Document:

<PAGE>

                                                                    EXHIBIT 10.7

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                               Table of Contents
                               -----------------

MASTER SOFTWARE LICENSE AGREEMENT............................................  2
 SCHEDULE 1..................................................................  7
  ATTACHMENT 1...............................................................  9
  ATTACHMENT 2............................................................... 10
  ATTACHMENT 3............................................................... 11
    EXHIBIT A................................................................ 14
    EXHIBIT B................................................................ 16
    EXHIBIT C................................................................ 17
    EXHIBIT D................................................................ 18
  ATTACHMENT 4............................................................... 19
    EXHIBIT A................................................................ 21
    EXHIBIT B................................................................ 22
  ATTACHMENT 5............................................................... 23
  ATTACHMENT 6............................................................... 24
  ATTACHMENT 7............................................................... 25
  ATTACHMENT 8............................................................... 26
 SCHEDULE 2.................................................................. 27
  ATTACHMENT 1............................................................... 30
    EXHIBIT A................................................................ 31

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                                       1

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                       MASTER SOFTWARE LICENSE AGREEMENT

     THIS MASTER SOFTWARE LICENSE AGREEMENT ("Agreement") is made and entered
into as of (DATE), by and between Wireless Billing Systems, d.b.a. Primal
Billing Solutions, a California corporation ("PRIMAL") with its principal place
of business located at 18881 Von Karman Avenue, Irvine, California 92612, and
(CUSTOMER NAME) a company incorporated in (LOCATION INCORPORATED) ("Licensee")
with its principal place of business located at (ADDRESS).

     On the terms and conditions set forth herein, Licensee desires to obtain
from PRIMAL, and PRIMAL desires to grant to Licensee, a license to use a copy of
the computer programs listed on attachments and exhibits included in Schedule 1
attached hereto and in supplements to this Agreement ("Schedule" or
"Schedules"), executed from time-to-time by PRIMAL and Licensee ("Programs") and
a copy of the related documentation listed on the applicable Schedules and
Attachments ("Documentation"). The Programs and the Documentation collectively
are referred to as the "Software." This Agreement consists of this Master
Software License as well as all Schedules, Attachments, Exhibits, and Addenda to
this License currently or subsequently incorporated herein.

     NOW THEREFORE, in consideration of the mutual promises and covenants set
forth herein, PRIMAL and Licensee agree as follows:

1.   Grant of License
     ----------------

1.1  PRIMAL, or its third-party licensor(s), hereby grants to Licensee, and
Licensee hereby accepts from PRIMAL, or its third-party licensor(s), subject to
the terms and conditions of this Agreement, a personal, nontransferable,
nonexclusive license (the "License") (i) to use copies of each Program, in
object code in executable form only, solely at the location specified on the
Attachments in Schedule 1 or any supplements hereto with respect to such Program
(the "Designated Location") for Licensee's data processing needs and (ii) to use
copies of the Documentation solely for use in connection with the use of the
Programs authorized hereunder. Additional locations shall require additional
licenses and license fees. The License includes the right to copy the Software
as reasonably required by Licensee solely for its own internal data processing
needs at the Designated Location and for archival, back-up and disaster recovery
purposes.

1.2  Licensee agrees that it is an end user ("End User"), in that it is using
the Software solely for its own internal purposes, and that the License does not
include any right to use or authorize the use of the Software for any purpose
other than to fulfill the internal data processing needs of Licensee. Licensee
acknowledges and agrees that it has no right whatsoever to license the use,
reproduction or distribution of the Software by any person, firm or entity and
Licensee has no right to use any of the Software to provide data processing
services to any third party on a service bureau or time-sharing basis or
otherwise.

1.3  PRIMAL shall not provide Licensee with a copy of, and Licensee acquires no
right of any kind with respect to, any source code for any of the Programs.
Licensee agrees not to, and shall insure that its employees, contractors, or
agents do not, create or attempt to create, by de-compiling, disassembling,
reverse engineering or otherwise, the source code for any of the Programs.
Licensee acknowledges and agrees that it has no right whatsoever to modify the
Software or any portion thereof in any manner.

1.4  Licensee acknowledges and agrees that any third-party licensor shall be a
third-party beneficiary of all of the provisions of this License and shall be
entitled to enforce such terms.

2.   Term and Termination
     --------------------

2.1  The term ("Term") of this Agreement shall begin on the date 2 first stated
above, and continue so long as any Schedule hereto remains in effect hereunder
or until this Agreement is terminated pursuant to any provision hereof.

2.2  Except as otherwise provided for in the applicable Schedule attached
hereto, either party shall be entitled to terminate this Agreement (and pursue
all of its rights hereunder or at law or in equity) upon written notice to the
other party in the event of a breach by such other party of any of its
obligations hereunder and the failure of such other party to cure any such
breach within 30 days from receipt of written notice of such breach, unless such
breach by its nature cannot be cured, in which event the non-breaching party
shall be entitled to terminate this Agreement upon written notice to the other
party without any opportunity to cure.

2.3  This Agreement shall immediately terminate upon the occurrence of any of
the following events: a) filing by or against Licensee of a proceeding under any
bankruptcy or similar law, unless such proceeding is dismissed within 60 days
from the date of filing; (b) the making by Licensee of any assignment for the
benefit of creditors; (c) the filing by or against Licensee of a proceeding for
dissolution or liquidation, unless such proceeding is dismissed within 60 days
from the date of filing; (d) the appointment of or the application for the
appointment of a receiver, trustee or custodian for all or part of the assets of
Licensee, unless such appointment or application is revoked or dismissed within
60 days from the date of appointment or application whichever is earlier; (e)
the attempt by Licensee to make any adjustment, settlement, or extension of its
debts with its creditors generally; (f) the insolvency of Licensee; or (g) the
filing or recording of a notice of lien or the issuance or the obtaining of a
levy of execution upon or against a material portion of the assets of Licensee,
unless such lien or levy of execution is dissolved within 60 days from the date
of filing or recording.

2.4  Upon termination or expiration of this Agreement for any reason (including,
without limitation, discontinuation of use of the Software by Licensee), the
rights of Licensee to

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                                       2

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

possess or use the Software shall end, and Licensee shall immediately, at
PRIMAL's sole option, either deliver to PRIMAL or destroy the original Software
and all copies of the Software or any portion thereof in its possession or
control. Within 20 days following the date of such termination or expiration, an
officer of Licensee shall certify in writing to PRIMAL that the terms of this
Section 2.4 have been complied with.

2.5  Escrow provisions for the source code for the Programs are included in
Schedule 2 attached to this Agreement and incorporated herein.

3.   Licensee Fees/Payment
     ---------------------

3.1  The fees ("Fees") for the License granted hereunder are specified in the
applicable Schedule attached hereto as modified by any applicable supplement,
which fees shall be paid by Licensee as specified in such Schedule or
supplement. All payments shall be made in United States currency.

3.2  In addition to any other amounts due, Licensee shall pay to or reimburse
PRIMAL the amount of any sales, use, excise, property or other federal, state,
local or foreign taxes, duties, tariffs or other assessments (other than any tax
based solely on PRIMAL's net income) and related interest and penalties which
PRIMAL is at any time obligated to pay or collect in connection with or arising
out of the transactions contemplated by this Agreement.

3.3  Expenses. All out-of-pocket expenses incurred in installation, training,
     --------
ongoing maintenance and other support (telephone charges for ongoing support,
travel, etc.) will be billed to Licensee which amounts shall be promptly paid by
Licensee.

3.4  In the event PRIMAL does not receive any amounts from Licensee on or before
the date on which such amounts are due and payable, such outstanding amounts
shall bear interest at the rate of 1.5% per month, or the maximum rate permitted
by law, until payment is received. Amounts received by PRIMAL shall first be
credited against any unpaid interest, and accrual of such interest shall be in
addition to and without limitation of any and all additional rights or remedies
which PRIMAL may have hereunder or at law or in equity.

4.   Proprietary Rights
     ------------------

4.1  Licensee acknowledges that PRIMAL considers that the Software constitutes a
valuable proprietary product and trade secret of PRIMAL embodying substantial
creative efforts and confidential information. Licensee obtains pursuant to this
Agreement only the right to use copies of the Software on the terms and
conditions set forth herein and that no right, title or interest in or to the
Software or any copies thereof or any copyrights, trademarks or other
proprietary rights related to the Software are transferred to Licensee. Licensee
will use its best efforts and will take all reasonable steps to protect the
confidentiality of the Software, including but not limited to agreeing not to
sell, transfer, publish, disclose, display or distribute the Software except as
specifically authorized by this Agreement (collectively "Unauthorized Use or
Disclosure").

4.2  For purposes of this Agreement, confidential information ("Confidential
Information") shall mean with respect

to each party, all proprietary information of such party, including without
limitation, inventions, concepts, products, trade secrets, hardware, processes,
client lists, business and financial data, technical know-how, software programs
(including source code and object code) designated by such party in writing as
Confidential Information, or is otherwise subject to reasonable efforts to
maintain the secrecy thereof, provided Confidential Information shall not
include information that (i) was in the possession of the receiving party
without any obligation of confidence prior to disclosure of such information by
the other party, (ii) is or becomes publicly available through no fault of the
receiving party or (iii) was developed by the receiving party independent of the
activities contemplated by this Agreement. Each party agrees to protect and
treat as confidential the other party's Confidential Information and not to
disclose Confidential Information to third parties (other than to employees with
a "need to know" or independent contractors who have executed a standard form of
non-disclosure agreement with Licensee containing provisions at least as
protective as those set forth in this Section 4, or to use such Confidential
Information for any purposes whatsoever other than to perform the work
contemplated by this Agreement. Notwithstanding the foregoing, the receiving
party will advise employees having access to Confidential Information of the
existence of this Agreement and advise each of them of their obligation to
maintain the secrecy of the Confidential Information.

4.3  Licensee shall not remove, alter, cover or obfuscate any copyright notice,
trademark or other proprietary rights notice placed by PRIMAL in or on the
Software or any portion thereof and shall insure that all such notices are
reproduced on all copies of the Software or any portion thereof made by
Licensee. Licensee shall comply with reasonable directions given by PRIMAL from
time-to-time regarding the form and placement of copyright notices and other
proprietary rights notices on the Software or any portion thereof.

4.4  Licensee shall promptly notify PRIMAL of any known Unauthorized Use or
Disclosure of the Software and will cooperate with reasonable requests of PRIMAL
in any litigation brought by PRIMAL against third parties to protect its
proprietary rights, provided that PRIMAL shall indemnify Licensee against all
out-of-pocket expenses (including legal costs) incurred by Licensee at PRIMAL's
direction arising out of such cooperation. Licensee's compliance with the
provisions of this section shall not be construed as a waiver of any of PRIMAL's
rights hereunder.

4.5  Because of the unique and proprietary nature of the Software, it is
understood and agreed that PRIMAL's remedies at law for a breach by Licensee of
its obligations under this Section 4 will be inadequate and that PRIMAL shall,
in the event of any such breach, be entitled to equitable relief (including,
without limitation, injunctive relief and specific performance) without any
requirement to post a bond as a condition of such relief, in addition to all
other remedies provided under this Agreement or available to PRIMAL at law.

5.   Warranties
     ----------

5.1  PRIMAL warrants that (i) it owns the copyright in the Software or that it
has obtained a right to use and sub-license it (ii) the provision and
installation of the Software and the

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                                       3

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

Documentation does not contravene or breach in any way any contract or agreement
between PRIMAL and the third- party licensors or any other third-party
suppliers.

5.2  So long as Licensee maintains an in-force, paid-up annual maintenance
agreement ("Maintenance Agreement") with PRIMAL, PRIMAL warrants that the
Program shall perform substantially in accordance with the functional
performance specifications contained in the related Documentation. PRIMAL shall
(i) provide Licensee with a revised copy of the Program reflecting any
correction or modification which is incorporated by PRIMAL into its standard
version of such Program and shall provide Licensee with any new standard version
of the Program; (ii) use commercially reasonable efforts to correct any failures
of the latest version of the Program to perform substantially in accordance with
the functional performance specifications contained in the related
Documentation, provided PRIMAL is given written notice by Licensee of such
failures and such failures can be recreated by PRIMAL. PRIMAL DOES NOT WARRANT
THAT THE SOFTWARE WILL MEET LICENSEE'S REQUIREMENTS OR THAT OPERATION OF THE
SOFTWARE WILL BE UNINTERRUPTED OR ERROR FREE. EXCEPT AS PROVIDED IN THIS SECTION
5, PRIMAL DOES NOT MAKE BY VIRTUE OF THIS AGREEMENT, AND HEREBY EXPRESSLY
DISCLAIMS, ANY REPRESENTATION OR WARRANTY OF ANY KIND WITH RESPECT TO THE
SOFTWARE OR THE SERVICES OF PRIMAL, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

5.3  Any hardware ("Hardware") or third-party software ("Third-Party Software")
required or recommended for the use of the Software shall be, upon request of
Licensee, ordered on behalf of Licensee by PRIMAL and billed separately. PRIMAL,
upon payment in full of the purchase price for the Hardware and Third-Party
Software will assign to Licensee the title to the Hardware and license and any
manufacturer's warranties for any such Hardware and/or Third-Party Software.
EXCEPT AS OTHERWISE PROVIDED IN THIS AGREEMENT OR ON AN ATTACHED EXHIBIT OR
ATTACHMENT, PRIMAL MAKES NO WARRANTY, EXPRESS OR IMPLIED, AS TO ANY OTHER MATTER
WITH RESPECT TO THE HARDWARE OR THIRD-PARTY SOFTWARE WHATSOEVER, INCLUDING,
WITHOUT LIMITATION, ITS MERCHANTABILITY OR FITNESS OR CAPACITY OR DURABILITY FOR
ANY PARTICULAR PURPOSE, THE QUALITY OF THE MATERIAL OR WORKMANSHIP OF THE
HARDWARE OR THIRD-PARTY SOFTWARE OR CONFORMITY THEREOF TO THE PROVISIONS AND
SPECIFICATIONS OF ANY PURCHASE ORDER OR ORDERS RELATING THERETO. PRIMAL is not
responsible for any liability, claim, loss, damage or expense of any kind
(including strict liability in tort), caused directly or indirectly, by the
Hardware or Third-Party Software or any inadequacy thereof for any purpose, or
any deficiency or defect therein, or the use or maintenance thereof, or any
repairs, servicing or adjustments thereto; or any delay in providing or failure
to provide any part thereof, or any loss of business, or any damages whatsoever
and howsoever caused by the Hardware or Third-Party Software except for any
loss or damage caused by the gross negligence or willful misconduct of PRIMAL.
In no event is PRIMAL responsible for indirect, consequential, incidental or
special damages.

6.   Maintenance
     -----------

     The warranty obligations of PRIMAL under Section 5.2 above are contingent
upon Licensee maintaining a current, paid-up Maintenance Agreement with PRIMAL
under the terms specified in Attachment 3 to Schedule 1 of this Agreement or any
appropriate supplement to this Agreement or upon the terms of a separately
executed PRIMAL Master Maintenance Agreement. Any maintenance agreement or
Master Maintenance Agreement must be renewed on an annual basis at the then-
current rates which are to be prepaid by Licensee at the time of the execution
of this Agreement for the initial year or at the commencement of any subsequent
renewal period ("Maintenance Program").

7.   Programming Services
     --------------------

     Any modifications or revisions to the Software, including development of
custom software ("Custom Software"), performed by PRIMAL shall be subject to the
terms and conditions specified in the Custom Software Agreement included as
Attachment 4 to Schedule 1 of this Agreement or in a separate agreement. Either
software development agreement must be separately signed by an authorized
representative of both Licensee and PRIMAL. Such software modifications are not
within the scope of the Maintenance Program referenced above unless expressly
agreed to in writing by an authorized representative of PRIMAL.

8.   Exclusion of Consequential Damages;
     -----------------------------------
     Limitation of Liability
     -----------------------

8.1  PRIMAL SHALL NOT, UNDER ANY CIRCUMSTANCES, BE LIABLE TO LICENSEE FOR
CONSEQUENTIAL, INDIRECT, INCIDENTAL, SPECIAL OR EXEMPLARY DAMAGES ARISING OUT OF
OR RELATED TO THE SOFTWARE OR THE TRANSACTIONS CONTEMPLATED HEREIN, EVEN IF
PRIMAL IS APPRISED OF THE LIKELIHOOD OF SUCH DAMAGES OCCURRING. IN NO EVENT
SHALL PRIMAL'S LIABILITY TO LICENSEE HEREUNDER (WHETHER BASED ON AN ACTION OR
CLAIM IN CONTRACT, TORT OR OTHERWISE) ARISING OUT OF OR RELATED TO ANY PROGRAM
LICENSED HEREUNDER EXCEED THE TOTAL LICENSE FEE ACTUALLY PAID BY THE LICENSEE
FOR THE PROGRAM, PROGRAMS, OR SERVICES OUT OF WHICH SUCH LIABILITY AROSE.

8.2  Licensee acknowledges and agrees that PRIMAL has no control over the nature
of Licensee's business activities, its network switch(es), its other support
systems, or over the quality of telecommunications lines or the content of the
data transmitted, or any corruption, loss or damage to such data. Licensee
agrees to indemnify and hold PRIMAL harmless from any and all claims, suits or
damages by third parties arising out of the use of the Software except to the
extent such claims, suits or damages are covered under Section 10 hereof and
except to the extent PRIMAL's gross negligence or willful misconduct contributed
thereto.

9.   Security Precautions
     --------------------

     To prevent loss or damage to data as a result of malfunctions, errors or
defects of or in the Software, Licensee will regularly maintain and verify
integrity of back-up copies ("Back-ups") of all data and programs used in
connection with the Software. Licensee is solely responsible for any loss or
damage caused by a failure to maintain and verify proper daily and other Back-
ups.

10.  Proprietary Rights Indemnity
     ----------------------------

     Subject to Licensee's fulfillment of its

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                                       4

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

obligations under this Section 10 and the dollar limitations set forth in this
section, PRIMAL will hold, to the extent set forth in this section, Licensee
harmless, and at its own expense defend or settle any claim, suit, action, or
proceeding brought against Licensee to the extent that such claim, suit, action
or proceeding is based on a claim that the latest version of the Software or any
portion thereof infringes or constitutes wrongful use of a valid patent,
copyright or trade secret right protected under the laws of the United States,
any state in the United States, or laws of any foreign jurisdiction where PRIMAL
does business (a "Legally Protected Proprietary Right" or "LPPR"). Licensee
shall notify PRIMAL in writing of any such claim promptly after Licensee first
learns of it, and shall provide PRIMAL with such cooperation and assistance as
PRIMAL may reasonably request from time-to-time in connection with the defense
thereof. PRIMAL shall have sole control over any such suit or proceeding
(including choice of counsel and, without limitation, the right to settle on
behalf of Licensee on any terms PRIMAL deems desirable in the sole exercise of
its discretion). Subject to Licensee's fulfillment of its obligation under this
Section 10, PRIMAL shall pay all damages and costs finally awarded against
Licensee (or payable by Licensee pursuant to a settlement agreement) in
connection with such suit or proceeding, provided, however, that PRIMAL's
obligation to pay such damages and costs on behalf of Licensee shall not exceed
the price Licensee paid PRIMAL for such software. PRIMAL shall not enter into
any settlement agreement pursuant to this Section 10 in excess of such amount
without the prior written consent of Licensee. In the event that the use of the
Software or any portion thereof as permitted hereunder is held to infringe or
constitute wrongful use of any LPPR and Licensee's right to use such Software is
enjoined by a court of competent jurisdiction or if PRIMAL, in the reasonable
exercise of its discretion, instructs Licensee to cease using any such Software
in order to mitigate or lessen potential damages arising from a claimed
infringement or wrongful use of any LPPR, Licensee shall cease using such
Software. In the event Licensee ceases to use any such Software as provided in
this section (other than by reason of a temporary restraining order), PRIMAL
shall (i) replace such Software with equally suitable non-infringing software,
(ii) modify such Software so that the use of the Software by Licensee as
permitted hereunder ceases to be infringing or wrongful, (iii) procure for
Licensee the right to continue using such Software as permitted hereunder, or
(iv) after reasonable efforts under subsections (i), (ii) and (iii) of this
sentence, pay to Licensee the depreciated price paid by Licensee for such
Software based upon a five-year, straight-line depreciation schedule. OTHER THAN
AS EXPRESSLY STATED IN THIS SECTION 10, PRIMAL SHALL HAVE NO LIABILITY
WHATSOEVER TO LICENSEE FOR ANY LOSS OR DAMAGE (INCLUDING, WITHOUT LIMITATION,
FOR ANY CONSEQUENTIAL, INCIDENTAL, SPECIAL OR EXEMPLARY DAMAGES) ARISING OUT OF
OR RELATED TO ANY ALLEGATION OR DETERMINATION THAT LICENSEE'S USE OF THE
SOFTWARE AS PERMITTED HEREUNDER INFRINGES OR CONSTITUTES WRONGFUL USE OF ANY
LPPR. PRIMAL MAKES NO REPRESENTATION OR WARRANTY AND DISCLAIMS ALL LIABILITY OF
ANY TYPE WHATSOEVER ARISING OUT OF OR RELATING TO ANY ALLEGATION OR
DETERMINATION THAT LICENSEE'S USE OF THE SOFTWARE INFRINGES OR CONSTITUTES
WRONGFUL USE OF ANY COPYRIGHT, TRADE SECRET, PATENT OR OTHER PROPRIETARY RIGHT
OTHER THAN A LPPR.

11.  Assignment
     ----------

     Neither Licensee nor PRIMAL may assign or transfer this Agreement or any
interest herein (including rights and duties of performance) without the prior
written consent of the other party, which consent shall not be unreasonably
withheld. Licensee shall pay to PRIMAL a reasonable transfer fee should this
Agreement be assigned. Notwithstanding the foregoing, a party may, without the
consent of the other party, assign this Agreement and all of its rights and
obligations hereunder to any successor in interest which assumes all of the
assigning party's obligations hereunder in connection with a merger, a sale of
all or substantially all of such party's assets, or a sale of such party's
capital stock, so long as such successor in interest and any entity which
directly or indirectly controls such successor in interest is not a competitor
of the other party hereto.

12.  Notices
     -------

     Except as otherwise specified herein, all notices, requests, demands or
communications required or permitted hereunder shall be in writing, delivered
(i) personally, (ii) by facsimile (provided original is sent by other approved
means as set forth herein), (iii) sent by courier service of international
reputation (e.g., Federal Express) or (iv) sent by certified mail, postage
prepaid and return receipt requested (provided the origin and destination of the
notice are both within the United States), to the parties at the respective
addresses above (or at such other address as shall be given in writing by either
of the parties to the other in accordance with this Section 12). All notices,
requests, demands or communications shall be deemed effective upon receipt
(including facsimile).

13.  Excused Performances
     --------------------

     PRIMAL shall not be deemed to be in default of or to have breached any
provision of this Agreement as a result of any delay, failure in performance or
interruption of service, resulting directly or indirectly from acts of God, acts
of civil or military authorities, civil disturbances, wars, strikes or other
labor disputes, shortages of labor or materials, fires, transportation
contingencies, laws, regulations, acts or orders of any government or agency or
official thereof, other catastrophes, or any other occurrences beyond PRIMAL's
reasonable control.

14.  Miscellaneous Provisions
     ------------------------

14.1  Except as otherwise provided herein, no remedy made available to either
party hereto by any of the provisions of this Agreement is intended to be
exclusive of any other remedy, and each and every remedy shall be cumulative and
shall be in addition to every other remedy given hereunder or now or hereafter
existing at law or in equity or by statute or otherwise.

14.2  No waiver of any provision of this Agreement or any rights or obligations
of either party hereunder shall be effective, except pursuant to a written
instrument signed by the party or parties waiving compliance, and any such
waiver shall be effective only in the specific instance and for the specific
purpose stated in such writing.

14.3  This Agreement shall be construed and enforced in accordance with the laws
of the United States of America and the State of California which are applicable
to the construction and enforcement of contracts between parties resident in
California which are entered into and fully performed in California, regardless
of where this Agreement is

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                                       5

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

executed or performed or the residency of the parties hereto except that the
U.N. Convention on the International Sale of Goods shall not apply to this
Agreement. The Agreement shall be interpreted in accordance with its fair
meaning and not in favor or against either party. The operative Agreement shall
be the original English language Agreement executed by the parties, and
notwithstanding any translation that may be made by Licensee. In the event of a
conflict between the translation and the English language version, the English
language version shall take precedence over the translation and the terms and
conditions shall be construed in accordance with the English language Agreement.

14.4  This Agreement may be executed in one or more counterparts, each of which
shall be an original and all of which together shall constitute one and the same
instrument.

14.5  This Agreement shall inure to the benefit of and shall be binding upon the
parties hereto and their respective permitted successors and assigns.

14.6  Sections 2.4, 3, 4, 5.2, 8, 10 and 14 shall survive expiration or
termination of this Agreement for any reason.

14.7  In the event that any provision hereof is found invalid or unenforceable
pursuant to judicial decree or decision, the remainder of this Agreement shall
remain valid and enforceable according to its terms.

14.8  In the event of any litigation hereunder, such action shall be brought
into a state or federal court of competent jurisdiction located in Orange
County, California, and the prevailing party in the action as determined by the
court will be entitled to recover from the other party its court costs and
reasonable attorneys' fees.

14.9  This Agreement constitutes the entire understanding and agreement between
PRIMAL and Licensee with respect to the transactions contemplated herein and
supersedes any and all prior or contemporaneous oral or written communications
with respect to the subject matter hereof it is expressly understood and agreed
that no employee, agent or other representative of PRIMAL has any authority to
bind PRIMAL with regard to any statement, representation, warranty or other
expression unless the same is specifically set forth or incorporated by
reference herein. It is expressly understood and agreed that, there being no
expectation to the contrary between the parties hereto, no usage of trade or
other regular practice or method of dealing between the parties hereto shall be
used to modify, interpret, supplement or alter in any manner the express terms
of this Agreement or any part hereof. It is expressly agreed and understood that
this Agreement is the product of negotiations among the parties and that this
Agreement was mutually drafted by the parties. This Agreement shall not be
modified, amended or in any way altered except by an instrument in writing
signed by duly authorized representatives of the parties.

14.10 Each party agrees that neither it nor any entity under its control shall
directly or indirectly solicit for employment, employ, or retain as an
independent contractor or otherwise, any employee or former employee as herein
defined of the other party during the Term of this Agreement and for one (1)
year following its expiration, or for a period of three (3) years following the
commencement date of this Agreement, whichever is longer; except with such
party's written consent. Former employees shall include only those employees who
have terminated their employment with a party within a period of three (3)
months prior to the execution of this Agreement.

14.11 Licensee agrees to comply with United States export regulations.
Diversion of the Licensed Program(s) contrary to United States law is
prohibited.

14.12 PRIMAL shall have the right upon reasonable notice, to conduct and/or
direct an independent accounting firm to conduct, during normal business hours,
an audit of the appropriate records of Licensee to verify (i) the number of
copies of the Software in use, (ii) the computer systems on which such copies
are installed, (iii) the number of processors for which such copies are used,
and (iv) the number of billed accounts.

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the
date first written above.

<TABLE>
<CAPTION>
Wireless Billing Systems,                            Licensee:                    <CUSTOMER>
d.b.a. Primal Billing Solutions
<S>        <C>                                       <C>         <C>

By:                                                         By:
         ------------------------------------------            ----------------------------------------------
                          Signature                                               Signature

                         Bill Salway
         ------------------------------------------            ----------------------------------------------
                      Print or Type Name                                      Print or Type Name

Title:                    President                      Title:
         ------------------------------------------            ----------------------------------------------
</TABLE>

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                                       6

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                   SCHEDULE 1

                               Dated as of (DATE)
                                     to the
              Master Software License Agreement dated as of (DATE)
                                 by and between
Wireless Billing Systems, d.b.a. Primal Billing Solutions as Licensor ("PRIMAL")
                                      and
                      (CUSTOMER), as Licensee ("Licensee")

 This Schedule is issued pursuant to the Master Software License Agreement
 identified above. All of the terms and conditions of the Master Software
 License Agreement are incorporated herein and made a part hereof as if
 expressly set forth in this Schedule.

 1.   Term
      ----

      The term ("Initial Term") of this Schedule shall commence upon the date
 set forth above (the "Commencement Date") and shall continue for a period of
 five (5) years. Thereafter, so long as no event of default has occurred and is
 continuing, this Schedule may be renewed upon mutually agreeable terms and
 conditions.

 2.   Programs
      --------

      The Programs included under this Schedule are set forth in Attachment 1
 hereto.

 3.   Documentation
      -------------

      One (1) copy each of the available Documentation for the Programs licensed
 hereunder is included with the Software License fee. Additional copies may be
 obtained at PRIMAL's then-current rate.

 4.   Designated Location
      -------------------

      The system ("System") shall be located at Licensee's place of business as
 set forth in Attachment 1 hereto. Licensee agrees that the operation of the
 System shall be restricted to the location specified, however, Licensee shall
 be allowed to relocate the operation of the System to another business location
 that physically replaces the specified location on prior written notice to
 PRIMAL.

 5.   Professional Services
      ---------------------

      PRIMAL professional services ("Professional Services") includes Training,
 Consulting, Project Management, Server Hardware Configuration, Software
 Installation, Testing, Data Conversions and additional on-site activities. The
 Professional Services to be provided hereunder shall be as listed in Attachment
 2 hereto.

      If Licensee provides PRIMAL with less than ten (10) days notice of a
 change or cancellation of the dates set for training, support or any other
 planned on-site PRIMAL activity, Licensee may incur a penalty of $1,500 per
 PRIMAL person-day, up to a maximum of five (5) days, plus all expenses
 incurred.

      Normal workdays are not to exceed ten (10) hours. Any hours over ten (10)
 hours a day required by Licensee will be billed at a prorated portion of 150%
 of the daily rate for a weekday and 200% for any weekend day or PRIMAL-
 recognized holiday.

      PRIMAL and Licensee will mutually agree to a Professional Services
schedule. Professional Services beyond those defined in this Schedule will be at
PRIMAL's then-current rates.

6.    Third-Party Software and System Hardware
      ----------------------------------------

      Licensee agrees to purchase through PRIMAL the required Third-Party
Software and/or System Hardware as defined in Attachment 5 hereof for the price
set forth in Attachment 7. Third-Party Software and/or System Hardware prices
are net and exclude taxes, duties, freight and other like charges. If required
by the Third-Party Software and/or System Hardware Supplier(s), Licensee agrees
to execute the Third-Party Software and/or System Hardware License(s) and/or
Maintenance Agreement(s) defined in Attachment 6 hereof.

      If Licensee elects to purchase the System Hardware and/or Third-Party
Software directly, and not to purchase it through PRIMAL, Licensee acknowledges
and agrees that:

      (i)   System Hardware and/or Third-Party Software purchased by Licensee
shall meet the technical specifications provided by PRIMAL as set forth in
Attachment 5.

      (ii)  Licensee shall prepare the site, System Hardware and install the
Third-Party Software according to PRIMAL's specifications, and shall notify
PRIMAL that the site is so prepared and arrange for PRIMAL to arrive and install
the PRIMAL Software. Any delay from agreed plan, or once PRIMAL people arrive,
may result in additional charges.

      If Licensee elects to purchase the System Hardware and/or Third-Party
Software through PRIMAL, PRIMAL will:

      (i)   Load and configure the System Hardware with the required Third-Party
Software and PRIMAL Software System, create program and data directories, and
load test data in order to perform the Factory Acceptance Test (FAT).

      (ii)  Licensee shall prepare the site to meet specifications provided by
PRIMAL and shall notify PRIMAL that the site is so prepared and arrange for
PRIMAL to arrive and install the PRIMAL Software. Any delay from agreed plan or
once PRIMAL people arrive may result in additional charges.

     Shipping expenses are the responsibility of Licensee. PRIMAL shall not be
held responsible for transit time, customs clearance time or other potential
delays to the arrival of the System Hardware and/or Third-Party Software to the
installation site.

--------------------------------------------------------------------------------
                                       7

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

     If Licensee purchases System Hardware and/or Third-Party Software from
PRIMAL, all ownership and financial responsibility of purchased System Hardware
and/or Third-Party Software transfers to the Licensee from the time the System
Hardware and/or Third-Party Software leaves PRIMAL's facility.

7.   Maintenance
     -----------

     Maintenance support as specified in Attachment 3, "Maintenance Agreement"
hereto, is available for a Maintenance Support fee equal to the rate set forth
in said attachment and will be based on the then-current applicable Software
License fees for the Software licensed hereunder and any Custom Software fees.

8.   Custom Software
     ---------------

     PRIMAL custom software services will be performed under this Schedule as
set forth in Attachment 4, "Custom Software Agreement" hereto and will be based
on the applicable functional or technical specifications ("Functional Spec")
developed for such custom software. The fees for such custom software shall be
set forth in said attachment. Any changes outside the scope of or subsequent to
the Functional Spec will be billed at PRIMAL's then-current rates and evidenced
by a change order.

9.   License Fees and Payment Schedule
     ---------------------------------

     The License and other Fees payable hereunder are set forth in Attachment 7
hereto, are in U. S. dollars payable in the United States and exclude any taxes,
duties, freight, insurance, or other government charges, as well as any
reasonable out-of-pocket expenses as described in Section 3.3 of the Master
Software License Agreement, which will be billed separately and paid by Licensee
in accordance with the terms of Section 10.6.

     Except as expressly set forth in Attachment 8 to this Schedule, under the
special terms ("Special Terms") relating to the Monthly License and Maintenance
Fees, payments hereunder shall be subject to the following terms:

10.  Standard Payment Method and Schedule for Other Products and Services
     --------------------------------------------------------------------

10.1 Application Software License Fees. 100% due and payable upon receipt of
signed quotation or Purchase Order

10.2 Professional Services. 50% due upon receipt of signed quotation or Purchase
Order, balance due upon completion
of the applicable service.

10.3 Hardware/Equipment/Third-Party Software. 100% due and payable upon receipt
of signed quotation or Purchase Order.

10.4 Software Maintenance. 100% of the Base Maintenance Fees are due and
payable upon execution of the Maintenance Agreement (see Attachment 3) or a
separate Master Maintenance Agreement.

10.5 Custom Software. 50% due upon receipt of signed Functional Specifications
quotation for customization, balance due upon delivery (refer to Attachment 4).

10.6 Other Fees and Charges. Invoices due upon receipt.

     Incremental License fees are due and payable when the cumulative unit count
is exceeded. Licensee agrees to notify PRIMAL prior to exceeding such expanded
unit counts and to pay the incremental License fees corresponding to the new
level of use.

     Licensee acknowledges that for so long as payments for Software (including
but not limited to initial fees, upgrade fees, incremental License fees,
optional Software modules and/or custom software) remain due under this License,
an expiration date that renders the Software unusable will reside in the
Software and will be updated by PRIMAL as long as payments for said Software are
made in a timely manner by Licensee.

     Invoices under this Agreement may be submitted by facsimile and shall be
effective as of the date of receipt of such facsimile transmission.

11.  Additional Licensee Responsibilities
     ------------------------------------

     PRIMAL will provide Licensee, at no additional cost, with a new customer
start-up kit upon execution of this Schedule which shall contain start-up
information including, but not limited to, site preparation checklist, specific
recommendations as to other facility requirements and an PRIMAL contact list.
Licensee will provide a completed and signed-off copy of the checklist to PRIMAL
prior to installation.

12.  Special Terms
     -------------

     Any special terms applicable to this Schedule shall be set forth on
Attachment 8 hereto.

IN WITNESS WHEREOF, the parties hereto have executed this Schedule as of the
date first written above.

<TABLE>
<CAPTION>
Wireless Billing Systems,                            Licensee:                   <CUSTOMER>
d.b.a. Primal Billing Solutions
<S>        <C>                                       <C>         <C>

By:                                                         By:
         ------------------------------------------            ---------------------------------------------
                          Signature                                               Signature

                         Bill Salway
         ------------------------------------------            ---------------------------------------------
                      Print or Type Name                                     Print or Type Name

Title:                    President                      Title:
         ------------------------------------------            ---------------------------------------------
</TABLE>

--------------------------------------------------------------------------------
                                       8

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                  ATTACHMENT 1

                      To SCHEDULE NO. 1 dated as of (DATE)
                                     to the
              Master Software License Agreement dated as of (DATE)
                                 by and between
Wireless Billing Systems, d.b.a. Primal Billing Solutions as Licensor ("PRIMAL")
                                      and
                     (CUSTOMER), as Licensee ("Licensee").

                         Licensed Programs and Location

1.   Programs Licensed Hereunder
     ---------------------------

     (INSERT PROGRAMS)

2.   Third-Party Software and System Hardware
     ----------------------------------------

     (INSERT S/W AND H/W)

3.   Designated Location
     -------------------

     (LOCATION)

--------------------------------------------------------------------------------
                                       9

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                  ATTACHMENT 2

                      To SCHEDULE NO. 1 dated as of (DATE)
                                     to the
              Master Software License Agreement dated as of (DATE)
                                 by and between
Wireless Billing Systems, d.b.a. Primal Billing Solutions as Licensor ("PRIMAL")
                                      and
                     (CUSTOMER), as Licensee ("Licensee").

                      Professional Services to be Provided

1.   Training, Support and Consulting
     --------------------------------

     (LIST)

     Terms Relating to Training

     All training classes are limited to a total of six (6) Licensee employees
     per instructor per class unless otherwise stated in PRIMAL's training
     information. Licensee agrees that personnel attending Pre-Installation
     Training and Consulting will have the authority to make decisions about
     tables and parameters. If changes are made to tables and system parameters
     by Licensee during or after the Pre-Installation Training and Consulting,
     causing material changes to on-site training that delay completion of the
     training on schedule, Licensee will be charged $1,500 per day for each
     extra day (or partial day) caused by such delay for each on-site PRIMAL
     person.

2.   Project Management
     ------------------

     (LIST)

3.   Server Hardware Configuration, Software Installation,
     -----------------------------------------------------
     and Testing
     -----------

     (LIST)

--------------------------------------------------------------------------------
                                       10

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                  ATTACHMENT 3

                      To SCHEDULE NO. 1 dated as of (DATE)
                                     to the
              Master Software License Agreement dated as of (DATE)
                                 by and between
Wireless Billing Systems, d.b.a. Primal Billing Solutions as Licensor ("PRIMAL")
                                      and
                     (CUSTOMER), as Licensee ("Licensee").

                             Maintenance Agreement

This Maintenance Agreement ("Agreement") dated as of the (DAY) day of (MONTH),
(YEAR) ("Effective Date") is issued pursuant to the Master Software License
Agreement identified above. All of the terms and conditions of the Master
Software License Agreement are incorporated herein and made a part hereof as if
expressly set forth in this Agreement.

The parties hereto agree as follows:

1.0  Definitions
1.1  "Agreement Term" shall mean an initial period of one (1) year, commencing
on the Effective Date. Thereafter, the Agreement Term shall automatically renew
on a year-to-year basis unless terminated by either party in writing no later
than ninety (90) days prior to the expiration of any annual renewal period.
However, in no event shall the Agreement Term extend beyond the term of the
PRIMAL License.

1.2  "Basic Enhancements" shall mean changes or additions to the PRIMAL
Software, other than an Error Correction or Custom Software, which are
functional improvements to the PRIMAL Software. Basic Enhancements include only
those improvements that are generally made available at no additional cost to
PRIMAL customers.

1.3  "Major Release" shall mean integer releases, such as from release 1.0 to
2.0, which PRIMAL from time-to-time may offer to its customers at an additional
charge, and are not covered under this Agreement.

1.4  "Custom Software" shall mean any Licensee-funded software modifications
developed by PRIMAL under the provisions of the Primal License and listed under
Attachment 4 of Schedule 1 to the Primal License.

1.5  "PRIMAL License" shall mean the Master Software License referenced above
and to which this Agreement is an Attachment.

1.6  "PRIMAL Software" shall mean the (i) proprietary Software Program modules
listed on Attachment 1, and (ii) Custom Software listed on Attachment 4 to
Schedule 1 to the PRIMAL License.

1.7  "Error" shall mean any failure of the PRIMAL Software to substantially
conform to the specifications included in the Documentation delivered with the
PRIMAL Software.

1.8  "Error Correction" shall mean a software modification or addition that,
when made or added to the PRIMAL Software, establishes material conformity to
the specifications in the Documentation delivered with the PRIMAL Software.

1.9  "Third-Party Products" shall mean those third-party software programs in
object code format listed under Attachment 1 to Schedule 1 to the PRIMAL
License.

1.10 "Normal Support Hours" shall mean the hours between 6:00 a.m. and 5:00
p.m., Pacific Standard Time (PST), Monday through Friday, excluding regularly
scheduled holidays of PRIMAL as shown in Exhibit B of this Agreement.

1.11 "System Software" shall mean the (i) third-party products, and (ii) the
PRIMAL Software.

1.12 "PRIMAL Product Certified" shall mean a Licensee representative(s) who has
successfully completed the PRIMAL Product Certification Program. The Licensee is
required to maintain at least one (1) PRIMAL Product Certified Representative on
staff as part of this Agreement.

1.13 "Network Certified" shall mean any Information Services (IS) Engineer who
has successfully completed the appropriate Network Certification program for the
hardware platform used to execute the PRIMAL Software. The Licensee is required
to maintain at least one (1) Network Certified Representative on staff as part
of this Agreement.

1.14 "Software Service Levels" shall mean the level of Error Correction response
provided by PRIMAL as set forth in Exhibit D to this Agreement.

1.15 "Non-Standard Software Support" shall include, but is not limited to: (i)
calls to PRIMAL beyond the hours specified in Section 2.1.1, (ii) hardware or
network-related problems, or (iii) failures caused by improper use or care of
the PRIMAL Software application. Such services shall be billable at PRIMAL's
then- current rates.

2.0  Scope of Services

2.1  PRIMAL Software

2.1.1 Consultation. PRIMAL shall provide to Licensee's PRIMAL Product Certified
Representative telephone and/or electronic consultation on the PRIMAL Software
during Normal Support Hours. Such consultation shall include problem diagnosis,
troubleshooting and identification of Errors.

2.1.2 Error Correction. Licensee shall notify PRIMAL in writing of any Error,
specifying the reason the PRIMAL Software does not perform in conformity with
the applicable specifications and instructions how to recreate the Error
condition. Following completion of the Error Correction, PRIMAL shall provide
the Error Correction to Licensee through a procedure consisting

--------------------------------------------------------------------------------
                                       11

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

     of the transmission of sufficient programming data and operating
     instructions to remedy the Error. Such transmission may be in a form, which
     includes other changes that have been made by PRIMAL. Installation and
     incorporation of any transmission that includes the Error Correction is the
     responsibility of the Licensee. Licensee agrees to install and notify
     PRIMAL when the Error Correction has been installed.

     2.1.3    New Releases. PRIMAL may from time-to-time, distribute new program
     releases ("Release") containing Error Corrections and Enhancements. PRIMAL
     shall: (i) provide Licensee with notice concerning the content of such
     Releases; and (ii) provide Licensee with access to the new program Releases
     via FTP (File Transfer Protocol) or internet download during the Term of
     this Agreement.

2.2  Education. PRIMAL shall make available training, as indicated in Attachment
2 to Schedule 1 of the PRIMAL License, during the Term of this Agreement in
system administration and use of the System Software, including new Releases to
the PRIMAL Software. Such training shall be subject to PRIMAL's published class
schedules, then-current training rates, available space at its training center,
or availability of on-site trainers. This does not negate the Licensee's
responsibility in training themselves on the features and functionality of the
PRIMAL Software.

2.3  Complete Subscription. While highly recommended, PRIMAL Software
maintenance is optional to the Licensee. However, when said Licensee enters into
this Agreement for maintenance, any additional software that is licensed
relating to or dependent upon the main application, including Third-Party
Products, must also have support and/or maintenance agreements in force.

2.4  Current Version. It is the obligation of the Licensee to install and share
in the benefits of upgrades ("Upgrades") to the PRIMAL Software, as Releases
become available. PRIMAL will continue to support prior Releases for eighteen
(18) months from the first Ship Date of the Upgrade or most current Release. If
said Licensee chooses not to install the Upgrade or current Release, and the
prior Release becomes no longer supported by PRIMAL, PRIMAL will not be held
responsible to the Licensee for maintenance of the non-supported PRIMAL
Software.

2.5  Third-Party Products. PRIMAL does not provide support or maintenance except
for such software programs listed on Attachment 1 to Schedule 1 to the PRIMAL
License to which this Agreement is attached (and subject to any special
conditions which may apply). Licensee agrees to install and maintain versions of
the Third-Party Products that are compatible with the PRIMAL Software.

2.6  Custom Software. PRIMAL will provide Licensee quarterly maintenance for the
Custom Software set forth in Exhibit C, for the fees listed. Licensee and PRIMAL
agree that Custom Software may be added or deleted from this Exhibit C from
time-to-time while this Agreement is in force. All modifications to Exhibit C
will be in writing and signed by both parties.

2.7  PRIMAL User Group (PUG). Upon receipt of the fees and charges set forth in
Exhibit A of this Agreement, Licensee will be provided with membership in the
PRIMAL customer User Group for the remainder of the calendar year. PUG fees for
subsequent years will be the direct responsibility of the Licensee.

3.0  Fees and Charges
     ----------------

3.1  Licensee shall pay PRIMAL in advance of the Effective Date, or anniversary
date thereof, the annual charge for the maintenance and support services
described herein in accordance with the fees and charges set forth in Exhibit A
of this Agreement, PRIMAL reserves the right to adjust the rates for subsequent
Agreement Terms.

3.2  If Licensee allows this Agreement to lapse at the expiration of the
applicable Term thereof due to non-payment of the Annual Fee due hereunder,
Licensee may reinstate maintenance by first paying a Reinstatement Fee equal to
(i) 110% of the Maintenance Fee(s) payable during the lapsed period, plus (ii)
$2,000 in addition to the then-current Maintenance Fee for the new Term.

3.3  In addition to any other amounts due, Licensee shall pay to or reimburse
PRIMAL the amount of any sales, use, excise, property or other federal, state,
local or foreign taxes, duties, tariffs or other assessments (other than any tax
based solely on PRIMAL's net income) and related interest and penalties which
PRIMAL is at any time obligated to pay or collect in connection with or arising
out of the transactions contemplated by this Agreement. Licensee further
understands and agrees that all references to contract sums or prices in the
Agreement or the Exhibits hereto are to be made in United States currency.

3.4  Licensee shall be responsible for any charges for services not included
within the scope of this Agreement, including charges, such as, for PRIMAL
personnel performing training services at Licensee's site or other locations
specified by Licensee. Reasonable travel and living expenses incurred by PRIMAL
personnel in performing any services will be billed to the Licensee, as will the
cost of long-distance telephone charges to support international Licensee.

3.5  In the event PRIMAL does not receive any amounts from Licensee on or before
the date on which such amounts are due and payable, such outstanding amounts
shall bear interest at the maximum rate permitted by law until payment is
received. Amounts received by PRIMAL shall first be credited against any unpaid
interest, and accrual of such interest shall be in addition to and without
limitation of any and all additional rights or remedies which PRIMAL may have
hereunder or at law or in equity.

4.0  Proprietary Rights
     ------------------

4.1  To the extent that PRIMAL provides Licensee with any Error Corrections and
Basic Enhancements, Licensee shall promptly (i) install the Error Corrections
and Basic Enhancements in the form provided by PRIMAL; and (ii) use such Error
Corrections and Basic Enhancements only in connection with the PRIMAL Software
and in a manner consistent with the requirements of the PRIMAL Software Licensee
shall have the non-exclusive, non-transferable right to use Error Corrections
and Basic Enhancements for its internal business purposes only, and PRIMAL shall
retain all further rights. Licensee shall not duplicate (except for archival
purposes), reverse engineer, translate or adapt such PRIMAL Software.

4.2  The Error Corrections and Basic Enhancements are and shall remain the sole
property of PRIMAL, regardless of whether Licensee, its employees, or
contractors may have contributed to the conception of such work, joined in the
effort of its development, or paid PRIMAL for the use of the work product.

--------------------------------------------------------------------------------
                                       12

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

5.0  Warranty and Limitation of Liability
     ------------------------------------

5.1  During the period in which this Agreement remains in effect, PRIMAL
warrants that Basic Enhancements and Error Corrections shall conform to the
functional specifications as detailed in the Documentation that accompanies the
PRIMAL Software. Any failure by Licensee to promptly implement Basic
Enhancements and Error Corrections as supplied by PRIMAL will terminate the
warranty obligations of PRIMAL under this Agreement, unless Licensee has
obtained prior written authorization from PRIMAL.

5.2  All other warranty terms and limitations of liability are as stated in the
PRIMAL Software License Agreement to which this Agreement is attached.

6.0  Termination
     -----------

     This Agreement may be terminated as set forth in this Section 6.0.

6.1  Termination of License. This Agreement shall immediately terminate upon the
termination of the PRIMAL License.

6.2  Annual Term. This Agreement may be terminated for any subsequent Term by
either party in writing no later than ninety (90) days prior to the expiration
of any Term of this Agreement.

6.3  Non-Payment. This Agreement may be terminated by PRIMAL in the event the
CUSTOMER is more than thirty (30) days delinquent relating to payment in full of
the Fees due under this Agreement.

6.4  Failure to Perform. If either party defaults in the performance of any of
its obligations under this Agreement, and such default is not cured within
forty-five (45) days of written notification of such default from the non-
defaulting party, this Agreement may be immediately terminated by the non-
defaulting party upon written notice to the defaulting party.

7.0  Exhibits
     --------

     The attached Exhibits executed by initials of an authorized representative
of both parties are hereby incorporated by reference and made a part of this
Agreement.

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the
Effective Date.

<TABLE>
<CAPTION>
Wireless Billing Systems,                            Licensee:                   <CUSTOMER>
d.b.a. Primal Billing Solutions
<S>        <C>                                       <C>         <C>

By:                                                         By:
         ------------------------------------------            ---------------------------------------------
                          Signature                                               Signature

                         Bill Salway
         ------------------------------------------            ---------------------------------------------
                      Print or Type Name                                     Print or Type Name

Title:                    President                      Title:
         ------------------------------------------            ---------------------------------------------
</TABLE>

--------------------------------------------------------------------------------
                                       13

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                   EXHIBIT A

                                To ATTACHMENT 3

                               Software Products

     CUSTOMER NAME AND BILLING ADDRESS
      (CUSTOMER NAME)
      (LINE 1 ADDRESS)
      (LINE 2 ADDRESS)
      (CITY STATE ZIP)

     TELEPHONE SUPPORT CONTACTS

<TABLE>
<CAPTION>
NAME                                                               PHONE    EMAIL    PAGER    FAX
--------------------------------------------------------------------------------------------------
1. (NAME)                                                         (PHONE)  (EMAIL)  (PAGER)  (FAX)
--------------------------------------------------------------------------------------------------
2. (NAME)                                                         (PHONE)  (EMAIL)  (PAGER)  (FAX)
--------------------------------------------------------------------------------------------------

     PRIMAL SOFTWARE

MODULE                                                                    EFF. DATE  LICENSE (LIST)  MAINT. FEE
<S>                                                                       <C>        <C>             <C>
(MODULE)                                                                   (DATE)    (LICENSE)             (FEE)
----------------------------------------------------------------------------------------------------------------
(MODULE)                                                                   (DATE)    (LICENSE)             (FEE)
----------------------------------------------------------------------------------------------------------------
(MODULE)                                                                   (DATE)    (LICENSE)             (FEE)
----------------------------------------------------------------------------------------------------------------
(MODULE)                                                                   (DATE)    (LICENSE)             (FEE)
----------------------------------------------------------------------------------------------------------------
(MODULE)                                                                   (DATE)    (LICENSE)             (FEE)
----------------------------------------------------------------------------------------------------------------
(MODULE)                                                                   (DATE)    (LICENSE)             (FEE)
----------------------------------------------------------------------------------------------------------------
(MODULE)                                                                   (DATE)    (LICENSE)             (FEE)

TOTAL                                                                                                (TOTAL FEE)
                                                                                   -----------------------------
</TABLE>

                                   EQUIPMENT
     The Software supported and maintained by us, listed above, is licensed to
     operate at the location listed below:

<TABLE>
<CAPTION>
<S>                             <C>

LOCATION                          Address/City/State/Postal Code
-------------------------------------------------------------------

(INSERT LOCATION)
-------------------------------------------------------------------
CPU                             Brand/Serial Number(s)/Manufacturer
-------------------------------------------------------------------

(INSERT CPU)
-------------------------------------------------------------------
OS                              Manufacturer/Version/Release
-------------------------------------------------------------------

(OPERATING SYSTEM)
-------------------------------------------------------------------
</TABLE>

--------------------------------------------------------------------------------
                                       14

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

<TABLE>
<S>                            <C>

DATABASE                        Manufacturer/Version/Release
-------------------------------------------------------------------

(INSERT DATABASE)
-------------------------------------------------------------------
</TABLE>

     THIRD-PARTY PRODUCTS

<TABLE>
<CAPTION>
NAME                                                VERSION   LICENSE FEE. (List)  MAINTENANCE FEE
--------------------------------------------------------------------------------------------------
<S>                                                <C>        <C>                  <C>
(INSERT NAME)                                      (VERSION)    (LICENSE FEE)           (FEE)
--------------------------------------------------------------------------------------------------
(INSERT NAME)                                      (VERSION)    (LICENSE FEE)           (FEE)
--------------------------------------------------------------------------------------------------
(INSERT NAME)                                      (VERSION)    (LICENSE FEE)           (FEE)
--------------------------------------------------------------------------------------------------
(INSERT NAME)                                      (VERSION)    (LICENSE FEE)           (FEE)
--------------------------------------------------------------------------------------------------
</TABLE>

--------------------------------------------------------------------------------
                                       15

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                   EXHIBIT B

                                To ATTACHMENT 3

                               Scheduled Holidays

     The following are PRIMAL's company holidays:

       New Year's Day
       Memorial Day
       Independence Day
       Labor Day
       Thanksgiving
       Day after Thanksgiving
       Christmas Eve
       Christmas Day

--------------------------------------------------------------------------------
                                       16

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                   EXHIBIT C

                                To ATTACHMENT 3

                        Custom Software Acceptance Form

PRIMAL formally accepts and incorporates the Software listed below to be
included under this Agreement for the additional quarterly Fee of $ (AMOUNT),
payable in advance.

NAMED APPLICATION(S)

     (APPLICATION)
     (APPLICATION)
     (APPLICATION)
     (APPLICATION)
     (APPLICATION)
     (APPLICATION)
     (APPLICATION)
     (APPLICATION)

SPECIAL CONSIDERATIONS/LIMITATIONS

     (CONSIDERATION)
     (CONSIDERATION)
     (CONSIDERATION)
     (CONSIDERATION)
     (CONSIDERATION)
     (CONSIDERATION)
     (CONSIDERATION)
     (CONSIDERATION)
     (CONSIDERATION)
     (CONSIDERATION)

<TABLE>
<CAPTION>
Wireless Billing Systems,                            Licensee:                   <CUSTOMER>
d.b.a. Primal Billing Solutions
<S>        <C>                                       <C>         <C>

By:                                                         By:
         ------------------------------------------            ---------------------------------------------
                          Signature                                               Signature

                         Bill Salway
         ------------------------------------------            ---------------------------------------------
                      Print or Type Name                                     Print or Type Name

Title:                    President                      Title:
         ------------------------------------------            ---------------------------------------------
</TABLE>

--------------------------------------------------------------------------------
                                       17

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                   EXHIBIT D

                                To ATTACHMENT 3

                            Software Service Levels

Service Priority Levels:  PRIMAL will respond to service requests based on the
following Priority Levels:

<TABLE>
<CAPTION>
                                                                         INITIAL RESPONSE *TARGET TURN-AROUND    *TARGET PERMANENT
PRIORITY                                            DESCRIPTION                                                          FIX

-----------------------------------------------------------------------------------------------------------------------------------
<C>                        <S>                                                            <C>          <C>             <C>

     1                     PRIMAL Software is unusable and the Licensee cannot conduct     1 Hour      12 Hours         7 Days
                           business; failure of a major process (e.g., unable to run
                           month-end reports, provide real-time call processing, and/or
                           run PRIMAL Software).
     2                     Severe loss of functionality to a group of users or to a        2 Hours     24-72 Hours      12 Days
                           single user running a business-critical operation.
                           Inconvenient situation whereby the PRIMAL Software is          12 Hours     N/A              Next Release
     3                     usable, but does not provide a function in the most
                           convenient or expeditious manner.
     4                     Minor Software problem that does not prevent Licensee from     24 Hours     N/A              N/A
                           doing their work.
</TABLE>

SERVICE LEVEL PARAMETERS

     *The targets listed above are applicable during PRIMAL's normal support
hours. Priority 1 faults will be handled in a sequential order unless multiple
Priority 1 issues exist on a given day, then Licensee and PRIMAL must agree on
the appropriate Level 1 fault priorities daily. NOTE: While PRIMAL will respond
promptly to all requests, it is necessary to prioritize problems to meet all
customer needs.

     The priority of the request will primarily be determined by the direct
impact to the daily business operations of the client. The priority will be
determined and mutually agreed upon by the client and a PRIMAL CSA.

     When a fault is suspected, the Licensee must complete a PRIMAL Trouble
Report Form and contact Customer Support via telephone or e-mail. Work will not
commence until a complete description of the suspected fault or problem has been
received.

ESCALATION PROCEDURE

     When an issue has missed its resolution target, the escalation levels and
contacts are as described as follows:

     Standard Support Hours. These are the hours that a customer may call in to
their designated support center as identified in the Contact Procedure Section.
Standard Support Hours for the California-based office are 6:00 a.m. to 5:00
p.m. Pacific Standard Time (PST), Monday through Friday, excluding PRIMAL
holidays, for calls that are medium to low priority incidents as identified in
the Service Level Agreement.

     Emergency Support. High Priority calls are taken 24 hours a day, 7 days a
week, 365 days a year. See the Response Time Matrix above for the definition of
High Priority.

     NOTE: The customer may be charged PRIMAL's current hourly rates for
Emergency Support or for certain exclusions such as platform support, problems
with Third-Party Software, improper use of the Product and for support of a
Release that is more than two versions behind. Please review your Support
Contract for the details of exclusion.

CONTACT PROCEDURE

     Please use the following process if problems are encountered with a PRIMAL
System:

     Step 1: Contact the CSA First Level contact at the PRIMAL Office in Irvine,
California between 6:00 a.m. and 5:00 p.m. PST for Standard Support or for
Emergency Support outside of these hours. If the CSA cannot be reached within
one hour or has not responded satisfactorily, proceed to Step 2.

     Step 2: Contact the Client Support Lead. If no response within half-an-
hour, proceed to Step 3.

     Step 3: Contact the Client Services Manager. If no response within half-an-
hour, proceed to Step 4.

     Step 4: Contact the President of PRIMAL.

--------------------------------------------------------------------------------
                                       18

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                  ATTACHMENT 4

                      To SCHEDULE NO. 1 dated as of (DATE)
          To the Master Software License Agreement dated as of (DATE)
                                 by and between
Wireless Billing Systems, d.b.a. Primal Billing Solutions as Licensor ("PRIMAL")
                                      and
                      (CUSTOMER), as Licensee ("Licensee")

                           Custom Software Agreement

This Custom Software Agreement ("Agreement") dated as of the (DAY) day of the
(MONTH), (YEAR) ("Effective Date") is issued pursuant to the Master Software
License Agreement identified above. All of the terms and conditions of the
Master Software License Agreement are incorporated herein and made a part hereof
as if expressly set forth in this Agreement. This Agreement covers any Custom
Software to be developed by PRIMAL in connection with the License of Software
under the Master Software License Agreement referenced above.

The parties hereto agree as follows:

1.  Project Description and Scope
---------------------------------------------------

    The purpose of this Agreement is to define the terms and conditions for the
Custom Software Development Services ("Services") to be provided to Licensee by
PRIMAL. The project description is set forth in Exhibit A of this Agreement,
which delineates the agreed-upon scope of services ("Scope") to be performed
under this Agreement ("Project"). The Scope of services to be provided pursuant
to this Agreement may be changed from time-to-time on an as-needed basis. Any
change in Scope shall be evidenced by a written Addendum to this Agreement
executed by the parties to this Agreement. The parties agree to finalize the
functional specifications ("Functional Spec") governing the functional
performance of the Custom Software to be developed under this Agreement no later
than thirty (30) days following the Effective Date.

2.  Schedule
---------------------------------------------------

    The milestone dates ("Milestone Dates") for the Project are described in
Exhibit A.

    If PRIMAL is delayed at any time in the progress of its work on the Project
by any of the causes set forth below, the applicable Milestone Dates shall be
extended by a change order ("Change Order") for such reasonable time as agreed
upon by the parties of this Agreement. Reasons for extending applicable
Milestone Dates shall include: (i) an act or neglect of Licensee or of its
employees; (ii) an act or neglect of a separate contractor employed by the
Licensee; (iii) changes ordered in the Scope of the Project by Licensee; (iv)
other causes beyond PRIMAL's control not caused by PRIMAL's negligence,
recklessness, willfulness or intentional conduct. Monetary claims relating to
time shall be made in accordance with provisions of Section 7 of this Agreement
(Change Orders).

3.  Project Manager
    ---------------

    Licensee is to appoint a single Project Manager who has full and complete
authority to represent the Licensee, make final decisions on behalf of the
Licensee for all Specifications, project directions and approvals, and Change
Orders. Licensee's Project Manager shall be defined in Exhibit A.

4.  Non-Monetary Licensee Obligations
    ---------------------------------

    Licensee agrees to provide to PRIMAL all necessary information, Hardware,
Hardware mainte-nance, System Software, facilities and personnel deemed
necessary by PRIMAL for the delivery of Services as specified in this Agreement.
Licensee understands that if Licensee fails to provide these to PRIMAL, it may
result in additional costs and delay to the Project without the fault of
PRIMAL.

5.  Fees and Payment Terms
    ----------------------

    Services provided under this Agreement are to be provided according to the
rates shown on Exhibit B.

    Billings for the Services shall be generated by PRIMAL as such Services are
actually performed or completed. Billings for all appli-cable taxes shall be
gene-rated as they are due.

6.  Reimbursable Expenses
    ---------------------

    Licensee agrees to reimburse PRIMAL at cost for any reimbursable expenses
("Reimbursable Expenses') in the form of travel or other incidentals incurred
during the course of the Project within twenty (20) days following receipt of
vouchers, provided:

    A.  Licensee has given approval to incur Expenses as submitted by PRIMAL.

    B.  PRIMAL provides complete vouchers for all such Expenses, in the form of
actual receipts or other substantiation of each expenditure for all approved
Expenses.

    C.  PRIMAL follows Licensee's travel policy, a copy of which shall be
provided to PRIMAL by Licensee.

7.  Change Orders
    -------------

    Any change or modification to this Agreement, including the Scope of the
Project or the Services to be rovided by PRIMAL during the course of the
Agreement, shall

--------------------------------------------------------------------------------
                                       19

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

be evidenced by a written Change Order executed by both parties. Each Change
Order shall include a description of the services added or deleted, the amount
of the adjustment to Project Fees, and any impact upon the Project schedule. All
approved and executed Change Orders shall be evidenced as an Amendment and
Addendum to this Agreement and incorporated into the Scope of the Project.
Commencement by PRIMAL of work or Services prior to execution of a Change Order,
pursuant to a request by Licensee for modification of the Project or the Scope
of the Project, shall not constitute a waiver by PRIMAL for compensation for
such Services.

8.   Ownership
     ---------

     Full and exclusive rights and ownership in the Custom Software developed as
part of the Project(s) and in any and all related letters patent, trademarks,
copyrights, trade secrets, Confidential Information and any other proprietary
rights belong to PRIMAL. Licensee shall retain no right, ownership or title in
the Software developed as part of Services or in any related letters patent,
trademarks, copyrights, trade secrets, Confidential Information or any other
proprietary rights. The parties hereto agree that the Software developed as part
of Services and all such rights in their entirety belong to PRIMAL for whatever
use it desires.

9.   Benefit of Agreement
     --------------------

     It is the intent of the parties hereto that this Agreement is made solely
for the benefit of the undersigned and is not intended to benefit any third
parties who are not parties to this Agreement.

10.  Limitation of Liability
     -----------------------

     In no event shall PRIMAL's total liability arising out of the performance
of the Custom Software Development Services in the Project, whether in contract
or in tort, exceed $75,000 or the total agreed contract sum including Change
Orders, whichever is greater. No action arising from or related to the Project
or this Agreement, or the performance thereof, shall be commenced by either
party against the other more than two (2) years after the completion or
cessation of work under this Agreement.

     PRIMAL DISCLAIMS AND CLIENT WAIVES ANY AND ALL LIABILITY FOR ANY DAMAGES
WHATSOEVER, INCLUDING, WITHOUT LIMITATION, DIRECT DAMAGES, LOST PROFITS OR LOST
DATA OR OTHER SPECIAL, CONSEQUENTIAL OR INCIDENTAL DAMAGES ARISING OUT OF OR
RELATED TO THE USE OF OR THE INABILITY TO USE THE SOFTWARE DEVELOPED HEREUNDER,
EVEN IF PRIMAL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

11.  Authority to Execute
     --------------------

     Each of the undersigned represents that he or she is authorized to execute
this Agreement on behalf of the party described below.

BOTH PARTIES ACKNOWLEDGE that they have read this Agreement, understand it, and
agree to be bound by its terms and conditions.

Accepted by:

<TABLE>
<CAPTION>
Wireless Billing Systems,                            Licensee:                    <CUSTOMER>
d.b.a. Primal Billing Solutions
<S>        <C>                                       <C>         <C>

By:                                                         By:
         ------------------------------------------            ----------------------------------------------
                          Signature                                               Signature

                         Bill Salway
         ------------------------------------------            ----------------------------------------------
                      Print or Type Name                                      Print or Type Name

Title:                    President                      Title:
         ------------------------------------------            ----------------------------------------------
</TABLE>

--------------------------------------------------------------------------------
                                       20
<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                   EXHIBIT A

                     Of ADDENDUM NO. (NO.) to ATTACHMENT 4

                         Scope/Schedule/Specifications

--------------------------------------------------------------------------------
                                       21

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                   EXHIBIT B

                     Of ADDENDUM NO. (NO.) to ATTACHMENT 4

                             Fees and Payment Terms

--------------------------------------------------------------------------------
                                       22

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                  ATTACHMENT 5

                      To SCHEDULE NO. 1 dated as of (DATE)
          To the Master Software License Agreement dated as of (DATE)
                                 by and between
Wireless Billing Systems, d.b.a. Primal Billing Solutions as Licensor ("PRIMAL")
                                      and
                      (CUSTOMER), as Licensee ("Licensee")

                    Third-Party Software and System Hardware

--------------------------------------------------------------------------------
                                       23

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                  ATTACHMENT 6

                      To SCHEDULE NO. 1 dated as of (DATE)
          To the Master Software License Agreement dated as of (DATE)
                                 by and between
Wireless Billing Systems, d.b.a. Primal Billing Solutions as Licensor ("PRIMAL")
                                      and
                      (CUSTOMER), as Licensee ("Licensee")

                   Third-Party License/Maintenance Agreements

--------------------------------------------------------------------------------
                                       24

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                  ATTACHMENT 7

                      To SCHEDULE NO. 1 dated as of (DATE)
          To the Master Software License Agreement dated as of (DATE)
                                 by and between
Wireless Billing Systems, d.b.a. Primal Billing Solutions as Licensor ("PRIMAL")
                                      and
                      (CUSTOMER), as Licensee ("Licensee")

                         License and Other Fees Payable

Application Software License Fees                     (INSERT S/W LICENSE FEE)

Professional Services                                      (INSERT AMOUNT)
   1.  Total of (NO.) days including (NO.) days on-site training, (NO.) days
       on-site
       Installation, and (NO.) days off-site (PLATFORM) and (PLATFORM)
       installation
       and configuration (AMOUNT).

   2.

Hardware/Equipment/Third-Party Software                    (INSERT AMOUNT)

Software Maintenance                                       (INSERT AMOUNT)

Custom Software                                            (INSERT AMOUNT)

Discounts                                                  (INSERT AMOUNT)

--------------------------------------------------------------------------------
                                       25

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                  ATTACHMENT 8

                      To SCHEDULE NO. 1 dated as of (DATE)
          To the Master Software License Agreement dated as of (DATE)
                                 by and between
Wireless Billing Systems, d.b.a. Primal Billing Solutions as Licensor ("PRIMAL")
                                      and
                      (CUSTOMER), as Licensee ("Licensee")

                                 Special Terms

--------------------------------------------------------------------------------
                                       26

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                   SCHEDULE 2

                               Dated as of (DATE)
                                     to the
              Master Software License Agreement dated as of (DATE)
                                 by and between
Wireless Billing Systems, d.b.a. Primal Billing Solutions as Licensor ("PRIMAL")
                                      and
                      (CUSTOMER), as Licensee ("Licensee")

   This Schedule is issued pursuant to the Master Software License Agreement
identified above. All of the terms and conditions of the Master Software License
  Agreement are incorporated herein and made a part hereof as if expressly set
                            forth in this Schedule.

                                Escrow Agreement

   This Agreement is made as of (MONTH AND DAY), <YEAR> by and among Wireless
  Billing Systems, d.b.a. Primal Billing Solutions as Licensor ("PRIMAL"), and
  (CUSTOMER), as Licensee ("Licensee") and Fort Knox Escrow Services, Inc.,
               ("Escrow Agent") with reference to the following:

   A.  PRIMAL has granted a non-exclusive License to Licensee pursuant to the
 Master Software License Agreement between the parties, dated as of (MONTH AND
 DAY), (YEAR) ("License Agreement") to use and distribute the computer programs
              as listed in the License Agreement (the "Software").

 B.  Licensee has requested that PRIMAL deposit the source code to the Software
 in escrow pursuant to the terms of this Agreement, and PRIMAL has agreed to do
                                      so.

1.    Deposit
-------------

      Within thirty (30) days of delivery and acceptance of the Software, PRIMAL
shall deposit with Escrow Agent a copy of the source code form of the Software
("Source Code"), including all relevant explanations and other documentation of
the Source Code (collectively, "Documentation").

      PRIMAL agrees to deposit with Escrow Agent every six (6) months from the
date of this Agreement, a copy of the newest version to the Source Code or
Documentation encompassing all Corrections or Enhancements made to the Software
by Primal pursuant to the License Agreement or any software maintenance contract
between PRIMAL and Licensee and to which Licensee is entitled. The terms "Source
Code" and "Documentation" as used herein shall include all new Releases as
described in the preceding sentence.

      PRIMAL represents and warrants that the deposits here-under represent a
true and correct copy of the Source Code for the Software. In depositing new
Releases of the Source Cod or Documentation with Escrow Agent, PRIMAL may remove
from Escrow Agent's possession any material which PRIMAL deems to be superseded
by the new Releases so deposited.

PRIMAL will retain copies of all material deposited with Escrow Agent.

2.  Term.  This Agreement shall remain in effect during the Term of the Master
Software License Agreement and the Software Maintenance Agreement between PRIMAL
and Licensee, and for so long as an End User under Licensee is entitled to the
continued use of the Software. Upon receipt of written notice from PRIMAL that
either of such Agreements has been terminated, Escrow agent shall promptly
notify Licensee in writing and provide PRIMAL with a copy of such notice. If
Licensee does not deliver a written objection to such termination within thirty
(30) days of delivery of Escrow Agent's notice, this Agreement shall be deemed
terminated and the Source Code and Documentation shall be promptly returned to
PRIMAL .

    If Licensee delivers a written objection to the termination within the time
period specified above, Escrow Agent shall so notify PRIMAL and shall not
deliver the Source Code or Documentation to Licensee until it receives
satisfactory evidence of an agreement between PRIMAL and Licensee for such
delivery, or certified copy of a court order directing it to do so.

    This Agreement shall also terminate if Licensee fails to pay the Fee due
Primal or Escrow Agent under Section 4 and such failure continues for more than
thirty (30) days after written demand for payment has been received by Licensee
from either Escrow Agent or PRIMAL.

    Finally, this Agreement shall terminate upon delivery of the Source Code and
Documentation to Licensee in accordance with the terms hereof.

3.  Delivery to Licensee.
    ---------------------

    Upon receipt of written notice by Licensee that PRIMAL has, without cause on
Licensee's part, interrupted its business or been acquired by another entity,
and failed to furnish Licensee with maintenance support to the extent required
under the License Agreement and any applicable Maintenance Agreement between the
parties, Escrow Agent shall promptly send a copy of such notice to PRIMAL.

    If Escrow Agent does not receive a written notice

--------------------------------------------------------------------------------
                                       27

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

from PRIMAL within twenty (20) days of delivery of License notice, disputing the
facts in Licensee's notice, Escrow Agent shall deliver the Source Code and
Documentation in its possession to Licensee.

     Licensee will be entitled to use the Source Code and Documentation in the
same manner as it is entitled to use the Software under the License Agreement,
except that neither Licensee nor its Affiliates shall be entitled to further
distribute the Software. All restrictions on use (except that Licensee shall be
permitted to use the Source Code as necessary for the limited purpose of
maintaining and supporting its End Users) of the Software under the Master
Software License Agreement shall apply to use of the Source Code and
Documentation, and all Confidentiality obligations under the License Agreement
shall apply to Licensee's use and possession of the Source Code and
Documentation.

     If PRIMAL delivers a written notice to Escrow Agent within the foregoing
20-business-day period disputing Licensee's claim, Escrow Agent shall not
deliver the Source Code or Documentation to Licensee until it receives
satisfactory evidence of an agreement between PRIMAL and Licensee for such
delivery, or a certified copy of a court order directing it to do so.

4.   Compensation
     ------------

     As compensation for the services to be performed by Escrow Agent and PRIMAL
hereunder, Licensee shall pay PRIMAL an Initial Fee of  $2,500 upon execution of
this Agreement, and an Annual Fee of $1,000 in advance on each anniversary date
of this Agreement during its Term. In addition, Licensee shall pay Escrow Agent
an Initial Fee of $850 upon execution of this Agreement and an Annual Fee of
$900 ($1,000 international) in advance on each Anniversary Date of this
Agreement during its Term (in accordance with the terms on Attachment 1).
Licensee is not entitled to a partial or full refund of any fees paid if this
Agreement is terminated other than on an Anniversary Date, unless Escrow Agent
resigns.

5.   Resignation.
     -----------

     Escrow Agent may resign as such at any time upon 30 days prior written
notice to PRIMAL and Licensee. Upon resignation, Escrow Agent shall deliver the
Source Code and Documentation to such successor as PRIMAL and Licensee
designate.

     If PRIMAL and Licensee do not designate a successor Escrow Agent in such
30-day period, Escrow Agent shall deliver the Source Code and Documentation to
PRIMAL, who shall hold such Source Code and Documentation in off-site storage
until such time as PRIMAL and Licensee agree on a successor Escrow Agent. PRIMAL
and Licensee agree to cooperate in good faith in the appointment of a successor
Escrow Agent.

     If Escrow Agent resigns, other than on an Anniversary Date, it shall
refund a portion of the last Escrow Fee paid by Licensee. Such refund shall be
pro-rated based on the number of months (including partial ones) out of twelve
that Escrow Agent served following payment of the last Escrow Fee.

6.   Confidentiality
     ---------------

     Except as provided in this Agreement, Escrow Agent shall not develop,
disclose or otherwise make available to any third party whatsoever, or make any
use whatsoever, of the Source Code or Documentation, without the prior written
consent of PRIMAL.

7.   Storage Environment
     -------------------

     Escrow Agent shall take reasonable measures to insure that the Source Code
tapes and Documentation are protected from theft and from damage and
deterioration, including damage caused by fire, water or chemicals.

8.   Liability
     ---------

     Escrow Agent shall not assume any liability or responsibility for any
transaction between Licensee and PRIMAL, other than the performance of its
obligations hereunder.

9.   Remedies
     --------

     Except for actual fraud, gross negligence or intentional misconduct, Escrow
Agent shall not be liable to Licensee or to PRIMAL for any act, or failure to
act, by Escrow Agent in connection with this Agreement. Escrow Agent will not be
liable for special, indirect, incidental or consequential damages hereunder.

10.  Notices
     -------

     All notices, instructions or other communications hereunder shall be in
writing and shall be deemed delivered on the date of delivery, if hand-
delivered, or two days after mailing, if sent by courier of international
reputation (e.g., DHL or Federal Express) prepaid and addressed as follows:

     If to PRIMAL:
     PRIMAL Billing Solutions
     18881 Von Karman Avenue, Suite 450
     Irvine, CA 92612
     Attn: President/General Manager

     If to Escrow Agent:
     Fort Knox Escrow Services, Inc.
     2100 Norcross Parkway, Suite 150
     Norcross, GA. 30071
     Attn: Vice President

     If to Licensee:
     (COMPANY)
     (STREET ADDRESS)
     (CITY, STATE, ZIP)
     (ATTN:)

     Any party can change its address for receipt of notices by notifying the
others in the manner set forth above.

11.  Miscellaneous
     -------------

11.1 Governing Law
     -------------

     This Agreement shall be governed by and construed in accordance with the
laws of California, excluding any laws

--------------------------------------------------------------------------------
                                       28
<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

which might cause the laws of any other jurisdiction to apply, and the parties
agree to jurisdiction and venue to be in the applicable state or federal court
sitting in Santa Ana, California.

11.2 Attorney's Fees
     ---------------

     The prevailing party in any dispute concerning the subject matter hereof
shall be entitled to recover from the losing party its costs and reasonable
attorney's fees.

11.3 Counterparts
---- ------------

     This Agreement may be executed in multiple counterparts each of which shall
be deemed an original and all of which together will constitute a single
Agreement, even if the parties execute different counterpart signature pages.

11.4 Successors and Assigns
     ----------------------

     This Agreement shall be binding on and inure to the benefit of the parties
hereto and their respective successors and assigns. Notwithstanding the
foregoing, Escrow Agent may not assign its duties hereunder without the prior
written consent of PRIMAL and Licensee.

11.5 Waiver
     ------

     No waiver of any provision of this Agreement or any rights or obligations
of the parties hereunder shall be binding unless made in writing by the party or
parties waiving compliance. Any such waiver shall be effective only for the
specific instance and for the specific purpose stated in such writing.

10.6 Constructions
     -------------

     This Agreement shall be interpreted in accordance with its fair and
reasonable meaning and not more strictly against one party than the others.

10.7 Invalidity
     ----------

     In the event any provision hereof is found invalid or unenforceable, the
remainder of this Agreement shall remain valid and enforceable according to its
terms.

10.8 Indemnity
     ---------

     Primal and Licensee shall, jointly and severally indemnify and hold
harmless Escrow Agent and each of its directors, officers, agents, employees and
stockholders ("Escrow Agent Indemnities") absolutely and forever, from and
against any and all claims, actions, damages, suits, liabilities, obligations,
costs, fees, charges, and any other expenses whatsoever, including reasonable
attorneys' fees and costs, that may be asserted against any Escrow Agent
Indemnity in connection with this Agreement or the performance of Escrow Agent
or any Escrow Agent Indemnity hereunder.

10.9 Disputes and Inter-Pleader
     --------------------------

     In the event of any dispute between any of the Escrow Agent, Licensee,
and/or PRIMAL relating to the delivery of the deposit materials by Escrow Agent
or to any other matter arising out of this Agreement, Escrow Agent may submit
the matter to any court of competent jurisdiction in an inter-pleader or similar
action. Any and all reasonable attorneys' fees and costs, shall be borne 50% by
each of Licensee and PRIMAL.

     Escrow Agent shall perform any acts ordered by any court of competent
jurisdiction, without any liability or obligation to any party hereunder by
reason of such act.
<TABLE>
<CAPTION>

<S>      <C>
10.10    Survival
-------  --------
</TABLE>
     Sections 8, 9, and 11 shall survive any termination of this Agreement.
<TABLE>
<CAPTION>
Wireless Billing Systems,                            Licensee:                    <CUSTOMER>
d.b.a. Primal Billing Solutions
<S>        <C>                                       <C>         <C>

By:                                                         By:
         ------------------------------------------            -----------------------------------------------
                          Signature                                                Signature

                         Bill Salway
         ------------------------------------------            -----------------------------------------------
                      Print or Type Name                                      Print or Type Name

Title:                    President                      Title:
         ------------------------------------------            -----------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
"Escrow Agent,"
Fort Knox Escrow Services, Inc.
<S>        <C>

By:
         ------------------------------------------
                          Signature

         ------------------------------------------
                      Print or Type Name

Title:
         ------------------------------------------
</TABLE>

--------------------------------------------------------------------------------
                                       29

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                  ATTACHMENT 1

                      To SCHEDULE NO. 2 dated as of (DATE)
                                     to the
              Master Software License Agreement dated as of (DATE)
                                 by and between
Wireless Billing Systems, d.b.a. Primal Billing Solutions as Licensor ("PRIMAL")
                                      and
                     (CUSTOMER), as Licensee ("Licensee").

                              Escrow Service Fees

ESCROW AGENT FEES

<TABLE>
<CAPTION>
INITIAL ESCROW FEES TO BE PAID SHALL BE AS FOLLOWS:
-----------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                         <C>
Initialization Fee (one time only)                                                          $850 ($765 for current customers)
Annual Maintenance/Storage Fee                                                              $900 per  product License
                                                                                            $1,000 per international License
Product Updates                                                                             $150 (for each update above 2 per year)
Additional Storage Space (above 1 cubic foot)                                               $150 per cubic foot
</TABLE>

<TABLE>
<CAPTION>
FEES TO BE PAID EACH YEAR THEREAFTER SHALL BE AS FOLLOWS:
-----------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                         <C>
Maintenance/Storage Fee                                                                     $900 per product License
                                                                                            $1,000 per international License
Product Updates (due upon receipt of release for source code)                               $150 (for each update above 2 per year)
At Producer's Request                                                                       $100
At Licensee's Request                                                                       $500
</TABLE>

PRIMAL FEES

<TABLE>
<CAPTION>
ANNUAL FEES PAYABLE TO PRIMAL SHALL BE AS FOLLOWS:
<S>                                                                                         <C>
---------------------------------------------------------------------------------------------------------------------------------
Initialization Fee (one time only)                                                          $2,500 (waived for current customers)
Normal Annual Update                                                                        $1,000
</TABLE>

Fees shall be subject to current pricing, provided such prices do not increase
more than 10% per annum.

--------------------------------------------------------------------------------
                                       30

<PAGE>

                                                                          PRIMAL
--------------------------------------------------------------------------------
                                                       Revised February 15, 2000

                                   EXHIBIT A

                    Of Attachment 1 to the Escrow Agreement

                         Licensed Programs and Versions

TYPE OF DEPOSIT

<TABLE>
<CAPTION>
            (AMOUNT)                            Initial Deposit
--------------------------------
            (AMOUNT)              Update Deposit (to Replace Current Deposits)
--------------------------------
            (AMOUNT)              Other (Please Describe):
--------------------------------
<S>                               <C>

                                  (DESCRIPTION)
</TABLE>

ITEMS DEPOSITED

<TABLE>
<CAPTION>
PRODUCT                                                 VERSION #  QUANTITY  MEDIA TYPE   DESCRIPTION
------------------------------------------------------------------------------------------------------
<S>                                                     <C>        <C>       <C>         <C>
(PRODUCT)                                               (VERSION)   (QTY)      (TYPE)    (DESCRIPTION)
------------------------------------------------------------------------------------------------------
(PRODUCT)                                               (VERSION)   (QTY)      (TYPE)    (DESCRIPTION)
------------------------------------------------------------------------------------------------------
(PRODUCT)                                               (VERSION)   (QTY)      (TYPE)    (DESCRIPTION)
------------------------------------------------------------------------------------------------------
(PRODUCT)                                               (VERSION)   (QTY)      (TYPE)    (DESCRIPTION)
------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
Prepared and Confirmed By:
<S>                          <C>

Name:                                                    (NAME)
                           ----------------------------------------------------------------
                                                   Print or Type Name

Title:                                                  (TITLE)
                           ----------------------------------------------------------------
                                                  Print or Type Title

Signed By:
                           ----------------------------------------------------------------
                                                       Signature

Date:
                           ----------------------------------------------------------------
</TABLE>

--------------------------------------------------------------------------------
                                       31<PAGE>

                           PURCHASE AND SALE AGREEMENT

         This Purchase and Sale Agreement (this "Agreement") dated as of the 4th
day of August 2000, is between CASTLE OFFSHORE, L.L.C., a limited liability
company organized and existing under the laws of Louisiana ("CASTLE") and BWAB
LIMITED LIABILITY COMPANY, a limited liability company organized and existing
under the laws of Colorado ("BWAB") (collectively, the "Sellers") and DELTA
PETROLEUM CORPORATION, a corporation organized and existing under the laws of
Colorado ("Buyer"). Sellers and Buyer are referred to herein individually as a
"Party" and collectively as the "Parties."

         In consideration of the mutual promises contained herein, the benefits
to be derived by each Party hereunder and other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, Buyer and Sellers
agree as follows:

                                    ARTICLE 1
                                PURCHASE AND SALE

         1.1 Purchase and Sale. Subject to the terms and conditions of this
Agreement, Sellers agree to sell and convey and Buyer agrees to purchase and pay
for all of Sellers' right, title and interest in and to the Interests. The
Parties recognize that as between the Sellers, Castle owns and will sell and
convey seventy-five percent (75%) of the Interests and BWAB owns and will sell
and convey twenty-five percent (25%) of the Interests.

         1.2 Interests. All of the following shall be referred to in this
Agreement collectively as the "Interests" and individually as an "Interest":

             (a) The oil, gas and mineral leases described on Exhibit "A"
attached hereto (collectively, the "Leases"), including, without limitation,
working interests, overriding royalty interests, royalty interests and any other
interests of a similar nature affecting the lands covered by the Leases
(collectively, the "Lands").

             (b) The oil and gas wells described on Exhibit "A" (individually, a
"Well," and collectively, the "Wells"), together with all oil, natural gas,
casinghead gas, drip gasoline, natural gas liquids, condensate and other
minerals produced from such Wells.

             (c) All unitization, communitization, pooling, agreements, working
interest units created by operating agreements, partnership agreements and
orders covering the Leases and Lands, or any portion thereof, and the units and
pooled or communitized areas created thereby (collectively, the "Units").

                                       1

<PAGE>

             (d) The tangible personal property, tools, machinery, materials,
pipelines, plants, gathering systems, equipment, platforms and facilities,
fixtures and improvements, which are incident or attributable to or underlie the
Leases, Lands, Wells or Units with the production, transportation, treatment,
sale or disposal of hydrocarbons or water produced therefrom or attributable
thereto, (collectively, the "Equipment").

             (e) The licenses, permits, contracts, agreements and other
instruments owned by Sellers (other than bonds posted by Sellers) which concern
and relate to any of the Leases, Lands, Wells, Units and/or Equipment, INSOFAR
AND ONLY INSOFAR as same concern or relate to the Leases, Lands, Wells, Units
and/or Equipment, or the operation thereof; including, without limitation, oil,
gas and condensate purchase and sale contracts; permits; rights-of-way;
easements; licenses; servitudes; estates; surface leases; farmin and farmout
agreements; division orders and transfer orders; bottomhole agreements; dry hole
agreements; area-of-mutual interest agreements; salt water disposal agreements;
acreage contribution agreements; operating agreements; balancing agreements and
unit agreements; pooling agreements; pooling orders; communitization agreements;
processing, gathering, compression and transportation agreements; facilities or
equipment leases relating thereto or used or held for use in connection with the
ownership or operation thereof or with the production, treatment, sale or
disposal of hydrocarbons; and all other contracts and agreements related to the
Leases, Lands, Wells and/or Equipment.

             (f) Subject to Section 1.3 below, originals or copies of all
computer tapes and discs, files, records, information or data relating to the
Interests in the possession of Sellers, including, without limitation, title
records (including abstracts of title, title opinions, certificate of title and
title curative documents), accounting records and files, contracts,
correspondence, production records, electric logs, core data, pressure data,
decline curves, graphical production curves, drilling reports, well completion
reports, drill stem test charts and reports, regulatory reports, and all related
materials, INSOFAR AND ONLY INSOFAR as the foregoing items constitute materials
that may be lawfully conveyed to Buyer (i.e., the materials are not subject to a
proprietary agreement precluding their transfer to Buyer), and, to the extent
transferable, all other contract rights, intangible rights (excluding Sellers'
trademarks and service marks), inchoate rights, choses in action, rights under
warranties made by prior owners, manufacturers, vendors or other third parties,
and rights accruing under applicable statutes of limitation or prescription,
attributable to the Interests.

             (g) All payments, and all rights to receive payments, with respect
to the ownership of the production of hydrocarbons from or the conduct of
operations on the Interests accruing after the Effective Time.

         1.3 Reserved Interests. Notwithstanding any provision of this Agreement
to the contrary, Sellers reserve and retain (i) Sellers' corporate, financial,
tax and legal records and its other business records; (ii) cash, bank accounts,
letters of credit, travel letter accounts and prepaid insurance; (iii) the

                                       2

<PAGE>

management information systems and other intellectual property rights of Sellers
used by Sellers in the management and administration of its business; (iv) all
claims that Sellers may have under any policy of insurance, indemnity or bond
maintained by Sellers other than claims relating to property damage or casualty
loss affecting the Interests occurring between the Effective Time and Closing
(which claims shall be included in the Interests); (v) all accounts receivable,
trade credits or notes receivable accrued before the Effective Time; (vi) any
files or records that Sellers are contractually or otherwise obligated not to
disclose to Buyer; (vii) all claims and causes of action arising from acts,
omissions or events, or damage or destruction of property occurring prior to the
Effective Time; (viii) engineering studies or reserve reports relating to the
Interests; (ix) all interests and rights not included in the definition of the
Interests (the "Reserved Interests").

         1.4 Effective Time. The purchase and sale of the Interests shall be
effective as of July 1, 2000, at 7:00 a.m., central standard time (herein called
the "Effective Time").

         1.5 Ownership of the Interests. Subject to Section 13.1 and the other
provisions of this Agreement, should Closing occur, Sellers shall be entitled to
all of the rights of ownership (including, without limitation, the right to all
production, proceeds of production and other proceeds), and shall be subject to
the duties and obligations of such ownership attributable to the Interests for
the period of time prior to the Effective Time and Buyer shall be entitled to
all of the rights of ownership (including, without limitation, the right to all
production, proceeds of production and other proceeds) and shall be subject to
the duties and obligation of such ownership attributable to the Interests for
the period of time from and after the Effective Time. All expenses and costs,
including, without limitation, all ad valorem, property, production, severance,
and similar taxes and assessments based upon or measured by the ownership of the
Interests, the production of hydrocarbons, or the receipt of proceeds therefrom)
attributable to the Interests, shall be: (i) paid by or allocated to Sellers if
incurred or accruing with respect to operations conducted prior to the Effective
Time; or (ii) paid by or allocated to Buyer if incurred or accruing with respect
to operations conducted after the Effective Time. All hydrocarbons in storage
facilities above or upstream from the pipeline connection to each storage
facility, or downstream of delivery point sales meters on gas pipelines, as of
the Effective Time, shall belong to Sellers. All of the hydrocarbons placed in
such storage facilities or upstream of the aforesaid meters on pipelines after
the Effective Time shall belong to Buyer and shall become a part of the
Interests. In order to accomplish the foregoing allocation of production, the
parties shall rely upon the records maintained by the operator of the relevant
Interest, unless such records are demonstrated to be inaccurate.

                                       3
<PAGE>

         1.6 Risk of Loss. Buyer shall assume all risk of loss with respect to
the Interests from and after the Effective Time to Closing.

         1.7 Sellers' Agent. Castle shall act as agent on behalf of Sellers for
purposes of receiving payments of money or shares of Buyer's Common Stock under
this Agreement. Nothing herein shall limit the right of each Seller to make
individual elections as to alternative courses of action set forth in this
Agreement except as otherwise set forth in this Agreement and the Exhibits
thereto.

                                       4

<PAGE>

                                    ARTICLE 2
                                 PURCHASE PRICE

         2.1 Purchase Price. The purchase price for the Interests shall be
comprised of One Million Seven Hundred Fifty Thousand Dollars ($1,750,000) paid
by wire transfer or other immediately available funds (the "Money Payment") and
Five Hundred Eighty-Three Thousand Three Hundred Thirty-Three (583,333) shares
of Buyer's Common Stock (the "Stock Payment"). The Money Payment and the Stock
Payment shall collectively be herein called the "Purchase Price". At Closing,
the Purchase Price shall be adjusted as set forth in Section 2.3 below. In
connection with the issuance of the shares of Buyer's Common Stock pursuant to
this Section 2.1 as well as other Sections of this Agreement, Buyer and Sellers
have executed contemporaneously with this Agreement the Registration Rights
Agreement and the Investment Representation Agreements, both as defined in
Section 9.6 below.

         2.2 Earnest Money Deposits. Following Buyer's execution of this
Agreement, to assure Buyer's performance of its obligations under this
Agreement, Buyer shall deposit with Castle for the account of Castle, Three and
Seventy-Five One Hundredths Percent (3.75%) of the Money Payment, Sixty Five
Thousand Six Hundred Twenty-Five Dollars ($65,625), by wire transfer or other
immediately available funds (the "Money Deposit") plus an additional Three and
Seventy-Five One Hundredths Percent (3.75%) of the Stock Payment, Twenty One
Thousand Eight Hundred Seventy-Five (21,875) shares of Buyer's Common Stock
(the "Stock Deposit"). The Cash Deposit and the Stock Deposit being herein
collectively called the "Earnest Money Deposits". If Closing occurs, the Earnest
Money Deposits will be applied to the Adjusted Purchase Price. If Closing fails
to occur, the Earnest Money Deposits shall be handled in accordance with Section
12.2 hereof

         2.3 Adjustments to Purchase Price. At Closing, the Purchase Price shall
be adjusted as follows and the resulting amount shall be referred to herein as
the "Adjusted Purchase Price":

            (a) The Purchase Price shall be adjusted upward by the following:

                    i.   The amount of all actual operating or capital
                         expenditures or prepaid expenses attributable to the
                         Interests incurred by or on behalf of Sellers in
                         connection with the operation of the Interests and
                         which are, according to generally accepted accounting
                         principles, attributable to the period of time between
                         the Effective Time and September 30, 2000. Such
                         expenditures and expenses shall include, without
                         limitation, royalties, rentals and other charges; ad
                         valorem, property, excise, and any other taxes based
                         upon or measured by the ownership of the Interests, the
                         production of hydrocarbons or the receipt of proceeds
                         therefrom; and expenses payable to a third person under
                         applicable joint operating agreements, including,
                         without limitation, overhead charges at normal company
                         overhead labor rates and royalty disbursement fees
                         payable to operator, or similar

                                       5
<PAGE>

                         payments to third party operators, or, in the absence
                         of any joint operating agreement, those items
                         customarily billed under such an agreement.

                    ii.  The value, less taxes (other than taxes on net income),
                         of all hydrocarbons in storage facilities above or
                         upstream from the pipeline connection in each storage
                         facility, or downstream of delivery point, sales meters
                         on gas pipelines, as of the Effective Time, at the
                         prevailing market value at the time of sale in the
                         area, adjusted for grade and gravity.

                    iii. Any other amounts agreed upon by Sellers and Buyer.

            (b) The Purchase Price shall be adjusted downward by the following:

                    i.   The Earnest Money Deposits made to Castle;

                    ii.  Reductions due to Title Failures as provided in
                         Sections 10.7.

                    iii. For uncured Title Defects and Contested Defects
                         pursuant to Section 10.8

                    iv.  Reductions due to Environmental Defects as provided in
                         Section 11.3.

                    v.   The gross proceeds earned by Sellers, net of applicable
                         severance and production taxes and compression and
                         transportation charges, and derived from the sale of
                         hydrocarbons attributable to the Interests to the
                         extent owned by Buyer between the Effective Time and
                         September 30, 2000, pursuant to the provisions of
                         Section 1.5 above.

                    vi.  Reductions due to receipt by Sellers of denials to
                         consent and of exercises of preferential rights as
                         provided in Section 10.11.

                    vii. Any other amounts agreed upon by Sellers and Buyer.

            (c) Sellers shall pay all capital expenditures and expenses accruing
prior to the Closing Date referenced in Section 2.3(a)(i) above and shall
collect and receive all proceeds accruing prior to the Closing Date referenced
in Section 2.3(b)(v) above. Sellers shall be responsible for accounting for all
revenues earned and expenses incurred through September 30, 2000.

                                       6
<PAGE>

            (d) Upward and downward adjustments to the Purchase Price pursuant
to Section 2.3 shall be divided equally between the Money Payment and the Stock
Payment, on the basis of each share of Buyer's Stock being valued at Three
Dollars ($3.00) per share, rounded off to the nearest whole share.

         2.4 Purchase Price Allocation. The Purchase Price shall be allocated
among the Interests as set forth in Exhibit "B" attached hereto (the "Allocated
Values").

         2.5 Preliminary Settlement Statement. Sellers shall prepare and deliver
to Buyer at least five (5) "Business Days" (which term shall mean any day except
a Saturday, Sunday or other day on which commercial banks in Denver, Colorado
are required or authorized by law to be closed) prior to the Closing Date,
Sellers' estimate of the Adjusted Purchase Price to be paid at Closing, together
with a statement setting forth Sellers' estimate of the amount of each
adjustment to the Purchase Price to be made pursuant to Section 2.2 (the
"Preliminary Settlement Statement"). The parties shall negotiate in good faith
and attempt to agree on such estimated adjustments prior to Closing. In the
event any estimated adjustment amounts are not agreed upon prior to Closing, the
Adjusted Purchase Price for purposes of Closing shall be calculated based on
Sellers' and Buyer's agreed upon estimated adjustments and Sellers' good faith
estimation of any disputed amounts, which estimate shall be subject to
adjustment in the Final Settlement Statement pursuant to Section 9.1.

         2.6 Letter-of-Credit Note. In consideration for the Sellers' agreement
to maintain after the Closing Date the posting of certain letters-of-credit with
respect to the Interests, Buyer will deliver a promissory note (the
"Letter-of-Credit Note") in the amount of One Million Three Hundred Thousand
Dollars ($1,300,000) payable to Sellers on or before June 30, 2001, accruing
interest at the rate of eight per cent (8%) per annum, payable quarterly in
either cash or shares of the Common Stock of Buyer, at the option of Buyer, the
value of such stock being fixed at Four Dollars ($4.00) per share. The form of
the Letter-of-Credit Note is attached and made a part hereof as Exhibit E.
Should Buyer either repay in full the Letter-of-Credit Note or replace the
letters-of-credit pursuant to Section 9.5 on or before December 31, 2000,
Sellers shall return the Letter-of-Credit Note to Buyer, no interest shall be
due under the Letter-of-Credit Note and any interest previously paid thereon by
Buyer in either cash or stock shall be refunded by Sellers. Should Buyer fail to
either repay the Letter-of-Credit Note or replace the letters-of-credit pursuant
to Section 9.5 on or before June 30, 2001, Sellers shall have the option to
require payment of the One Million Three Hundred Thousand Dollars ($1,300,000)
principal balance of the Letter-of-Credit Note, either (a) by wire transfer or
other immediately available funds, or (b) Three Hundred Twenty Five Thousand
(325,000) shares of Buyer's Common Stock. If Buyer has not paid all accrued
interest on the Letter-of-Credit Note on or before June 30, 2001, Sellers shall
have the option to require payment of such accrued and unpaid interest either
(a) by wire transfer or other immediately available funds, or (b) shares of
Buyer's Common Stock valued at $4.00 per share, rounded to the nearest whole
share.

                                       7
<PAGE>

         2.7 Stock Penalty. If Closing fails to occur, Buyer shall issue to BWAB
Fourteen Thousand Five Hundred Eighty-Three (14,583) shares of the Common Stock
of Buyer (the "Stock Penalty") in accordance with Section 12.2 hereof.

                                    ARTICLE 3
                         REPRESENTATIONS AND WARRANTIES

         3.1 Representations and Warranties of Castle. Castle represents and
warrants to Buyer the following:

             (a) Castle is a limited liability company duly organized, validly
existing and in good standing under the laws of the State of Louisiana. Castle
is duly qualified to carry on its business in the State or States in which the
Interests are located and in each State where failure to so qualify would have a
material adverse effect upon its business or the Interests.

             (b) Castle has all requisite power and authority to carry on its
business as presently conducted and to enter into this Agreement and to perform
its obligations hereunder.

             (c) The execution, delivery and performance of this Agreement and
the transactions contemplated herein have been duly and validly authorized by
Castle.

             (d) This Agreement has been duly executed and delivered on behalf
of Castle, and all documents and instruments required hereunder to be executed
and delivered by Castle at or prior to Closing shall have been duly executed and
delivered. This Agreement does, and such documents and instruments shall,
constitute legal, valid and binding obligations of Castle enforceable in
accordance with their terms.

             (e) Castle has incurred no liability, contingent or otherwise, for
broker's or finder's fees or commissions relating to the transactions
contemplated by this Agreement for which Buyer shall have any responsibility
whatsoever.

         3.2 Representations and Warranties of BWAB. BWAB represents and
warrants to Buyer the following:

             (a) BWAB is a limited liability company duly organized, validly
existing and in good standing under the laws of the State of Colorado. BWAB is
duly qualified to carry on its business in the State or States in which the
Interests are located and in each State where failure to so qualify would have a
material adverse effect upon its business or the Interests.

             (b) BWAB has all requisite power and authority to carry on its
business as presently conducted and to enter into this Agreement and to perform
its obligations hereunder.

                                       8
<PAGE>

             (c) The execution, delivery and performance of this Agreement and
the transactions contemplated herein have been duly and validly authorize by
BWAB.

             (d) This Agreement has been duly executed and delivered on behalf
of BWAB, and all documents and instruments required hereunder to be executed and
delivered by BWAB at or prior to Closing shall have been duly executed and
delivered. This Agreement does, and such documents and instruments shall,
constitute legal, valid and binding obligations of BWAB enforceable in
accordance with their terms.

             (e) BWAB has incurred no liability, contingent or otherwise, for
broker's or finder's fees or commissions relating to the transactions
contemplated by this Agreement for which Buyer shall have any responsibility
whatsoever.

         3.3 Representations and Warranties of Sellers. Each of Sellers
separately represents and warrants to Buyer the following:

             (a) There are no outstanding authorizations for expenditures
("AFEs") that (i) require the drilling of wells or other material development
operations in order to earn or to continue to hold all or any portion of the
Interests, or (ii) obligate Sellers to make payments of any amounts in
connection with drilling of wells or other material capital expenditures
affecting the Interests.

             (b) Sellers are not obligated to deliver hydrocarbons produced from
the Interests at some future time without then or thereafter receiving full
payment for the production attributable to Sellers' ownership in and to the
Interests by virtue of: (i) a prepayment arrangement under any contract for the
sale of hydrocarbons and containing a "take or pay," or similar provisions, (ii)
a production payment, or (iii) any other arrangement.

             (c) Except for those taxes and assessments for which a Purchase
Price adjustment is made under Section 2.3(b)(v), during the period of Sellers'
ownership of the Interests, Sellers have properly paid all ad valorem, property,
production, severance, excise and similar taxes and assessments based on or
measured by the ownership of property or the production of hydrocarbons or the
receipt of proceeds therefrom on the Interests that have become due and payable
before the Effective Time.

             (d) No suit, action, claim, or other proceeding is pending or, to
the best of Sellers' knowledge, threatened before any court, arbitration panel
or governmental agency which relates to the Interests and which might result in
a material loss of Sellers' title to any portion of the Interests, or a material
diminution of the value of any of the Interests, or that might materially hinder
or impede the operation of the Leases.

             (e) As used in this Agreement, the term, "Existing Documents" shall
mean all of the oil, gas and other mineral leases, assignments or other
instruments or agreements that comprise the Interests, and all contractually
binding arrangements to which the Interests may be subject and which will be
binding on the Interests or Buyer after Closing (including, without limitation,
oil, gas and other mineral leases, overriding royalty assignments, farm-out and
farm-in agreements, option agreements, forced pooling orders, assignments of
production payments, partnership agreements, unit agreements, unit operating
agreements, joint operating agreements, balancing agreements, unit operating
agreements, production contracts, processing contracts, gas sales contracts,

                                       9

<PAGE>

marketing and transportation contracts and division orders). To the best of
Sellers' knowledge, (i) all Existing Documents are in full force and effect and
are the valid and legally binding obligations of the parties thereto and are
enforceable in accordance with their respective terms (subject to the effects of
bankruptcy, insolvency, reorganization, moratorium and similar laws); (ii)
Sellers are not in material breach or default with respect to any of its
obligations pursuant to any such Existing Documents; and (iii) all payments
(including, without limitation, royalties, delay rentals, shut-in royalties and
valid calls under unit or operating agreements) due thereunder have been timely
paid and Sellers have received no notice of default under any of the Existing
Documents.

             (f) To the best of Sellers' knowledge, all of the Equipment Sellers
operate has been maintained in a state of repair so as to be adequate for normal
operations.

             (g) To the best of Sellers' knowledge, all of the Wells that have
been drilled and completed have been so drilled and completed within the
boundaries and limits permitted by contract, pooling or unit agreement, and by
law; and all drilling, completion, and other operations on or affecting the
Leases have been conducted in compliance with all applicable laws, ordinances,
rules, regulations and permits, and judgments, orders and decrees of any court
or governmental body or agency. No Well is subject to penalties or allowables
after the date hereof because of any over-production or any other violation of
applicable laws, rules, regulations or permits or judgments, orders of decrees
of any court or governmental body or agency.

             (h) Except as set forth on Exhibit "C" attached hereto:

                  (i)    Sellers' operations and activities with respect to the
                         Interests comply in all respects with all applicable
                         governmental laws, including, without limitation,
                         health and safety statutes and regulations and all
                         Environmental Laws, including any provisions requiring
                         notice to government agencies under Environmental Laws.

                  (ii)   There is no civil, criminal or administrative action,
                         suit, demand, claim, hearing, notice of violation,
                         investigation, proceeding, notice or demand letter
                         ("Environmental Proceeding") known to Sellers pending
                         or, to the best of Sellers' knowledge, threatened
                         against Sellers or any of the Interests relating in any
                         way to the Environmental Laws.

                                       10

<PAGE>

                  (iii)  Neither Sellers nor, to the best of Sellers'
                         knowledge, any other person have released, placed,
                         stored, buried or dumped any Hazardous Substances, Oil,
                         Pollutants or Contaminants or any other wastes on,
                         beneath, or adjacent to the Leases, except for
                         inventories of such substances to be used in the
                         ordinary course of business of Sellers (which
                         inventories and wastes, if any, were and are stored or
                         disposed of in accordance with applicable laws and
                         regulations).

                  (iv)   To the best of Sellers' knowledge, Sellers have not
                         received any notice or order from any governmental or
                         other public agency advising it that Sellers are
                         responsible for or potentially responsible for Cleanup
                         or paying for the cost of Cleanup of any Hazardous
                         Substances, Oils, Pollutants, or Contaminants or any
                         other waste or substance affecting the Interests.
                         Sellers are not aware of any facts which might
                         reasonably give rise to any such notice or order.

                  (v)    The term "Cleanup" shall mean all actions required to:
                         (1) cleanup, remove, treat or remediate Hazardous
                         Substances, Oils, Pollutants or Contaminants; (2)
                         prevent the Release of Hazardous Substances, Oils,
                         Pollutants or Contaminants so that they do not migrate,
                         endanger or threaten to endanger public health or
                         welfare or the environment; (3) perform pre-remedial
                         studies and investigations and post-remedial monitoring
                         and care; or (4) respond to any government requests for
                         information or documents in any way relating to
                         cleanup, removal, treatment or remediation or potential
                         cleanup, removal, treatment or remediation of Hazardous
                         Substances, Oils, Pollutants or Contaminants in the
                         indoor or outdoor environment.

                  (vi)   The term "Environmental Laws" shall mean all foreign,
                         Federal, state and local laws, regulations, rules and
                         ordinances relating to polluting or protection of the
                         environment, including, without limitation, laws
                         relating to Releases or threatened Releases of
                         Hazardous Substances, Oil, Pollutants or Contaminants
                         into the indoor or outdoor environment (including,
                         without limitation, ambient air, surface water,
                         groundwater, land, surface and subsurface strata) or
                         otherwise relating to the manufacture, processing,
                         distribution, use, treatment, storage, Release,
                         transport or handling of Hazardous Substances, Oil,
                         Pollutants or Contaminants, and all laws and
                         regulations with regard to record keeping,
                         notification, disclosure and reporting requirements
                         respecting Hazardous Substances, Oils, Pollutants or
                         Contaminants.

                                       11
<PAGE>

                  (vii)  The term "Hazardous Substances, Oils, Pollutants or
                         Contaminants" shall mean all substances defined as such
                         in the National Oil and Hazardous Substances Pollution
                         Contingency Plan, or defined as such by, or regulated
                         as such under, any Environmental Law.

                  (viii) The term "Release" or "Releases" means any release,
                         spill, emission, discharge, leaking, pumping,
                         injection, deposit, disposal, discharge, dispersal,
                         leaching or migration into the indoor or outdoor
                         environmental (including, without limitation, ambient
                         air, surface water, groundwater, and surface or
                         subsurface strata) or into or out of any property,
                         including the movement of Hazardous Substances, Oils,
                         Pollutants or Contaminants through or in the air, soil,
                         surface water, groundwater or property.

         3.4 Representations and Warranties of Buyer. Buyer represents and
warrants to Sellers the following:

             (a) Buyer is a corporation, duly organized, validly existing and in
good standing under the laws of the State of Pennsylvania. Buyer is or will be
prior to Closing duly qualified to conduct business in the State or States in
which the Interests are located.

             (b) Buyer has all requisite power and authority to carry on its
business as presently conducted, to enter into this Agreement, and to purchase
the Interests on the terms described in this Agreement and perform its other
obligations under this Agreement.

             (c) The execution, delivery and performance of this Agreement and
the transactions contemplated hereby have been duly and validly authorized.

             (d) This Agreement has been duly executed and delivered by or on
behalf of Buyer; all documents and instruments required hereunder to be executed
and delivered by Buyer at or prior to Closing shall have been duly executed and
delivered; and this Agreement does, and such documents and instruments shall,
constitute legal, valid and binding obligations of Buyer enforceable in
accordance with their terms.

             (e) Buyer has incurred no liability, contingent or otherwise, for
broker's or finder's fees or commissions relating to the transactions
contemplated by this Agreement for which Sellers shall have any responsibility
whatsoever.

             (f) All shares of the Common Stock of Buyer issued to Sellers
pursuant to this Agreement shall be duly authorized and when issued shall be
fully paid, non-assessable shares of the Common Stock of Buyer and shall carry
all of the same rights and privileges as all other issues of Buyer's Common
Stock.

                                       12
<PAGE>

             (g) Prior to Closing, Buyer will have inspected the Interests, the
public records and Sellers' files for all purposes, including, but not limited
to, detecting the presence and concentration of naturally-occurring radioactive
materials and satisfying itself as to the physical condition and environmental
condition of the Interests, both surface and subsurface. In entering into this
Agreement, Buyer has relied solely on the express representations and covenants
of Sellers in this Agreement, its independent investigation of, and judgment
with respect to, the Interests and the advice of its own legal, tax, economic,
environmental, engineering, geological and geophysical advisors, and not on any
comments or statements of any representatives of, or consultants or advisors
engaged by Sellers.

             (h) At Closing, Buyer will meet the bonding and other requirements
required by all governmental authorities in respect to the Interests (and
Sellers agree to provide Buyer, prior to Closing, with a list of such
requirements) and, after Closing, Buyer anticipates that it will continue to be
able to meet such bonding requirements. Buyer is, and after the Closing is
expected to continue to be, otherwise qualified to own the Interests. The
consummation of the transactions contemplated hereby will not cause Buyer to be
disqualified to be an owner of oil, gas, and mineral leases or to exceed any
acreage limitation imposed by law, statute, rule or regulation. Buyer is not
aware of any fact that could reasonably be expected to cause the appropriate
governmental authorities to fail to unconditionally approve the assignment of
the Interests to Buyer. Sellers will cooperate and will assist Buyer relating to
the preparation and presentation of documents relating to changes in ownership
and/or operatorship of the Interests.

             (i) Buyer is an experienced and knowledgeable investor and operator
in the oil and gas business. Buyer is acquiring the Interests for its own
account and not with a view to, or for offer of resale in connection with, a
distribution thereof, within the meaning of the Securities Act of 1933, as
amended, or any other rules, regulations, and laws pertaining to the
distribution of securities.

             (j) Buyer has arranged or will have arranged to have available by
the Closing Date sufficient funds to enable the payment to Sellers, by wire
transfer, of the Adjusted Purchase Price in accordance with Section 2.3 and to
otherwise perform Buyer's obligations under this Agreement.

                                    ARTICLE 4
                          CERTAIN AGREEMENTS OF SELLERS

         4.1 Agreements Between Execution of Agreement and Closing. During the
period between the execution of this Agreement and the Closing Date, Sellers
shall not, without the prior written consent of Buyer, (i) sell, convey, assign,
transfer or encumber any of the Interests; (ii) make or agree to make any
expenditure in excess of $25,000.00, net to Sellers' interest, except for

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obligations under existing contracts, expenditures necessary to maintain the
Interests, or in the event of any emergency as to which Sellers have notified
Buyer; (iii) sell oil, gas or other minerals from the Interests except sales
made in the ordinary course of business; (iv) enter into any agreement amending,
modifying or terminating any of the Leases; or (v) take any other action with
respect to any of the Interests that would cause a material diminution in the
value thereof or that would materially and adversely affect the use and
enjoyment thereof.

         4.2 Access to Records. Following the execution of this Agreement by the
Parties, Sellers shall afford to Buyer and its authorized representatives,
during normal business hours, reasonable access to well and land files, title,
contract and legal materials and operating data and information in Sellers'
possession or to which it has access affecting the Interests.

         4.3 Notification of Additional Proceedings. Sellers shall promptly
notify Buyer of any new suits, actions, claims or other proceedings threatened
or pending before, or required to be filed with, any court, arbitrator or
governmental agency which relate to the Interests.

         4.4 Consents. Sellers shall use their best efforts to obtain any
consents necessary to transfer the Interests to Buyer.

         4.5 Letters-of-Credit. Subject to the provisions of Section 9.5,
Sellers will leave in place their letters-of-credit with respect to the
Interests until Buyer obtains replacement letters-of-credit.

                                    ARTICLE 5
                           CERTAIN AGREEMENTS OF BUYER

         5.1 Cooperation. Buyer shall cooperate with Sellers to assist Sellers
in carrying out the agreements of Sellers hereunder.

                                    ARTICLE 6
                          BUYER'S CONDITIONS TO CLOSING

         The obligations of Buyer to consummate the transactions provided for
herein are subject, at the option of Buyer, to the fulfillment on or prior to
Closing of each of the following conditions:

         6.1 Representations. The representations and warranties by Castle set
forth in Section 3.1, by BWAB set forth in Section 3.2 and by Sellers set forth
in Section 3.3 above shall be true and correct in all material respects as of
the date of this Agreement and as of the Closing Date.

                                       14
<PAGE>

         6.2 Changes. There shall have been no material adverse change in the
physical condition of the Interests, except depletion through normal production
within authorized allowable and rates of production, depreciation of equipment
through ordinary wear and tear, and other transactions permitted under this
Agreement or approved in writing by Buyer.

         6.3 Performance. Sellers shall have timely performed and complied with
all agreements and covenants required by this Agreement.

         6.4 No Legal Proceedings. No suit, action or other proceeding shall be
pending or threatened before any court, arbitration panel or governmental agency
seeking to restrain, prohibit or declare illegal, or seeking substantial damages
in connection with the purchase and sale contemplated by this Agreement, or
which might result in a material loss of any portion of the Interests, a
material diminution in the value of any of the Interests, or materially
interfere with the use or enjoyment of the Interests, except (i) matters that
are disclosed on Exhibit "D" or (ii) any suit or proceeding affecting only a
portion of the Interests, which portion could be treated as subject to a Title
Defect in accordance with Article 10.

         6.5 Existing Documents. Buyer must be reasonably satisfied with the
terms and conditions of the Existing Documents.

                                    ARTICLE 7
                         SELLERS' CONDITIONS TO CLOSING

         The obligations of Sellers to consummate the transactions provided for
herein are subject, at the option of Sellers, to the fulfillment on or prior to
Closing of each of the following conditions:

         7.1 Representations. The representations and warranties by Buyer set
forth in Section 3.4 above shall be true and correct in all material respects as
of the date of this Agreement and as of the Closing Date.

         7.2 Performance. Buyer shall have timely performed and complied in all
material respects with all agreements and covenants required by this Agreement.

         7.3 No Legal Proceedings. No suit or other proceeding shall be pending
before any court or governmental agency seeking to restrain prohibit or declare
illegal, or seeking substantial damages in connection with, the sale
contemplated by this Agreement, except (i) matters with respect to which Sellers
have been adequately indemnified by Buyer or (ii) any suit or other proceeding
affecting only a portion of the Interests, which portion could be treated as
subject to a Title Defect in accordance with Article 10.

                                       15
<PAGE>

                                    ARTICLE 8
                                     CLOSING

         8.1 Date of Closing. Subject to the conditions stated in this
Agreement, the purchase and sale of the Interests pursuant to this Agreement
(the "Closing") shall occur on or before September 30, 2000, at 10:00 a.m.,
Mountain Time, or on such other date and time as Buyer and Sellers may agree
(the "Closing Date").

         8.2 Place of Closing. The Closing shall be held at the offices of
Sellers as set forth hereinabove; provided, however, the Parties may agree to
close via facsimile or overnight mail.

         8.3 Closing Obligations. At the Closing, the following documents shall
be delivered and the following events shall occur, each event being a condition
precedent to the others and each being deemed to have occurred simultaneously
with the others:

                  (i)    Sellers shall execute and deliver: (1) an Assignment,
                         Bill of Sale and Conveyance in the form attached hereto
                         as Exhibit "D" (the "Assignment") (in sufficient
                         counterparts to facilitate recording) conveying the
                         Interests, subject to the Permitted Encumbrances; (2)
                         such other instruments as may be required to convey the
                         Interests to Buyer and otherwise effectuate the
                         transactions contemplated by this Agreement.

                  (ii)   Sellers and Buyer shall execute and deliver the
                         Preliminary Settlement Statement.

                  (iii)  Buyer shall deliver by direct bank or wire transfer to
                         Sellers or to Sellers' account (at such place as may be
                         designated by Sellers in a written notice, such notice
                         to be delivered to Buyer not less than two (2) Business
                         Days prior to the Closing) the Money Payment of the
                         Adjusted Purchase Price and shall deliver to Seller the
                         Stock Payment of the Adjusted Purchase Price.

                  (iv)   Sellers shall deliver on forms supplied by Buyer
                         transfer orders or letters in lieu thereof, directing
                         the operator or purchaser to make payment of proceeds
                         attributable to production from the Interests after the
                         Effective Time to Buyer.

                  (v)    Buyer shall execute and deliver to Sellers the
                         Letter-of-Credit Note.

         8.4 Records. In addition to the obligations set forth under Sections
4.2 and 8.3 above, within thirty (30) days after Closing, Sellers shall deliver
to Buyer all original well and land files in its possession or to which it has
access. Buyer shall be entitled to all original records affecting the Interests
assigned to Buyer pursuant to the terms of this Agreement. Sellers shall be
entitled to keep a copy of such records for its files. Buyer agrees to preserve
and maintain such records for at least five (5) years after the Closing Date and
to provide Sellers access to such records during normal business hours during
such period.

                                       16
<PAGE>

                                    ARTICLE 9
                              POST-CLOSING MATTERS

         9.1 Final Settlement Statement. As soon as practicable after the
Closing, but in no event later than ninety (90) days after Closing, Sellers
shall prepare and deliver to Buyer, in accordance with this Agreement and
generally accepted accounting principles, a statement ("Final Settlement
Statement") setting forth each adjustment (other than adjustments for Title
Defects) finally determined as of Closing and showing the calculation of such
adjustments. Within thirty (30) days after receipt of the Final Settlement
Statement, Buyer shall deliver to Sellers a written report containing any
changes that Buyer proposes be made in good faith to resolve any questions with
respect to the amounts due pursuant to such Final Settlement Statement no later
than one hundred twenty (120) days after the Closing.

         9.2 Unpaid Third Party Funds. At such time as Buyer and Sellers agree
on a Final Settlement Statement, Sellers will transfer to Buyer all funds held
by Sellers in suspense for a third party owner of royalty, overriding royalty,
working interests, mineral interest or other similar interests, attributable to
the Interests, and will deliver all records in Sellers' possession, including a
schedule of such funds listing the owners thereof, which may be used to
determine proper disbursement. Buyer shall thereafter be responsible for
determining the proper payment of such amounts and shall indemnify and hold
harmless Sellers from and against any and all cost, loss or expense of whatever
kind, including attorneys' fees, arising from or in connection with the claim or
any person, up to the amount listed on the schedule provided by Sellers with
respect thereto, with respect to the funds transferred to Buyer pursuant to this
Section 9.2.

         9.3 Further Assurances. After Closing, Sellers, and Buyer shall
execute, acknowledge and deliver or cause to be executed, acknowledged and
delivered such instruments and take such other action as may be necessary or
advisable to carry out their obligations under this Agreement and under any
Exhibit, document, certificate or other instrument delivered pursuant hereto.

         9.4 Survival. All representations and warranties set forth in this
Agreement in Sections 3.1 (a) - (e), 3.2 (a) - (e), 3.3 (a) - (c) and 3.4 (a) -
(f) shall survive the Closing, but no other representations and warranties shall
survive the Closing.

         9.5 Letters-of-Credit.

         (a)   Subject to the provisions of this Section 9.5, Sellers will leave
               in place their letters-of-credit with respect to the Interests
               until Buyer obtains replacement letters-of-credit.

                                       17
<PAGE>

         (b)   Buyer will use its best efforts to obtain letters-of-credit to
               replace those posted by Sellers with respect to the Interests as
               soon as possible, but not later than June 30, 2001.

         (c)   If Sellers require payment from Buyer of the Letter-of-Credit
               Note on or after June 30, 2001, and Buyer pays the
               Letter-of-Credit Note, Sellers shall assign to Buyer Sellers' One
               Million Three Hundred Thousand Dollars ($1,300,000) certificates
               of deposit to secure Buyer's replacement letters-of-credit.

         (d)   If the beneficiaries of the posted letters-of-credit withhold
               their consent to accept the letters-of-credit obtained by Buyer
               in replacement for Sellers' posted letters-of-credit, Buyer
               instead will obtain letters-of-credit in favor of Sellers to
               support Sellers' posted letters-of-credit within twenty (20) days
               following notification by such beneficiaries withholding consent.

         9.6 Buyer's Stock. Buyer grants to Sellers piggyback registration
rights with respect to any shares of Buyer's Common Stock assigned to Sellers
pursuant to this Agreement. If Buyer does not cause such shares attributable to
the Stock Deposit, Stock Penalty or Stock Payment or to be registered on or
before December 31, 2000, Sellers are entitled to one demand registration of
such shares at Buyer's expense. If Sellers receive shares of Buyer's Common
Stock in payment for principal and/or interest due under the Letter-of-Credit
Note pursuant to Section 2.6, and Buyer does not cause such shares to be
registered on or before December 31, 2001, Sellers are entitled to one demand
registration of such shares at Buyer's expense. The provisions of Sellers'
registration rights are more specifically set forth in the Registration Rights
Agreement to be executed by the Parties attached hereto as Exhibit "F" and
incorporated herein (the "Registration Rights Agreement"). The representations
of the Sellers as to their suitability to receive shares of the Common Stock of
Buyer pursuant to this Agreement are more specifically set forth in the
Investment Representation Agreements to be executed by the Parties attached
together hereto as Exhibit "G" and incorporated herein (the "Investment
Representation Agreements")

                                   ARTICLE 10
                                  TITLE MATTERS

         10.1 Access to Title and Other Documents.

             (a) After the date hereof, Sellers will make available to Buyer and
to its representatives (such representatives to include employees, consultants,
independent contractors, attorneys and other advisors of Buyer) for Buyer's
copying and/or inspection (at Buyer's cost and expense), at Sellers' offices
during normal business hours the following documents in Sellers' possession or
under its control:

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<PAGE>

                  (i)    All abstracts of title, title opinions, title curative
                         materials, ownership reports, division orders, bills of
                         sale, other documents evidencing transfers of title,
                         tax receipts, and licenses and registrations pertaining
                         to the Interests.

                  (ii)   All of the lease records, lease files, leases,
                         conveyances and assignments of interest in the Leases;
                         unitization, unit, pooling and operating agreements;
                         division orders; contracts; transfer orders; orders of
                         the applicable regulatory authorities or administrative
                         agencies; mortgages, deeds of trust, security
                         agreements, and financing statements; and all other
                         contracts, agreements and documents affecting the
                         Interests.

                  (iii)  Instruments and documents concerning proper payment of
                         all general and special assessments, ad valorem and
                         property taxes, and production, severance and similar
                         taxes and assessments based on or measured by the
                         ownership of the Interests, the production of
                         hydrocarbons, or the receipt of proceeds therefrom for
                         1999 and years prior for which the applicable statute
                         of limitations has not expired.

                  (iv)   All geological maps, geophysical surveys, ownership
                         maps, seismic surveys, logs, core studies, and surveys
                         relating to the Interests.

                  (v)    All production records; transportation agreements;
                         contracts concerning the purchase of gas, oil,
                         casinghead gas, distillate, gas condensate or other
                         hydrocarbons; processing agreements; all correspondence
                         relating to the Interests; and data sheets relating to
                         the Interests and to bonuses, rentals and royalties
                         payable with respect thereto.

                  (vi)   All agreements relating to the purchase, sale,
                         processing, and transportation of production from the
                         Wells.

                  (vii)  All bonds, leases, permits, easements, licenses,
                         orders, saltwater disposal agreements, agreements with
                         pumpers and other agreements in any way relating to the
                         Interests or the operation thereof.

Reliance on such information shall be at the sole risk of the Buyer, and Sellers
make no guaranty or representation as to the accuracy or completeness of such
data, except as otherwise provided in this Agreement.

         Sellers shall authorize Buyer and its representatives to consult with
attorneys, abstract companies and other consultants or independent contractors
of Sellers (whether utilized in the past or present) concerning title related
matters. Reliance on such information of such third parties shall be at the sole
risk of the Buyer, and Sellers make no guaranty or representation as to the
accuracy or completeness of such data.

                                       19
<PAGE>

         10.2 No Warranty or Representation. At the Closing, Sellers shall
convey to Buyer all the Interests. Such conveyance shall be subject to the
Permitted Encumbrances and WITHOUT ANY WARRANTY OF TITLE, EITHER EXPRESS OR
IMPLIED, AND WHETHER BY COMMON LAW, STATUTE OR OTHERWISE, except for the
warranty of title as to persons claiming by, through and under Sellers contained
in the Assignment. Without limiting Buyer's right to reduce the Purchase Price
in the manner provided in this Article 10, Sellers make no warranty or
representation, express or implied, with respect to the accuracy or completeness
of any information. Records or data now, heretofore, or hereafter made available
to Buyer in connection with this Agreement, including, without limitation, any
description of the Interests, pricing assumptions, potential for production of
hydrocarbons from the Interests, or any other matters contained in any material
furnished by Sellers to Buyer or its officers, directors, employees, agents,
advisors or representatives.

         10.3 Disclaimer. ALL PERSONAL PROPERTY, MACHINERY, FIXTURES, EQUIPMENT
AND MATERIALS CONVEYED HEREBY ARE SOLD AND ASSIGNED AND ACCEPTED BY BUYER IN
THEIR "WHERE IS, AS IS" CONDITION, WITHOUT ANY WARRANTIES, EXPRESS OR IMPLIED OR
STATUTORY, OF MARKETABILITY, QUALITY, CONDITION, MERCHANTABILITY AND/OR FITNESS
FOR A PARTICULAR PURPOSE OR USE, ALL OF WHICH ARE EXPRESSLY DISCLAIMED.

         10.4 Permitted Encumbrances. As used in this Agreement, the term
"Permitted Encumbrances" shall mean the following, provided that the same shall
not operate to reduce the net revenue interest or increase the gross working
interest of an Interest beyond that shown on Exhibit "A":

             (a) Lessors' royalties, non-participating royalties, overriding
royalties, division orders, reversionary interests, and similar burdens.

             (b) Preferential rights to purchase and required third party
consents to assignments and similar agreements, with respect to which, prior to
Closing (i) waivers or consents are obtained from the appropriate parties, (ii)
the appropriate time period for asserting such rights has expired without an
exercise of such rights, or (iii) arrangements acceptable to Buyer can be made
by Buyer and Sellers to allow Buyer to receive substantially the same economic
benefits as if all such waivers and consents to assign have been obtained.

             (c) Liens for taxes or assessments not yet due or delinquent or, if
delinquent, that are being contested in good faith in the normal course of
business.

                                       20
<PAGE>

             (d) All rights to consent by, required notices to, filing with, or
other actions by governmental entities in connection with the sale or conveyance
of oil and gas leases or interests therein, if the same are customarily obtained
subsequent to such sale or conveyance and neither Sellers nor Buyer has no
reason to believe they cannot be obtained.

             (e) Such Title Defects as Buyer may have waived in writing.

             (f) Rights reserved to or vested in any governmental authority.

             (g) Rights of a common owner of any Interest in rights-of-way or
easements currently held by Sellers and such common owner as tenants in common
or through common ownership.

             (h) Easements, conditions, covenants, restrictions, servitudes,
permits, rights-of-way, surface leases and other rights in the Interests for
the purpose of surface operations, roads, alleys, highways, railways, pipelines,
transmission lines, transportation lines, distribution lines, power lines,
telephone lines, and removal of timber, grazing, logging operations, canals,
ditches, reservoirs and other like purposes, or for the joint or common use of
real estate, rights-of-way, facilities and equipment which do not materially
impair the rights held by Buyer or the use and enjoyment of the Interests.

             (i) Defects, irregularities and deficiencies in title to any
rights-of-way, easements, surface lease or other rights which in the aggregate
do not materially impair the use of such right-of-way, easements, surface
leases or other rights for the purpose of which such rights will be held by
Buyer.

             (j) Zoning, planning and environmental laws and ordinances and
municipal regulations.

             (k) Vendors, carriers, warehousemen, repairmen, mechanics, workmen,
materialmen, construction or other like liens arising by operation of law in the
ordinary course of business or incident to the construction or improvement of
any property in respect of obligations which are not yet due, or which are being
contested in good faith by appropriate proceedings by or on behalf of Sellers.

             (l) Liens created under operating agreements in respect of
obligations that are not yet due or that are being contested in good faith by
appropriate proceedings by or on behalf of Sellers.

             (m) The terms and provisions of the Existing Documents.

                                       21
<PAGE>

         10.5 Good and Defensible Title. For the purposes of this Article 10,
the term "Good and Defensible Title" shall mean, with respect to each of the
Interests, that title of Sellers which, subject to and except for Permitted
Encumbrances:

             (a) Entitles Sellers, throughout the duration of the relevant
Interest, to receive from such Interest (free and clear of all royalties,
overriding royalties, non-participating royalties, net profits interests, or
other burdens on or measured by production of hydrocarbons) not less than the
interest shown as the net revenue interest on Exhibit "A" in all hydrocarbons
produced, saved and marketed from the Interest and of all hydrocarbons produced,
saved, and marketed from any unit of which the Interest is a part and which is
allocated to such Interest; all without reduction, suspension, or termination of
the Interest.

             (b) Obligates Sellers to bear the percentage of the costs and
expenses relating to the maintenance and development of, and operations relating
to, the Interest not greater than the gross working interest shown on Exhibit
"A" without increase throughout the duration of such Interest.

             (c) Is free and clear of liens, encumbrances and defects.

             (d) All irregularities of title that would not reasonably be
expected to result in claims that would materially and adversely affect Sellers'
title to an Interest shall not be considered a Title Defect, including but not
limited to (i) defects in the chain of title consisting of failure to recite
marital status or the omission of succession or heirship proceedings; (ii)
defects or irregularities arising out of prior oil and gas leases which, on
their face, expired more than three (3) years prior to the Effective Time, and
which have not been released of record; (iii) defects or irregularities arising
out of acknowledgments, questions of identity, trusts or trustees, executors and
personal representatives, and the manner in which they executed documents or
were identified thereon; (iv) defects or irregularities arising out of mortgages
or deeds of trust which, by their terms, matured more than six (6) years prior
to the Effective Time but which remain unreleased of record; (v) defects or
irregularities arising out of the lack of survey of specific land or lease
description; (vi) defects or irregularities arising out of the lack of recorded
powers of attorneys from corporations, banks, trusts or personal representatives
to execute and deliver documents on their behalf or on behalf of others; (vii)
defects or irregularities cured by possession under applicable statutes of
limitation and statutes relating to prescription.

         10.6 Notice of Title Defect. Except for Permitted Encumbrances, any
defect in title, lien, encumbrance, or defect that would cause Sellers' title to
any Interest not to be Good and Defensible Title shall be a title defect ("Title
Defect"). Not later than five (5) days before the Closing Date (the "Warranty
Claim Date"), Buyer must notify Sellers in writing of any matter that Buyer
considers to be a Title Defect ("Notice of Title Defect"), which notice shall
include, (i) a specific description of the matter Buyer asserts as a Title
Defect, (ii) a specific description of the Interest or the portion of the
Interest that is affected by the Title Defect, (iii) Buyer's calculation of the

                                       22

<PAGE>

amount ("Title Defect Amount") that the value of the Interest should be reduced
because of the Title Defect based on the Allocated Value shown on Exhibit "B,"
and (iv) appropriate supporting documentation.

         Notwithstanding anything to the contrary in this Agreement, the Buyer
shall be deemed to have waived any Title Defect which the Buyer has not
specifically asserted in its Notice of Title Defect presented before the
Warranty Claim Date.

         10.7 Title Failure. Any item that Sellers acknowledges is a Title
Defect but that Sellers are unwilling to cure shall be deemed a title failure
("Title Failure") and, subject to Section 10.9 below, the Purchase Price shall
be reduced for such Title Defect pursuant to Section 2.3 unless, in Sellers'
reasonable judgment, it is unlikely that material losses, costs, expenses and
liabilities will be experienced with respect to such Title Defect and Sellers
agree to indemnify Buyer with respect thereto.

         10.8 Defect Notice; Sellers' Opportunity to Cure. To the extent that
Sellers dispute that any item described in the Notice of Title Defect actually
constitutes a Title Defect or disputes the Title Defect Amount assigned by Buyer
to any such Title Defect ("Contested Defect"), Sellers shall deliver to Buyer a
notice so stating ("Defect Notice"). Subject to the provisions of 10.9 below,
the portion of the Purchase Price attributable to Title Defects which Sellers
are willing to cure but which are uncured at Closing, or which are not waived by
Buyer at Closing (including Contested Defects), shall be deposited into an
escrow account pursuant to an escrow agreement agreed to by the Parties and the
Assignment will be revised to delete all of that portion of the Interests
affected by such Title Defects (including Contested Defects). If Sellers fail to
cure a Title Defect within ninety (90) days after Closing, it shall be deemed a
Title Failure and the funds attributable to such Title Defect shall be released
from escrow to Buyer and the property on which such Title Defect exists shall
not be conveyed to Buyer.

         10.9 Title Purchase Price Adjustments. Notwithstanding any provision
hereof to the contrary, there shall be no reduction in the Purchase Price for
Title Failures and no escrow for Title Defects or Contested Defects unless and
until the aggregate amount of such Title Defects (including Title Failures and
Contested Defects) exceeds four percent (4%) of the Purchase Price and only for
the amount in excess of such amount.

         10.10 Termination Amount. Notwithstanding any provision hereof to the
contrary, in the event the aggregate adjustments for Title Defects pursuant to
this Article 10 and for Environmental Defects pursuant to Article 11 amount to
twenty percent (20%) or more of the Adjusted Purchase Price (the "Termination
Amount"), either Party shall have the option to terminate this Agreement,
without any liability, upon written notice to the other Party.

         10.11 Preferential Rights and Consents to Assign. Some Interests may be
subject to existing preferential rights to purchase the Interests or consents
may be required in order to assign the Interests. Sellers shall provide Buyer
with a list, and shall make a good faith effort to obtain consent and waivers of

                                       23

<PAGE>

any preferential rights which Sellers know must be obtained prior to Closing and
are not ordinarily obtained after Closing. Buyer shall notify Sellers of any
additional consent requirement or preferential right to purchase it discovers
prior to Closing. If a preferential right is exercised or a consent is denied
prior to Closing, the Purchase Price shall be adjusted downward in an amount
equal to the price paid to Sellers for the Interest with respect to which the
preferential right has been exercised or the consent has been denied and such
Interest shall be deleted from this Agreement. In the case of a preferential
right to purchase, Sellers shall be entitled to all proceeds paid by the third
party exercising its preferential right to purchase. If a third party
preferential purchase right burdening any Interest has not been exercised or
waived by Closing, Buyer shall pay for and accept an assignment covering such
Interest and, if the preferential right is exercised after Closing, Buyer shall
be entitled to all proceeds paid for such interest by the third party exercising
such preferential purchase right. Buyer shall be responsible for conveying title
to the Interest affected by said preferential right to the party exercising the
same and shall indemnify and hold Sellers harmless from and against any claim or
liability for Buyer's failure to make such conveyance.

                                   ARTICLE 11
                                  ENVIRONMENTAL

         11.1 Inspection; Indemnity. Buyer and its authorized representatives,
at Buyer's sole risk and expense, shall have the right to enter upon and inspect
the real and personal properties comprising the Interests, and to conduct such
well, environmental and other tests and assessments as Buyer shall deem
appropriate, subject to the approval of the operator in the case of non-operated
properties. Buyer shall repair any damages to the Interests resulting from its
inspection and shall defend and hold Sellers harmless from and against any and
all losses, damages, claims, obligations, liabilities, expenses (including court
costs and attorneys' fees) or causes of action directly resulting from Buyer's
inspection of the Interests.

         11.2 Environmental Assessment. As part of its inspection of the
Interests, Buyer and its authorized representatives shall have the right to
conduct soil and water tests and borings, and generally to conduct such tests,
examinations, investigations and studies as may be necessary or appropriate in
Buyer's sole judgment to make an environmental assessment of the Interests.
Buyer shall keep any data or information acquired through such examination and
the results of all analyses of such data and information strictly confidential
and shall not disclose the same to any person or agency without the prior
written approval of Sellers unless such disclosure is required by law. Buyer
shall take all steps necessary to ensure that Buyer's authorized representatives
comply with the provisions of this Article 11. If Buyer has discovered in its
environmental assessment circumstances which require remediation, control or
other response under environmental laws, rules or regulations then in effect (an
"Environmental Defect"), Buyer shall notify Sellers of such circumstances as
soon as practicable, but in no event less than ten (10) days prior to Closing.

                                       24
<PAGE>

         11.3 Environmental Defects If Buyer properly notifies Sellers of an
Environmental Defect related to an Interest, Buyer may (i) waive the
Environmental Defect and Close, or (ii) request Sellers to cure the
Environmental Defect. If Buyer asks Sellers to cure an Environmental Defect, and
if the aggregate amount of all such Environmental Defects exceeds four percent
(4%) of the Purchase Price, Sellers have the option (i) to cure the
Environmental Defect, or (ii) to exclude the Interest affected by the
Environmental Defect from this Agreement. If Sellers elect to cure the
Environmental Defect, but the cure has not been completed by Closing, the
Interest affected by the Environmental Defect shall not be conveyed to Buyer at
Closing, the Purchase Price shall be reduced by the amount allocated to such
Interest and such amount shall be deposited into the escrow account referred to
in Section 10.7. If the Environmental Defect is cured within ninety (90) days
after Closing, within five (5) days after the Environmental Defect is cured,
Sellers will convey to Buyer the Interest affected by the Environmental Defect
and the applicable amount shall be released from escrow to Sellers. If Sellers
elect to exclude the Interest affected by the Environmental Defect from this
Agreement, subject to Section 11.4 below, the Purchase Price will be reduced by
the allocated value of the Interest affected.

         11.4 Environmental Purchase Price Adjustment. Notwithstanding any
provision hereof to the contrary, there shall be no reduction in the Purchase
Price for uncured Environmental Defects unless, and only to the extent that, the
aggregate amount of such uncured Environmental Defects exceeds four percent (4%)
of the Purchase Price and then only for the amount in excess of such amount.

                                       25

<PAGE>

                                   ARTICLE 12
                        TERMINATION, DEFAULT AND REMEDIES

         12.1 Right of Termination. The Agreement and the transactions
contemplated herein may be terminated at any time at or prior to Closing:

         (i)   By Sellers, at Sellers' option, in the event any of the
               conditions set forth in Article 7 have not been satisfied as
               provided therein.

         (ii)  By Buyer, at Buyer's option, in the event any of the conditions
               set forth in Article 6 have not been satisfied as provided
               therein.

         (iii) By either Party in the event that the adjustments to the Purchase
               Price exceed the Termination Amount, as provided for in Section
               10.10.

         (iv)  At any time by the mutual written agreement of the Parties.

         12.2 Effect of Termination. In the event of the termination of this
Agreement by Sellers pursuant to Section 12.1 (i) hereof due to Buyer's failure
to meet a condition of Closing, Sellers may terminate this Agreement whereupon
Castle shall retain the Earnest Money Deposits and any accrued interest thereon
which shall be Castle's sole remedy, and whereupon Buyer shall issue to BWAB the
Stock Penalty which shall be BWAB's sole remedy; provided, however, that the
rights of Sellers set forth in the Registration Rights Agreements with respect
to registration of the shares of Buyer's Stock received by Sellers under the
Stock Deposit and the Stock Penalty, as well as the representations made by
Sellers in the Investment Representation Agreements, shall survive such
termination. In the event Buyer terminates this Agreement pursuant to Section
12.1 (ii) hereof due to Sellers' failure to meet a condition of Closing, Buyer
may pursue its rights and remedies against Sellers for Sellers' breach of this
Agreement and receive back the Earnest Money Deposits, with accrued interest. In
the event of the termination of this Agreement pursuant to either Section 12.1
(iii) or (iv) hereof, the termination shall be without penalty and the Parties
shall have no further obligations to, nor rights against, one another, except
that Sellers shall return the Earnest Money Deposits to Buyer, with accrued
interest.

         12.3 Dispute Resolution. If the Parties disagree as to the cause for
termination, they will first attempt to resolve such disagreement through a
meeting, to be held within ten (10) days of such termination, of senior
executives of each party, and if such meeting fails to resolve the matter,
through a neutral arbitrator appointed by such executives within thirty (30)
days of the date of such meeting.

                                       26
<PAGE>

         12.4 Return of Documentation. Upon termination of this Agreement, Buyer
shall return to Sellers all title, geological data, reports, contracts, and maps
and other information furnished by Sellers to Buyer and all copies thereof.

                                   ARTICLE 13
                            ASSUMPTION OF OBLIGATIONS

         13.1 Assumption of Obligations. At Closing, Buyer shall assume (a) the
obligation to (i) plug and abandon or remove and dispose of all Wells (whether
then producing or temporarily or permanently abandoned), platforms, structures,
flow lines, pipelines, and the other equipment now or hereafter located on the
Interests; (ii) cap and bury all flow lines and (iii) dispose of other pipelines
now or hereafter located on the Interests, and all other pollutants, wastes,
contaminants, or hazardous, extremely hazardous, or toxic materials, substances,
chemicals or wastes now or hereafter located on the Interests; (b) all
obligations and liabilities arising from or in connection with any gas
production, pipeline, storage, processing or other imbalance attributable to
substances produced from the Interests on or after the Effective Time; and (c)
all other costs, obligations and liabilities that relate to the Interests and,
in each case, arise from or relate to events occurring on or after the Effective
Time. All such plugging, replugging, abandonment, removal, disposal, and
restoration operations shall be in compliance with applicable laws and
regulations and contracts, and shall be conducted in a good and workmanlike
manner.

                                   ARTICLE 14
                                  MISCELLANEOUS

         14.1 Fees and Taxes. Except as otherwise specifically provided, all
fees, costs and expense incurred by Buyer or Sellers in negotiating this
Agreement or in consummating the transactions contemplated by this Agreement
shall be paid by the Party incurring the same, including, without limitation,
legal and accounting fees, costs and expenses. All required documentary, filing
and recording fees for the assignments, conveyance or other instruments required
to convey title to the Interests to Buyer shall be borne by Buyer. In addition,
the liability for any sales, use, transfer or similar tax associated with the
sale and/or transfer of the Interests shall be the liability of, and for the
account of, the Buyer and such liability shall not be subject to proration as
provided in Section 2.3.

         14.2 Notices. All notices and communications required or permitted
under this Agreement shall be in writing and shall be deemed to have been duly
made when actually delivered, including delivery by courier, facsimile,
telecopy, or other electronic medium, or if mailed by registered to certified
mail, postage prepaid, addressed as follows:

                                       27
<PAGE>

SELLERS:

CASTLE OFFSHORE, L.L.C.
One Radnor Corporate Center, Suite 250
100 Matsonford Road
Radnor, Pennsylvania  19087
Attn: Richard E. Staedtler
Chief Financial Officer
Telephone:  (610) 995-9400
Facsimile:  (610) 995-0409

BWAB LIMITED LIABILITY COMPANY
Suite 1390
475 Seventeenth Street
Denver, Colorado 80202
Attn: Steven A. Roitman
Manager
Telephone:  (303) 295-7444
Facsimile:  (303) 294-9878

BUYER:

DELTA PETROLEUM CORPORATION
555 17th Street, Suite 3310
Denver, Colorado 80202
Attn: Roger Parker
Chief Executive Officer
Telephone:  (303) 293-9133
Facsimile:  (303) 298-8251

         Either Party may, by written notice so delivered to the other, change
the address to which delivery shall thereafter be made.

         14.3 Amendments. This Agreement may not be amended except by an
instrument in writing signed by Buyer and Sellers.

         14.4 Preparation of Agreement. Both Sellers and Buyer and their
respective counsel participated in the preparation of this Agreement. In the
event of any ambiguity in this Agreement, no presumption shall arise based on
the identity of the draftsman of this Agreement.

                                       28

<PAGE>

         14.5 Headings. The headings of the articles and sections of this
Agreement are for guidance and convenience of reference only and shall not limit
or otherwise affect any of the terms or provisions of this Agreement.

         14.6 Counterparts. This Agreement may be executed by Buyer and Sellers
in any number of counterparts, each of which shall be deemed an original
instrument, but all of which together shall constitute but one and the same
instrument.

         14.7 References. References made in this Agreement, including use of a
pronoun, shall be deemed to include, where applicable, masculine, feminine,
singular or plural, individuals or corporations. As used in this Agreement,
"person" shall mean any natural person, corporation, partnership, trust, estate
or other entity.

         14.8 Governing Law. This Agreement and the transactions contemplated
hereby shall be construed in accordance with, and governed by, the laws of the
State of Colorado without giving effect to the conflicts of law rules thereof.
Any disputes concerning this Agreement or the subject matter hereof shall be
brought in a court of competent jurisdiction of the State of Colorado.

         14.9 Entire Agreement. This Agreement (including the Exhibits hereto)
constitutes the entire understanding between the Parties with respect to the
subject matter hereof, superseding all negotiations, prior discussions and prior
agreements and understanding relating to such subject matter.

         14.10 Assignment; Parties in Interest. Neither Party shall assign this
Agreement without the other Party's prior written consent; provided, however,
that this requirement shall not apply to a subsidiary or other affiliate of the
assigning Party so long as the assigning Party remains responsible for its
assignee's obligations hereunder. Subject to the foregoing, this Agreement shall
be binding upon, and shall inure to the benefit of, the Parties and their
respective successors and assigns.

         14.11 Further Cooperation. After the Closing, Buyer and Sellers shall
execute and deliver, or shall caused to be executed and delivered from time to
time, such further instruments of conveyance and transfer and shall take such
other action as any Party may reasonably request to convey and deliver the
Interests to Buyer, to accomplish the orderly transfer of the Interests to
Buyer, or to otherwise effectuate the transactions contemplated by this
Agreement. If either Party hereto receives monies belonging to the other, such
amount shall immediately be paid over to the proper Party. If an invoice or
other evidence of an obligation is received by a Party, which is partially an
obligation of both Sellers and Buyer, then the Parties shall consult with each
other and each shall promptly pay its portion of such obligation to the obligee.

                                       29

<PAGE>

         14.12. Press Release. Neither Party shall make any press release or
other announcement in connection with the execution of this Agreement or the
Closing without first consulting with the other Party. Following such
consultation and good faith attempt to make reasonable accommodations, either
Party may make any announcement or press release that it believes is either
required by applicable law or the rules of any stock exchange, or is advisable
in connection with such Party's obligation to provide public disclosure
regarding its activities. This provision shall not apply to any filing with any
governmental body or stock exchange required by law, rule or regulation.

         14.13 Subrogation. Buyer shall be subrogated to all rights, actions and
warranties that Sellers may have with respect to Sellers'
predecessors-in-interest as to the Interests.

         EXECUTED as of the date first above stated, but made effective as of
the Effective Time.

                                    SELLERS:

                                    CASTLE OFFSHORE, L.L.C.

                                    By  /s/ Richard E. Staedtler
                                        ----------------------------------------
                                            Richard E. Staedtler
                                            Chief Financial Officer

                                    BWAB LIMITED LIABILITY COMPANY

                                    By  /s/ Steven A. Roitman
                                        ----------------------------------------
                                            Steven A. Roitman
                                            Manager

                                    BUYER:

                                    DELTA PETROLEUM CORPORATION

                                    By  /s/ Aleron H. Larson, Jr.
                                        ----------------------------------------
                                            Aleron H. Larson, Jr.
                                            Chief Executive Officer/Chairman

                                       30

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