Document:

<PAGE>

                                                                   EXHIBIT 10.13

                                 IRISH/EMISSIONS
                               PURCHASE AGREEMENT

      THIS IS AN PURCHASE AGREEMENT by and between Irish Investments, LLC, a
_________ limited liability company ("Irish"), and eMissions Testing, Inc, a
Georgia corporation ("eMissions"), dated as of September 15, 2000, and by which
Irish and eMissions, in consideration of the agreements set forth below (the
mutuality, adequacy and sufficiency of which are hereby acknowledged), hereby
agree as follows:

      1. GENERALLY AS TO PURCHASE & SALE.

            (a) PURCHASE AND SALE OF PROMISSORY NOTE. In the event the
Promissory Note (as defined below) has not been paid in full by the Closing Date
(as defined in Section 2), eMissions will sell to Irish, and Irish will purchase
from eMissions that certain promissory note made by Beachside Commons 1, LLC in
favor of eMissions in principal amount of $94,883.35 due August 2, 2000 (the
"Promissory Note").

            (b) PURCHASE PRICE. The Purchase Price is the aggregate cash
proceeds in connection with the sale of the first 100,000 shares of eMissions
common stock, no par value per share ("eMissions Common Stock"), owned by Irish
(the "Irish Shares"), which sale shall be made in accordance with the provisions
of this Agreement.

      2. CLOSING. At the Closing (which will consist of the deliveries set forth
below, none of which will be deemed to have been delivered unless and until all
of them have been delivered, and which will occur on the 45th day following the
date on which the registration statement filed by eMissions (the "Registration
Statement") relating to the resale of the Irish Shares and other outstanding
shares of eMissions Common Stock is declared effective by the Securities and
Exchange Commission (the "Closing Date"), or as the parties will otherwise
agree) the following will occur:

            (a) PURCHASE PRICE. Irish will cause to be delivered to eMissions
the Purchase Price by wire transfer of immediately available funds.

            (b) DELIVERY OF NOTE. eMissions will deliver the Promissory Note to
Irish.

The obligations of each party to take the foregoing actions are conditioned
upon: (i) the continuing correctness in all material respects of the
representations and warranties made by the other party in this Agreement and
(ii) the performance by the other party of all of its covenants and agreements
in this Agreement.

      3. REPRESENTATIONS AND WARRANTIES.

            (a) BY EMISSIONS. eMissions represents and warrants to Irish on the
date of this Agreement and again on and as of the date of the Closing that:

                                      199
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                  (v) POWER AND AUTHORITY TO SELL: eMissions has the corporate
power and authority to execute, deliver and other wise perform this Agreement
and the agreements, instruments and documents to be executed and delivered by it
pursuant to this Agreement.

                  (vi) DUE AUTHORIZATION AND EXECUTION: This Agreement has been,
and each other agreement, instrument and document to be executed and delivered
by eMissions pursuant to this Agreement will be, duly executed and delivered by
eMissions and each constitutes the legal, valid and binding obligation of
eMissions, enforceable in accordance with its terms, except as enforceability
may be limited by applicable bankruptcy, insolvency and other laws and equitable
principles affecting creditors' rights generally and the discretion of the
courts in granting equitable remedies.

                  (viii) EXECUTION, DELIVERY AND PERFORMANCE PERMITTED WITHOUT
VIOLATION: The execution, delivery and performance of this Agreement is, and of
the agreements, instruments and documents to be executed and delivered by
eMissions pursuant to this Agreement will be, in compliance with, and is not
(and will not be), assuming the giving of notice or the passage of time or both,
in violation of (A) eMissions' articles of incorporation or bylaws, (B) any
applicable law to which eMissions or any of its assets is subject or bound, or
(C) any contract, commitment, order, ruling or proceeding to which eMissions or
any of its assets is a party, subject or bound.

                  (iv) OWNERSHIP OF PROMISSORY NOTE: eMissions owns all right,
title and interest in and to the Promissory Note free and clear of all liens,
encumbrances or other adverse interests.

            (b) BY IRISH. Irish hereby represents and warrants to eMissions on
the date of this Agreement and again on and as of the date of the Closing:

                  (i) POWER AND AUTHORITY. Irish has the power and authority to
execute, deliver and perform this Agreement and the agreements, instruments and
documents to be executed and delivered by it pursuant to this Agreement.

                  (ii) AUTHORIZATION AND EXECUTION. This Agreement has been, and
each other agreement, instrument and document to be executed and delivered by
Irish pursuant to this Agreement will be, duly executed and delivered by Irish,
and each constitutes Irish's legal, valid and binding obligation, enforceable in
accordance with its terms, except as enforceability may be limited by applicable
bankruptcy, insolvency and other laws and equitable principles affecting
creditors' rights generally and the discretion of the courts in granting
equitable remedies.

                  (iii) OWNERSHIP OF SHARES. Irish owns all right, title and
interest in and to the Irish Shares free and clear of any liens, encumbrances,
adverse rights and claims of any kind whatsoever.

                  (iv) POWER AND AUTHORITY TO SELL. Irish has the power and
authority to sell the Irish Shares and to deliver the proceeds to eMissions
pursuant to this Agreement free and clear as provided in clause (iii) above and
to execute, deliver and otherwise perform this

                                      200
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Agreement and the agreements, instruments and documents to be executed and
delivered by it pursuant to this Agreement.

      4. COVENANTS & AGREEMENTS.

            (a) SALE OF IRISH SHARES. Irish hereby covenants and agrees to sell
the Irish Shares pursuant to the Registration Statement prior to the Closing
Date and to deliver written instructions to each broker involved in the sale of
the Irish Shares providing that such broker shall hold the proceeds of the sale
of any Irish Shares in a brokerage account until the Closing Date and deliver
such proceeds to eMissions at the direction of Irish on the Closing Date by wire
transfer. Notwithstanding the foregoing, the amount of the proceeds from the
sale of the Irish Shares shall not be less than the outstanding principal amount
plus all accrued interest and fees due and payable on the Promissory Note as of
the Closing Date.

            (b) EXPENSES. Each party to this Agreement will pay its own expenses
and costs incurred in connection with the negotiation and consummation of this
Agreement and the transactions contemplated by this Agreement. Notwithstanding
the foregoing, Irish will pay all costs and fees in connection with the sale of
the Irish Shares and the delivery of the proceeds as the Purchase Price pursuant
to this Agreement.

            (c) PERFORMANCE OF OBLIGATIONS; MAINTENANCE OF REPRESENTATIONS &
WARRANTIES. The parties will in good faith undertake: (i) to perform their
covenants and agreements, and satisfy all conditions, in this Agreement; (ii) to
cause their representations and warranties to remain true and correct; and (iii)
to cause the transactions contemplated in this Agreement to be carried out
promptly in accordance with the terms of this Agreement

            (d) FAILURE TO PERFORM BY IRISH. In the event the Promissory Note
has not been repaid on the Closing Date and Irish fails to deliver the Purchase
Price on the Closing Date, Irish hereby agrees to deliver all of the shares of
eMissions Common Stock owned by Irish to eMissions on the Closing Date and to
forfeit all right, title and interest in such shares in favor of eMissions.

            (e) COLLATERAL FOR PROMISSORY NOTE. Upon the execution this
Agreement, Beachside Commons 1, LLC ("Beachside") shall grant to eMissions a
security interest in certain of the real property and improvements owned by
Beachside located at 2900 Atlantic Avenue, Fernandina Beach, Florida 32054 and
to execute all necessary documents and agreements to validly create and perfect
such security interest.

      5. MISCELLANEOUS.

            (a) GOOD FAITH EFFORTS; FURTHER ASSURANCES; COOPERATION. The parties
will in good faith undertake to perform their obligations in this Agreement, to
satisfy all conditions and to cause the transactions contemplated in this
Agreement to be carried out promptly in accordance with the terms of this
Agreement. Upon the execution of this Agreement and thereafter, each party will
do such things as may be reasonably requested by the other party to this
Agreement in order more effectively to consummate or to document the
transactions

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contemplated by this Agreement. The parties will cooperate with each other and
their respective counsel, accountants or designees in connection with any steps
required to be taken as part of their respective rights and obligations under
this Agreement.

            (b) NOTICES. Each notice, communication and delivery under this
Agreement: (i) will be made in writing signed by the party making the same; (ii)
will specify the Section pursuant to which it is given; (iii) will be given
either in person or by a nationally recognized next business day delivery
service for next day delivery; and (iv) if not given in person, will be given to
a party at the address set forth below such party's signature (or at such other
address as a party may furnish to the other parties pursuant to this
subsection). If notice is given pursuant to this subsection of a permitted
successor or assign of a party, then notice will also thereafter be given as set
forth above to such successor or assign of such party.

            (c) ASSIGNMENT. No assignment or transfer by a party of its rights
and obligations under this Agreement will be made by merger or other operation
of law or otherwise except with the prior written consent of the other party
(which may not be unreasonably withheld or delayed).

            (d) RULES OF CONSTRUCTION. For purposes of this Agreement: (i)
including and any other words or phrases of inclusion will not be construed as
terms of limitation, so that references to included matters will be regarded as
non-exclusive, non-characterizing illustrations; (ii) when "Section,"
"Subsection," or "Exhibit" is capitalized in this Agreement, such refers to such
item of or to this Agreement; (iii) titles and captions of or in this Agreement
are inserted only as a matter of convenience and in no way define, limit, extend
or describe the scope of this Agreement or the intent of any of its provisions;
(iv) whenever the context so requires, the singular includes the plural and the
plural includes the singular, and the gender of any pronoun includes the other
genders; (v) each exhibit and schedule referred to in this Agreement and each
attachment to any of them or this Agreement is hereby incorporated by reference
into this Agreement and is made a part of this Agreement as if set out in full
in the first place that reference is made to it; and (vi) acknowledging that
parties have participated jointly in the negotiation and drafting of this
Agreement, if an ambiguity or question of intent or interpretation arises as to
any aspect of this Agreement, then it will be construed as if drafted jointly by
the parties and no presumption or burden of proof will arise favoring or
disfavoring any party by virtue of the authorship of any provision of this
Agreement.

            (e) SEVERABILITY. Any determination by any court of competent
jurisdiction of the invalidity of any provision of this Agreement that is not
essential for accomplishing its purposes will not affect the validity of any
other provision of this Agreement, which will remain in full force and effect
and which will be construed as to be valid under applicable law.

            (f) CONTROLLING LAW; INTEGRATION; AMENDMENT; WAIVER; REMEDIES
CUMULATIVE. This Agreement is governed by, and will be construed and enforced in
accordance with, the laws of the State of Georgia except the laws of that state
that would render such choice of laws ineffective. This Agreement and the other
agreements contemplated by this Agreement supersede all prior negotiations,
agreements and understandings between the parties as to its subject matter,
constitute the entire agreement between the parties as to its subject matter and

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may not be altered or amended except in writing signed by the parties. The
failure of any party at any time or times to require performance of any
provision of this Agreement will in no manner affect the right to enforce the
same; and no waiver by any party of any provision (or of a breach of any
provision) of this Agreement, whether by conduct or otherwise, in any one of
more instances will be deemed or construed either as a further or continuing
waiver of any such provision or breach or as a waiver of any other provision (or
of a breach of any other provision) of this Agreement.

            (g) COPIES. This Agreement may be executed in two or more copies,
each of which will be deemed an original, and it will not be necessary in making
proof of this Agreement or its terms to produce or account for more than one of
such copies.

      DULY EXECUTED and delivered by Irish and eMissions as of September 15,
2000.

eMissions:                                    eMissions Testing, Inc
---------

                                           By: /s/ William S. Estroff
                                              ----------------------------------
                                              William S. Estroff       President
                                              ------------------

Irish:                                     Irish Investments, LLC
-----

                                           By: /s/ Joseph Powell
                                              ----------------------------------
                                           Name: Joseph Powell
                                                --------------------------------
                                           Title: Manager
                                                 -------------------------------

Accepted and Agreed to by:                 BEACHSIDE COMMON1, LLC

                                           By: /s/ Gerald F. Sullivan
                                              ----------------------------------
                                           Name: Gerald F. Sullivan
                                                --------------------------------
                                           Title: President
                                                 -------------------------------

                                           (for purposes of Section 4(e) of this
                                           Agreement)

                                      * * *

                                      203Exhibit 10.9

               SECOND AMENDMENT AND WAIVER TO AMENDED AND RESTATED
                           REVOLVING CREDIT AGREEMENT

            THIS SECOND  AMENDMENT AND WAIVER TO AMENDED AND RESTATED  REVOLVING
CREDIT  AGREEMENT  (this  "Amendment")  made as of February 7, 2000 by and among
NUCO2 INC., a Florida  corporation  (the  "Company"),  SUNTRUST  BANK, a Georgia
banking  corporation  (formerly  named  SunTrust Bank,  South Florida,  National
Association,  a  national  banking  association)   ("SunTrust"),   BANK  AUSTRIA
CREDITANSTALT   CORPORATE   FINANCE,   INC.,   a   Delaware   corporation   (the
"Documentation  Agent"), THE PROVIDENT BANK, an Ohio banking  corporation,  BANK
LEUMI LE-ISRAEL B.M., Miami Agency, IBJ WHITEHALL BUSINESS CREDIT CORPORATION, a
New York corporation,  HAMILTON BANK, N.A., a national banking association,  and
any other banks or other lending institutions that are or will become parties to
this Agreement (collectively,  the "Lenders" and each individually, a "Lender"),
and SUNTRUST BANK, a Georgia banking corporation  (formerly named SunTrust Bank,
South Florida, National Association,  a national banking association),  as agent
for the Lenders.

                             PRELIMINARY STATEMENTS:

            The  Company,  Agent and the  Lenders  are  parties to that  certain
Amended and Restated  Revolving  Credit Agreement dated as of May 4, 1999 and as
amended by that certain First Amendment to Amended and Restated Revolving Credit
Agreement dated as of June 16, 1999 (the "Credit  Agreement";  capitalized terms
used herein and not defined  herein shall have the meanings  assigned to them in
the Credit  Agreement),  pursuant to which the Lenders made and continue to make
certain financial accommodations to the Company;

            The Company has  requested,  and the Lenders have  agreed,  to amend
certain  financial  covenants and to make certain other  amendments on the terms
and subject to the conditions set forth herein.

            NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged,  the parties hereto,  intending to
be legally bound, agree as follows:

1.          Amendments to Credit Agreement.

            a.  Section  1.01 of the  Credit  Agreement  is  hereby  amended  by
replacing  the  definition  of  "Agent"  in  its  entirety  with  the  following
definition:

<PAGE>

                  "Agent"   shall  mean   SunTrust   Bank,  a  Georgia   banking
corporation (formerly named SunTrust Bank, South Florida,  National Association,
a national banking association) as agent for the Lenders hereunder and under the
other Loan Documents, and each successor agent.

            b.  Section  7.02 of the  Credit  Agreement  is  hereby  amended  by
replacing such Section 7.02 in its entirety with the following:

                        SECTION 7.02 Interest  Coverage Ratio. The Company shall
            not permit  the  Interest  Coverage  Ratio as of the last day of any
            fiscal  quarter of the  Company to be less than (i) 1.50 to 1.00 for
            the period beginning October 1, 1999 through and including  December
            31, 1999; (ii) 1.65 to 1.00 for the period beginning January 1, 2000
            through and  including  March 31,  2000;  (iii) 1.80 to 1.00 for the
            period  beginning April 1, 2000 through and including June 30, 2000;
            (iv) 2.00 to 1.00 for the period  beginning July 1, 2000 through and
            including  September  30,  2000;  (v)  2.15 to 1.00  for the  period
            beginning  October 1, 2000 through and including  December 31, 2000;
            (vi) 2.35 to 1.00 for the period  beginning  January 1, 2001 through
            and  including  March 31,  2001;  (vii)  2.45 to 1.00 for the period
            beginning  April 1, 2001 through and  including  June 30, 2001;  and
            (viii) 2.75 to 1.00 thereafter.

            c.  Section  7.04 of the  Credit  Agreement  is  hereby  amended  by
replacing such Section 7.04 in its entirety with the following:

                        SECTION 7.04 Minimum Net Worth. The Company shall at all
            times  maintain  its Net Worth  greater  than the Minimum Net Worth,
            equal to (i)  $40,000,000,  plus  (ii)  fifty  percent  (50%) of the
            cumulative Consolidated Net Income for each fiscal quarter beginning
            after the fiscal quarter ending on March 31, 1999  (specifically not
            including any Consolidated  Net Loss for any fiscal  quarter),  plus
            (iii) the  cumulative  net proceeds of all equity  offerings made by
            the Company after the Closing Date.

2.          Waiver.

            a. The Company has informed the Agent and the Required  Lenders that
the Company has not been in  compliance  with certain  provisions  of the Credit
Agreement.  Therefore,  as requested by the Company, the Required Lenders hereby
waive any  Default  or Event of Default  arising  under  Section  8.01(d) of the
Credit  Agreement  caused by any such  failure of the Company to comply with the
financial  covenant  with respect to Minimum Net Worth set forth in Section 7.04
of the Credit Agreement, for the period from October 1, 1999 through February 7,
2000,  for this one time only,  and no future  waiver  shall be construed by the
waiver hereby given.

3.          Other Agreements.

            a. The Company hereby affirms that each of the  representations  and
warranties  of the Company  contained in the Credit  Agreement  and in any other
Loan Documents  (except to the extent that any such  representation  or warranty
expressly relates solely to an earlier date and for

                                       2

<PAGE>

changes therein permitted or contemplated by the Credit Agreement) is correct in
all material  respects on and as of the date hereof and after  giving  effect to
this Amendment.  In addition,  with respect to this Amendment,  Company warrants
and represents  that the execution,  delivery and performance by Company of this
Amendment  (i) are within the  Company's  corporate  power;  (ii) have been duly
authorized  by all  necessary  or  proper  corporate  action;  (iii)  are not in
contravention of any provision of the Company's  certificate of incorporation or
bylaws;  (iv) will not violate any law or regulation,  or any order or decree of
any Governmental  Authority;  (v) will not conflict with or result in the breach
or  termination  of,  constitute a default under or accelerate  any  performance
required by, any indenture,  mortgage,  deed of trust, lease, agreement or other
instrument to which the Company is a party or by which the Company or any of its
property is bound;  (vi) will not result in the  creation or  imposition  of any
Lien upon any of the  property of the  Company  other than those in favor of the
Agent for the benefit of the Lenders,  all pursuant to the Loan  Documents;  and
(vii) do not require the  consent or  approval  of any  Governmental  Authority.
Company  further  represents  and  warrants  that this  Amendment  has been duly
executed  and  delivered  for the  benefit  of or on behalf of the  Company  and
constitutes a legal,  valid and binding  obligation of the Company,  enforceable
against the Company in accordance with its terms.

            b. As  amended  hereby,  all terms of the Credit  Agreement  and the
other  Loan  Documents  shall be and  remain in full  force and effect and shall
constitute the legal, valid, binding and enforceable  obligations of the Company
to the Agent and the  Lenders.  To the  extent any terms and  conditions  in any
other  Loan  Documents  shall  contradict  or be in  conflict  with any terms or
conditions of the Credit Agreement,  after giving effect to this Amendment, such
terms and  conditions  are hereby  deemed  modified and amended  accordingly  to
reflect the terms and conditions of the Credit Agreement as modified and amended
hereby.

            c. The Company  hereby  restates,  ratifies and  reaffirms  each and
every term and  condition  set forth in the Credit  Agreement and the other Loan
Documents,  effective as of the date hereof,  and represents  that, after giving
effect to this  Amendment,  no Default or Event of Default has  occurred  and is
continuing as of the date hereof.

            d. The Company agrees to pay on demand all costs and expenses of the
Agent in connection with the preparation, execution, delivery and enforcement of
this Amendment,  the closing  hereof,  and any other  transactions  contemplated
hereby, including the fees and out-of-pocket expenses of the Company's counsel.

            e. THIS AMENDMENT  SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE
WITH THE INTERNAL LAWS (AND NOT THE LAWS OF CONFLICTS),  OF THE STATE OF FLORIDA
AND ALL APPLICABLE LAWS OF THE UNITED STATES OF AMERICA.

                  (Remainder of Page Intentionally Left Blank)

                                       3

<PAGE>

            IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be duly  executed  under  seal  by  their  respective  officers  thereunto  duly
authorized, as of the date first above written.

                                      NUCO2 INC.,
                                      a Florida corporation

                                      By: /s/ Joann Sabatino
                                          --------------------------------------
                                          Joann Sabatino
                                          Chief Financial Officer and Treasurer

                                      Attest: /s/ Eric M. Wechsler
                                              ---------------------------------
                                              Eric M. Wechsler
                                              General Counsel and Secretary

<PAGE>

                                      SUNTRUST BANK
                                      individually and as Agent
                                      By: /s/ Russell E. Burnette
                                          --------------------------------------
                                          Russell E. Burnette
                                          Vice President

                                      BANK AUSTRIA CREDITANSTALT
                                      CORPORATE FINANCE, INC.,
                                      individually and as Documentation Agent

                                      By: /s/ Scott Kray
                                          -------------------------------------
                                          Name: Scott Kray
                                          Title: Vice President

                                      By: /s/ Gary Andresen
                                          -------------------------------------
                                          Name: Gary Andresen
                                          Title: Sr. Associate

                                      BANK-LEUMI LE-ISRAEL B.M.,
                                      MIAMI AGENCY
                                      By: /s/ Stephen Hanas
                                          -------------------------------------
                                            Name: Stephen Hanas
                                            Title: Vice President

                                      THE PROVIDENT BANK
                                      By: /s/ Nick Jevic
                                          -------------------------------------
                                            Name: Nick Jevic
                                            Title: Vice President

                                      IBJ WHITEHALL BUSINESS CREDIT
                                      CORPORATION
                                      By: /s/ John C. Williams
                                          -------------------------------------
                                            Name: John C. Williams
                                            Title: Vice President

                                      HAMILTON BANK, N.A.

                                      By: /s/ Roberto R. Munoz
                                          -------------------------------------
                                            Name: Roberto Munoz
                                            Title: Vice President

                                      By: /s/ Hector F. Ramirez
                                          -------------------------------------
                                            Name: Hector F. Ramirez
                                             Title: Senior Vice President

<PAGE>

                          ACKNOWLEDGMENT OF GUARANTORS

            Each of the Guarantors  acknowledges  and agrees to the terms of the
foregoing Second Amendment to Amended and Restated  Revolving Credit  Agreement,
and  further  acknowledges  and agrees  that (i) all of the  obligations  of the
Company shall  continue to constitute  "Guaranteed  Obligations"  covered by the
Amended and Restated Guaranty  Agreement dated as of May 4, 1999 executed by the
undersigned,  and (ii) the Amended and Restated Guaranty  Agreement is and shall
remain in full  force and  effect  on and after the date  hereof,  and (iii) the
foregoing agreement shall in no way release,  discharge,  or otherwise limit the
obligations of such Guarantor under the Amended and Restated Guaranty Agreement.

            This  Acknowledgment  of  Guarantors  is made  and  delivered  as of
February 7, 2000.

                                         GUARANTORS:

                                         NUCO2 ACQUISITION CORP.,
                                         a Florida corporation

                                         By: /s/ Eric M. Wechsler
                                             ----------------------------------
                                             Name:  Eric M. Wechsler
                                              Title:  Vice President

                                         [CORPORATE SEAL]

                                         KOCH COMPRESSED GASES, INC.,
                                         a New Jersey corporation

                                         By: /s/ Eric M. Wechsler
                                             ----------------------------------
                                             Name:  Eric M. Wechsler
                                             Title:  Vice President

                                         [CORPORATE SEAL]

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