EXHIBIT 4.9(a) AMENDED AND RESTATED CREDIT AGREEMENT dated as of November 25, 1997, as amended and restated February 5, 1999, among EQUISTAR CHEMICALS, LP, a Delaware limited partnership; MILLENNIUM AMERICA INC., a Delaware corporation, as Guarantor; the Lenders party thereto; BANK OF AMERICA NATIONAL TRUST AND SAVINGS ASSOCIATION as Servicing Agent, Documentation Agent and Administrative Agent; and THE CHASE MANHATTAN BANK, as Syndication Agent and Administrative Agent. WHEREAS, the Borrower (such term and each other capitalized term used but not defined herein having the meaning assigned to it in the Credit Agreement as amended and restated hereby, the "Amendment and Restatement"), the Lenders, BofA and Chase are parties to the Credit Agreement dated as of November 25, 1997 (the "Credit Agreement"); WHEREAS, the Borrower has requested that the Lenders amend and restate the Credit Agreement; and WHEREAS, the undersigned Lenders are willing, on the terms and subject to the conditions set forth herein, to approve such Amendment and Restatement; NOW, THEREFORE, in consideration of these premises, the Borrower, Millennium America Inc. and the undersigned Lenders hereby agree as follows: SECTION 1. Amendments. Effective as of the Amendment and Restatement Effective Date (as defined in Section 3 hereof), the Credit Agreement is hereby amended and restated in its current form with the following amendments: (a) The following definitions are added to Section 1.01 of the Credit Agreement in their appropriate alphabetical positions: "Assumed Occidental Liabilities" shall mean amounts due under the Lease Intended for Security, Corpus Christi Ethylene Cracking Facility, dated December 18, 1991, among Oxy Petrochemicals Inc., as assignee of Occidental Chemical Corporation, as Lessee, the institutions listed on the Schedule I thereto, as Lessors, Norwest Bank Minnesota, N.A., as Agent and Chemical Bank and the Bank of Nova Scotia, as Information Agents, as amended and supplemented from time to time. "Equistar GP" shall mean any general partner of the Borrower. "Occidental Asset Contribution Agreement" means the Agreement and Plan of Merger and Asset Contribution dated as of May 15, 1998, among 2 Occidental GP, Occidental LP1, Occidental LP2, Oxy Petrochemicals Inc. and the Borrower. (b) The definition of "Applicable Percentage" in Section 1.01 of the Credit Agreement is hereby amended by (i) replacing the table contained therein with the following table: Facility Index LIBOR/NIBOR Fee Ratings Spread Percentage ------- ----------- ---------- Category 1 .285% .090% A-/A3 or higher Category 2 .375% .125% BBB+/Baa1 Category 3 .475% .150% BBB/Baa2 Category 4 .675% .200% BBB-/Baa3 Category 5 .775% .225% BBB-/Ba1 or BB+/Baa3 Category 6 1.000% .250% BB+/Ba1 Category 7 1.200% .300% BB/Ba2 or lower - -------------------------------------------------------- (ii) replacing the number "6" at the end of clause (i) thereof with the number "7" and (iii) inserting immediately before the semicolon at the end of clause (ii) thereof the following: "(except that for purposes of this clause (ii), Category 5 shall be disregarded in determining the number of Categories by which the Index Ratings differ)". (c) The definition of "Change in Control" in Section 1.01 of the Credit Agreement is hereby amended by replacing the definition in its entirety with the following: A "Change in Control" shall occur if at any time Lyondell, Millennium and Occidental cease to own in the aggregate, through ownership by one or more of them, partnership interests representing at least a majority of the total equity interest and voting power of the Borrower. (d) The second proviso in the definition of "EBITDA" in Section 1.01 of the Credit Agreement is hereby amended to read as follows: "provided further, that after December 31, 1998, such addition may only be made in the calculation of EBITDA for each of two fiscal quarters during the remaining term of this Agreement and any such addition may only be made for one fiscal quarter during any four consecutive fiscal quarters." 3 (e) The Interest Coverage Ratio in Section 6.05 of the Credit Agreement is hereby amended by inserting at the end thereof, the following: "except that for any period of four consecutive fiscal quarters ending on any date set forth below, the Interest Coverage Ratio shall not be less than the ratio set forth below opposite such date: Date Ratio - ---- ------ March 31, 1999. . . . . . . . . . . . . . . .2.50 to 1.0 June 30, 1999 . . . . . . . . . . . . . . . .2.25 to 1.0 September 30, 1999. . . . . . . . . . . . . .2.00 to 1.0 December 31, 1999 . . . . . . . . . . . . . .2.00 to 1.0 March 31, 2000. . . . . . . . . . . . . . . .2.15 to 1.0 June 30, 2000 . . . . . . . . . . . . . . . .2.25 to 1.0 September 30, 2000. . . . . . . . . . . . . .2.50 to 1.0 December 31, 2000 . . . . . . . . . . . . . .2.75 to 1.0 (f) Section 10.15(a) of the Credit Agreement is hereby amended by replacing "Lyondell GP or Millennium GP, or any of their Affiliates" with "any Equistar GP or any of its Affiliates" (g) Section 10.15(b) of the Credit Agreement is hereby amended by replacing all the text immediately after the first sentence thereof with the following: "The Occidental Asset Contribution Agreement contains provisions under which the Borrower would be obligated to reimburse Occidental for any amounts paid by Occidental or its Affiliates on account of the fixed rent, purchase obligation and variable rent on the Assumed Occidental Liabilities. The Lenders acknowledge and agree that the obligations of the Borrower in respect of any such reimbursement obligations will rank pari passu with the Obligations" SECTION 3. Effectiveness. This Amendment and Restatement shall become effective as of the date (the "Amendment and Restatement Effective Date") when the Administrative Agents (or their counsel) shall have received copies hereof that, when taken together, bear the signatures of the Borrower and the Required Lenders. SECTION 4. Amendment and Restatement Fee. The Borrower shall pay to the Administrative Agents on the Amendment and Restatement Effective Date a fee as separately agreed to for the account of each Lender executing this Amendment and Restatement. SECTION 5. Applicable Law. This Amendment and Restatement shall be construed in accordance with and governed by the law of the State of New York. SECTION 6. No Other Amendments. Except as expressly set forth herein, this Amendment and Restatement shall not by implication or otherwise limit, impair, constitute a waiver of, or otherwise affect the rights and remedies of any party under, the Credit Agreement, nor alter, modify, amend or in any way affect any of the terms, conditions, obligations, covenants or agreements contained in the Credit Agreement, all of which are ratified and 4 affirmed in all respects and shall continue in full force and effect. This Amendment and Restatement shall apply and be effective only with respect to the provisions of the Credit Agreement specifically referred to herein. SECTION 7. Counterparts. This Amendment and Restatement may be executed in two or more counterparts, each of which shall constitute an original, but all of which when taken together shall constitute but one contract. Delivery of an executed counterpart of a signature page of this Amendment and Restatement by facsimile transmission shall be as effective as delivery of a manually executed counterpart of this Amendment and Restatement. SECTION 8. Headings. Section headings used herein are for convenience of reference only, are not part of this Amendment and Restatement and are not to affect the construction of, or to be taken into consideration in interpreting, this Amendment and Restatement. SECTION 9. Expenses. The Borrower shall reimburse the Administrative Agents for their reasonable out-of-pocket expenses incurred in connection with this Amendment and Restatement, including the reasonable fees and expenses of Cravath, Swaine & Moore, counsel for the Administrative Agents. IN WITNESS WHEREOF, the Borrower, Millennium America Inc. and the undersigned Lenders have caused this Amendment and Restatement to be duly executed by their duly authorized officers, all as of the date first above written. EQUISTAR CHEMICALS, LP by /s/ EUGENE R. ALLSPACH ---------------------------- Name: Eugene R. Allspach Title: President MILLENNIUM AMERICA, INC. by /s/ CHRISTINE WUBBOLDING ---------------------------- Name: Christine Wubbolding Title: Vice President and Treasurer 5 BANK OF AMERICA NATIONAL TRUST AND SAVINGS ASSOCIATION, individually and as Administrative Agent, Documentation Agent and Servicing Agent, by /s/ Michael J. Dillon ---------------------------- Name: Michael J. Dillon Title: Managing Director THE CHASE MANHATTAN BANK, individually and as Administrative Agent and Syndication Agent, by /s/ Mary Elizabeth Swerz ---------------------------- Name: Mary Elizabeth Swerz Title: Vice President ABN AMRO BANK N.V., by /s/ Collis G. Sanders ---------------------------- Name: Collis G. Sanders Title:Senior Vice President & Managing Director by /s/ Gordon D. Chang ---------------------------- Name: Gordon D. Chang Title: Vice President 6 BANK AUSTRIA AG, by /s/ R. Tenhave ---------------------------- Name: R. Tenhave Title: Senior Vice President /s/ Karen L. Jill ---------------------------- Name: Karen L. Jill Title: Assistant Vice President THE BANK OF NEW YORK, by /s/ Raymond J. Palmer --------------------------- Name: Raymond J. Palmer Title: Vice President THE BANK OF NOVA SCOTIA, by /s/ F. C. H. Ashby ------------------------- Name: F. C. H. Ashby Title: Senior Manger Loan Operations THE BANK OF TOKYO-MITSUBISHI, by /s/ Ichiro Otani ------------------------ Name: Ichiro Otani Title: Deputy General Manager 7 BANQUE NATIONALE DE PARIS, by /s/ John Stacy ------------------------- Name: John Stacy Title: Vice President CIBC INC., by CIBC OPPENHEIMER CORP, as Agent, by /s/ Ihor Zaluckyj ------------------------- Name: Ihor Zaluckyj Title: Executive Director COMMERZBANK AG, by /s/ W. David Suttles ------------------------- Name: W. David Suttles Title: Vice President by /s/ D. L. Ward ------------------------- Name: D. L. Ward Title: Assistant Treasurer CREDIT LYONNAIS NEW YORK BRANCH, by /s/ Phillippe Soustra ------------------------- Name: Phillippe Soustra Title: Senior Vice President 8 THE DAI-ICHI-KANGO BANK, LTD., by /s/ Timothy White ------------------------- Name: Timothy White Title: Senior Vice President DEUTSCHE GENOSSENSCHAFTS BANK AG, by /s/ Mark Connelly ------------------------- Name: Mark Connelly Title: Vice President by /s/ Elizabeth L. Ryan ------------------------ Name: Elizabeth L. Ryan Title: Vice President THE FIRST NATIONAL BANK OF CHICAGO, by /s/ Dixon P. Schultz ------------------------ Name: Dixon P. Schultz Title: First Vice President 9 THE INDUSTRIAL BANK OF JAPAN, LTD., by /s/ Mike Oakes ------------------------ Name: Mike Oakes Title: Senior Vice President Houston Office KBC BANK N. V., by /s/ Robert Snauffer ------------------------- Name: Robert Snauffer Title: First Vice President by /s/ Marcel Claes ------------------------- Name: Marcel Claes Title: Deputy General Manager THE LONG-TERM CREDIT BANK OF JAPAN, LIMITED, by /s/ Sadao Muraoko -------------------------- Name: Sadao Muraoko Title: Head of Southwest Region 10 MARINE MIDLAND BANK, by /s/ George Linhart -------------------------- Name: George Linhart Title: Relationship Manager MORGAN GUARANTY TRUST COMPANY OF NEW YORK, by /s/ Anna Marie Fallon ---------------------------- Name: Anna Marie Fallon Title: Vice President NATIONSBANK, N.A., by /s/ Michael J. Dillon ---------------------------- Name: Michael J. Dillon Title: Managing Director PNC BANK, by /s/ Marc T. Kennedy --------------------------- Name: Marc T. Kennedy Title: Vice President THE SANWA BANK LIMITED, by /s/ Jean-Michel Fatovic ---------------------------- Name: Jean-Michel Fatovic Title: Vice President 11 SOCIETE GENERALE, by /s/ Karen M. Sager -------------------------- Name: Karen M. Sager Title: Vice President THE SUMITOMO BANK, LTD., by /s/ J. Bruce Meredith ---------------------------- Name: J. Bruce Meredith Title: Senior Vice President SUNTRUST BANK, ATLANTA, by /s/ M. Anne Ford ------------------------------ Name: M. Anne Ford Title: Corporate Banking Officer by /s/ Steven J. Newby ------------------------------ Name: Steven J. Newby Title: Corporate Banking Officer THE TORONTO-DOMINION BANK, by /s/ Sonja R. Jordan --------------------------- Name: Sonja R. Jordan Title: Manager, Credit Administration WESTDEUTSCHE LANDESBANK GIROZENTRALE, NEW YORK BRANCH, by /s/ Felicia LaForgia --------------------------- Name: Felicia LaForgia Title: Vice President by /s/ Thomas Lee -------------------------- Name: Thomas Lee Title: Associate