FOURTH OMNIBUS AGREEMENT (SEVENTH AMENDMENT, FOURTH CONSENT AND FOURTH WAIVER)

Exhibit 10.8

FOURTH OMNIBUS AGREEMENT (SEVENTH AMENDMENT, FOURTH

CONSENT AND FOURTH WAIVER)

This FOURTH OMNIBUS AGREEMENT (SEVENTH AMENDMENT, FOURTH CONSENT AND FOURTH WAIVER) dated as of March 7, 2008 (this “Omnibus Agreement”), is by and among ASA OPCO HOLDINGS, LLC, a Delaware limited liability company (“ASA Holdings”), ASA ALBION, LLC, a Delaware limited liability company (“Albion”), ASA BLOOMINGBURG, LLC, a Delaware limited liability company (“Bloomingburg”), and ASA LINDEN, LLC, a Delaware limited liability company (“Linden” and, together with ASA Holdings, Albion and Bloomingburg, the “Borrowers”), ASA Holdings, as Borrowers’ Agent, each of the Lenders party hereto, WESTLB AG, New York Branch, as Administrative Agent for the Lenders (the “Administrative Agent”), FIRST NATIONAL BANK OF OMAHA, as Collateral Agent for the Senior Secured Parties (the “Collateral Agent”) and FIRST NATIONAL BANK OF OMAHA as Accounts Bank (the “Accounts Bank”).

WHEREAS, pursuant to the Credit Agreement, dated as of February 6, 2006 (as amended by the First Amendment to Credit Agreement, dated as of May 23, 2006, the Second Amendment to Credit Agreement, dated as of August 15, 2006, the Third Amendment to Credit Agreement, dated as of August 30, 2006, the Omnibus Agreement (Consent, Fourth Amendment and Second Waiver), dated as of November 30, 2006, the Second Omnibus Agreement (Second Consent, Fifth Amendment and Third Waiver), dated as of December 22, 2006, the Third Omnibus Agreement (Sixth Amendment and Consent), dated as of July 21, 2007, and as further amended, restated, supplemented or otherwise modified from time to time, the “Credit Agreement”), among the Borrowers, the Borrowers’ Agent, each of the Lenders from time to time party thereto, the Administrative Agent, the Collateral Agent, the Accounts Bank, WestLB AG, New York Branch, as Co-Syndication Agent, Lead Arranger, and Sole Lead Bookrunner, First National Bank of Omaha and Standard Chartered Bank, as Co-Syndication Agents and Lead Arrangers and CIT Capital USA INC. and ING Capital LLC, as Co-Documentation Agents and Lead Arrangers, the Lenders agreed to make a credit facility available to the Borrowers, subject to the terms and conditions set forth therein;

WHEREAS, pursuant to a letter dated February [    ], 2008 delivered by the Borrowers’ Agent to the Administrative Agent (the “Request Letter”), the Borrowers have requested, among other things, that the Lenders (i) grant certain consents requested by the Borrowers pursuant to the Credit Agreement, (ii) grant certain waivers under the Credit Agreement and (iii) agree to amend certain provisions of the Credit Agreement and other Financing Documents.

NOW, THEREFORE, in consideration of the premises and the mutual covenants contained in the Credit Agreement and herein, and other good and valuable

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consideration the receipt and adequacy of which are hereby acknowledged, the parties hereto agree as follows:

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5.    Amendments to the Financing Documents.    The parties hereto hereby agree to amend all of the Financing Documents in the manner set forth as follows:

6.    Representations and Acknowledgements.    Each of the Waiver and the Consent by the Lenders is made in reliance on each of the Borrowers’ representations and acknowledgements set forth in the Annexes hereto. In the event that any of the Borrowers’ representations and/or acknowledgements set forth in the Annexes hereto is false or inaccurate in any material respect as of the date hereof, the Waiver with respect to the Waived Provisions or the Consent with respect to the Consented Provisions, as applicable, in connection with which such representation and/or acknowledgement was made shall be deemed void ab initio; provided, that no such falsity or inaccuracy shall have any effect on the Consent with respect to the Consented Provisions (in the case of a falsity or inaccuracy relied upon to grant the Waiver of the Waived Provision) or the Waiver with respect to the Waived Provision (in the case of a falsity or inaccuracy relied upon to grant the Consent with respect to the Consented Provisions).

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7.    Certification by the Borrowers.    Each of the Waiver and the Consent by the Lenders is further made in reliance on the Borrowers’ certifications that (i) as of the date hereof, no Default or Event of Default has occurred and is continuing under the Credit Agreement, and (ii) all of the information provided in the Request Letter is true, complete and correct in all material respects.

8.    Limited Purpose; Effect on Credit Agreement.    Notwithstanding anything contained herein, the Waiver and the Consent contained in this Omnibus Agreement (i) are a limited waiver and consent, (ii) are effective only with respect to the transactions described in this Omnibus Agreement for the specific instance and the specific purpose for which they are given, (iii) shall not be effective for any other purpose or transaction, and (iv) do not constitute an amendment or basis for a subsequent waiver or consent of any of the provisions of the Credit Agreement. Except as expressly amended hereby or otherwise provided herein, (a) all of the terms and conditions of the Credit Agreement and all other Financing Documents remain in full force and effect, and none of such terms and conditions are, or shall be construed as, otherwise amended or modified, and (b) nothing in this Omnibus Agreement shall constitute a waiver by the Lenders of any Default or Event of Default or a waiver by the Lenders of any right, power or remedy available to the Lenders or the other Senior Secured Parties under the Credit Agreement, whether any such defaults, rights, powers or remedies presently exist or arise in the future. The Credit Agreement shall, together with the amendments set forth in this Omnibus Agreement, be read and construed as a single agreement. All references in the Credit Agreement and any related documents, instruments and agreements shall hereafter refer to the Credit Agreement, as amended hereby.

9.    Effective Date.    This Omnibus Agreement shall become effective as of the first date on which it has been executed by the Required Lenders, the Administrative Agent, the Accounts Bank, the Collateral Agent, each of the Borrowers and the Borrowers’ Agent.

10.    Financing Document.    The parties hereto agree that this Omnibus Agreement is a Financing Document.

11.    Authority; Etc.    The execution and delivery by each of the Borrowers and the Borrowers’ Agent of this Omnibus Agreement are within the organizational authority of each of them and have been duly authorized by all necessary organizational action on the part of, and have been duly and validly executed by, each Borrower and the Borrowers’ Agent.

12.    Miscellaneous.

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IN WITNESS WHEREOF, the parties hereto have caused this Fourth Omnibus Agreement (Seventh Amendment, Fourth Consent and Fourth Waiver) to be executed by their respective officers as of the day and year first above written.

[required signatures]

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