EXHIBIT 10.5 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT AMENDMENT NO. 4 AND WAIVER (this "Amendment"), dated as of November 8, 1999, to and under the Amended and Restated Revolving Credit Agreement, as amended by Amendment No. 1 and Consent No. 1, dated as of August 5, 1998, Amendment No. 2, dated as of November 12, 1998, and Amendment No. 3 and Waiver, dated as of August 9, 1999 (the "Third Amendment and Waiver") (as so amended, the "Revolving Credit Agreement"), dated as of April 30, 1998, by and among TOTAL RENAL CARE HOLDINGS, INC., a Delaware corporation (the "Borrower"), the lenders party thereto (the "Lenders"), DLJ CAPITAL FUNDING, INC., as Syndication Agent, FIRST UNION NATIONAL BANK, as Documentation Agent, and THE BANK OF NEW YORK, as administrative agent (in such capacity, the "Administrative Agent"). RECITALS I. Capitalized terms used herein which are not otherwise defined herein shall have the respective meanings ascribed thereto in the Revolving Credit Agreement. II. The Borrower has requested that the Administrative Agent and the Lenders agree to amend and waive certain provisions under the Revolving Credit Agreement upon the terms and conditions contained herein, and the Administrative Agent and the Required Lenders are willing to so agree. Accordingly, in consideration of the Recitals and the covenants and conditions hereinafter set forth, and for other good and valuable consideration, the receipt and adequacy of which are hereby acknowledged, the parties hereto hereby agree as follows: 1. The Administrative Agent and the Required Lenders hereby waive compliance with Section 7.15 of the Revolving Credit Agreement from and including September 30, 1999 through and including March 15, 2000 (the "Waiver Period"), provided that each of the following conditions (the "Waiver Conditions") shall be, and shall at all times remain, satisfied: (a) the Leverage Ratio (calculated so as to exclude, to the extent included therein, certain one-time charges related to the fiscal quarter of the Borrower ended on September 30, 1999 (consisting of approximately: $10,000,000 relating to the write-off of certain accounts receivable at the Borrower's Minnesota laboratory, $3,200,000 relating to certain fees and expenses paid in connection with the August 9, 1999 amendments and waivers to the Revolving Credit Agreement and the Term Loan Facility, $2,580,000 relating to certain severance charges; $730,000 relating to certain aircraft, $540,000 relating to the settlement of a certain workers compensation claim in respect of RTC, and $130,000 relating to certain employment retention bonuses) in an aggregate amount not to exceed $17,200,000 on a pre-tax basis (the "One-Time Charges")) during the Waiver Period shall not exceed 4.80:1.00 at any time, (b) the Aggregate Credit Exposure of all Lenders during the Waiver Period shall not exceed $650,000,000 at any time, (c) in addition to the terms, conditions and restrictions contained in the Revolving Credit Agreement, the use by the Borrower and any of its Subsidiaries of cash (including, without limitation, the proceeds of all Loans) during the period from July 1, 1999 through and including March 15, 2000 shall be solely for: (i) the ordinary working capital purposes of the Borrower and its Subsidiaries, (ii) Permitted Acquisitions, and (iii) other capital expenditures and corporate purposes of the Borrower and its Subsidiaries in amounts that do not materially exceed those outlined in the cash flow forecast of the Borrower distributed to the Lenders on October 27, 1999, (d) in addition to the terms, conditions and restrictions contained in the Revolving Credit Agreement, the total consideration for (i) all Permitted Acquisitions made after July 1, 1999 through and including March 15, 2000 (excluding the Permitted Acquisitions set forth in Annex I attached hereto) shall not exceed in the aggregate $10,000,000, and (ii) all Foreign Acquisitions made after July 1, 1999 through and including March 15, 2000 shall not exceed in the aggregate $5,000,000, (e) for purposes of determining the Commitment Fee during the Waiver Period, the Leverage Ratio shall be calculated without excluding the One-Time Charges as defined in the Third Amendment and Waiver (prior to giving effect to this Amendment) and as defined in this Amendment, and (f) during the period from July 1, 1999 through and including March 15, 2000 capital expenditures of the Borrower and its Subsidiaries (on a Consolidated basis determined in accordance with GAAP) attributable to the creation of new renal treatment centers or the relocation or expansion of existing renal treatment centers shall not exceed in the aggregate $40,000,000. 2. Provided that each of the Waiver Conditions shall be, and shall at all times remain, satisfied, the Administrative Agent and the Required Lenders hereby waive any Default or Event of Default that may have occurred prior to the effectiveness of this Amendment (a) under or in connection with Section 4.21 or 7.2(a), (b) due to any misrepresentation or miscertification made in (i) any Borrowing Request, Notice of Conversion/Continuation or Letter of Credit Request delivered to the Administrative Agent during the period from and including September 30, 1999 to but excluding the effective date of this Amendment, or (c) under or in connection with Section 9.1(g)(iii) or 9.1(k)(ii) as a result of any defaults that may have arisen under the Term Loan Facility that will be waived pursuant to the Term Loan Waiver (as defined below). 3. Effective at all times on and after September 30, 1999, clause (a) of the definition of "Applicable Margin" contained in Section 1.1 of the Revolving Credit Agreement is hereby amended and restated as follows: (a) (i) for the period from and including September 30, 1999 through and including March 15, 2000, (A) with respect to the unpaid principal amount of Eurodollar Advances and Alternate Currency Advances, 3.50%, and (B) with respect to the unpaid principal amount of ABR Advances, 2.25%, and (ii) thereafter, at all times during the applicable periods set forth below and based on the most recently delivered Compliance Certificate of the Borrower: (A) with respect to the unpaid principal amount of Eurodollar Advances and Alternate Currency Advances, the percentage set forth below under the heading "Eurodollar Margin" and adjacent to such period, and (B) with respect to the unpaid principal amount of ABR Advances, the percentage set forth below under the heading "ABR Margin" and adjacent to such period: Eurodollar ABR Period Margin Margin ------ ---------- ------ When the Leverage Ratio is greater than 4.40:1.00...... 3.50% 2.25% When the Leverage Ratio is less than or equal to 4.40:1.00 but greater than 4.00....................... 3.25% 2.00% When the Leverage Ratio is less than or equal to 4.00:1.00............................................. 3.00% 1.75% 4. Simultaneously with the delivery to the Administrative Agent of the Compliance Certificate for the fiscal quarter of the Borrower ended on September 30, 1999 and in no event later than November 15, 1999 (the "CC Delivery Date"), the Borrower shall pay to the Administrative Agent, for distribution to the Lenders, any additional interest, Commitment Fees and Letter of Credit Fees that accrued under the Revolving Credit Agreement and the Revolving Credit Notes during the period from and including September 30, 1999 to and including the CC Delivery Date, as a result of any increase in the Applicable Margin or Commitment Fee caused by the amendment to the definition of "Applicable Margin" effected 2 hereby, to the extent that any such accrued additional interest, Commitment Fees or Letter of Credit Fees would have been payable on any Interest Payment Date or other applicable payment date during such period. All such additional interest, Commitment Fees and Letter of Credit Fees that have accrued under the Revolving Credit Agreement and the Revolving Credit Notes on and after September 30, 1999 but that have not been paid on or before the CC Delivery Date, shall continue to be owed under the Revolving Credit Agreement and the Revolving Credit Notes, and shall be paid in accordance with the Revolving Credit Agreement on the next applicable Interest Payment Date or other applicable payment date. Section 3.1(a) of the Revolving Credit Agreement and the definition of "Applicable Margin" in Section 1.1 of the Revolving Credit Agreement, each as in effect immediately prior to September 30, 1999, shall continue to govern the calculation of interest, Commitment Fees and Letter of Credit Fees payable thereunder for periods prior to such date. 5. The Administrative Agent and the Required Lenders hereby consent to the Term Loan Waiver. 6. The Aggregate Revolving Credit Commitments are hereby permanently reduced to $700,000,000 and Exhibit A to the Credit Agreement is hereby amended and restated in the form of Exhibit A attached hereto. 7. Paragraphs 1--6 of this Amendment shall not become effective until the satisfaction of all of the following conditions precedent: (a) The Administrative Agent shall have received this Amendment, duly executed by a duly authorized officer or officers of the Borrower, the Guarantors, the Pledgors, the Administrative Agent and the Required Lenders. (b) Receipt by the Administrative Agent, for the account of each Lender that shall have executed and delivered this Amendment (without any reservation or condition) to the Administrative Agent before 5:00 p.m. (New York City time) on November 8, 1999, of a non-refundable fee in an amount equal to 0.250% of the Revolving Credit Commitment (as set forth on Exhibit A attached hereto) of such Lender. (c) The Limited Waiver and Third Amendment to Amended and Restated Term Loan Agreement, dated as of the date hereof and substantially in the form of Annex II hereto (the "Term Loan Waiver"), shall have become effective prior to or simultaneously herewith, and the Administrative Agent shall have received an executed copy thereof. (d) The Administrative Agent shall have received a certificate, dated the effective date of this Amendment, of the Secretary or Assistant Secretary of the Borrower (i) attaching a true and complete copy of the resolutions of its Board of Directors and of all documents evidencing other necessary corporate action (in form and substance satisfactory to the Administrative Agent) taken by it to authorize this Amendment and the transactions contemplated hereby, and (ii) setting forth the incumbency of its officer or officers (including therein the signature specimen of such officer or officers) who may sign this Amendment, any Loan Document or any other document, notice or certificate executed and delivered in connection with any Loan Document. (e) The Administrative Agent shall have received an opinion of general counsel of the Borrower, the Guarantors and the Pledgors, dated the effective date of this Amendment and addressed to the Administrative Agent, the Collateral Agent, the Documentation Agent, the Syndication Agent and the Lenders, in form and substance reasonably satisfactory to the Administrative Agent and the Syndication Agent. 8. Without limiting the generality of the provisions of Section 11.1 of the Revolving Credit Agreement, the waivers set forth in this Amendment shall be limited precisely as written and nothing in this Amendment shall be deemed to: (a) constitute a waiver of any Defaults or Events of Default arising in any other instance or a waiver of any other term, provision or condition of the Revolving Credit 3 Agreement or any other instrument or agreement referred to therein; or (b) prejudice any right or remedy that the Administrative Agent, the Collateral Agent, the Swing Line Lender, the Letter of Credit Issuer or any Lender may now have (except to the extent such right or remedy was based upon any existing defaults that will not exist after giving effect to this Amendment) or may have in the future under or in connection with the Revolving Credit Agreement or any other instrument or agreement referred to therein. 9. The Borrower hereby acknowledges and agrees that all costs, fees and expenses as described in Section 11.5 of the Revolving Credit Agreement incurred by the Administrative Agent, the Syndication Agent, the Co- Arrangers, and Special Counsel with respect to this Amendment and the documents and transactions contemplated hereby shall be for the account of the Borrower and shall be promptly paid by the Borrower following the submission of an invoice therefor. 10. On the date hereof, each Credit Party hereby (a) reaffirms and admits the validity and enforceability of the Loan Documents (as amended by this Amendment) and all of its obligations thereunder, (b) agrees and admits that it has no defenses to or offsets against any such obligation, and (c) represents and warrants that, after giving effect to the effectiveness of this Amendment, no Default or Event of Default has occurred and is continuing, and that each of the representations and warranties made by it in the Loan Documents (as amended by this Amendment) to which it is a party is true and correct with the same effect as though such representation and warranty had been made on the date hereof. 11. In all other respects, the Loan Documents shall remain in full force and effect, and no amendment in respect of any term or condition of any Loan Document contained herein shall be deemed to be an amendment in respect of any other term or condition contained in any Loan Document. Notwithstanding anything to the contrary contained herein, the terms, provisions and conditions of the Third Amendment and Waiver shall remain and continue in full force and effect; provided that, for the period from September 30, 1999 through and including March 15, 2000, the Waiver Conditions as defined in the Third Amendment and Waiver shall be deemed replaced in their entirety by the Waiver Conditions as defined in this Amendment, except that the references to "One-Time Charges" contained in Paragraphs 3 and 10 of the Third Amendment and Waiver shall continue to be as defined under the Third Amendment and Waiver prior to giving effect to this Amendment. 12. This Amendment may be executed in any number of counterparts all of which, taken together, shall constitute one Amendment. In making proof of this Amendment, it shall only be necessary to produce the counterpart executed and delivered by the party to be charged. 13. THIS AMENDMENT IS BEING EXECUTED AND DELIVERED IN, AND IS INTENDED TO BE PERFORMED IN, THE STATE OF NEW YORK AND SHALL BE CONSTRUED AND ENFORCEABLE IN ACCORDANCE WITH, AND BE GOVERNED BY, THE INTERNAL LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO PRINCIPLES OF CONFLICT OF LAWS. [Remainder of page intentionally left blank] 4 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT AS EVIDENCE of the agreement by the parties hereto to the terms and conditions herein contained, each such party has caused this Amendment to be executed on its behalf. TOTAL RENAL CARE HOLDINGS, INC. By: _________________________________ Name: _______________________________ Title: ______________________________ 5 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT THE BANK OF NEW YORK, Individually, as the Letter of Credit Issuer, as the Swing Line Lender and as Administrative Agent By: _________________________________ Name: _______________________________ Title: ______________________________ 6 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT DLJ CAPITAL FUNDING, INC., Individually and as Syndication Agent By: _________________________________ Name: _______________________________ Title: ______________________________ 7 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT FIRST UNION NATIONAL BANK, Individually and as Documentation Agent By: _________________________________ Name: _______________________________ Title: ______________________________ 8 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT ABN AMRO BANK N.V. By: _________________________________ Name: _______________________________ Title: ______________________________ By: _________________________________ Name: _______________________________ Title: ______________________________ 9 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT ALLIED IRISH BANKS, P.L.C., CAYMAN ISLANDS BRANCH By: _________________________________ Name: _______________________________ Title: ______________________________ By: _________________________________ Name: _______________________________ Title: ______________________________ 10 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT BANCO ESPIRITO SANTO E COMERCIAL DE LISBOA, NASSAU BRANCH By: _________________________________ Name: _______________________________ Title: ______________________________ By: _________________________________ Name: _______________________________ Title: ______________________________ 11 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT BANK LEUMI TRUST COMPANY OF NEW YORK By: _________________________________ Name: _______________________________ Title: ______________________________ By: _________________________________ Name: _______________________________ Title: ______________________________ 12 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT THE BANK OF NOVA SCOTIA By: _________________________________ Name: _______________________________ Title: ______________________________ 13 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT BANQUE NATIONALE DE PARIS By: _________________________________ Name: _______________________________ Title: ______________________________ By: _________________________________ Name: _______________________________ Title: ______________________________ 14 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT BHF (USA) CAPITAL CORPORATION By: _________________________________ Name: _______________________________ Title: ______________________________ By: _________________________________ Name: _______________________________ Title: ______________________________ 15 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT CITY NATIONAL BANK By: _________________________________ Name: _______________________________ Title: ______________________________ 16 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT BANK OF AUSTRIA CREDITANSTALT CORPORATE FINANCE, INC. By: _________________________________ Name: _______________________________ Title: ______________________________ By: _________________________________ Name: _______________________________ Title: ______________________________ 17 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT CREDIT LYONNAIS NEW YORK BRANCH By: _________________________________ Name: _______________________________ Title: ______________________________ 18 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT DEUTSCHE BANK AG, NEW YORK AND/OR CAYMAN ISLANDS BRANCHES By: _________________________________ Name: _______________________________ Title: ______________________________ By: _________________________________ Name: _______________________________ Title: ______________________________ 19 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT DRESDNER BANK AG, NEW YORK BRANCH AND GRAND CAYMAN BRANCH By: _________________________________ Name: _______________________________ Title: ______________________________ By: _________________________________ Name: _______________________________ Title: ______________________________ 20 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT ERSTE BANK DER OESTERREICHISCHEN SPARKASSEN AG--NEW YORK By: _________________________________ Name: _______________________________ Title: ______________________________ By: _________________________________ Name: _______________________________ Title: ______________________________ 21 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT FLEET NATIONAL BANK By: _________________________________ Name: _______________________________ Title: ______________________________ 22 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT THE FUJI BANK, LIMITED By: _________________________________ Name: _______________________________ Title: ______________________________ 23 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT HIBERNIA NATIONAL BANK By: _________________________________ Name: _______________________________ Title: ______________________________ 24 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT THE INDUSTRIAL BANK OF JAPAN, LTD., LOS ANGELES AGENCY By: _________________________________ Name: _______________________________ Title: ______________________________ 25 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT KBC BANK By: _________________________________ Name: _______________________________ Title: ______________________________ By: _________________________________ Name: _______________________________ Title: ______________________________ 26 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT GENERAL ELECTRIC CAPITAL CORPORATION By: _________________________________ Name: _______________________________ Title: ______________________________ 27 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT MELLON BANK, N.A. By: _________________________________ Name: _______________________________ Title: ______________________________ 28 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT MICHIGAN NATIONAL BANK By: _________________________________ Name: _______________________________ Title: ______________________________ 29 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT THE MITSUBISHI TRUST AND BANKING CORPORATION By: _________________________________ Name: _______________________________ Title: ______________________________ 30 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT NATIONAL CITY BANK OF KENTUCKY By: _________________________________ Name: _______________________________ Title: ______________________________ 31 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT PARIBAS By: _________________________________ Name: _______________________________ Title: ______________________________ By: _________________________________ Name: _______________________________ Title: ______________________________ 32 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT COOPERATIEVE CENTRALE RAIFFEISEN-- BOERENLEENBANK B.A, "RABOBANK NEDERLAND", NEW YORK BRANCH By: _________________________________ Name: _______________________________ Title: ______________________________ By: _________________________________ Name: _______________________________ Title: ______________________________ 33 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT ROYAL BANK OF CANADA By: _________________________________ Name: _______________________________ Title: ______________________________ 34 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT THE ROYAL BANK OF SCOTLAND PLC By: _________________________________ Name: _______________________________ Title: ______________________________ 35 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT ROYALTON COMPANY By: Pacific Investment Management company, as its Investment Advisor By: _________________________________ Name: _______________________________ Title: ______________________________ 36 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT THE SANWA BANK, LIMITED By: _________________________________ Name: _______________________________ Title: ______________________________ 37 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT SOCIETE GENERALE By: _________________________________ Name: _______________________________ Title: ______________________________ 38 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT STB DELAWARE FUNDING TRUST I By: _________________________________ Name: _______________________________ Title: ______________________________ 39 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT SUNTRUST BANK, NASHVILLE, N.A. By: _________________________________ Name: _______________________________ Title: ______________________________ 40 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT THE TOKAI BANK, LIMITED By: _________________________________ Name: _______________________________ Title: ______________________________ 41 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT THE TOYO TRUST & BANKING CO., LTD., New York Branch By: _________________________________ Name: _______________________________ Title: ______________________________ 42 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT UNION BANK OF CALIFORNIA, N.A. By: _________________________________ Name: _______________________________ Title: ______________________________ 43 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT U.S. BANK NATIONAL ASSOCIATION By: _________________________________ Name: _______________________________ Title: ______________________________ 44 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT AGREED AND CONSENTED TO: TOTAL RENAL CARE, INC. TOTAL RENAL CARE ACQUISITION CORP. RENAL TREATMENT CENTERS, INC. RENAL TREATMENT CENTERS-MID-ATLANTIC, INC. RENAL TREATMENT CENTERS-NORTHEAST, INC. RENAL TREATMENT CENTERS-CALIFORNIA, INC. RENAL TREATMENT CENTERS-WEST, INC. RENAL TREATMENT CENTERS-SOUTHEAST, INC. Each by: _______________________________ Name: __________________________________ Title: _________________________________ TRC WEST, INC. By: ____________________________________ Name: __________________________________ Title: _________________________________ 45 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT ANNEX I LIST OF PERMITTED ACQUISITIONS--PUT OBLIGATIONS 46 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT ANNEX II FORM OF TERM LOAN WAIVER 47 AMENDMENT NO. 4 AND WAIVER TO AND UNDER AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT TRCH EXHIBIT A LIST OF COMMITMENTS 48