Document:

<PAGE>
                                                                   Exhibit 10.23

                                 April 9, 2004

Kinetics Group, Inc.
2805 Mission College Boulevard
Santa Clara, California 95054
Attention: General Counsel

Re: Special Power of Attorney

Gentlemen:

Reference is made to that certain Amended and Restated Credit Agreement dated as
of December 10, 2002 (as amended, supplemented, amended and restated or
otherwise modified from time to time, the "CREDIT AGREEMENT") among Celerity
Group, Inc. (f/k/a Kinetics Holdings Corporation) ("HOLDINGS"), Kinetics Group,
Inc. (the "KGI"), the subsidiary guarantors party thereto, the lenders party
thereto from time to time, The Bank of Nova Scotia as Administrative Agent
("SENIOR LENDER AGENT") and the other lenders party thereto (collectively, the
"SENIOR LENDERS").

Reference is also made to that certain Amended and Restated Purchase Agreement
dated as of April 9, 2004 (as amended, supplemented, amended and restated or
otherwise modified from time to time, the "TCP PURCHASE AGREEMENT") by and among
Holdings, KGI, Kinetic Systems, Inc. ("KSI"), the Subsidiary Guarantors party
thereto, the Purchasers party thereto (the "TCP PURCHASERS") and Tennenbaum
Capital Partners, LLC, as Agent for such Purchasers (the "TCP AGENT").

Reference is also made to that certain Amended and Restated Securities Purchase
Agreement dated as of April 9, 2004 (as amended, supplemented, amended and
restated or otherwise modified from time to time, the "MEZZANINE PURCHASE
AGREEMENT"), by and among the Company, Holdings, KSI, the Subsidiary Guarantors
party thereto, the Purchasers party thereto (the "MEZZANINE PURCHASERS") and
Ares Corporate Opportunities Fund, L.P., as Agent for such Purchasers (the
"MEZZANINE AGENT").

The Credit Agreement, TCP Purchase Agreement, Mezzanine Purchase Agreement, the
Mezzanine Transaction Documents (as defined in the Mezzanine Purchase
Agreement), the Transaction Documents (as defined in the TCP Purchase
Agreement), and the Credit Documents (as defined in the Credit Agreement) shall
collectively be referred to as the "LOAN AGREEMENTS." Capitalized terms not
otherwise defined herein shall have the meanings ascribed thereto in the Loan
Agreements, as applicable. This letter agreement is being entered into for the
benefit of KGI, the Lenders and Holders under the Loan Agreements.

1.       Efforts to Avoid Defaults. The LLC hereby agrees to use its
         commercially reasonable efforts avoid the LLC causing a Default or
         Event of Default under each of the Loan Agreements in respect of its
         obligations and requirements thereunder.

2.       Appointment of Special Attorney-in-Fact. For purposes of performing the
         obligations of the LLC under each Loan Agreement, the LLC hereby
         irrevocably constitutes and appoints KGI

<PAGE>

         and any officer or agent thereof (the "ATTORNEY-IN-FACT"), with full
         power of substitution, as its true and lawful attorney-in-fact with
         full irrevocable power and authority in the place and stead of the LLC
         and in the name of the LLC or in its own name, upon the occurrence of a
         Default, and whether or not there then exists an Event of Default, for
         the purpose of taking all appropriate action that would be taken by a
         reasonably prudent person in such circumstances to cure such Default
         before such time that there is an Event Default and to cure any Event
         of Default, including, but not limited to, performing the obligations
         of the LLC under the terms of the Loan Agreements and perfecting and
         preserving the priority of security interests granted pursuant to the
         Pledge Agreement contemplated by the Loan Agreements. KGI hereby
         accepts such appointment and agrees, for the benefit of the Lenders and
         Holders under the Loan Agreements, to exercise the authority granted to
         it as Attorney-in-Fact.

3.       Celerity Merger. The Parties acknowledge that KGI is expected to be
         merged with and into Holdings, and it is agreed that in connection with
         such merger Holdings shall be substituted for KGI as a party to this
         letter.

4.       Specific Performance. The Parties hereby expressly agree that the
         Lenders and Holders under the Loan Agreements may enforce any and all
         rights derived herein by suit, either in equity or law, for specific
         performance of any agreement contained in this letter agreement or for
         judgment at law and any other relief whatsoever appropriate to such
         action or procedure.

5.       Governing Law. This letter agreement shall be construed in accordance
         with and governed by the laws of the State of New York, without regard
         to any conflicts of law provisions that would require the application
         of the law of any other jurisdiction.

6.       Counterparts. This letter agreement may be executed in any number of
         counterparts and by the different parties hereto on separate
         counterparts, each of which when so executed and delivered shall be an
         original, but all of which shall together constitute one and the same
         instrument.

7.       Termination. Upon the termination or satisfaction in full of the LLC's
         obligations under the Loan Agreements, this Agreement shall terminate.

8.       Headings Descriptive. The headings of the several sections and
         subsections of this letter agreement are inserted for convenience only
         and shall not in any way affect the meaning or construction of any
         provision of this Agreement.

9.       Amendment or Waiver; Etc. Neither this letter agreement nor any terms
         hereof may be changed, waived, discharged or terminated unless such
         change, waiver, discharge or termination is in writing signed by each
         of the investor Parties to the Restructuring Agreement, the Required
         Lenders under the Credit Agreement, the Required Holders under the TCP
         Purchase Agreement and the Required Holders under the Mezzanine
         Purchase Agreement.

                                       2
<PAGE>

10.      Third Party Beneficiaries. Each of the Lenders and Holders under the
         Loan Agreements is a third party beneficiary hereof, entitled to
         enforce the provisions of this agreement as if it were a party hereto.

                                    KH LLC, a Delaware limited liability company

                                    By: /s/ John M. Goodman
                                        ----------------------------------------
                                    Name: JOHN M. GOODMAN
                                    Title:

AGREED AND ACKNOWLEDGED:

KINETICS GROUP, INC.,
a Delaware corporation

By: /s/ John M. Goodman
    --------------------------
Name: JOHN M. GOODMAN
Its:

                [Signature Page-Special Power of Attorney Letter]<PAGE>
                                                                   Exhibit 10.24

                             REIMBURSEMENT AGREEMENT

         This Reimbursement Agreement ("Agreement") is entered into as of April
9, 2004 by and among Celerity Group, Inc., formerly Kinetics Holdings
Corporation, a Delaware corporation ("KHC"), Kinetics Group, Inc., a Delaware
Corporation ("KGI"), Celerity Group, Inc., a California corporation formerly
known as Kinetics Fluid Systems, Inc., ("KFS") and Kinetic Systems, Inc., a
California corporation ("KSI" and together with KHC, KGI and KFS, the "Kinetics
Entities") and KH LLC, a Delaware limited liability company ("KH LLC').

                                    RECITALS

         A. WHEREAS, KH LLC will perform services for and provide management
services for the Kinetics Entities (the "Services");

         B. WHEREAS, KH LLC will incur costs and expenses, including those of
its professional advisors, in performing the Services.

         NOW, THEREFORE, in consideration of the foregoing and the following
covenants and agreements and for good and valuable consideration the receipt and
adequacy of which are hereby acknowledged, the parties hereby agree as follows:

                  1. REIMBURSEMENT AND INTEREST, (a) Reimbursement of KH LLC by
Kinetics Entities. Each Kinetics Entity jointly and severally agrees to pay KH
LLC, or cause to be paid to KH LLC, a sum equal to the amount paid by KH LLC in
performing the Services, which payment shall become due and payable immediately
upon the demand of KH LLC. All amounts under this Section 1 shall be paid in
U.S. Dollars without set-off, claim or counterclaim in immediately available
funds. The obligations of Kinetics Entities hereunder to reimburse KH LLC shall
be absolute, irrevocable and unconditional and shall be performed strictly in
accordance with the terms hereof, irrespective of any lack of validity or
enforceability of the obligation of KH LLC or any other event or circumstance.

                  (b) Allocation of costs among Kinetics Entities. Costs
incurred by KH LLC shall be allocated as follows: (i) first to the Kinetics
Entity on whose behalf the costs were incurred and (ii) second in accordance
with the allocations set forth on Annex 1 hereto. The allocations specified
above shall not limit KH LLC's ability to obtain reimbursement of the full
amounts owed from any Kinetics Entity for the Services.

                  (c) Reimbursement of Kinetics Entity Making Payment. In the
event that a Kinetics Entity ("Paying Entity") makes payment of an obligation
that is allocated to another Kinetics Entity ("Owing Entity") pursuant to
Section l(b) above, the Owing Entity agrees to pay to the Paying Entity, or to
cause to be paid to such Paying Entity, a sum equal to each amount paid by such
Paying Entity in accordance with this Agreement, which payment shall become due
and payable immediately upon the earlier of (i) demand of such Paying Entity and
(ii) the date that is five (5) days after the payment by such Paying Entity. All
amounts under this Section l(c) shall be paid in U.S. Dollars without set-off,
claim or counterclaim in immediately available funds to such Paying Entity.

<PAGE>

                  (d) Maximum Reimbursement Amount. Reimbursement to pay
expenses of KH LLC (i) from the date hereof until a Qualifying Event shall not
to exceed $750,000 (exclusive of any fees or expenses associated with such
Qualifying Event that are not otherwise paid or payable by any Kinetics Entity)
and (ii) in each fiscal year following such Qualifying Event shall not to exceed
$400,000 in any such fiscal year (exclusive of any fees or expenses associated
with such Qualifying Event that are not otherwise paid or payable by any
Kinetics Entity); provided that if the Services exceed such limitations the
parties will discuss in good faith changing or modifying such limitations. A
Qualifying Event shall mean a public offering by KHC in which the aggregate
public offering price (before deduction of underwriters' discounts and
commissions) equals or exceeds one hundred million dollars ($100,000,000).

                  2. ENTIRE AGREEMENT. This Agreement contains the entire
agreement between the parties hereto with respect to the subject matter hereof
and supersedes all prior arrangements and understandings (whether written or
oral) with respect thereto. Amendment or modification of this Agreement shall
require the written agreement of the parties hereto.

                  3. COUNTERPARTS. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original but all of which
together shall constitute one and the same agreement.

                  4. NOTICES. All notices, consents, requests, instructions,
approvals and other communications provided for herein and all legal process in
regard hereto shall be validly given, made or served, if in writing and
delivered by personal delivery, overnight courier, telecopier or registered or
certified mail, return-receipt requested and postage prepaid addressed as
follows:

                  If to KGI to:

                  Kinetics Group, Inc.
                  2805 Mission College Boulevard
                  Santa Clara, California 95054
                  Attention: General Counsel
                  Facsimile: (408) 597-0196

                  If to KSI, to:

                  Kinetic Systems, Inc.
                  2805 Mission College Boulevard
                  Santa Clara, California 95054
                  Attention: General Counsel
                  Facsimile: (408) 597-0196

                  If to KFS to:

                  Kinetics Fluid Systems, Inc.
                  2805 Mission College Boulevard
                  Santa Clara, California 95054
                  Attention: General Counsel
                  Facsimile: (408) 597-0196

                                        2

<PAGE>

                If to KHC, to:

                Celerity Group, Inc.
                2805 Mission College Boulevard
                Santa Clara, California 95054
                Attention: General Counsel
                Facsimile: (408) 597-0196

                If to KH LLC
                2805 Mission College Boulevard
                Santa Clara, California 95054
                Attention: Officer
                Facsimile: (408) 597-0196

and any such communication shall be deemed to be given, made or served as of the
date so delivered or, in the case of any communication delivered by mail, as of
the date so received.

                  5. GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY AND
CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF CALIFORNIA,
WITHOUT REGARD TO SUCH STATE'S CHOICE OF LAW PROVISIONS.

                  6. ASSIGNMENT. No party may assign its rights or obligations
hereunder without the express written consent of the other parties hereto.
Subject to the foregoing, this Agreement will benefit and bind the successors
and assigns of the parties. No party will be a third party beneficiary of this
Agreement.

                  7. NO AGENCY. The parties hereto are independent contractors.
This Agreement will not be construed as creating an agency, partnership or any
other form of legal association (other than as expressly set forth herein)
between the parties.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                        3

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have entered into this
Reimbursement Agreement as of the date first written above and duly authorized
officers of each party have executed this Agreement at the location indicated
below.

                                    CELERITY GROUP, INC., a Delaware
                                    corporation

                                    By: /s/ John Goodman
                                        ----------------------------------------

                                    Name:_______________________________________

                                    Its:________________________________________

                                    KINETICS GROUP, INC., a Delaware corporation

                                    By: /s/ John Goodman

                                    Name:_______________________________________

                                    Its:________________________________________

                                    KINETIC SYSTEMS, INC., a California
                                    corporation

                                    By: /s/ John Goodman
                                        ----------------------------------------

                                    Name:_______________________________________

                                    Its:________________________________________

                                    CELERITY GROUP, INC., a California
                                    corporation

                                    By: /s/ John Goodman
                                        ----------------------------------------

                                    Name:_______________________________________

                                    Its:________________________________________

               [SIGNATURE PAGE TO KH LLC REIMBURSEMENT AGREEMENT]

<PAGE>

                                    KH LLC

                                    By: /s/ John Goodman
                                        ----------------------------------------

                                    Name:_______________________________________

                                    Its:________________________________________

        [SIGNATURE PAGE TO AMENDED AND RESTATED REIMBURSEMENT AGREEMENT]

<PAGE>

                                     Annex 1

                           Service Default Allocations

<TABLE>
<CAPTION>
     Guarantor                       Percentage
-----------------------------------------------
<S>                                  <C>
Celerity Group, Inc.                      50%
Kinetic Systems, Inc.                     50%
                                      ------
TOTAL                                 100.00%
</TABLE>

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00065-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00065-of-00352.parquet"}]]