Document:

NATURAL GAS SYSTEMS, INC.
                                 2004 STOCK PLAN

                             STOCK OPTION AGREEMENT

Name of Optionee:                       Daryl V. Mazzanti

Optioned Shares:                        350,000 shares of common stock, $0.001
                                        par value, of Natural Gas Systems, Inc.

Type of Option:                         INCENTIVE STOCK OPTION

Exercise Price Per Share:               $1.61

Option Grant Date:                      June 23, 2005

Vesting Commencement Date               June 23, 2005

Date Option Becomes Exercisable:        This Option may be exercised with
                                        respect to an 1/16th of the total
                                        Optioned Shares subject to this option
                                        when the Optionee completes each three
                                        months of continuous employment
                                        starting from the Vesting Commencement
                                        Date. This option may become
                                        exercisable on an accelerated basis
                                        under Section 8 of this Stock Option
                                        Agreement.

Expiration Date of Option:              June 23, 2015. This Option expires
                                        earlier if the Optionee's employment
                                        terminates earlier, as provided in
                                        Section 11 of the Plan.
<PAGE>

         This Stock Option Agreement (this "Agreement") is executed and
delivered as of June 23, 2005 by and between Natural Gas Systems, Inc., a Nevada
corporation (the "Company") and the Optionee. The Optionee and the Company
hereby agree as follows:

1.   The Company, pursuant to the Natural Gas Systems, Inc. 2004 Stock Plan (the
     "Plan"), which is incorporated herein by reference, and subject to the
     terms and conditions thereof, hereby grants to the Optionee an option to
     purchase the Optioned Shares at the Exercise Price Per Share.

2.   The option granted hereby ("Option") shall be treated as an incentive stock
     option under the Internal Revenue Code.

3.   The Option granted hereby shall terminate, subject to the provisions of the
     Plan, no later than at the close of business on the Expiration Date.

4.   The Optionee shall comply with and be bound by all the terms and conditions
     contained in the Plan, as incorporated by reference herein.

5.   Options granted hereby shall not be transferable except by will or the laws
     of descent and distribution. During the lifetime of the Optionee, the
     Option may be exercised only by the Optionee, the guardian or legal
     representative of the Optionee.

6.   The obligation of the Company to sell and deliver any stock under this
     Option is specifically subject to all provisions of the Plan and all
     applicable laws, rules, regulations and governmental and stockholder
     approvals.

7.   Any notice by the Optionee to the Company hereunder shall be in writing and
     shall be deemed duly given only upon receipt thereof by the Company at its
     principal offices. Any notice by the Company to the Optionee shall be in
     writing and shall be deemed duly given if mailed to the Optionee at the
     address last specified to the Company by the Optionee.

8.   In addition to the change of control provisions specified under Section
     14(e) of the Plan and the other conditions set forth in this Agreement, the
     Company hereby agrees that all or part of this Option may be exercised
     prior to its expiration at the time or times set forth below:

              (a) If the Company is subject to a Change in Control (as defined
     in below in this Agreement and not as defined in the Plan) before the
     Optionee's employment terminates, this Option shall become exercisable in
     full if and only if (i) this Option does not remain outstanding following
     the Change in Control; (ii) this Option is not assumed by the surviving
     corporation or its parent; (iii) the surviving corporation or its parent
     does not substitute an option with substantially the same terms for this
     Option; OR (iv) the full value of the vested shares under this Option is
     not settled in cash or cash equivalents.

              (b) If the Option is not exercisable in full under Paragraph (a)
     above, AND if the Optionee is subject to an Involuntary Termination
     (defined below) within 12 months after the Change in Control, then this
     Option shall become exercisable in full. However, in the case of an
     employee incentive stock option described in Section 422(b) of the Code,
     the acceleration of exercisability shall not occur without the Optionee's
     written consent.

                                      -1-
<PAGE>

              (c) If the Option is not exercisable in full under Paragraph (a)
     above, AND if the Company is subject to a Change of Control, then fifty
     percent (50%) of the remaining options shall become exercisable in full,
     and the remaining options shall become exercisable at the rate set forth
     herein, reduced by the accelerated Optioned Shares. All other terms and
     conditions shall remain unchanged.

              (d) Definitions:

                  (i) "Change in Control" shall mean: (1)The consummation of a
              merger or consolidation of the Company with or into another entity
              or any other corporate reorganization, if persons who were not
              controlling stockholders of the Company immediately prior to such
              merger, consolidation or other reorganization own immediately
              after such merger, consolidation or other reorganization 50% or
              more of the voting power of the outstanding securities of each of
              (A) the continuing or surviving entity and (B) any direct or
              indirect parent corporation of such continuing or surviving
              entity; OR (2) The sale, transfer or other disposition of all or
              substantially all of the Company's assets.

              A transaction shall not constitute a Change in Control if its
              sole purpose is to change the state of the Company's
              incorporation or to create a holding company that will be
              owned in substantially the same proportions by the persons who
              held the Company's securities immediately before such
              transaction.

                  (ii) "Involuntary Termination" shall mean the termination of
              the Optionee's employment by reason of: (1) The involuntary
              discharge of the Optionee by the Company for reasons other than
              Cause (as defined in Optionee's employment agreement with the
              Company, of even date herewith); or (2) The voluntary resignation
              of the Optionee following a reduction in the Optionee's base
              salary, a substantial reduction of the responsibilities, authority
              or scope of work of Executive, or receipt of notice that the
              Optionee's principal workplace will be relocated more than 20
              miles.

9.    The validity and construction of this Agreement shall be governed by the
      laws of the State of Nevada.

This Agreement is made under and subject to the provisions of the Plan, and all
of the provisions of the Plan are also provisions of this Agreement. If there is
a difference or conflict between the provisions of this Agreement and the
provisions of the Plan, the provisions of the Plan will govern; provided,
however, the acceleration of the Optioned Shares described in Section 8 above
shall govern in the event of any conflict with the Plan. By signing this
Agreement, the Optionee accepts and agrees to all of the foregoing terms and
provisions and to all of the terms and provisions of the Plan incorporated
herein by reference and confirms that he or she has received a copy of the Plan.

                                      -2-
<PAGE>

         IN WITNESS WHEREOF, the Company has caused this Agreement to be
executed by a duly authorized representative and the Optionee has hereunto set
his hand as of the date here above first written.

                                          Natural Gas Systems, Inc.:

                                          By:
                                             -----------------------------------
                                             Name:     Robert S. Herlin
                                             Title:    President

                                          --------------------------------------
                                          Optionee:    Daryl V. Mazzanti

                                      -3-NATURAL GAS SYSTEMS, INC.
                                2004 STOCK PLAN:

                             SUMMARY OF STOCK GRANT
                  By your signature and the signature of the Company's
representative below, you and the Company agree that you are receiving shares
subject to the terms and conditions of the 2004 Stock Plan and the Stock Grant
Agreement, both of which are attached to and made a part of this document.

     Name of Transferee:                  Daryl V. Mazzanti

     Total Number of Transferred          25,000
     Shares:

     Sale Price Per Share:                $0.001

     Fair Market Value Per Share:         $1.61

     Date of Transfer:                    June 23, 2005

     Vesting Commencement Date:           June 23, 2005

     Vesting Schedule:                    The Forfeiture Condition shall lapse
                                          with respect to the first 1/12th of
                                          the Transferred Shares when the
                                          Transferee completes one month of
                                          continuous Service after the Vesting
                                          Commencement Date. The Forfeiture
                                          Condition shall lapse with respect to
                                          an additional 1/12th of the
                                          Transferred Shares when the Transferee
                                          completes each month of continuous
                                          Service thereafter.

TRANSFEREE:                            NATURAL GAS SYSTEMS, INC.

                                      By:
-----------------------------------          ------------------------------
By:                                   Robert S. Herlin, President

<PAGE>

                            NATURAL GAS SYSTEMS, INC.
                                2004 STOCK PLAN:
                      STOCK GRANT AGREEMENT (FOR SERVICES)

SECTION 1.        ACQUISITION OF SHARES.

                  (a) Transfer. On the terms and conditions set forth in the
Summary of Stock Grant and this Agreement, the Company sell to the Transferee,
and the Transferee agrees to purchase, the number of Shares set forth in the
Summary of Stock Grant at the Sale Price, as set forth above. The transfer shall
occur at the offices of the Company on the date of transfer set forth in the
Summary of Stock Grant or at such other place and time as the parties may agree.

                  (b) Consideration. The Transferee and the Company agree that
the Transferred Shares are being issued to the Transferee as consideration for a
portion of the services performed by the Transferee for the Company. The value
of such portion is agreed to be not less than 100% of the Fair Market Value of
the Transferred Shares.

                  (c) Stock Plan and Defined Terms. The transfer of the
Transferred Shares is subject to the Plan, a copy of which the Transferee
acknowledges having received. The provisions of the Plan are incorporated into
this Agreement by this reference. Capitalized terms are defined in Section 12 of
this Agreement.

SECTION 2.        FORFEITURE CONDITION.

                  (a) Scope of Forfeiture Condition. All Transferred Shares
initially shall be Restricted Shares and shall be subject to forfeiture to the
Company. The Transferee shall not transfer, assign, encumber or otherwise
dispose of any Restricted Shares without the Company's written consent, except
as provided in the following sentence. The Transferee may transfer Restricted
Shares to one or more members of the Transferee's Immediate Family or to a trust
established by the Transferee for the benefit of the Transferee and/or one or
more members of the Transferee's Immediate Family, provided in either case that
the Transferee agrees in writing on a form prescribed by the Company to be bound
by all provisions of this Agreement. If the Transferee transfers any Restricted
Shares, then this Agreement shall apply to the Subsequent Transferee to the same
extent as to the Transferee.
<PAGE>

                  (b) Vesting. The Forfeiture Condition shall lapse and the
Restricted Shares shall become vested in accordance with the vesting schedule
set forth in the Summary of Stock Grant. The Company may, at its sole
discretion, accelerate the vesting and waive the Forfeiture Condition, at any
time.

                  (c) Execution of Forfeiture. The Forfeiture Condition shall be
applicable only if the Transferee's Service terminates for Cause, including
(without limitation) death or disability of Daryl Mazzanti, before all
Restricted Shares have become vested. In the event that the Transferee's Service
terminates for Cause, the certificate(s) representing any remaining Restricted
Shares shall be delivered to the Company properly endorsed for transfer. The
Company shall make no payment for Restricted Shares that are forfeited.

                  (d) Additional Shares or Substituted Securities. In the event
of the declaration of a stock dividend, the declaration of an extraordinary
dividend payable in a form other than stock, a spin-off, a stock split, an
adjustment in conversion ratio, a recapitalization or a similar transaction
affecting the Company's outstanding securities without receipt of consideration,
any new, substituted or additional securities or other property (including money
paid other than as an ordinary cash dividend) which are by reason of such
transaction distributed with respect to any Restricted Shares or into which such
Restricted Shares thereby become convertible shall immediately be subject to the
Forfeiture Condition. Appropriate adjustments to reflect the distribution of
such securities or property shall be made to the number and/or class of the
Restricted Shares.
<PAGE>

                  (e) Termination of Rights as Stockholder. If Restricted Shares
are forfeited in accordance with this Section 2, then the person who is to
forfeit such Restricted Shares shall no longer have any rights as a holder of
such Restricted Shares. Such Restricted Shares shall be deemed to have been
forfeited in accordance with the applicable provisions hereof, whether or not
the certificate(s) therefor have been delivered as required by this Agreement.

                  (f) Escrow. Upon issuance, the certificates for Restricted
Shares shall be deposited in escrow with the Company to be held in accordance
with the provisions of this Agreement. Any new, substituted or additional
securities or other property described in Subsection (d) above shall immediately
be delivered to the Company to be held in escrow, but only to the extent the
Transferred Shares are at the time Restricted Shares. All regular cash dividends
on Restricted Shares (or other securities at the time held in escrow) shall be
paid directly to the Transferee and shall not be held in escrow. Restricted
Shares, together with any other assets or securities held in escrow hereunder,
shall be (i) surrendered to the Company for forfeiture and cancellation in the
event that the Forfeiture Condition applies or (ii) released to the Transferee
upon the Transferee's request to the extent the Transferred Shares are no longer
Restricted Shares (but not more frequently than once every six months). In any
event, all Transferred Shares that have vested (and any other vested assets and
securities attributable thereto) shall be released within 60 days after the
earlier of the termination of the Transferee's Service.

SECTION 3.        OTHER RESTRICTIONS ON TRANSFER.

                  (a) Transferee Representations. In connection with the
issuance and acquisition of Shares under this Agreement, the Transferee hereby
represents and warrants to the Company as follows:

<PAGE>

                           (i) The Transferee is acquiring and will hold the
         Transferred Shares for investment for his or her account only and not
         with a view to, or for resale in connection with, any "distribution"
         thereof within the meaning of the Securities Act.

                           (ii) The Transferee understands that the Transferred
         Shares have not been registered under the Securities Act by reason of a
         specific exemption therefrom and that the Transferred Shares must be
         held indefinitely, unless they are subsequently registered under the
         Securities Act or the Transferee obtains an opinion of counsel, in form
         and substance satisfactory to the Company and its counsel, that such
         registration is not required. The Transferee further acknowledges and
         understands that the Company is under no obligation to register the
         Transferred Shares.

                           (iii) The Transferee is aware of the adoption of Rule
         144 by the Securities and Exchange Commission under the Securities Act,
         which permits limited public resales of securities acquired in a
         non-public offering, subject to the satisfaction of certain conditions,
         including (without limitation) the availability of certain current
         public information about the issuer, the resale occurring only after
         the holding period required by Rule 144 has been satisfied, the sale
         occurring through an unsolicited "broker's transaction," and the amount
         of securities being sold during any three-month period not exceeding
         specified limitations. The Transferee acknowledges and understands that
         the conditions for resale set forth in Rule 144 have not been satisfied
         and that the Company has no plans to satisfy these conditions in the
         foreseeable future.

<PAGE>

                           (iv) The Transferee will not sell, transfer or
         otherwise dispose of the Transferred Shares in violation of the
         Securities Act, the Securities Exchange Act of 1934, or the rules
         promulgated thereunder, including Rule 144 under the Securities Act.
         The Transferee agrees that he or she will not dispose of the
         Transferred Shares unless and until he or she has complied with all
         requirements of this Agreement applicable to the disposition of
         Transferred Shares and he or she has provided the Company with written
         assurances, in substance and form satisfactory to the Company, that (A)
         the proposed disposition does not require registration of the
         Transferred Shares under the Securities Act or all appropriate action
         necessary for compliance with the registration requirements of the
         Securities Act or with any exemption from registration available under
         the Securities Act (including Rule 144) has been taken and (B) the
         proposed disposition will not result in the contravention of any
         transfer restrictions applicable to the Transferred Shares under
         applicable state law.

                           (v) The Transferee has been furnished with, and has
         had access to, such information as he or she considers necessary or
         appropriate for deciding whether to invest in the Transferred Shares,
         and the Transferee has had an opportunity to ask questions and receive
         answers from the Company regarding the terms and conditions of the
         issuance of the Transferred Shares.

                           (vi) The Transferee is aware that his or her
         investment in the Company is a speculative investment that has limited
         liquidity and is subject to the risk of complete loss. The Transferee
         is able, without impairing his or her financial condition, to hold the
         Transferred Shares for an indefinite period and to suffer a complete
         loss of his or her investment in the Transferred Shares.
<PAGE>

                           (vii) Transferee is an "accredited investor" as
         defined under Exhibit I attached hereto.

                  (b) Securities Law Restrictions. Regardless of whether the
offering and sale of Shares under the Plan have been registered under the
Securities Act or have been registered or qualified under the securities laws of
any state, the Company at its discretion may impose restrictions upon the sale,
pledge or other transfer of the Transferred Shares (including the placement of
appropriate legends on stock certificates or the imposition of stop-transfer
instructions) if, in the judgment of the Company, such restrictions are
necessary or desirable in order to achieve compliance with the Securities Act,
the securities laws of any state or any other law.

                  (c) Market Stand-Off. In connection with any underwritten
public offering by the Company of its equity securities pursuant to an effective
registration statement filed under the Securities Act, including the Company's
initial public offering, the Transferee shall not directly or indirectly sell,
make any short sale of, loan, hypothecate, pledge, offer, grant or sell any
option or other contract for the purchase of, purchase any option or other
contract for the sale of, or otherwise dispose of or transfer, or agree to
engage in any of the foregoing transactions with respect to, any Transferred
Shares without the prior written consent of the Company or its underwriters.
Such restriction (the "Market Stand-Off") shall be in effect for such period of
time following the date of the final prospectus for the offering as may be
requested by the Company or such underwriters. In no event, however, shall such
period exceed 180 days. The Market Stand-Off shall in any event terminate two
years after the date of the Company's initial public offering. In the event of
the declaration of a stock dividend, a spin-off, a stock split, an adjustment in
conversion ratio, a recapitalization or a similar transaction affecting the
Company's outstanding securities without receipt of consideration, any new,
substituted or additional securities which are by reason of such transaction
distributed with respect to any Shares subject to the Market Stand-Off, or into
which such Shares thereby become convertible, shall immediately be subject to
the Market Stand-Off. In order to enforce the Market Stand-Off, the Company may
impose stop-transfer instructions with respect to the Transferred Shares until
the end of the applicable stand-off period. The Company's underwriters shall be
beneficiaries of the agreement set forth in this Subsection (c). This Subsection
(c) shall not apply to Shares registered in the public offering under the
Securities Act, and the Transferee shall be subject to this Subsection (c) only
if the directors and officers of the Company are subject to similar
arrangements.

<PAGE>

                  (d) Rights of the Company. The Company shall not be required
to (i) transfer on its books any Transferred Shares that have been sold or
transferred in contravention of this Agreement or (ii) treat as the owner of
Transferred Shares, or otherwise to accord voting, dividend or liquidation
rights to, any Subsequent Transferee to whom Transferred Shares have been
transferred in contravention of this Agreement.

SECTION 4.        SUCCESSORS AND ASSIGNS.

                  Except as otherwise expressly provided to the contrary, the
provisions of this Agreement shall inure to the benefit of, and be binding upon,
the Company and its successors and assigns and be binding upon the Transferee
and the Transferee's legal representatives, heirs, legatees, distributees,
assigns and transferees by operation of law, whether or not any such person has
become a party to this Agreement or has agreed in writing to join herein and to
be bound by the terms, conditions and restrictions hereof.

SECTION 5.        NO RETENTION RIGHTS.

                  Nothing in this Agreement or in the Plan shall confer upon the
Transferee any right to continue providing services to the Company for any
period of specific duration or interfere with or otherwise restrict in any way
the rights of the Company or of the Transferee, which rights are hereby
expressly reserved by each, to terminate his or her service at any time and for
any reason, with or without cause.

<PAGE>

SECTION 6.        TAX ELECTION.

                  The acquisition of the Transferred Shares may result in
adverse tax consequences that may be avoided or mitigated by filing an election
under Code Section 83(b). Such election may be filed only within 30 days after
the date of transfer set forth in the Summary of Stock Grant. The Transferee
should consult with his or her tax advisor to determine the tax consequences of
acquiring the Transferred Shares and the advantages and disadvantages of filing
the Code Section 83(b) election. The Transferee acknowledges that it is his or
her sole responsibility, and not the Company's, to file a timely election under
Code Section 83(b), even if the Transferee requests the Company or its
representatives to make this filing on his or her behalf.

SECTION 7.        LEGENDS.

                  All certificates evidencing Transferred Shares shall bear the
following legends:

         "THE SHARES REPRESENTED HEREBY MAY NOT BE SOLD, ASSIGNED, TRANSFERRED,
         ENCUMBERED OR IN ANY MANNER DISPOSED OF, EXCEPT IN COMPLIANCE WITH THE
         TERMS OF A WRITTEN AGREEMENT BETWEEN THE COMPANY AND THE REGISTERED
         HOLDER OF THE SHARES (OR THE PREDECESSOR IN INTEREST TO THE SHARES).
         SUCH IMPOSES CERTAIN FORFEITURE CONDITIONS UPON TERMINATION OF SERVICE
         WITH THE COMPANY. THE SECRETARY OF THE COMPANY WILL UPON WRITTEN
         REQUEST FURNISH A COPY OF SUCH AGREEMENT TO THE HOLDER HEREOF WITHOUT
         CHARGE."

         "THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE
         SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR
         OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER
         SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE COMPANY AND ITS
         COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED."
<PAGE>

If required by the authorities of any state in connection with the issuance of
the Transferred Shares, the legend or legends required by such state authorities
shall also be endorsed on all such certificates.

SECTION 8.        NOTICE.

                  Any notice required by the terms of this Agreement shall be
given in writing. It shall be deemed effective upon (i) personal delivery, (ii)
deposit with the United States Postal Service, by registered or certified mail,
with postage and fees prepaid or (iii) deposit with Federal Express Corporation,
with shipping charges prepaid. Notice shall be addressed to the Company at its
principal executive office and to the Transferee at the address that he or she
most recently provided to the Company in accordance with this Section 9.

SECTION 9.        ENTIRE AGREEMENT.

                  The Summary of Stock Grant, this Agreement and the Plan
constitute the entire contract between the parties hereto with regard to the
subject matter hereof. They supersede any other agreements, representations or
understandings (whether oral or written and whether express or implied) which
relate to the subject matter hereof.

SECTION 10.       CHOICE OF LAW.

                  This Agreement shall be governed by, and construed in
accordance with, the laws of the State of Nevada, as such laws are applied to
contracts entered into and performed in such State.
<PAGE>

SECTION 11.       DEFINITIONS.

                  (a) "Agreement" shall mean this Stock Grant Agreement.

                  (b) "Board of Directors" shall mean the Board of Directors of
the Company, as constituted from time to time or, if a Committee has been
appointed, such Committee.

                  (c) "Cause" shall mean:

                           (i) An unauthorized use or disclosure by the
         Transferee of the Company's material non-public information or trade
         secrets;

                           (ii) A material breach by the Transferee of any
         consulting agreement between the Transferee and the Company;

                           (iii) A failure to perform satisfactorily the
         services and duties that Transferee is required to perform under its
         agreement with the Company;

                           (iv) The Transferee's conviction of, or plea of
         "guilty" or "no contest" to, a felony under the laws of the United
         States or any state thereof; or

                           (v) The Transferee's gross negligence or willful
         misconduct;

The foregoing, however, shall not be deemed an exclusive list of all acts or
omissions that the Company (or a Parent or Subsidiary) may consider as grounds
for the discharge of the Transferee without Cause.

                  (d) "Code" shall mean the Internal Revenue Code of 1986, as
amended.
<PAGE>

                  (e) "Committee" shall mean a committee of the Board of
Directors, as described in Section 2 of the Plan.

                  (f) "Company" shall mean Natural Gas Systems, Inc., a Nevada
corporation.

                  (g) "Consultant" shall mean a person who performs bona fide
services for the Company, a Parent or a Subsidiary as a consultant or advisor,
excluding Employees and Outside Directors.

                  (h) "Employee" shall mean any individual who is a common-law
employee of the Company, a Parent or a Subsidiary.

                  (i) "Fair Market Value" shall mean the fair market value of a
Share, as determined by the Board of Directors in accordance with the Plan.

                  (j) "Forfeiture Condition" shall mean the forfeiture condition
described in Section 2.

                  (k) "Immediate Family" shall mean any child, stepchild,
grandchild, parent, stepparent, grandparent, spouse, sibling, mother-in-law,
father-in-law, son-in-law, daughter-in-law, brother-in-law or sister-in-law and
shall include adoptive relationships.

                  (l) "Outside Director" shall mean a member of the Board of
Directors who is not an Employee.

                  (m) "Parent" shall mean any corporation (other than the
Company) in an unbroken chain of corporations ending with the Company, if each
of the corporations other than the Company owns stock possessing 50% or more of
the total combined voting power of all classes of stock in one of the other
corporations in such chain.

                  (n) "Plan" shall mean the Natural Gas Systems, Inc. 2004 Stock
Plan, as amended.
<PAGE>

                  (o) "Restricted Share" shall mean a Transferred Share that is
subject to the Forfeiture Condition.

                  (p) "Securities Act" shall mean the Securities Act of 1933, as
amended.

                  (q) "Service" shall mean service as an Employee, Outside
Director or Consultant.

                  (r) "Share" shall mean one share of Stock, as adjusted in
accordance with Section 14 of the Plan (if applicable).

                  (s) "Stock" shall mean the Common Stock of the Company, with a
par value of $0.001 per Share.

                  (t) "Subsequent Transferee" shall mean any person to whom the
Transferee has directly or indirectly transferred any Transferred Shares.

                  (u) "Subsidiary" shall mean any corporation (other than the
Company) in an unbroken chain or corporations beginning with the Company, if
each of the corporations other than the last corporation in the unbroken chain
owns stock possessing 50% or more of the total combined voting power of all
classes of stock in one of the other corporations in such chain.

                  (v) "Summary of Stock Grant" shall mean the document so
entitled to which this Agreement is attached.

                  (w) "Transferee" shall mean the individual named in the
Summary of Stock Grant.

                  (x) "Transfer Notice" shall mean the notice of a proposed
transfer of Transferred Shares described in Section 3.

                  (y) "Transferred Shares" shall mean the Shares acquired by the
Transferee pursuant to this Agreement.
<PAGE>

                                    Exhibit I

                    CERTIFICATE OF ACCREDITED INVESTOR STATUS

         Except as may be indicated by the undersigned below, the undersigned is
an "accredited investor," as that term is defined in Regulation D under the
Securities Act of 1933, as amended (the "Securities Act"). The undersigned has
checked the box below indicating the basis on which he is representing his
status as an "accredited investor":

|_|      a bank as defined in Section 3(a)(2) of the Securities Act, or any
         savings and loan association or other institution as defined in Section
         3(a)(5)(A) of the Securities Act whether acting in its individual or
         fiduciary capacity; a broker or dealer registered pursuant to Section
         15 of the Securities Exchange Act of 1934, as amended (the "Securities
         Exchange Act"); an insurance company as defined in Section 2(13) of the
         Securities Act; an investment company registered under the Investment
         Company Act of 1940 or a business development company as defined in
         Section 2(a)(48) of that Act; a small business investment company
         licensed by the U.S. Small Business Administration under Section 301(c)
         or (d) of the Small Business Investment Act of 1958; a plan established
         and maintained by a state, its political subdivisions, or any agency or
         instrumentality of a state or its political subdivisions, for the
         benefit of its employees, and such plan has total assets in excess of
         $5,000,000; an employee benefit plan within the meaning of the Employee
         Retirement Income Security Act of 1974, if the investment decision is
         made by a plan fiduciary, as defined in Section 3(21) of such Act,
         which is either a bank, savings and loan association, insurance
         company, or registered investment adviser, or if the employee benefit
         plan has total assets in excess of $5,000,000 or, if a self-directed
         plan, with investment decisions made solely by persons that are
         "accredited investors";

|_|      a private business development company as defined in Section 202(a)(22)
         of the Investment Advisers Act of 1940;

|_|      an organization described in Section 501(c)(3) of the Internal Revenue
         Code, corporation, Massachusetts or similar business trust, or
         partnership, not formed for the specific purpose of acquiring the
         securities offered, with total assets in excess of $5,000,000;
<PAGE>

|_|      a natural person whose individual net worth, or joint net worth with
         the undersigned's spouse, at the time of this purchase exceeds
         $1,000,000;

|_|      a natural person who had an individual income in excess of $200,000 in
         each of the two most recent years or joint income with the
         undersigned's spouse in excess of $300,000 in each of those years and
         has a reasonable expectation of reaching the same income level in the
         current year;

|_|      a trust with total assets in excess of $5,000,000, not formed for the
         specific purpose of acquiring the securities offered, whose purchase is
         directed by a person who has such knowledge and experience in financial
         and business matters that he is capable of evaluating the merits and
         risks of the prospective investment; or

|_|      an entity in which all of the equity holders are "accredited investors"
         by virtue of their meeting one or more of the above standards.

|_|      an individual who is a director or executive officer of Natural Gas
         Systems, Inc.

         IN WITNESS WHEREOF, the undersigned has executed this Certificate of
Accredited Investor Status effective as of __________________, 2005.

                                               _________________________________
                                               Name of Recipient

                                          By: ________________________
                                          Name: ______________________
                                          Title: _______________________

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