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**Exhibit      10.7**

**FIRST      AMENDMENT TO THE**

**FIRST      AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP OF**

**RIO      VISTA OPERATING PARTNERSHIP L.P.**

|   | “(d) | the                sale of all or substantially all of the assets and properties of                the                Partnership Group.” |
|--------|------------|-------------------------------------------------------------------------------------------------------------------------------------------------|

|   | “(d) | the                distribution to the Partners of all or substantially all of the net                proceeds from the sale of all or substantially all of the assets                and                properties of the Partnership.” |
|--------|------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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|   | **GENERAL                PARTNER:**                 |                                                 |
|--------|-----------------------------------------------------|------------------------------------------------------|
|   |                                                |                                                 |   |
|   | RIO                VISTA OPERATING GP LLC,          |                                                 |
|   | a                Delaware limited liability company |                                                 |
|   |                                                |                                                 |   |
|   |                                                |                                                 |   |
|   | By:                                                 | /s/              Charles C. Handly                   |   |
|   |                                                | Charles                C. Handly, President          |   |
|   |                                                |                                                 |   |
|   |                                                |                                                 |   |
|   |                                                |                                                 |   |
|   | **LIMITED                PARTNER**:                 |                                                 |
|   |                                                |                                                 |   |
|   | RIO                VISTA ENERGY PARTNERS L.P.,      |                                                 |
|   | a                Delaware limited partnership       |                                                 |
|   |                                                |                                                 |   |
|   | By:                                                 | Rio                Vista GP LLC, its General Partner |   |
|   |                                                |                                                 |   |
|   |                                                |                                                 |   |
|   | By:                                                 | /s/              Charles C. Handly                   |   |
|   |                                                | Charles              C. Handly, President            |   |

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