1 EXHIBIT 99 SIXTH MODIFICATION OF CREDIT AGREEMENT THIS SIXTH MODIFICATION OF CREDIT AGREEMENT (the "Modification") is entered into as of the 30th day of November, 1996 by and between DYCOM INDUSTRIES INC., a Florida corporation ("Borrower") and FIRST UNION NATIONAL BANK OF FLORIDA, a National Banking Association ("Lender"). W I T N E S S E T H: WHEREAS, Borrower and Lender entered into a certain Credit Agreement dated as of April 28, 1993, which was amended by First Modification dated December 13, 1993 and by Second Modification dated April 7, 1994 and by Third Modification dated November 30, 1994, and by Fourth Modification dated July 31, 1995, and by Fifth Modification dated November 30, 1995 (as amended, the "Credit Agreement"); and WHEREAS, Borrower has requested that Lender amend the Credit Agreement to (i) extend and modify the Standby Letter of Credit Facility referenced in Section 4; and (ii) extend and modify the Equipment Acquisition Facility referenced in Section 5; WHEREAS, Lender is willing to amend the Credit Agreement as more particularly set forth herein. NOW THEREFORE, for good and valuable considerations, the receipt of which is hereby acknowledged, the parties do hereby modify the Credit Agreement, as follows: 1. Standby Letter of Credit Facility. The expiration date of the Standby Letter of Credit Facility referenced in Section 4 of the Credit Agreement is hereby extended to February 28, 1997. Accordingly, Section 4.01 of the Credit Agreement as previously modified is modified by inserting therein the date "February 28, 1997." Sections 4.02 and 4.06 of the Credit Agreement as previously modified are amended by inserting therein the date of "February 28, 1997." 2 2. Equipment Acquisition Facility. (a) Expiration. The expiration date of the Equipment Acquisition Facility referenced in Section 5 of the Credit Agreement as previously modified is hereby extended to February 28, 1997. Accordingly, paragraph 5.01 of the Credit Agreement as previously modified is amended to insert the date "February 28, 1997." (b) Term. The maximum term of any Equipment Acquisition Advance is four years or February 28, 2001, whichever occurs first. The principal of each Equipment Acquisition Advance shall be payable in equal quarterly installments with the Borrower selecting a term of either one, two, three or four years from the date of the Advance, provided that in any event the final quarterly payment cannot be due later than February 28, 2001. Accrued interest shall be payable quarterly as specified in Section 5 of the Credit Agreement. 3. Except as expressly modified herein, the Credit Agreement as previously amended is hereby reaffirmed in its entirety. DYCOM INDUSTRIES INC. By: /s/ Thomas R. Pledger _________________________________ Its: Chairman and CEO Agreed: FIRST UNION NATIONAL BANK OF FLORIDA By: /s/ Robert D. Bridges __________________________________ Its: Sr. Vice President 3 CONSENT BY GUARANTORS THIS CONSENT BY GUARANTORS is executed as of the 30th day of November, 1996 by the following corporations: a. Advance Leasing of Guilford, Inc., a Florida corporation b. Ansco & Associates, Inc., a Florida corporation c. Coastal Plains, Inc., a Georgia corporation d. Fiber Cable, Inc., a Delaware corporation e. Globe Communications, Inc., a North Carolina corporation f. Ivy H. Smith Company, a Florida corporation g. Kohler Construction Company, Inc., a Florida corporation h. Prime Utility Contractors, Inc., an Alabama corporation i. Signal Construction Company, Inc., a Florida corporation j. Southeastern Electric Construction, Inc., a Florida corporation k. Star Construction, Inc., a Tennessee corporation l. S.T.S., Inc., a Florida corporation m. TESINC, Inc., an Arizona corporation (collectively the "Guarantors"), in favor of FIRST UNION NATIONAL BANK OF FLORIDA (the "Lender"). W I T N E S S E T H: WHEREAS, as of April 28, 1993, the Guarantors executed Guaranty Agreements in favor of Lender pertaining to the Credit Agreement and the Loan Documents referenced therein executed by Dycom Industries Inc., a Florida corporation ("Borrower") and Lender; and WHEREAS, the Credit Agreement was modified by First Amendment dated December 13, 1993, Second Amendment dated April 7, 1994, Third Amendment dated November 30, l994, Fourth Modification dated July 31, 1995, and Fifth Amendment dated November 30, 1995; and WHEREAS, Borrower has requested that Lender execute and deliver a Sixth Modification of Credit Agreement; and WHEREAS, as a pre-condition to executing the Sixth Modification of Credit Agreement, Lender has required that the Guarantors consent to the Sixth Modification of Credit Agreement; and 4 WHEREAS, it is to the benefit of Guarantors that Lender consent and execute the Sixth Modification of Credit Agreement. NOW THEREFORE, for good and valuable considerations, the receipt of which is hereby acknowledged, the Guarantors hereby agree as follows: 1. The Guarantors do hereby consent and agree to the terms and conditions of the Sixth Modification of Credit Agreement, a copy of which is attached hereto as Exhibit "A" and incorporated by reference herein. Guarantors agree that the Guaranty Agreements previously executed by Guarantors shall remain in full force and effect and shall apply to all advances under the Sixth Modification of Credit Agreement. 2. Guarantors do hereby reaffirm in full their respective Guaranties. IN WITNESS WHEREOF, this document has been duly executed as of the day and year first set forth above. Advance Leasing of Guilford, Inc. By: /s/ Thomas R. Pleder _______________________________ Its:Vice President Ansco & Associates, Inc. By: /s/ Thomas R. Pleder _______________________________ Its:Vice President Coastal Plains, Inc. By: /s/ Thomas R. Pleder _______________________________ Its:Vice President Fiber Cable, Inc. By: /s/ Thomas R. Pleder _______________________________ Its:Vice President 5 Globe Communications, Inc. By: /s/ Thomas R. Pleder _______________________________ Its:Vice President Ivy H. Smith Company By: /s/ Thomas R. Pleder _______________________________ Its:Vice President Kohler Construction Company, Inc. By: /s/ Thomas R. Pleder _______________________________ Its:Vice President Prime Utility Contractors, Inc. By: /s/ Thomas R. Pleder _______________________________ Its:Vice President Signal Construction Company, Inc. By: /s/ Thomas R. Pleder _______________________________ Its:Vice President Southeastern Electric Construction, Inc. By: /s/ Thomas R. Pleder _______________________________ Its:Vice President Star Construction, Inc. By: /s/ Thomas R. Pleder _______________________________ Its:Vice President 6 S.T.S., Inc. By: /s/ Thomas R. Pleder _______________________________ Its:Vice President TESINC, Inc. By: /s/ Thomas R. Pleder _______________________________ Its:Vice President