TETRA TECH INC
SC 13D/A, 1998-02-18
ENGINEERING SERVICES
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                               Amendment No. 1 to

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934


                                Tetra Tech, Inc.
                                (Name of Issuer)


                    Common Stock ($0.01 par value per share)
                         (Title of Class of Securities)


                                   881-62G-103
                                 (CUSIP Number)


                                Daniel A. Whalen
                               5866 Ostrander Road
                                Oakland, CA 94618
                                  510-283-7700
- --------------------------------------------------------------------------------
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)


                                December 22, 1997
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box: | |

- --------------------------------------------------------------------------------
                                Page 1 of 6 Pages

<PAGE>


- --------------------------------------------------------------------------------
(1)  NAME OF REPORTING PERSON:  Daniel A. Whalen

     S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON:   468-5636-37

- --------------------------------------------------------------------------------
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP               (a)      | |
                                                                    (b)      | |
- --------------------------------------------------------------------------------
(3)  SEC USE ONLY


- --------------------------------------------------------------------------------
(4)  SOURCE OF FUNDS*
     OO

- --------------------------------------------------------------------------------
(5)  CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
     2(d) or 2(e)                                                            | |

- --------------------------------------------------------------------------------
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION

     United States

- --------------------------------------------------------------------------------
     NUMBER OF             (7)      SOLE VOTING POWER
      SHARES                                 None
                      ----------------------------------------------------------
   BENEFICIALLY            (8)      SHARED VOTING POWER
     OWNED BY                                3,639,795
                      ----------------------------------------------------------
       EACH                (9)      SOLE DISPOSITIVE POWER
    REPORTING                                None
                      ----------------------------------------------------------
      PERSON               (10)     SHARED DISPOSITIVE POWER
       WITH                                  3,639,795
- --------------------------------------------------------------------------------
(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      3,639,795

- --------------------------------------------------------------------------------
(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* | |


- --------------------------------------------------------------------------------
(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      16.3%

- --------------------------------------------------------------------------------
(14)  TYPE OF REPORTING PERSON*

      IN

- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>

       Item 1. Security and Issuer

       This Amendment No. 1 amends and supplements the statement on Schedule 13D
dated June 23, 1997 (the "Statement") and relates to the common stock, par value
$0.01  per  share  (the  "Common  Stock"),  of  Tetra  Tech,  Inc.,  a  Delaware
corporation (the "Issuer")  beneficially  owned by Daniel A. Whalen. The address
of  the  principal  executive  offices  of the  Issuer  is  670  North  Rosemead
Boulevard, Pasadena, California 91107.

       Included in this Statement  were the shares of Series A preferred  stock,
par value $0.01 per share (the "Preferred  Stock"),  of the Issuer  beneficially
owned by Daniel A.  Whalen.  Each  share of  Preferred  Stock was  automatically
converted  into one share of Common Stock upon the filing of an amendment to the
Certificate  of  Incorporation  of the  Issuer  that  increased  the  number  of
authorized  shares of Common Stock to an amount sufficient to convert all of the
then-outstanding  shares  of  Preferred  Stock  (the  "Amendment").  The  Issuer
obtained the  stockholder  approval  necessary  for the  Amendment and filed the
Amendment on October 28, 1997. The Issuer declared a  five-for-four  stock split
to its stockholders of record on November 14, 1997,  payable on December 1, 1997
(the  "Stock  Split").  The stock split was  accomplished  by paying a 25% stock
dividend.

       Item 2. Identity and Background

       (a)    Daniel A. Whalen (the "Reporting Person")

       (b)    Address: 5866 Ostrander Road, Oakland, California 94618

       (c)    President and Chief  Executive  Officer of Whalen & Company,  Inc.
              ("WhalenCo") and Whalen Service Corps Inc. ("Whalen  Service," and
              together  with  WhalenCo,  the "Whalen  Companies"),  with offices
              located  at 3675  Mt.  Diablo  Boulevard,  Suite  360,  Lafayette,
              California 94549. The Whalen Companies assist their clients in the
              acquisition of sites for wireless  telecommunications  facilities.
              The  Reporting  Person  is also the  Executive  Vice  President  -
              Telecommunications and a director of the Issuer.

       (d)    During  the last five  years,  the  Reporting  Person has not been
              convicted in a criminal  proceeding  (excluding traffic violations
              or similar misdemeanors).

       (e)    During the last five years,  the  Reporting  Person has not been a
              party to a civil proceeding of a judicial or  administrative  body
              of competent  jurisdiction  and as a result of such proceeding was
              or is  subject  to a  judgment,  decree or final  order  enjoining
              future  violations  of,  or  prohibiting  activities  subject  to,
              federal or state securities laws.

       (f)    United States


<PAGE>

       Item 3. Source and Amount of Funds or Other Consideration

       (a)    Pursuant to the  Agreement  and Plan of  Reorganization  among the
              Issuer,  the Whalen Companies,  and the stockholders of the Whalen
              Companies  dated  June 11,  1997  (the  "Agreement"),  the  Whalen
              Companies  were merged with and into the Issuer.  The stock of the
              Whalen  Companies was converted into a right to receive  1,680,000
              shares of Common Stock,  1,231,840  shares of Preferred  Stock and
              other  good and  valuable  consideration.  Upon the  filing of the
              Amendment,  each share of Preferred  Stock was converted  into one
              share of Common Stock.

       (b)    Pursuant to the  Agreement,  the size of the board of directors of
              the Issuer was  increased to five members and Daniel A. Whalen was
              elected as a director.

       (c)    On June 11, 1997,  the  Reporting  Person  contributed  all of the
              shares  of Common  Stock and  Preferred  Stock  then  owned by the
              Reporting  Person to the Whalen Family Trust, a revocable trust in
              which the Reporting  Person serves as co-trustee  (the  "Revocable
              Trust").

       (d)    Pursuant to the  Amendment,  1,231,840  shares of Preferred  Stock
              beneficially  owned by the  Reporting  Person  were  automatically
              converted into 1,231,840 shares of Common Stock.

       (e)    Pursuant to the Stock Split,  727,960  shares of Common Stock were
              issued to the Revocable  Trust and six trusts  established for the
              benefit of the Reporting  Person's children (the "Family Trusts").
              The Reporting Person is a co-trustee of each of the Family Trusts.

       (f)    On December 22, 1997,  the  Revocable  Trust  transferred  500,000
              shares of Common  Stock to the Whalen  1997  Charitable  Remainder
              Unitrust established for estate planning purposes (the "CRT"). The
              Reporting Person serves as a co-trustee of the CRT.

       (g)    Beneficial  ownership  of  3,003,307  shares  of  Common  Stock is
              derived from the Reporting  Person's position as co-trustee of the
              Revocable  Trust.  The Revocable  Trust owns  3,003,307  shares of
              Common Stock.

       (h)    Beneficial  ownership of 136,488 shares of Common Stock is derived
              from the Reporting  Person's  position as co-trustee of the Family
              Trusts. Each trust owns 22,748 shares of Common Stock.

       (i)    Beneficial  ownership of 500,000 shares of Common Stock is derived
              from the Reporting Person's position as co-trustee of the CRT. The
              CRT owns 500,000 shares of Common Stock.


<PAGE>

       Item 4. Purpose of Transaction

       The information set forth in the response to Item 3 above is incorporated
herein by reference.

       Item 5. Interest in Securities of the Issuer

       The response to Item 3 is incorporated  herein by reference.  Pursuant to
Rule 13d-3 of the  Securities  Exchange Act of 1934,  as amended,  the Reporting
Person is deemed to  beneficially  own  3,639,795  shares of Common  Stock which
constitutes  approximately  16.3%  of the  22,301,912  shares  of  Common  Stock
outstanding.  The number of shares of Common Stock  outstanding  is based on the
Issuer's Form 10-Q filed on February 10, 1998.

       Item 6. Contracts,  Arrangements,  Understandings  or Relationships  with
Respect to Securities of the Issuer

       The  information  set  forth in the  responses  to Items 3 and 4 above is
incorporated herein by reference.

       Item 7. Material to be filed as Exhibits

       Not applicable



                  {remainder of page intentionally left blank}


<PAGE>



                                    SIGNATURE

       After  reasonable  inquiry and to the best of my knowledge and belief,  I
certify that the information  set forth in this Statement is true,  complete and
correct.

Dated: February 17, 1998



                                DANIEL A. WHALEN


                              /s/ Daniel A. Whalen




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