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|   | 2. | The      "Cost" of acquisition of the Prospect including: (a) the price paid by PDC      for such property; (b) title examination, abstracting, brokers      commissions, filing fees, recording costs, transfer taxes, and other      charges incurred in connection with the acquisition of the property; (c)      bonuses, rentals and ad valorem taxes paid by PDC with respect to the      Prospect to the date of its transfer to the Partnership, interest on funds      used to acquire or maintain such property, and such portion of PDC's      expenses for geological, drafting, accounting, legal and other like      services allocated to the Prospect in accordance with generally accepted      accounting principles, not including for expenses incurred in the prior      drilling of wells, and provided such expenses shall have been incurred not      more than 36 months prior to the purchase by the  program. |
|--------|----|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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|   | 1. | The      Cost of the Prospect, as defined; |
|--------|----|--------------------------------------------|

|   | 2. | The      intangible costs of drilling and completing the well, including the      Managing General Partner's compensation for acting as operator, equal to      12.6% of the total direct well cost if the investor partners' interest in      the well is 63%, and proportionally reduced if the tangible costs exceed      37% of the direct well costs on average for the Partnership's wells, so      that the Managing General Partner's contribution to and interest in the      Partnership is increased above 37%;and |
|--------|----|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | 3. | The      tangible Costs of drilling and completing the Partnership wells and of      gathering pipelines necessary to connect the well to the nearest      appropriate sales point or deliverypoint. |
|--------|----|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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|   | 1. | In      the case of gas wells, when gas is first delivered from the well through a      pipeline or other delivery system to a  purchaser; |
|--------|----|--------------------------------------------------------------------------------------------------------------------------------------------|

|   | 2. | In      the case of oil wells, when the well has produced 100 barrels;      or |
|--------|----|--------------------------------------------------------------------------------|

|   | 3. | In      the case of combination wells, when either of criteria have been      satisfied. |
|--------|----|------------------------------------------------------------------------------------------|

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|   | Petroleum      Development Corporation, Managing General Partner of Rockies Region 2006      Limited Partnership, P.O. Box 26 Bridgeport, WV  26330 |
|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------|

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| /s/      Darwin L. Stump                    |
|---------------------------------------------|
| Darwin      L. Stump,                       |
| CFO      and Treasurer                      |
| Petroleum      Development Corporation      |
|                                        |
| /s/      Steven R. Williams                 |
| Steven      R. Williams, CEO                |
| Petroleum      Development Corporation      |
| Managing      General Partner of            |
| Rockies      Region 2006 LimitedPartnership |

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