SERV TECH INC /TX/
SC 13G, 1995-12-11
MISCELLANEOUS REPAIR SERVICES
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549



                                  SCHEDULE 13G



                   Under the Securities Exchange Act of 1934

                            (Amendment No.        )*


                                SERV-TECH, INC.
                                (Name of Issuer)


                                  COMMON STOCK
                         (Title of Class of Securities)


                                   817539109
                                 (CUSIP Number)


Check the following box if a fee is being paid with this statement [  X  ].  (A
fee is not required only if the filing person:  (1) has a previous statement on
file reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7).

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).





                               Page 1 of 6 pages
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CUSIP No. 817539109                   13G                    Page  2  of  6



1.  NAME OF REPORTING PERSON
    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                    HEARTLAND ADVISORS, INC.

                    #39-1078128

2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                      (a)  [      ]
                                      (b)  [      ]

3.  SEC USE ONLY

4.  CITIZENSHIP OR PLACE OF ORGANIZATION

                    WISCONSIN, U.S.A.

      NUMBER OF             5.  SOLE VOTING POWER
       SHARES               110,500
    BENEFICIALLY 
      OWNED BY
        EACH                6.  SHARED VOTING POWER
     REPORTING              None
       PERSON            
        WITH
                            7.  SOLE DISPOSITIVE POWER
                            801,300


                            8.  SHARED DISPOSITIVE POWER
                            None


9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

801,300

10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*



11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

12.2%

12.  TYPE OF REPORTING PERSON*

              IA
<PAGE>   3

CUSIP No. 817539109                    13G                      Page  3  of  6



1.  NAME OF REPORTING PERSON
    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                   HEARTLAND GROUP, INC.

                   #39-1572323

2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                       (a)  [      ]
                                       (b)  [      ]

3.  SEC USE ONLY

4.  CITIZENSHIP OR PLACE OF ORGANIZATION

                   MARYLAND, U.S.A.

     NUMBER OF           5.  SOLE VOTING POWER
       SHARES 
    BENEFICIALLY         425,000
      OWNED BY           
        EACH             6.  SHARED VOTING POWER
     REPORTING           None
       PERSON            
        WITH             7.  SOLE DISPOSITIVE POWER
                         None

                         
                         8.  SHARED DISPOSITIVE POWER
                         None


9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

425,000

10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*



11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

6.5%

12.  TYPE OF REPORTING PERSON*

              IV
<PAGE>   4

CUSIP NUMBER 817539109                                   Page 4 Of 6 Pages

Item 1.
         (a) Name of Issuer:  Serv-Tech Inc.

         (b) Address of Issuer's Principal Executive Offices:
                               5200 Cedar Crest Blvd.
                               Houston,  TX   77087
    
Item 2.
         (a) Name of Person Filing:    Heartland Advisors, Inc.
                                       Heartland Group, Inc.

         (b) Address of Principal Business Office:
                     Heartland Advisors, Inc.
                     790 North Milwaukee Street
                     Milwaukee, WI  53202

                     Heartland Group, Inc.
                     790 North Milwaukee Street
                     Milwaukee, WI  53202

         (c) Citizenship:    Heartland Advisors is a Wisconsin corporation.
                             Heartland Group is a Maryland corporation.

         (d) Title of Class of Securities:  Common Stock

         (e) CUSIP Number:  817539109

Item 3. If this statement is filed pursuant to Rule 13d-1(b),
         or 13d-2(b), check whether the person filing is a: 

    (a)_____     Broker or Dealer registered under Section 15 of
                 the Act.

    (b)_____     Bank as defined in Section 3(a)(6) of
                 the Act.

    (c)_____     Insurance company as defined in Section 3(a)(19)
                        of the Act.
         
    (d)  X       Investment company registered under Section 8 of the
                 Investment Company Act of 1940 with respect to Heartland Group.
         
    (e)  X       Investment adviser registered under Section 203 of the
                 Investment Advisers Act of 1940 with respect to Heartland 
                 Advisors.

    (f)_____     Employee Benefit Plan, Pension Fund which is subject
                 to the provisions of the Employee Retirement Income Security 
                 Act of 1974 or Endowment Fund; see Sec 240.13d-1(b)(1)(ii)(F).
<PAGE>   5


    (g)_____     Parent Holding Company, in accordance with
                 Sec 240.13d-1(b)(ii)(G) (Note:  See Item 1).


    (h)_____     Group, in accordance with
                 Sec 240.13d-1(b)(1)(ii)(H).

Item 4. Ownership.

         (a) Amount beneficially owned:
             801,300 shares are beneficially owned within the meaning of Rule 
13d-3 of the Securities Exchange Act of 1934 by Heartland Advisors; 425,000 
shares of which are also beneficially owned by Heartland Group within the 
meaning of the Rule.

         (b) Percent of Class:
             12.2% by Heartland Advisors, of which 6.5% is also held by 
Heartland Group.

         (c) For information on voting and dispositive power with respect to
the above listed shares, see Items 5-8 of the Cover Pages.


Item 5. Ownership of Five Percent or Less of a Class.

        If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than 
five percent of the class of securities, check the following:[  ]


Item 6. Ownership of more than Five Percent on Behalf of Another
        Person.

        The shares of common stock are held in investment advisory accounts of
Heartland Advisors.  As a result, various persons have the right to receive or
the power to direct the receipt of dividends from, or the proceeds from the
sale of, the securities.  As reported herein, the interests of one such
account, Heartland Group, Inc., a series investment company for which Heartland
Advisors serves as investment advisor, relates to more than 5% of the class.


Item 7. Identification and Classification of the Subsidiary Which Acquired the
        Security Being Reported on By the Parent Holding Company.

        Not Applicable.

Item 8. Identification and Classification of Members of the Group.

        Not Applicable.

Item 9. Notice of Dissolution of Group.

        Not Applicable.
<PAGE>   6


Item 10.  Certification.

        By signing below, I certify that, to the best of my knowledge and
belief, the securities referred to above were acquired in the ordinary course
of business and were not acquired for the purpose of and do not have the effect
of changing or influencing the control of the issuer of such securities and
were not acquired in connection with or as a participant in any transaction
having such purposes or effect.

                                   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.

DATE:   December 8, 1995

                            HEARTLAND ADVISORS, INC.

                            By:    PATRICK J. RETZER
                                   Patrick J. Retzer
                                   Vice President/Treasurer


                            HEARTLAND GROUP, INC.

                            By:    PATRICK J. RETZER
                                   Patrick J. Retzer
                                   Vice President/Treasurer


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