Document:

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                                                                   EXHIBIT 10.58
                            SECURED PROMISSORY NOTE
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November 2, 1999                                                      $77,999.22

          Carol A. Boudreau ("Maker"), hereby promises to pay to the order of
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ZEFER Corp. (the "Company"), the principal amount of $77,999.22, or so much
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thereof that may be outstanding from time to time that is advanced ("Advances")
by the Company to the Maker to enable the Maker to purchase shares of the
Company's Class A Preferred Stock, par value $.01 per share (the "Class A
Preferred"), together with interest thereon calculated from the date hereof in
accordance with the provisions of this Note.

          Capitalized terms used herein and not otherwise defined shall have the
meanings given to them in that Senior Management Agreement, dated as of March
23, 1999, between the Company and William A. Seibel (the "Management
                                                          ----------
Agreement").
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     1.   Interest.  Interest shall accrue on the outstanding principal amount
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of this Note at a rate equal to 10% per annum, compounded annually on each
anniversary of the date hereof.

     2.   Payment on Note.
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          (a) Term.  Subject to Section 2(b) below, the entire principal amount
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of this Note and all accrued interest thereon shall be due and payable on June
1, 2000.

          (b) Mandatory Prepayments.  Notwithstanding anything in Section 2(a)
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to the contrary, in the event Maker receives any net cash proceeds relating to
any transaction or series of transactions in which Maker sells any of the
Secured Shares (as defined in Section 8 below), Maker shall prepay any amounts
owed pursuant to this Note by applying all of such proceeds first, to any
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accrued interest and second, to any principal then outstanding.  Upon a Sale of
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the Company, Maker shall pay the entire principal amount then outstanding and
any accrued interest to the Company.  For purposes hereof, a "Sale of the
                                                              -----------
Company" shall have the meaning set forth in the Management Agreement.
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          (c) Optional Prepayments.  Maker may, at any time and from time to
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time without premium or penalty, prepay all of the outstanding principal amount
of the Note; provided that any prepayment will be accompanied by a payment of
accrued interest on the portion being prepaid.

          (d) Right of Offset.  Upon an Event of Default (as described in
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Section 3 hereof), the Company shall be entitled to offset any amounts owed to
the Company by the Maker, now existing or hereinafter arising, pursuant to this
Note against any amounts payable by the Company to the Maker pursuant to and as
set forth in the Management Agreement between the Company and William A. Seibel.
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     3.   Events of Default.
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          (a) Definition.  For purposes of this Note, an Event of Default shall
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be deemed to have occurred if:

              (i)   Maker fails to pay (A) within 30 days after the date when
     due, the full amount of interest then accrued or (B) when due, the fall
     amount of any principal payment; or

              (ii)  Maker makes an assignment for the benefit of creditors or
     admits in writing her inability to pay her debts generally as they become
     due; or an order, judgment or decree is entered adjudicating Maker bankrupt
     or insolvent; or any order for relief with respect to Maker is entered
     under the Federal Bankruptcy Code; or Maker petitions or applies to any
     tribunal for the appointment of a custodian, trustee, receiver or
     liquidator of any substantial part of Maker's assets, or commences any
     proceeding relating to Maker under any bankruptcy, reorganization,
     arrangement, insolvency, readjustment of debt, dissolution or liquidation
     law of any jurisdiction; or any such petition or application is filed, or
     any such proceeding is commenced, against Maker and either (A) Maker by any
     act indicates its approval thereof, consent thereto or acquiescence therein
     or (B) such petition, application or proceeding is not dismissed within 60
     days.

          (b) Consequences of Events of Default.
              ---------------------------------

          If an Event of Default of the type described in subparagraph 3(a)(ii)
has occurred the aggregate principal amount of the Note (together with all
accrued interest thereon and all other amounts payable in connection therewith)
shall become immediately due and payable without any action on the part of the
Company, and Maker shall immediately pay to the Company all amounts due and
payable with respect to the Note.

          If an Event of Default of the type described in subparagraph 3(a)(i)
has occurred and continued for 5 days, the Company may declare all or any
portion of the outstanding principal amount of the Note (together with all
accrued interest thereon and all other amounts due in connection therewith) due
and payable and demand immediate payment of all or any portion of the
outstanding principal amount of the Note.

          Maker, or her successors and assigns, hereby waives diligence,
presentment, protest and demand and notice of protest and demand, dishonor and
nonpayment of this Note, and expressly agrees that this Note, or any payment
hereunder, may be extended from time to time and that the Company may accept
security for this Note or release security for this Note, all without in any way
affecting the liability of Maker hereunder.

          In the event that Maker fails to pay any amounts due hereunder when
due, Maker shall pay to the Company, in addition to such amounts due, all costs
of collection, including reasonable attorneys fees.
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     4.   Amendment and Waiver.  Except as otherwise expressly provided herein,
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the provisions of the Note may be amended and Maker may take any action herein
prohibited, or omit to perform any act herein required to be performed by it,
only if Maker has obtained the written consent of the Company.

     5.   Cancellation.  After all principal and accrued interest at any time
          ------------
owed on this Note has been paid in full, this Note shall be surrendered to Maker
for cancellation and shall not be reissued.

     6.   Place of Payment.  Payments of principal and interest are to be
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delivered to the Company at the following address:

                    ZEFER Corp.
                    711 Atlantic Avenue
                    Boston, MA 02111
                    Attention: Chief Financial Officer

or to such other address or to the attention of such other person as specified
by prior written notice to Maker.

     7.   Usury Laws.  It is the intention of the Company and Maker to conform
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strictly to all applicable usury laws now or hereafter in force, and any
interest payable under this Note shall be subject to reduction to the amount not
in excess of the maximum legal amount allowed under the applicable usury laws as
now or hereafter construed by the courts having jurisdiction over such matters.
If the maturity of this Note is accelerated by reason of an election by the
Company resulting from an Event of Default, voluntary prepayment by Maker or
otherwise, then earned interest may never include more than the maximum amount
permitted by law, computed from the date hereof until payment, and any interest
in excess of the maximum amount permitted by law shall be canceled automatically
and, if theretofore paid, shall at the option of the Company either be rebated
to Maker or credited on the principal amount of this Note, or if this Note has
been paid, then the excess shall be rebated to Maker.  The aggregate of all
interest (whether designated as interest, service charges, points or otherwise)
contracted for, chargeable, or receivable under this Note shall under no
circumstances exceed the maximum legal rate upon the unpaid principal balance of
this Note remaining unpaid from time to time.  If such interest does exceed the
maximum legal rate, it shall be deemed a mistake and such excess shall be
canceled automatically and, if theretofore paid, rebated to Maker or credited on
the principal amount of this Note, or if this Note has been repaid, then such
excess shall be rebated to Maker.

     8.   Security Interest.  Maker, as security for payment of this Note,
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hereby grants a first priority security interest in and assigns and pledges to
the Company, together with any and all dividends, distributions or other
proceeds thereof, all shares of Class A Preferred purchased by Maker by means of
Advances (the "Secured Shares"). The undersigned has delivered to the Company
the certificate or certificates representing the Secured Shares and an undated
stock power, executed in blank.  The undersigned agrees to cause all non-cash
dividends and distributions with respect to the Secured Shares to be distributed
directly to the Company and to be held by the Company as part of the Secured
Shares.  The undersigned acknowledges and
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understands that the Company's only duty with respect to the Secured Shares is
to exercise reasonable care to secure the safe custody of the Secured Shares.

     9.   Governing Law.  This Note is made under and governed by the internal
          -------------
law, not the laws of conflicts, of the State of Delaware.

     IN WITNESS WHEREOF, Maker has executed and delivered this Note as an
instrument under seal as of the date first above written.

                                        /s/ Carol A. Boudreau
                                        ---------------------
                                        Carol A. Boudreau - Maker

                                   GUARANTEE

     I, William A. Seibel, absolutely and unconditionally guarantee the full and
punctual payment of all obligations of the Maker under this Note, including all
costs of collection, compromise or enforcement incurred with respect to such
obligations (collectively, the "Obligations").  I acknowledge that this is a
continuing guarantee which shall apply to all Obligations, whether or not notice
of such Obligations is given to me and notwithstanding my death or incapacity.
I also acknowledge that this guarantee is irrevocable and shall continue without
limit of time.

                                        /s/ William A. Seibel
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                                        William A. Seibel<PAGE>

                                                                   EXHIBIT 10.59

            FORM OF AMENDMENT TO RESTRICTED STOCK VESTING SCHEDULE

                           [ZEFER CORP. LETTERHEAD]

     April __, 2000

[NAME OF PARTY]
[ADDRESS OF PARTY]

     Re:  Amendment to [TYPE OF AGREEMENT]

Dear [NAME OF PARTY]:

     This letter agreement amends that certain [INSERT THE TYPE OF AGREEMENT TO
BE AMENDED] (the "Agreement") dated as of [DATE OF THE RELEVANT AGREEMENT WITH
THE PARTY] between you, ZEFER Corp. (the "Company"), GTCR Fund VI, L.P., GTCR
Executive Fund VI, L.P., and GTCR Associates Fund VI, L.P. (collectively, the
"GTCR Affiliates").

     Section 2 of the Agreement is hereby amended as follows:

1.   Amendment to Section 2(a).   Section 2(a) of the agreement is hereby
     -------------------------
     amended and modified by replacing the second sentence thereof with the
     following"

     "Except as otherwise provided in Sections 2(b), 2(c) and 2(d) below, the
     Executive Stock will become vested in accordance with the following
     schedule (the "Vesting Schedule"), if as of each such date Executive is
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     still employed by the Company or any of its Subsidiaries.

2.   Amendment to Section 2(d).   Section of the Agreement is hereby amended and
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     modified by adding the following subsection:

     "Notwithstanding Sections 2(b) and 2(c) above, in the event that the
     Company terminates the Executive's employment with the Company and its
     subsidiaries without Cause or in the event the Executive resigns his
     position with the Company and its Subsidiaries for Good Reason (i) on or
     before the first anniversary of the commencement of such employment, the
     Executive Stock that would have otherwise vested within the 18 months
     following the date of such termination shall vest immediately; and (ii)
     after the first anniversary of the commencement of such employment, the
     Executive Stock that would have otherwise vested within the 12 months
     following the date of such termination shall vest immediately."
<PAGE>

3.   General.  Except as specifically modified and amended hereby, the Agreement
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     remains in full force and effect and is hereby ratified, confirmed and
     approved in all respects. This Letter Agreement reflects the complete
     agreement and understanding among the parties and supersedes and preempts
     any prior understandings, agreements or representations by or among the
     parties, written or oral, which may have related to the subject matter
     hereof in any way. This Letter Agreement may be executed in separate
     counterparts, each of which is deemed to be an original and all of which
     taken together constitute one and the same agreement. The laws of Delaware
     shall govern all issues concerning the relative rights of the Company and
     its stockholders and all other questions concerning the construction,
     validity and interpretation of this Letter Agreement, without giving effect
     to any choice of law or other conflict of law provision or rule (whether of
     the State of Delaware or any other jurisdiction) that would cause the
     application of the laws of any jurisdiction other than the State of
     Delaware.

     IN WITNESS WHEREOF, the parties hereto have executed this [TYPE OF
AGREEMENT] on the date first written above.

                              ZEFER CORP.

                              By:
                                 --------------------------------------
                              Its:

                              -----------------------------------------
                              Executive

Agreed and Accepted:

GTCR FUND VI, L.P.

By:  GTCR Partners VI, L.P.
Its:   General Partner
By:  GTCR Golder Rauner, L.L.C.
Its:  General Partner

By:
      ---------------------------------

Name:
      ---------------------------------
Its:  Principal

GTCR VI EXECUTIVE FUND, L.P.
By:  GTCR Partners VI, L.P.
Its: General Partner
<PAGE>

By:  GTCR Golder Rauner, L.L.C.
Its: General Partner

By:
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Name:
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Its:  Principal

GTCR ASSOCIATES VI
By:  GTCR Partners VI, L.P.
Its: Managing General Partner

By:  GTCR Golder Rauner, L.L.C.
Its: General Partner

By:
      ----------------------------------

Name:
      ----------------------------------
Its:  Principal

     The foregoing Letter Agreement is to be entered into between ZEFER Corp.
and the following stockholders of ZEFER Corp. to modify the type of agreement,
and on a certain date set forth opposite such stockholders' name:

Amendments to Senior Management Agreements

     Gerard E. Dube,  April, 2000
     John Kelly,  April, 2000
     Sean W. Mullaney,  April, 2000
     James L. Slamp,  April, 2000
     Martha Stephens,  April, 2000
     Frank Torbey,  April, 2000
     Thomas Waite,  April, 2000

Amendment to Stock Restriction Agreement

     David Lubin,  April, 2000

Amendment to Employment Agreement

     Anthony K. Tjan,  April, 2000

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