----

----

| West Virginia                                                  | 20-0547582                           |
|----------------------------------------------------------------|--------------------------------------|
| (State or other jurisdiction of incorporation or organization) | (I.R.S. Employer Identification No.) |

| Large accelerated filer      ̈ | Accelerated filer      ̈    |
|-------------------------------------------------------------|----------------------------------------------------------|
|                                                        |                                                     |
| Non-accelerated filer      ̈   | Smaller reporting company     x |

----

----

----

PDC 2004-D LIMITED PARTNERSHIP

|     |                                                                                        | Page   |
|----------|---------------------------------------------------------------------------------------------|--------|
|     | PART I – FINANCIAL INFORMATION                                                        |   |
|     |                                                                                        |   |
| Item 1.  | Financial Statements (unaudited)                                                            |   |
|     | Condensed Balance Sheets (unaudited)                                                        | 2      |
|     | Condensed Statements of Operations (unaudited)                                              | 3      |
|     | Condensed Statements of Cash Flows (unaudited)                                              | 4      |
|     | Notes to Unaudited Condensed Financial Statements                                           | 5      |
| Item 2.  | Management’s Discussion and Analysis of Financial Condition and Results of Operations | 13     |
| Item 3.  | Quantitative and Qualitative Disclosures About Market Risk                                  | 24     |
| Item 4T. | Controls and Procedures                                                                     | 24     |
|     |                                                                                        |   |
|     | PART II – OTHER INFORMATION                                                           |   |
|     |                                                                                        |   |
| Item 1.  | Legal Proceedings                                                                           | 25     |
| Item 1A. | Risk Factors                                                                                | 25     |
| Item 2.  | Unregistered Sales of Equity Securities and Use of Proceeds                                 | 25     |
| Item 3.  | Defaults Upon Senior Securities                                                             | 25     |
| Item 4.  | [Removed and Reserved]                                                                      | 25     |
| Item 5.  | Other Information                                                                           | 25     |
| Item 6.  | Exhibits                                                                                    | 26     |
|     |                                                                                        |   |
|     | SIGNATURES                                                                                  | 27     |

----

Index

|   | · | changes in production volumes, worldwide demand, and commodity prices for natural gas and oil; |
|--------|--------|------------------------------------------------------------------------------------------------|

|   | · | changes in estimates of proved reserves; |
|--------|--------|------------------------------------------|

|   | · | the timing and extent of the Partnership’s success in further developing and producing the Partnership’s natural gas and oil reserves; |
|--------|--------|----------------------------------------------------------------------------------------------------------------------------------------------------|

|   | · | the Managing General Partner’s ability to acquire drilling rigs, supplies and services at reasonable prices; |
|--------|--------|--------------------------------------------------------------------------------------------------------------------|

|   | · | risks incident to the recompletion and operation of natural gas and oil wells; |
|--------|--------|--------------------------------------------------------------------------------|

|   | · | future production and well recompletion costs; |
|--------|--------|------------------------------------------------|

|   | · | the availability of Partnership future cash flows for investor distributions or funding of Well Recompletion Plan activities; |
|--------|--------|-------------------------------------------------------------------------------------------------------------------------------|

|   | · | the timing and closing, if consummated, of the proposed merger of the Partnership with and into PDC’s wholly-owned subsidiary, DP 2004 Merger Sub, LLC; |
|--------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | · | the availability of funding for the consideration payable by PDC and its wholly-owned subsidiary, DP 2004 Merger Sub, LLC to consummate the merger; |
|--------|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------|

|   | · | the availability of sufficient pipeline and other transportation facilities to carry Partnership production and the impact of these facilities on price; |
|--------|--------|----------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | · | the effect of existing and future laws, governmental regulations and the political and economic climate of the United States of America, or U.S.; |
|--------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------|

|   | · | changes in environmental laws and the regulations and enforcement related to those laws; |
|--------|--------|------------------------------------------------------------------------------------------|

|   | · | the identification of and severity of environmental events and governmental responses to the events; |
|--------|--------|------------------------------------------------------------------------------------------------------|

|   | · | the effect of natural gas and oil derivatives activities; |
|--------|--------|-----------------------------------------------------------|

|   | · | conditions in the capital markets; and |
|--------|--------|----------------------------------------|

|   | · | losses possible from pending or future litigation. |
|--------|--------|----------------------------------------------------|

----

Index

| Item 1. | Financial Statements (unaudited) |
|---------|----------------------------------|

PDC 2004-D Limited Partnership

|                                                                  |   | June 30, |        |   | December 31, |   |
|-----------------------------------------------------------------------|--------|---------------|-------------|--------|-------------------|--------|
|                                                                  |   | 2010          |        |   |              | 2009*  |   |
| Assets                                                                |   |          |        |   |              |   |   |
|                                                                  |   |          |        |   |              |   |   |
| Current assets:                                                       |   |          |        |   |              |   |   |
| Cash and cash equivalents                                             |   | $             | 238,058     |   |              | $      | 238,058 |   |
| Accounts receivable                                                   |   |          | 253,321     |   |              |   | 282,670 |   |
| Oil inventory                                                         |   |          | 19,032      |   |              |   | 17,913 |   |
| Due from Managing General Partner-derivatives                         |   |          | 532,424     |   |              |   | 476,907 |   |
| Due from Managing General Partner-other, net                          |   |          | 38,680      |   |              |   | 285,922 |   |
| Total current assets                                                  |   |          | 1,081,515   |   |              |   | 1,301,470 |   |
|                                                                  |   |          |        |   |              |   |   |   |
|                                                                  |   |          |        |   |              |   |   |   |
| Oil and gas properties, successful efforts method, at cost            |   |          | 39,017,216  |   |              |   | 39,006,869 |   |
| Less:  Accumulated depreciation, depletion and amortization |   |          | (19,158,990 | )      |              |   | (17,783,836 | ) |
| Oil and gas properties, net                                           |   |          | 19,858,226  |   |              |   | 21,223,033 |   |
|                                                                  |   |          |        |   |              |   |   |   |
| Due from Managing General Partner-derivatives                         |   |          | 1,085,960   |   |              |   | 459,933 |   |
| Other assets                                                          |   |          | 38,170      |   |              |   | 25,623 |   |
| Total noncurrent assets                                               |   |          | 20,982,356  |   |              |   | 21,708,589 |   |
|                                                                  |   |          |        |   |              |   |   |   |
| Total Assets                                                          |   | $             | 22,063,871  |   |              | $      | 23,010,059 |   |
|                                                                  |   |          |        |   |              |   |   |   |
| Liabilities and Partners' Equity                                      |   |          |        |   |              |   |   |   |
|                                                                  |   |          |        |   |              |   |   |   |
| Current liabilities:                                                  |   |          |        |   |              |   |   |   |
| Accounts payable and accrued expenses                                 |   | $             | 27,988      |   |              | $      | 32,277 |   |
| Due to Managing General Partner-derivatives                           |   |          | 430,398     |   |              |   | 457,791 |   |
| Total current liabilities                                             |   |          | 458,386     |   |              |   | 490,068 |   |
|                                                                  |   |          |        |   |              |   |   |   |
| Due to Managing General Partner-derivatives                           |   |          | 1,132,426   |   |              |   | 1,311,858 |   |
| Asset retirement obligations                                          |   |          | 464,861     |   |              |   | 451,315 |   |
| Total liabilities                                                     |   |          | 2,055,673   |   |              |   | 2,253,241 |   |
|                                                                  |   |          |        |   |              |   |   |   |
| Commitments and contingent liabilities                                |   |          |        |   |              |   |   |   |
|                                                                  |   |          |        |   |              |   |   |   |
| Partners' equity:                                                     |   |          |        |   |              |   |   |   |
| Managing General Partner                                              |   |          | 4,011,425   |   |              |   | 4,161,150 |   |
| Limited Partners - 1,749.95 units issued and outstanding              |   |          | 15,996,773  |   |              |   | 16,595,668 |   |
| Total Partners' equity                                                |   |          | 20,008,198  |   |              |   | 20,756,818 |   |
|                                                                  |   |          |        |   |              |   |   |   |
| Total Liabilities and Partners' Equity                                |   | $             | 22,063,871  |   |              | $      | 23,010,059 |   |

----

Index

PDC 2004-D Limited Partnership

|                                                                    |   | Three months ended June 30, |     |   | Six months ended June 30, |   |
|-------------------------------------------------------------------------|--------|----------------------------------|----------|--------|--------------------------------|--------|
|                                                                    |   | 2010                             |     |   | 2009                           |   |   | 2010 |   |   | 2009 |   |
| Revenues:                                                               |   |                             |     |   |                           |   |   |   |   |   |   |   |
| Natural gas and oil sales                                               |   | $                                | 679,709  |   |                           | $      | 515,724 |   |   | $ | 1,640,374 |   |   | $ | 1,112,667 |   |
| Commodity price risk management gain (loss), net                        |   |                             | 297,818  |   |                           |   | (662,608 | ) |   |   | 1,326,512 |   |   |   | (703,514 | ) |
| Total revenues                                                          |   |                             | 977,527  |   |                           |   | (146,884 | ) |   |   | 2,966,886 |   |   |   | 409,153 |   |
|                                                                    |   |                             |     |   |                           |   |   |   |   |   |   |   |   |   |   |   |
| Operating costs and expenses:                                           |   |                             |     |   |                           |   |   |   |   |   |   |   |   |   |   |   |
| Natural gas and oil production costs                                    |   |                             | 223,013  |   |                           |   | 234,052 |   |   |   | 429,149 |   |   |   | 514,445 |   |
| Direct costs - general and administrative                               |   |                             | 43,956   |   |                           |   | 135,378 |   |   |   | 78,535 |   |   |   | 332,162 |   |
| Depreciation, depletion and amortization                                |   |                             | 697,206  |   |                           |   | 722,419 |   |   |   | 1,375,154 |   |   |   | 1,492,521 |   |
| Accretion of asset retirement obligations                               |   |                             | 6,824    |   |                           |   | 4,503 |   |   |   | 13,546 |   |   |   | 9,006 |   |
| Total operating costs and expenses                                      |   |                             | 970,999  |   |                           |   | 1,096,352 |   |   |   | 1,896,384 |   |   |   | 2,348,134 |   |
|                                                                    |   |                             |     |   |                           |   |   |   |   |   |   |   |   |   |   |   |
| Income (loss) from operations                                           |   |                             | 6,528    |   |                           |   | (1,243,236 | ) |   |   | 1,070,502 |   |   |   | (1,938,981 | ) |
|                                                                    |   |                             |     |   |                           |   |   |   |   |   |   |   |   |   |   |   |
| Interest income                                                         |   |                             | -        |   |                           |   | 11,557 |   |   |   | - |   |   |   | 23,923 |   |
|                                                                    |   |                             |     |   |                           |   |   |   |   |   |   |   |   |   |   |   |
| Net income (loss)                                                       |   | $                                | 6,528    |   |                           | $      | (1,231,679 | ) |   | $ | 1,070,502 |   |   | $ | (1,915,058 | ) |
|                                                                    |   |                             |     |   |                           |   |   |   |   |   |   |   |   |   |   |   |
| Net income (loss) allocated to partners                                 |   | $                                | 6,528    |   |                           | $      | (1,231,679 | ) |   | $ | 1,070,502 |   |   | $ | (1,915,058 | ) |
| Less:  Managing General Partner interest in net income (loss) |   |                             | 1,305    |   |                           |   | (246,336 | ) |   |   | 214,100 |   |   |   | (383,012 | ) |
| Net income (loss) allocated to Investor Partners                        |   | $                                | 5,223    |   |                           | $      | (985,343 | ) |   | $ | 856,402 |   |   | $ | (1,532,046 | ) |
|                                                                    |   |                             |     |   |                           |   |   |   |   |   |   |   |   |   |   |   |
| Net income (loss) per Investor Partner unit                             |   | $                                | 3        |   |                           | $      | (563 | ) |   | $ | 489 |   |   | $ | (875 | ) |
|                                                                    |   |                             |     |   |                           |   |   |   |   |   |   |   |   |   |   |   |
| Investor Partner units outstanding                                      |   |                             | 1,749.95 |   |                           |   | 1,749.95 |   |   |   | 1,749.95 |   |   |   | 1,749.95 |   |

----

Index

PDC 2004-D Limited Partnership

|                                                                                     |   | Six months ended June 30, |       |
|------------------------------------------------------------------------------------------|--------|--------------------------------|------------|
|                                                                                     |   | 2010                           |       |   | 2009 |   |
| Cash flows from operating activities:                                                    |   |                           |       |   |   |   |
| Net income (loss)                                                                        |   | $                              | 1,070,502  |   |   | $ | (1,915,058 | ) |
| Adjustments to reconcile net income (loss) to net cash provided by operating activities: |   |                           |       |   |   |   |   |   |
| Depreciation, depletion and amortization                                                 |   |                           | 1,375,154  |   |   |   | 1,492,521 |   |
| Accretion of asset retirement obligations                                                |   |                           | 13,546     |   |   |   | 9,006 |   |
| Unrealized (gain) loss on derivative transactions                                        |   |                           | (888,369   | ) |   |   | 1,963,556 |   |
| Changes in operating assets and liabilities:                                             |   |                           |       |   |   |   |   |   |
| Decrease in accounts receivable                                                          |   |                           | 29,349     |   |   |   | 65,682 |   |
| (Increase) decrease in oil inventory                                                     |   |                           | (1,119     | ) |   |   | 6,445 |   |
| Increase in other assets                                                                 |   |                           | (12,547    | ) |   |   | (13,015 | ) |
| Decrease in accounts payable and accrued expenses                                        |   |                           | (4,289     | ) |   |   | (27,610 | ) |
| Decrease in due from Managing General Partner - other, net                               |   |                           | 247,242    |   |   |   | 383,915 |   |
| Net cash provided by operating activities                                                |   |                           | 1,829,469  |   |   |   | 1,965,442 |   |
|                                                                                     |   |                           |       |   |   |   |   |   |
| Cash flows from investing activities:                                                    |   |                           |       |   |   |   |   |   |
| Capital expenditures for oil and gas properties                                          |   |                           | (10,347    | ) |   |   | (240 | ) |
| Net cash used in investing activities                                                    |   |                           | (10,347    | ) |   |   | (240 | ) |
|                                                                                     |   |                           |       |   |   |   |   |   |
| Cash flows from financing activities:                                                    |   |                           |       |   |   |   |   |   |
| Distributions to Partners                                                                |   |                           | (1,819,122 | ) |   |   | (1,963,679 | ) |
| Net cash used in financing activities                                                    |   |                           | (1,819,122 | ) |   |   | (1,963,679 | ) |
|                                                                                     |   |                           |       |   |   |   |   |   |
| Net increase in cash and cash equivalents                                                |   |                           | -          |   |   |   | 1,523 |   |
| Cash and cash equivalents, beginning of period                                           |   |                           | 238,058    |   |   |   | 236,493 |   |
| Cash and cash equivalents, end of period                                                 |   | $                              | 238,058    |   |   | $ | 238,016 |   |

----

Index

PDC 2004-D LIMITED PARTNERSHIP

----

Index

|                                                                                      |   | June 30, |     |   | December 31, |   |
|-------------------------------------------------------------------------------------------|--------|---------------|----------|--------|-------------------|--------|
|                                                                                      |   | 2010          |     |   | 2009              |   |
|                                                                                      |   |          |     |   |              |   |
| Natural gas and oil sales revenues collected from the Partnership's third-party customers |   | $             | 221,403  |   |              | $      | 269,194 |   |
| Commodity Price Risk Management, Realized Gains                                           |   |          | 29,033   |   |              |   | 342,602 |   |
| Other (1)                                                                                 |   |          | (211,756 | )      |              |   | (325,874 | ) |
| Total Due from Managing General Partner-other, net                                        |   | $             | 38,680   |   |              | $      | 285,922 |   |

|   | (1) | All other unsettled transactions, excluding derivative instruments, between the Partnership and the Managing General Partner.  The majority of these are operating costs or general and administrative costs which have not been deducted from distributions. |
|--------|-----|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

----

Index

|                                       |   | Three months ended June 30, |    |   | Six months ended June 30, |   |
|--------------------------------------------|--------|----------------------------------|---------|--------|--------------------------------|--------|
|                                       |   | 2010                             |    |   | 2009                           |   |   | 2010 |   |   | 2009 |   |
|                                       |   |                             |    |   |                           |   |   |   |   |   |   |   |
| Well operations and maintenance            |   | $                                | 141,716 |   |                           | $      | 166,376 |   |   | $ | 281,428 |   |   | $ | 369,186 |   |
| Gathering, compression and processing fees |   |                             | 42,122  |   |                           |   | 38,860 |   |   |   | 86,467 |   |   |   | 81,020 |   |
| Direct costs - general and administrative  |   |                             | 43,956  |   |                           |   | 135,378 |   |   |   | 78,535 |   |   |   | 332,162 |   |
| Cash distributions*                        |   |                             | 197,177 |   |                           |   | 296,857 |   |   |   | 438,132 |   |   |   | 469,236 |   |

|   | · | should all parties agree by mutual consent to terminate the agreement; |
|--------|--------|------------------------------------------------------------------------|

|   | · | by any party thereto, should the proposed merger not occur by December 31, 2010; |
|--------|--------|----------------------------------------------------------------------------------|

|   | · | by any party thereto, should consummation of the merger become illegal or be otherwise prohibited by law or regulation; |
|--------|--------|-------------------------------------------------------------------------------------------------------------------------|

|   | · | by any party thereto, should any suit or action be pending against parties to the agreement challenging the legality or any aspect of the merger transaction; |
|--------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------|

----

Index

|   | · | by the Special Committee, on behalf of the Partnership and prior to approval by third-party Investor Partners, should the Special Committee believe it has received a superior offer that is more favorable to the third-party Investor Partners; or |
|--------|--------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | · | by PDC or the Partnership, should either PDC or the Partnership fail to perform its obligations under the Merger Agreement and such failure has a non-curable material adverse effect on the PDC or the Partnership, respectively, or materially and adversely affects the transactions contemplated by the Merger Agreement. |
|--------|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

----

Index

|                                  |   | Quoted Prices inActive Markets(Level 1) |      |   | SignificantUnobservable Inputs(Level 3) |   |       | Total  |   |
|---------------------------------------|--------|-----------------------------------------|-----------|--------|-----------------------------------------|--------|------------|--------|--------|
|                                  |   |                                    |      |   |                                    |   |       |   |   |
| As of December 31, 2009               |   |                                    |      |   |                                    |   |       |   |   |
| Assets:                               |   |                                    |      |   |                                    |   |       |   |   |
| Commodity based derivatives           |   | $                                       | 465,312   |   |                                    | $      | 471,528    |   |   | $ | 936,840 |   |
| Total assets                          |   |                                    | 465,312   |   |                                    |   | 471,528    |   |   |   | 936,840 |   |
|                                  |   |                                    |      |   |                                    |   |       |   |   |   |   |   |
| Liabilities:                          |   |                                    |      |   |                                    |   |       |   |   |   |   |   |
| Commodity based derivatives           |   |                                    | (31,472   | )      |                                    |   | (72,095    | )      |   |   | (103,567 | ) |
| Basis protection derivative contracts |   |                                    | -         |   |                                    |   | (1,666,082 | )      |   |   | (1,666,082 | ) |
| Total liabilities                     |   |                                    | (31,472   | )      |                                    |   | (1,738,177 | )      |   |   | (1,769,649 | ) |
|                                  |   |                                    |      |   |                                    |   |       |   |   |   |   |   |
| Net asset (liability)                 |   | $                                       | 433,840   |   |                                    | $      | (1,266,649 | )      |   | $ | (832,809 | ) |
|                                  |   |                                    |      |   |                                    |   |       |   |   |   |   |   |
| As of June 30, 2010                   |   |                                    |      |   |                                    |   |       |   |   |   |   |   |
| Assets:                               |   |                                    |      |   |                                    |   |       |   |   |   |   |   |
| Commodity based derivatives           |   | $                                       | 1,447,379 |   |                                    | $      | 171,005    |   |   | $ | 1,618,384 |   |
| Total assets                          |   |                                    | 1,447,379 |   |                                    |   | 171,005    |   |   |   | 1,618,384 |   |
|                                  |   |                                    |      |   |                                    |   |       |   |   |   |   |   |
| Liabilities:                          |   |                                    |      |   |                                    |   |       |   |   |   |   |   |
| Commodity based derivatives           |   |                                    | -         |   |                                    |   | (39,033    | )      |   |   | (39,033 | ) |
| Basis protection derivative contracts |   |                                    | -         |   |                                    |   | (1,523,791 | )      |   |   | (1,523,791 | ) |
| Total liabilities                     |   |                                    | -         |   |                                    |   | (1,562,824 | )      |   |   | (1,562,824 | ) |
|                                  |   |                                    |      |   |                                    |   |       |   |   |   |   |   |
| Net asset (liability)                 |   | $                                       | 1,447,379 |   |                                    | $      | (1,391,819 | )      |   | $ | 55,560 |   |

|                                                                                                                                               |   | Six months endedJune 30, 2010 |       |
|----------------------------------------------------------------------------------------------------------------------------------------------------|--------|------------------------------------|------------|
| Fair value, net liability, as of December 31, 2009                                                                                                 |   | $                                  | (1,266,649 | ) |
| Changes in fair value included in statement of operations line item:                                                                               |   |                               |       |   |
| Commodity price risk management, net                                                                                                               |   |                               | 162,782    |   |
| Settlements                                                                                                                                        |   |                               | (287,952   | ) |
| Fair value, net liability, as of June 30, 2010                                                                                                     |   | $                                  | (1,391,819 | ) |
|                                                                                                                                               |   |                               |       |   |
| Change in unrealized gains (losses) relating to assets (liabilities) still held as of June 30, 2010 included in statement of operations line item: |   |                               |       |   |
| Commodity price risk management, net                                                                                                               |   | $                                  | 118,799    |   |

----

Index

|                                                           |                       |      |                                          |   | Fair Value    |       |
|----------------------------------------------------------------|----------------------------|-----------|-----------------------------------------------|--------|---------------|------------|
|                                                           |                       |      | Balance Sheet                                 |   | June 30, |       |   | December 31, |   |
| Derivative instruments not designated as hedge  (1): |                       | Line Item |                                          | 2010   |          |       | 2009 |   |
|                                                           |                       |      |                                          |   |          |       |   |   |   |
| Derivative Assets:                                             | Current                    |      |                                          |   |          |       |   |   |   |
|                                                           | Commodity contracts        |      | Due from Managing General Partner-derivatives |   | $             | 532,424    |   |   | $ | 476,907 |   |
|                                                           |                       |      |                                          |   |          |       |   |   |   |   |   |
|                                                           | Non Current                |      |                                          |   |          |       |   |   |   |   |   |
|                                                           | Commodity contracts        |      | Due from Managing General Partner-derivatives |   |          | 1,085,960  |   |   |   | 459,933 |   |
|                                                           |                       |      |                                          |   |          |       |   |   |   |   |   |
| Total Derivative Assets                                        |                       |      |                                          |   | $             | 1,618,384  |   |   | $ | 936,840 |   |
|                                                           |                       |      |                                          |   |          |       |   |   |   |   |   |
| Derivative Liabilities:                                        | Current                    |      |                                          |   |          |       |   |   |   |   |   |
|                                                           | Commodity contracts        |      | Due to Managing General Partner-derivatives   |   | $             | (17,953    | ) |   | $ | (32,349 | ) |
|                                                           |                       |      |                                          |   |          |       |   |   |   |   |   |
|                                                           | Basis protection contracts |      | Due to Managing General Partner-derivatives   |   |          | (412,445   | ) |   |   | (425,442 | ) |
|                                                           | Non Current                |      |                                          |   |          |       |   |   |   |   |   |
|                                                           | Commodity contracts        |      | Due to Managing General Partner-derivatives   |   |          | (21,080    | ) |   |   | (71,218 | ) |
|                                                           |                       |      |                                          |   |          |       |   |   |   |   |   |
|                                                           | Basis protection contracts |      | Due to Managing General Partner-derivatives   |   |          | (1,111,346 | ) |   |   | (1,240,640 | ) |
|                                                           |                       |      |                                          |   |          |       |   |   |   |   |   |
| Total Derivative Liabilities                                   |                       |      |                                          | $      | (1,562,824    | )          |   | $ | (1,769,649 | ) |

----

Index

|                                                   |   | Three months ended June 30,                                                      |     |
|--------------------------------------------------------|--------|----------------------------------------------------------------------------------|----------|
|                                                   |   | 2010                                                                             |     |   | 2009 |   |
| Statement of operations line item                      |   | Reclassification of Realized Gains (Losses) Included in Prior Periods Unrealized |     |   | Realized and Unrealized Gains For the Current Period |   |   | Total |   |   | Reclassification of Realized Gains (Losses) Included in Prior Periods Unrealized |   |   | Realized and Unrealized Losses For the Current Period |   |   | Total |   |
|                                                   |   |                                                                             |     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Commodity price risk management, net                   |   |                                                                             |     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Realized gains (losses)                                |   | $                                                                                | 26,499   |   |   | $ | 8,882 |   |   | $ | 35,381 |   |   | $ | 536,765 |   |   | $ | (37,541 | ) |   | $ | 499,224 |   |
| Unrealized (losses) gains                              |   |                                                                             | (26,499  | ) |   |   | 288,936 |   |   |   | 262,437 |   |   |   | (536,765 | ) |   |   | (625,067 | ) |   |   | (1,161,832 | ) |
| Total commodity price risk management gain (loss), net |   | $                                                                                | -        |   |   | $ | 297,818 |   |   | $ | 297,818 |   |   | $ | - |   |   | $ | (662,608 | ) |   | $ | (662,608 | ) |
|                                                   |   |                                                                             |     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                   |   | Six months ended June 30,                                                        |     |
|                                                   |   | 2010                                                                             |     |   | 2009 |   |
| Statement of operations line item                      |   | Reclassification of Realized Gains (Losses) Included in Prior Periods Unrealized |     |   | Realized and Unrealized Gains For the Current Period |   |   | Total |   |   | Reclassification of Realized Gains (Losses) Included in Prior Periods Unrealized |   |   | Realized and Unrealized Gains (Losses) For the Current Period |   |   | Total |   |
|                                                   |   |                                                                             |     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Commodity price risk management, net                   |   |                                                                             |     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Realized gains                                         |   | $                                                                                | 244,065  |   |   | $ | 194,078 |   |   | $ | 438,143 |   |   | $ | 1,004,354 |   |   | $ | 255,688 |   |   | $ | 1,260,042 |   |
| Unrealized (losses) gains                              |   |                                                                             | (244,065 | ) |   |   | 1,132,434 |   |   |   | 888,369 |   |   |   | (1,004,354 | ) |   |   | (959,202 | ) |   |   | (1,963,556 | ) |
| Total commodity price risk management gain (loss), net |   | $                                                                                | -        |   |   | $ | 1,326,512 |   |   | $ | 1,326,512 |   |   | $ | - |   |   | $ | (703,514 | ) |   | $ | (703,514 | ) |

----

Index

----

Index

| Item 2. | Management’s Discussion and Analysis of Financial Condition and Results of Operations |
|---------|---------------------------------------------------------------------------------------------|

----

Index

|   | · | should all parties agree by mutual consent to terminate the agreement; |
|--------|--------|------------------------------------------------------------------------|

|   | · | by any party thereto, should the proposed merger not occur by December 31, 2010; |
|--------|--------|----------------------------------------------------------------------------------|

|   | · | by any party thereto, should consummation of the merger become illegal or be otherwise prohibited by law or regulation; |
|--------|--------|-------------------------------------------------------------------------------------------------------------------------|

|   | · | by any party thereto, should any suit or action be pending against parties to the agreement challenging the legality or any aspect of the merger transaction; |
|--------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | · | by the Special Committee, on behalf of the Partnership and prior to approval by third-party Investor Partners, should the Special Committee believe it has received a superior offer that is more favorable to the third-party Investor Partners; or |
|--------|--------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | · | by PDC or the Partnership, should either PDC or the Partnership fail to perform its obligations under the Merger Agreement and such failure has a non-curable material adverse effect on the PDC or the Partnership, respectively, or materially and adversely affects the transactions contemplated by the Merger Agreement. |
|--------|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

----

Index

----

Index

|                                                                  |   | Three months ended June 30, |    |   | Six months ended June 30, |   |
|-----------------------------------------------------------------------|--------|----------------------------------|---------|--------|--------------------------------|--------|
|                                                                  |   | 2010                             |    |   | 2009                           |   |   | Change |   |   | 2010 |   |   | 2009 |   |   | Change |   |
| Number of producing wells (end of period)                             |   |                             | 44      |   |                           |   | 44 |   |   |   | - |   |   |   | 44 |   |   |   | 44 |   |   |   | - |   |
|                                                                  |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Production  (1)                                             |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Natural gas (Mcf)                                                     |   |                             | 130,644 |   |                           |   | 132,303 |   |   |   | -1 | % |   |   | 261,801 |   |   |   | 276,816 |   |   |   | -5 | % |
| Oil (Bbl)                                                             |   |                             | 3,930   |   |                           |   | 4,389 |   |   |   | -10 | % |   |   | 7,736 |   |   |   | 8,774 |   |   |   | -12 | % |
| Natural gas equivalents (Mcfe)  (2)                         |   |                             | 154,224 |   |                           |   | 158,637 |   |   |   | -3 | % |   |   | 308,217 |   |   |   | 329,460 |   |   |   | -6 | % |
|                                                                  |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Natural Gas and Oil Sales                                             |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Natural gas                                                           |   | $                                | 400,815 |   |                           | $      | 283,718 |   |   |   | 41 | % |   | $ | 1,068,880 |   |   | $ | 728,295 |   |   |   | 47 | % |
| Oil                                                                   |   |                             | 278,894 |   |                           |   | 232,006 |   |   |   | 20 | % |   |   | 571,494 |   |   |   | 384,372 |   |   |   | 49 | % |
| Total natural gas and oil sales                                       |   | $                                | 679,709 |   |                           | $      | 515,724 |   |   |   | 32 | % |   | $ | 1,640,374 |   |   | $ | 1,112,667 |   |   |   | 47 | % |
|                                                                  |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Realized Gain/(Loss) on Derivatives, net                              |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Natural gas                                                           |   | $                                | (5,215  | )      |                           | $      | 402,696 |   |   |   | -101 | % |   | $ | 359,550 |   |   | $ | 1,017,009 |   |   |   | -65 | % |
| Oil                                                                   |   |                             | 40,596  |   |                           |   | 96,528 |   |   |   | -58 | % |   |   | 78,593 |   |   |   | 243,033 |   |   |   | -68 | % |
| Total realized gain on derivatives, net                               |   | $                                | 35,381  |   |                           | $      | 499,224 |   |   |   | -93 | % |   | $ | 438,143 |   |   | $ | 1,260,042 |   |   |   | -65 | % |
|                                                                  |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Average Selling Price (excluding realized gain/(loss) on derivatives) |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Natural gas (per Mcf)                                                 |   | $                                | 3.07    |   |                           | $      | 2.14 |   |   |   | 43 | % |   | $ | 4.08 |   |   | $ | 2.63 |   |   |   | 55 | % |
| Oil (per Bbl)                                                         |   |                             | 70.97   |   |                           |   | 52.86 |   |   |   | 34 | % |   |   | 73.87 |   |   |   | 43.81 |   |   |   | 69 | % |
| Natural gas equivalents (per Mcfe)                                    |   |                             | 4.41    |   |                           |   | 3.25 |   |   |   | 36 | % |   |   | 5.32 |   |   |   | 3.38 |   |   |   | 57 | % |
|                                                                  |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Average Selling Price (including realized gain/(loss) on derivatives) |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Natural gas (per Mcf)                                                 |   | $                                | 3.03    |   |                           | $      | 5.19 |   |   |   | -42 | % |   | $ | 5.46 |   |   | $ | 6.30 |   |   |   | -13 | % |
| Oil (per Bbl)                                                         |   |                             | 81.30   |   |                           |   | 74.85 |   |   |   | 9 | % |   |   | 84.03 |   |   |   | 71.51 |   |   |   | 18 | % |
| Natural gas equivalents (per Mcfe)                                    |   |                             | 4.64    |   |                           |   | 6.40 |   |   |   | -28 | % |   |   | 6.74 |   |   |   | 7.20 |   |   |   | -6 | % |
|                                                                  |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Average Lifting Cost (per Mcfe)  (3)                        |   | $                                | 1.45    |   |                           | $      | 1.48 |   |   |   | -2 | % |   | $ | 1.39 |   |   | $ | 1.56 |   |   |   | -11 | % |
|                                                                  |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Operating costs and expenses                                          |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Direct costs - general and administrative                             |   | $                                | 43,956  |   |                           | $      | 135,378 |   |   |   | -68 | % |   | $ | 78,535 |   |   | $ | 332,162 |   |   |   | -76 | % |
| Depreciation, depletion and amortization                              |   | $                                | 697,206 |   |                           | $      | 722,419 |   |   |   | -3 | % |   | $ | 1,375,154 |   |   | $ | 1,492,521 |   |   |   | -8 | % |
|                                                                  |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Cash distributions                                                    |   | $                                | 818,194 |   |                           | $      | 1,237,846 |   |   |   | -34 | % |   | $ | 1,819,122 |   |   | $ | 1,963,679 |   |   |   | -7 | % |

|   | (1) | Production is determined by multiplying the gross production volume of properties in which the Partnership has an interest by the percentage of the leasehold or other property interest the Partnership owns. |
|--------|-----|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | (2) | A ratio of energy content of natural gas and oil (six Mcf of natural gas equals one Bbl of oil) was used to obtain a conversion factor to convert oil production into equivalent Mcf of natural gas. |
|--------|-----|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | (3) | Production costs represent natural gas and oil operating expenses which include production taxes. |
|--------|-----|---------------------------------------------------------------------------------------------------|

|   | · | Bbl – One barrel or 42 U.S. gallons liquid volume |
|--------|--------|---------------------------------------------------------|

|   | · | MBbl – One thousand barrels |
|--------|--------|-----------------------------------|

|   | · | Mcf – One thousand cubic feet |
|--------|--------|-------------------------------------|

|   | · | MMcf – One million cubic feet |
|--------|--------|-------------------------------------|

|   | · | Mcfe – One thousand cubic feet of natural gas equivalents |
|--------|--------|-----------------------------------------------------------------|

|   | · | MMcfe – One million cubic feet of natural gas equivalents |
|--------|--------|-----------------------------------------------------------------|

|   | · | MMbtu – One million British Thermal Units |
|--------|--------|-------------------------------------------------|

----

Index

----

Index

|                                                                    |   | Three months ended June 30, |    |   | Six months ended June 30, |   |
|-------------------------------------------------------------------------|--------|----------------------------------|---------|--------|--------------------------------|--------|
| Commodity price risk management gain (loss), net                        |   | 2010                             |    |   | 2009                           |   |   | 2010 |   |   | 2009 |   |
| Realized gains (losses)                                                 |   |                             |    |   |                           |   |   |   |   |   |   |   |
| Oil                                                                     |   | $                                | 40,596  |   |                           | $      | 96,528 |   |   | $ | 78,593 |   |   | $ | 243,033 |   |
| Natural Gas                                                             |   |                             | (5,215  | )      |                           |   | 402,696 |   |   |   | 359,550 |   |   |   | 1,017,009 |   |
| Total realized gain, net                                                |   |                             | 35,381  |   |                           |   | 499,224 |   |   |   | 438,143 |   |   |   | 1,260,042 |   |
|                                                                    |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |
| Unrealized gains (losses)                                               |   |                             |    |   |                           |   |   |   |   |   |   |   |   |   |   |   |
| Reclassification of realized gains included in prior periods unrealized |   |                             | (26,499 | )      |                           |   | (536,765 | ) |   |   | (244,065 | ) |   |   | (1,004,354 | ) |
| Unrealized gain (loss) for the period                                   |   |                             | 288,936 |   |                           |   | (625,067 | ) |   |   | 1,132,434 |   |   |   | (959,202 | ) |
| Total unrealized gain (loss), net                                       |   |                             | 262,437 |   |                           |   | (1,161,832 | ) |   |   | 888,369 |   |   |   | (1,963,556 | ) |
| Commodity price risk management gain (loss), net                        |   | $                                | 297,818 |   |                           | $      | (662,608 | ) |   | $ | 1,326,512 |   |   | $ | (703,514 | ) |

----

Index

|                                                 |   |   | Collars             |    |   | Fixed-Price Swaps              |     |   | CIG Basis Protection Swaps  |   |   |                                 |   |
|------------------------------------------------------|--------|--------|---------------------|---------|--------|--------------------------------|----------|--------|-----------------------------|--------|--------|--------------------------------------|--------|
|                                                 |   |   |                |    |   |                           |     |   |                        |   |   |                                 |   |
| Commodity/Index                                      |   |   | Quantity(Gas-Mmbtu) |    |   | Weighted AverageContract Price |     |   | Quantity(Gas-MmbtuOil-Bbls) |   |   |  Weighted AverageContract Price |   |   | Quantity(Gas-Mmbtu) |   |   |  Weighted AverageContract Price |   |   |  Fair Value atJune 30, 2010(1) |   |
|                                                 |   |   |                | Floors  |   |                           | Ceilings |   |                        |   |   |                                 |   |   |   |   |   |   |
|                                                 |   |   |                |    |   |                           |     |   |                        |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Natural Gas                                          |   |   |                |    |   |                           |     |   |                        |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |   |   |
| CIG                                                  |   |   |                |    |   |                           |     |   |                        |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |   |   |
| 10/01 - 12/31/2010                                   |   |   |                | 31,772  |   |                           | $        | 4.75   |                        |   | $      | 9.45                                 |   |   |   | - |   |   | $ | - |   |   |   | - |   |   | $ | - |   |   | $ | 19,392 |   |
| 01/01 - 03/31/2011                                   |   |   |                | 47,658  |   |                           |     | 4.75   |                        |   |   | 9.45                                 |   |   |   | - |   |   |   | - |   |   |   | - |   |   |   | - |   |   |   | 23,749 |   |
|                                                 |   |   |                |    |   |                           |     |   |                        |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| NYMEX                                                |   |   |                |    |   |                           |     |   |                        |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| 07/01 - 09/30/2010                                   |   |   |                | -       |   |                           |     | -      |                        |   |   | -                                    |   |   |   | 100,666 |   |   |   | 5.56 |   |   |   | 109,211 |   |   |   | (1.88 | ) |   |   | (35,953 | ) |
| 10/01 - 12/31/2010                                   |   |   |                | 11,059  |   |                           |     | 5.75   |                        |   |   | 8.30                                 |   |   |   | 61,072 |   |   |   | 6.14 |   |   |   | 74,981 |   |   |   | (1.88 | ) |   |   | (4,020 | ) |
| 01/01 - 03/31/2011                                   |   |   |                | 15,000  |   |                           |     | 5.75   |                        |   |   | 8.30                                 |   |   |   | 37,185 |   |   |   | 6.83 |   |   |   | 52,185 |   |   |   | (1.88 | ) |   |   | (5,759 | ) |
| 04/01 - 06/30/2011                                   |   |   |                | -       |   |                           |     | -      |                        |   |   | -                                    |   |   |   | 99,783 |   |   |   | 6.78 |   |   |   | 99,783 |   |   |   | (1.88 | ) |   |   | 35,538 |   |
| 07/01 - 12/31/2011                                   |   |   |                | -       |   |                           |     | -      |                        |   |   | -                                    |   |   |   | 194,403 |   |   |   | 6.76 |   |   |   | 194,403 |   |   |   | (1.88 | ) |   |   | 3,220 |   |
|         2012-2013 |   |   |                | 24,034  |   |                           |     | 6.00   |                        |   |   | 8.27                                 |   |   |   | 672,367 |   |   |   | 7.05 |   |   |   | 696,401 |   |   |   | (1.88 | ) |   |   | (28,606 | ) |
| Total Natural Gas                                    |   |   |                | 129,523 |   |                           |     |   |                        |   |   |                                 |   |   |   | 1,165,476 |   |   |   |   |   |   |   | 1,226,964 |   |   |   |   |   |   |   | 7,561 |   |
|                                                 |   |   |                |    |   |                           |     |   |                        |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Oil                                                  |   |   |                |    |   |                           |     |   |                        |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| NYMEX                                                |   |   |                |    |   |                           |     |   |                        |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| 07/01 - 09/30/2010                                   |   |   |                | -       |   |                           |     | -      |                        |   |   | -                                    |   |   |   | 2,742 |   |   |   | 92.96 |   |   |   | - |   |   |   | - |   |   |   | 45,346 |   |
| 10/01 - 12/31/2010                                   |   |   |                | -       |   |                           |     | -      |                        |   |   | -                                    |   |   |   | 2,742 |   |   |   | 92.96 |   |   |   | - |   |   |   | - |   |   |   | 41,686 |   |
| 01/01 - 03/31/2011                                   |   |   |                | -       |   |                           |     | -      |                        |   |   | -                                    |   |   |   | 1,146 |   |   |   | 70.75 |   |   |   | - |   |   |   | - |   |   |   | (8,414 | ) |
| 04/01 - 06/30/2011                                   |   |   |                | -       |   |                           |     | -      |                        |   |   | -                                    |   |   |   | 1,171 |   |   |   | 70.75 |   |   |   | - |   |   |   | - |   |   |   | (9,539 | ) |
| 07/01 - 12/31/2011                                   |   |   |                | -       |   |                           |     | -      |                        |   |   | -                                    |   |   |   | 2,409 |   |   |   | 70.75 |   |   |   | - |   |   |   | - |   |   |   | (21,080 | ) |
| Total Oil                                            |   |   |                | -       |   |                           |     |   |                        |   |   |                                 |   |   |   | 10,210 |   |   |   |   |   |   |   | - |   |   |   |   |   |   |   | 47,999 |   |
|                                                 |   |   |                |    |   |                           |     |   |                        |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Total Natural Gas and Oil                            |   |   |                |    |   |                           |     |   |                        |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | $ | 55,560 |   |

----

Index

----

Index

|   | · | Natural gas and oil receivables decreased to $0.5 million as of June 30, 2010, from $0.6 million as of December 31, 2009. |
|--------|--------|---------------------------------------------------------------------------------------------------------------------------|

|   | · | Realized derivative gains receivables decreased by $0.3 million as of June 30, 2010. |
|--------|--------|--------------------------------------------------------------------------------------|

|   | · | Net short-term unrealized derivative gains receivable increased to $0.1 million as of June 30, 2010. |
|--------|--------|------------------------------------------------------------------------------------------------------|

|   | · | Due to Managing General Partner-other, net, excluding natural gas and oil sales received from third parties and realized derivative gains, decreased to a $0.2 million liability as of June 30, 2010, from a $0.3 million liability as of December 31, 2009. |
|--------|--------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

----

Index

| Three months  |   | Managing        |    |   | Investor      |   |      |          |   |
|---------------|--------|-----------------|---------|--------|---------------|--------|-----------|---------------|--------|
| ended         |   | General Partner |    |   | Partners      |   |      | Total         |   |
| June 30, |   | Distributions   |    |   | Distributions |   |      | Distributions |   |
|          |   |            |    |   |          |   |      |          |   |
| 2010          |   | $               | 163,639 |   |          | $      | 654,555   |          |   | $ | 818,194 |   |
|          |   |            |    |   |          |   |      |          |   |   |   |   |
| 2009          |   | $               | 247,569 |   |          | $      | 990,277   |          |   | $ | 1,237,846 |   |
|          |   |            |    |   |          |   |      |          |   |   |   |   |
|          |   |            |    |   |          |   |      |          |   |   |   |   |
| Six months    |   | Managing        |    |   | Investor      |   |      |          |   |   |
| ended         |   | General Partner |    |   | Partners      |   |      | Total         |   |
| June 30, |   | Distributions   |    |   | Distributions |   |      | Distributions |   |
|          |   |            |    |   |          |   |      |          |   |   |   |   |
| 2010          |   | $               | 363,825 |   |          | $      | 1,455,297 |          |   | $ | 1,819,122 |   |
|          |   |            |    |   |          |   |      |          |   |   |   |   |
| 2009          |   | $               | 392,735 |   |          | $      | 1,570,944 |          |   | $ | 1,963,679 |   |

|   | · | An increase in natural gas and oil sales receipts of $0.3 million, or 24%, accompanied by a decrease in natural gas and oil production costs of approximately $0.1 million, or 17% and a decrease in direct costs – general and administrative of $0.3 million, or 76%; |
|--------|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | · | A decrease in commodity price risk management realized gains receipts of $0.6 million or 46%; and |
|--------|--------|---------------------------------------------------------------------------------------------------|

|   | · | A decrease in the liability Due to Managing General Partner-other, net, excluding natural gas and oil sales received from third parties and realized derivative gains, of approximately $0.2 million. |
|--------|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

----

Index

----

Index

| Item 3. | Quantitative and Qualitative Disclosures About Market Risk |
|---------|------------------------------------------------------------|

|  Item 4T. | Controls and Procedures |
|----------------|-------------------------|

----

Index

| Item 1. | Legal Proceedings |
|---------|-------------------|

| Item 1A. | Risk Factors |
|----------|--------------|

| Item 2. | Unregistered Sales of Equity Securities and Use of Proceeds |
|---------|-------------------------------------------------------------|

| Period                                                   |   | Total Number of Units Repurchased |   |   | Average Price Paid per Unit |   |
|----------------------------------------------------------|--------|-----------------------------------|--------|--------|-----------------------------|--------|
|                                                     |   |                              |   |   |                        |   |
| April 1−30, 2010                                   |   |                              | 0.50   |   |                        | $      | 5,320 |   |
| May 1−31, 2010                                     |   |                              | -      |   |                        |   | - |   |
| June 1−30, 2010                                    |   |                              | 0.25   |   |                        |   | 5,060 |   |
| Total second quarter Unit Repurchase Program repurchases |   |                              | 0.75   |   |                        |   |   |   |

| Item 3. | Defaults Upon Senior Securities |
|---------|---------------------------------|

| Item 4. | [Removed and Reserved] |
|---------|------------------------|

| Item 5. | Other Information |
|---------|-------------------|

----

Index

| Item 6. | Exhibits |
|---------|----------|

| (a) | Exhibit Index. |
|-----|----------------|

|           |   |                                                                                                                                                                                                                                  |   | Incorporated by Reference |   |            |
|----------------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|---------------------------|--------|-----------------|
| Exhibit Number |   | Exhibit Description                                                                                                                                                                                                                   |   | Form                      |   | SEC File Number |   | Exhibit |   | Filing Date |   | Filed Herewith |
|           |   |                                                                                                                                                                                                                                  |   |                      |   |            |   |   |   |   |   |   |
| 2.1            |   | Agreement and Plan of Merger by and among PDC, DP 2004 Merger Sub, LLC and PDC 2004-D Limited Partnership                                                                                                                             |   | 8-K                       |   | 000-51221       |   | 2.1 |   | 06/09/2010 |   |   |
|           |   |                                                                                                                                                                                                                                  |   |                      |   |            |   |   |   |   |   |   |
| 3.1            |   | Limited Partnership Agreement                                                                                                                                                                                                         |   | PREM14A                   |   | 000-51221       |   | Annex F |   | 07/14/2010 |   |   |
|           |   |                                                                                                                                                                                                                                  |   |                      |   |            |   |   |   |   |   |   |
| 3.2            |   | Certificate of limited partnership which reflects the organization of the Partnership under West Virginia law                                                                                                                         |   | 10-K                      |   | 000-51221       |   | 3.2 |   | 08/05/2009 |   |   |
|           |   |                                                                                                                                                                                                                                  |   |                      |   |            |   |   |   |   |   |   |
| 10.1           |   | Drilling and operating agreement between the Partnership and PDC, as Managing General Partner of the Partnership                                                                                                                      |   | 10-K                      |   | 000-51221       |   | 10.1 |   | 08/05/2009 |   |   |
|           |   |                                                                                                                                                                                                                                  |   |                      |   |            |   |   |   |   |   |   |
| 31.1           |   | Rule 13a-14(a)/15d-14(c) Certification of Chief Executive Officer of Petroleum Development Corporation, the Managing General Partner of the Partnership as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.         |   |                      |   |            |   |   |   |   |   | X |
|           |   |                                                                                                                                                                                                                                  |   |                      |   |            |   |   |   |   |   |   |
| 31.2           |   | Rule 13a-14(a)/15d-14(c) Certification of Chief Financial Officer of Petroleum Development Corporation, the Managing General Partner of the Partnership as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.         |   |                      |   |            |   |   |   |   |   | X |
|           |   |                                                                                                                                                                                                                                  |   |                      |   |            |   |   |   |   |   |   |
| 32.1           |   | Title 18 U.S.C. Section 1350 (Section 906 of Sarbanes-Oxley Act of 2002) Certifications by Chief Executive Officer and Chief Financial Officer of Petroleum Development Corporation, the Managing General Partner of the Partnership. |   |                      |   |            |   |   |   |   |   | X |

----

Index

PDC 2004-D LIMITED PARTNERSHIP

| Signature                 |   | Title                                      | Date            |
|---------------------------|--------|--------------------------------------------|-----------------|
|                      |   |                                       |            |
| /s/ Richard W. McCullough |   | Chairman and Chief Executive Officer       | August 12, 2010 |
| Richard W. McCullough     |   | Petroleum Development Corporation          |            |
|                      |   | Managing General Partner of the Registrant |            |
|                      |   | (Principal executive officer)              |            |
|                      |   |                                       |            |
| /s/ Gysle R. Shellum      |   | Chief Financial Officer                    | August 12, 2010 |
| Gysle R. Shellum          |   | Petroleum Development Corporation          |            |
|                      |   | Managing General Partner of the Registrant |            |
|                      |   | (Principal financial officer)              |            |
|                      |   |                                       |            |
| /s/ R. Scott Meyers       |   | Chief Accounting Officer                   | August 12, 2010 |
| R. Scott Meyers           |   | Petroleum Development Corporation          |            |
|                      |   | Managing General Partner of the Registrant |            |
|                      |   | (Principal accounting officer)             |            |

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