNOR
LEASE DATE
RECEPTION NO. BOOK/PAGE
LEGAL DESCRIPTION
COUNTY
STATE
ASSIGNED INTEREST
LEASE NO.Bixler 31-5
Anadarko E&P Co., LP and Anadarko Land Corp.
10-19-2004
3243323
T6N, R63W Sec. 5: NW4NE4
Weld
Colorado
0.87373125
765400