Dames & Moore, Inc.



                               Third Amendment



                        Dated as of December 16, 1996


                                      To


                           Note Purchase Agreements



                          Dated as of March 15, 1996



            Re:  $40,000,000 6.54% Senior Notes, Series A,
                           Due March 29, 2001,
                 $30,000,000 6.87% Senior Notes, Series B,
                           Due March 29, 2003,
                 $10,000,000 6.92% Senior Notes, Series C,
                           Due September 29, 2003,
                 $5,000,000 7.20% Senior Notes, Series D,
                           Due March 29, 2006
                                 and
                 $15,000,000 7.25% Senior Notes, Series E,
                           Due September 29, 2006



                                

                   THIRD AMENDMENT TO NOTE PURCHASE AGREEMENTS

     THIS THIRD AMENDMENT to Note Purchase Agreements dated as of December 16,
1996 (this "Third Amendment"), is entered into between Dames & Moore, Inc., a
Delaware corporation (the "Company"), and Teachers Insurance and Annuity 
Association of America, Principal Mutual Life Insurance Company, American 
General Life Insurance Company, United of Omaha Life Insurance Company, 
American Republic Insurance Company, Aid Association for Lutherans, Provident
Mutual Life Insurance Company, and Indianapolis Life Insurance Company
(each a "Noteholder" and collectively, the "Noteholders").

                              RECITALS:

     A.   The Company and the Noteholders, together with Unicare Life & 
Health Insurance Company (as successor MML Pension Insurance Company), 
Massachusetts Mutual Life Insurance Company, The Canada Life Assurance 
Company, Canada Life Insurance Company of America, Canada Life Insurance 
Company of New York and Allstate Life Insurance Company (together with the 
Noteholders, the "Original Purchasers"), respectively, have heretofore
entered into separate Note Purchase Agreements, each dated as of March 15, 
1996 and the First Amendment to Note Purchase Agreements dated as of April 
15, 1996 and the Company and the Noteholders have heretofore entered into the
Second Amendment to Note Purchase Agreements dated as of November 18, 1996 
(collectively as amended, the "Note Purchase Agreements").

     B.   On or about November 18, 1996, the Company consummated the 
acquisition of approximately 3,700,000 shares of its common stock held by DM 
Investors, Inc., a Delaware corporation and wholly-owned Subsidiary of 
Hochtief AG, a corporation organized under the laws of Germany ("Hochtief"), 
upon the terms and conditions and all as contemplated by that certain Stock 
Purchase Agreement, dated as of November 5, 1996 among the Company, DM
Investors, Inc. and Hochtief (the "Stock Acquisition").

     C.   The consummation of the Stock Acquisition would have resulted in a 
violation of the terms of the Note Purchase Agreements and in consequence 
thereof, the Company requested the Noteholders to enter into a second 
amendment to the Note Purchase Agreements for the purpose of amending such of
the terms of the Note Purchase Agreements as would be necessary in order to 
permit the Stock Acquisition.

     D.   Pursuant to Section 17 of the Note Purchase Agreements, the Company
and the holders of at least 51% in principal of the Notes consented to the 
amendment of certain of the terms of the Note Purchase Agreements as set 
forth in the Second Amendment to Note Purchase Agreements dated as of 
November 18, 1996 (the "Second Amendment").

     E.   The Second Amendment did not accurately reflect the agreement of 
the Company and the Noteholders with respect to Section 10.5 of the Note 
Purchase Agreements.

     F.   The Company and the Noteholders now desire to amend, effective on 
the date on which the conditions specified in Section 3 hereof are satisfied,
certain of the terms of the Note Purchase Agreements amended by the Second 
Amendment in order to set forth correctly the agreement of the Company and 
the Noteholders.

     G.   Capitalized terms used herein shall have the respective meanings 
ascribed thereto in the Note Purchase Agreements unless herein defined or the
context shall otherwise require.

     H.   All requirements of law have been fully complied with and all other
acts and things necessary to make this Third Amendment a valid, legal and 
binding instrument according to its terms for the purposes herein expressed 
have been done or performed.

     NOW, THEREFORE, the Company and the Noteholders, in consideration of good
and valuable consideration the receipt and sufficiency of which is hereby 
acknowledged, do hereby agree as follows:

SECTION 1.   AMENDMENT.

     Section 1.1.  Section 10.5(iv)(1) of the Note Purchase Agreements shall 
be and is hereby amended in its entirety to read as follows:
          
             "(1)   Consolidated Funded Debt shall not exceed the applicable 
     percentage of Consolidated Capitalization set forth below opposite the 
     period during which such additional Funded Debt is to be created, 
     issued, assumed, guaranteed or incurred:
                          
                                         Percent of Consolidated
             For the Period                   Capitalization
                                
       From September 27, 1996 to 
          and including March 28, 1997               56%
                                
                                
       From March 29, 1997 to and 
          including September 26, 1997               55%
                                
                                
       From September 27, 1997 to and 
          including March 27, 1998                   54%
                                
       From March 28, 1998 to and 
          including Septembe 25, 1998                52%
                                                                
       From September 26, 1998 and thereafter        50%"
                                
SECTION 2.   REPRESENTATIONS AND WARRANTIES OF THE COMPANY.

     Section 2.1.  To induce the Noteholders to execute and deliver this Third
Amendment, the Company represents and warrants to the Noteholders (which 
representations shall survive the execution and delivery of this Third 
Amendment) that:

              (a)   this Third Amendment has been duly authorized, executed 
     and delivered by it and this Third Amendment constitutes the legal, 
     valid and binding obligation, contract and agreement of the Company 
     enforceable against it in accordance with its terms, except as 
     enforcement may be limited by bankruptcy, insolvency, reorganization, 
     moratorium or similar laws or equitable principles relating to or 
     limiting creditors' rights generally; and

              (b)   the Note Purchase Agreements, as amended by this Third 
     Amendment, constitute the legal, valid and binding obligations, 
     contracts and agreements of the Company enforceable against it in 
     accordance with their terms, except as enforcement may be limited by 
     bankruptcy, insolvency, reorganization, moratorium or similar laws or
     equitable principles relating to or limiting creditors' rights generally.

SECTION 3.   CONDITIONS TO EFFECTIVENESS OF THIRD AMENDMENT.

          This Third Amendment shall not become effective until, and shall 
become effective when, each and every one of the following conditions shall 
have been satisfied:

              (a)   executed counterparts of this Third Amendment, duly 
     executed by the Company and the Noteholders, shall have been delivered 
     to the Noteholders; and

              (b)   the representations and warranties of the Company set 
     forth in Section 2 hereof shall be true and correct on and with respect 
     to the date hereof.

SECTION 4.   MISCELLANEOUS.

     Section 4.1.  Except as modified and expressly amended by this Third 
Amendment, the Note Purchase Agreements are in all respects ratified, 
confirmed and approved and all of the terms, provisions and conditions 
thereof shall be and remain in full force and effect.

     Section 4.2.  Any and all notices, requests, certificates and other 
instruments executed and delivered after the execution and delivery of this 
Third Amendment may refer to the Note Purchase Agreements without making 
specific reference to this Third Amendment but nevertheless all such 
references shall include this Third Amendment unless the context otherwise
requires.

     Section 4.3.  This Third Amendment shall be governed by and construed in
accordance with the laws of the State of New York.

     Section 4.4.  This Third Amendment may be executed and delivered in any 
number of counterparts, each of such counterparts constituting an original, 
but all together only one Third Amendment.
          

     IN WITNESS WHEREOF, the Company and the Noteholders have caused this 
instrument to be executed, all as of the day and year first above written.
 
                                     Dames & Moore, Inc.


                                     By  Mark A. Snell  
                                         _______________________________
                                     Its Executive Vice President and 
                                           Chief Financial Officer

Accepted and Agreed to:

                                     Teachers Insurance and Annuity
                                        Association of America
 

                                      By  Gregory W. MacCordy 
                                          _______________________________
                                      Its Director - Private Placements
                                    
Accepted and Agreed to:


                                      Principal Mutual Life Insurance
                                        Company


                                      By  Sarah J. Pitts 
                                          _______________________________
                                      Its Counsel


                                      By  Frederick A. Bell
                                          ________________________________
                                      Its Second Vice President -  
                                          Securities Investment


Accepted and Agreed to:

                                     American General Life Insurance
                                       Company


                                     By  Julia P. Tucker
                                         ________________________________
                                     Its Investment Officer


Accepted and Agreed to:

                                    United of Omaha Life Insurance
                                      Company


                                    By  Curt Caldwell
                                        _________________________________
                                    Its First Vice President

Accepted and Agreed to:

                                    American Republic Insurance
                                      Company
   

                                    By  G.F. Sheldon
                                        _________________________________
                                    Its Senior Vice President, Investments

Accepted and Agreed to:


                                     Aid Association for Lutherans


                                     By  James Abitz
                                         ________________________________
                                     Its Vice President - Securities



                                     By  R. Jerry Scheel
                                         ________________________________
                                     Its Second Vice President - Securities


Accepted and Agreed to:
  
                                     Provident Mutual Life Insurance
                                       Company
   
                                     By  James D. Kestner
                                         ________________________________
                                     Its Vice President


Accepted and Agreed to:
  
                                     Indianapolis Life Insurance Company
   
                                     By  Gene E. Trueblood
                                         _________________________________
                                     Its Vice President, CIO and Treasurer