Document:

Exhibit
        10.18

      

      CONFIRMATION
        OF GAS PURCHASE AND SALES AGREEMENT

      DATED
        NOVEMBER 17, 2004 BETWEEN ATLAS RESOURCES, INC.
        ET. AL. 

      AND
        FIRST ENERGY SOLUTIONS CORP. 

      FOR
        THE PERIOD FROM APRIL 1, 2006 THROUGH MARCH 31, 2007 

      PRODUCTION/CALENDAR
        PERIODS

       

      
        
           

        

        
           

          
            

          

        

        
           

        

      

    

    

     

    
      
         

      

      
         

        
          

        

      

      
         

      

    

     

    

     

    
      
         

      

      
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        Page
          3Exhibit
      10.19

    

    

    TRANSACTION
      CONFIRMATION DATED DECEMBER 14, 2004 

    BETWEEN
      ATLAS AMERICA, INC. AND UGI ENERGY SERVICES, INC. D/B/A
      GASMARKExhibit
      10.21

    

    

    AMENDMENT
      AMONG ATLAS PIPELINE PARTNERS, L.P. AND ATLAS PIPELINE OPERATING PARTNERSHIP,
      L.P., ATLAS AMERICA, INC., RESOURCE ENERGY, INC., VIKING RESOURCES CORPORATION,
      ATLAS NOBLE CORP., AND ATLAS RESOURCES, INC. TO THE MASTER NATURAL GAS GATHERING
      AGREEMENT DATED FEBRUARY 2, 2000 AND THE NATURAL GAS GATHERING AGREEMENT DATED
      JANUARY 1, 2002Exhibit
        10.22

      

      

      CONTRIBUTION,
        CONVEYANCE AND ASSUMPTION AGREEMENT DATED DECEMBER 18, 2006 AMONG ATLAS AMERICA,
        INC., ATLAS ENERGY RESOURCES, LLC, AND ATLAS ENERGY OPERATING COMPANY,
        LLCExhibit
      10.23

     

     

    OMNIBUS
      AGREEMENT DATED DECEMBER 18, 2006 BETWEEN 

    ATLAS
      ENERGY RESOURCES, LLC AND ATLAS AMERICA, INC.Exhibit
        10.24

      

      MANAGEMENT
        AGREEMENT DATED DECEMBER 18, 2006

      AMONG
        ATLAS ENERGY RESOURCES, LLC, ATLAS ENERGY 

      OPERATING
        COMPANY, LLC, AND 

      ATLAS
        ENERGY MANAGEMENT, INC.

       

      
        
           

        

        
           

          
            

          

        

        
           

        

      

    

    

     

    
      
         

      

      
         

        
          

        

      

      
         

      

    

     

    

     

    
      
         

      

      
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        16Exhibit
      10.25

     

    AMENDMENT
      AND JOINDER TO OMNIBUS AGREEMENT

     DATED
      DECEMBER 18, 2006, AMONG ATLAS PIPELINE 

    PARTNERS,
      L.P. AND ATLAS PIPELINE OPERATING

     PARTNERSHIP,
      L.P., ATLAS AMERICA, INC., RESOURCE 

    ENERGY,
      LLC, VIKING RESOURCES, LLC, ATLAS ENERGY 

    RESOURCES,
      LLC, AND ATLAS ENERGY OPERATING 

    COMPANY,
      LLCExhibit
      10.26

     

    AMENDMENT
      AND JOINDER TO GAS GATHERING 

    AGREEMENTS
      DATED DECEMBER 18, 2006, AMONG 

    ATLAS
      PIPELINE PARTNERS, L.P. AND ATLAS PIPELINE OPERATING 

    PARTNERSHIP,
      L.P., ATLAS AMERICA, INC., 

    RESOURCE
      ENERGY, LLC, VIKING RESOURCES, LLC, 

    ATLAS
      NOBLE, LLC, ATLAS RESOURCES, LLC, ATLAS AMERICA, LLC, 

    ATLAS
      ENERGY RESOURCES, LLC, AND 

    ATLAS
      ENERGY OPERATING COMPANY, LLC

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    AMENDMENT
      AND JOINDER TO GAS GATHERING AGREEMENTS  

     

    THIS
      AMENDMENT AND JOINDER TO GAS GATHERING AGREEMENTS
      (this
“Amendment”)
      is
      made as of December 18, 2006, among Atlas Pipeline Partners, L.P., a Delaware
      limited partnership, and Atlas Pipeline Operating Partnership, L.P., a Delaware
      limited partnership (collectively, “Gatherer”),
      Atlas
      America, Inc., a Delaware corporation (“Atlas
      America”),
      Resource Energy, LLC, a Delaware limited liability company (formerly Resource
      Energy, Inc., “Resource
      Energy”),
      Viking Resources, LLC, a Pennsylvania limited liability company (formerly Viking
      Resources Corporation, “Viking
      Resources”),
      Atlas
      Noble, LLC, a Delaware limited liability company (formerly Atlas Noble
      Corporation, “Atlas
      Noble”),
      Atlas
      Resources, LLC, a Pennsylvania limited liability company (formerly Atlas
      Resources, Inc., “Atlas
      Resources”),
      Atlas
      America, LLC, a Pennsylvania limited liability company (formerly Atlas America,
      Inc., “Atlas
      PA”),
      Atlas
      Energy Resources, LLC, a Delaware limited liability company (“Atlas
      Energy”),
      and
      Atlas Energy Operating Company, LLC, a Delaware limited liability company
      (“Energy
      Operating”).
      

     

    RECITALS
       

     

    A.
      Gatherer and Atlas America, Resource Energy and Viking Resources are parties
      to
      the Master Natural Gas Gathering Agreement dated February 2, 2000 (as amended
      as
      of October 25, 2005, the “2000
      Gathering Agreement”)
      and
      desire to amend the same in accordance with the terms hereof. 

     

    B.
      Gatherer and Atlas America (as successor to Atlas Energy Group, Inc.), Atlas
      Resources, Atlas Noble, Resource Energy and Viking Resources are parties to
      the
      Natural Gas Gathering Agreement dated January 1, 2002 (as amended as of October
      25, 2005, the “2002
      Gathering Agreement”
and
      with the 2000 Gathering Agreement, the “Gathering
      Agreements”)
      and
      desire to amend the same in accordance with the terms hereof. 

     

    C.
      Atlas
      America has formed Atlas Energy and Energy Operating for the purpose of
      facilitating the initial public offering of Atlas Energy and, pursuant to the
      Contribution and Assumption Agreement of even date herewith, is transferring
      all
      of the issued and outstanding member interests in Resource Energy, Viking
      Resources, Atlas Noble, Atlas Resources and Atlas PA to Energy Operating, and
      the parties hereto wish to join Atlas Energy and Energy Operating to the
      Gathering Agreements. 

     

    NOW,
      THEREFORE,
      in
      consideration of the premises, and the mutual covenants and agreements herein
      set forth, and intending to be legally bound, the parties agree as follows:
      

     

    1.
      Joinder in the Gathering Agreements. Effective as of the date hereof, each
      of
      Atlas Energy and Energy Operating hereby joins each of the Gathering Agreements
      and accepts and agrees to be bound as a “Shipper” thereunder with respect to all
      of the terms and conditions
      thereof, and Gatherer hereby consents to such joinder and agrees that Atlas
      Energy and Energy Operating are parties to the Gathering Agreements as the
      Shipper thereunder. 

     

    
      
         

      

      
         

        
          

        

      

      
         

      

    

     

    2.
      Removal of Atlas America from and Joinder of Atlas PA to the 2002 Gathering
      Agreement. Effective as of the date hereof, Atlas America is hereby removed
      as a
      party to the 2002 Gathering Agreement and shall have no further rights or
      obligations thereunder. Atlas PA hereby joins the 2002 Gathering Agreement
      and
      agrees to be bound as a “Shipper” thereunder with respect to all of the terms
      and conditions thereof, and Gatherer hereby consents to such joinder and agrees
      that Atlas PA is party to the 2002 Gathering Agreement as the Shipper
      thereunder. 

     

    3.
      Definition of “Investment Program.” The definition of “Investment Program” set
      forth in the 2000 Gathering Agreement is hereby amended and restated in its
      entirety as follows: “Investment
      Program”
means
      a
      Person principally engaged in the drilling of natural gas and oil wells for
      which Shipper or direct or indirect subsidiary of Shipper acts as a general
      partner, managing partner or manager and the securities of which have been
      offered and sold to investors. 

     

    4.
      Other
      Terms of Gathering Agreements. Except as otherwise expressly provided herein,
      the Gathering Agreements are not amended, modified or affected by this
      Amendment. 

     

    5.
      Counterparts. This Amendment may be executed in any number of counterparts
      and
      by different parties hereto in separate counterparts, each of which when so
      executed and delivered shall be deemed to be an original and all of which taken
      together shall constitute but one and the same instrument. Delivery of an
      executed counterpart of this Amendment by facsimile shall be equally as
      effective as delivery of a manually executed counterpart of this Amendment.
      

     

    [Signatures
      appear on following pages]

     

    
      
         

      

      
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    IN
      WITNESS WHEREOF,
      the
      parties have executed this Amendment to be effective as of the date first
      written above. 

    
      	 	 	 
	 	
              Shipper:

               

              
                ATLAS
                  AMERICA, INC.

              

            
	 
 	 
 	 
 
	
            	By:  	
            
	 	
              

              Name:
                

              Its:

            

    

     

    
      	 	 	 
	 	
              
                ATLAS
                  ENERGY RESOURCES, LLC

              

            
	 
 	 
 	 
 
	
            	By:  	
            
	 	
              

              Name:
                

              Its:

            

    

     

    
      	 	 	 
	 	
              ATLAS
                ENERGY OPERATING COMPANY, LLC

              
                
                   

                  
                    By:
                      Atlas Energy Resources, LLC, its sole
                      member

                  

                

              

            
	 
 	 
 	 
 
	
            	By:  	
            
	 	
              

              Name:
                

              Its:

            

    

     

    
      	 	 	 
	 	
              RESOURCE
                ENERGY, LLC

               

              
                By:
                  Atlas Energy Operating Company, LLC, its sole member

                 

                
                  By:
                    Atlas Energy Resources, LLC, its sole
                    member

                

              

            
	 
 	 
 	 
 
	
            	By:  	
            
	 	
              

              Name:
                

              Its:

            

    

     

    
      
         

      

      
        3

        
          

        

      

      
         

      

    

     

    
      	 	 	 
	 	
              
                VIKING
                  RESOURCES, LLC

                 

                By:
                  Atlas Energy Operating Company, LLC, its sole member

                 

                By:
                  Atlas Energy Resources, LLC, its sole
                  member

              

            
	 
 	 
 	 
 
	
            	By:  	
            
	 	
              

              Name:
                

              Its:

            

    

     

    
      	 	 	 
	 	
              
                ATLAS
                  NOBLE, LLC

                 

                By:
                  Atlas Energy Operating Company, LLC, its sole member

                 

                By:
                  Atlas Energy Resources, LLC, its sole
                  member

              

            
	 
 	 
 	 
 
	
            	By:  	
            
	 	
              

              Name:
                

              Its:

            

    

     

    
      	 	 	 
	 	
              
                
                  ATLAS
                    RESOURCES, LLC

                   

                  By:
                    AIC, LLC, its sole member

                   

                  By:
                    Atlas Energy Operating Company, LLC, its sole member

                   

                  By:
                    Atlas Energy Resources, LLC, its sole
                    member

                

              

            
	 
 	 
 	 
 
	
            	By:  	
            
	 	
              

              Name:
                

              Its:

            

    

     

    
      	 	 	 
	 	
              
                
                  ATLAS
                    AMERICA, LLC

                   

                  By:
                    Atlas Energy Operating Company, LLC, its sole member

                   

                  By:
                    Atlas Energy Resources, LLC, its sole
                    member

                

              

            
	 
 	 
 	 
 
	
            	By:  	
            
	 	
              

              Name:
                

              Its:

            

    

     

    
      	 	 	 
	 	
              
                
                  ATLAS
                    AMERICA, LLC

                   

                  By:
                    Atlas Energy Operating Company, LLC, its sole member

                   

                  By:
                    Atlas Energy Resources, LLC, its sole
                    member

                

              

            
	 
 	 
 	 
 
	
            	By:  	
            
	 	
              

              Name:
                

              Its:

            

    

    
       

      
         

      

      
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                    Gatherer:

                     

                    ATLAS
                      PIPELINE OPERATING PARTNERSHIP, L.P.

                     

                    By:
                      Atlas Pipeline Partners GP, LLC, its general
                      partner

                  

                

              

            
	 
 	 
 	 
 
	
            	By:  	
            
	 	
              

              Name:
                

              Its:

            

    

     

    
      	 	 	 
	 	
              
                
                  
                    
                      ATLAS
                        PIPELINE PARTNERS, L.P.

                       

                      By:
                        Atlas Pipeline Partners GP, LLC, its general partner
                        

                    

                  

                

              

            
	 
 	 
 	 
 
	
            	By:  	
            
	 	
              

              Name:
                

              Its:

            

    

     

    
      
         

      

      
        5

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