Document:

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                                                                  EXHIBIT 10.16

                   NON-QUALIFIED STOCK OPTION AWARD AGREEMENT
                      UNDER THE 1989 STOCK INCENTIVE PLAN

                                October 27, 1999

Leo F. Mullin
President and Chief Executive Officer

         The 1989 Stock Incentive Plan, as amended (the "Plan"), is a
stock-based incentive compensation plan for officers and key employees of Delta
Air Lines, Inc. (the "Company") and its Subsidiaries. The Plan is administered
by the Personnel & Compensation Committee of the Company's Board of Directors
(the "Committee"). The Committee has selected you to receive an award of a
Non-Qualified Stock Option under Section 5 of the Plan, effective as of October
27, 1999, and has requested me, on behalf of the Company, to provide this
Agreement to you.

         In consideration of the mutual covenants herein contained and for
other good and valuable consideration, the Company and you, as an employee of
the Company or one or more of its Subsidiaries, hereby agree as follows:

1.       Grant of Award; Acknowledgments; Capitalized Terms. The Company hereby
grants to you a Non-Qualified Stock Option ("Stock Option") covering 500,000
shares (the "Option Shares") of Stock, as defined in the Plan, a copy of which
has been provided to you. This award is in all respects made subject to the
terms and conditions of the Plan and, in the event of any conflict between the
Plan and this Agreement, the Plan shall control. You acknowledge that you (a)
have had a full and adequate opportunity to read this Agreement and the Plan;
(b) agree to all of the terms and conditions thereof for yourself, any
designated beneficiary and your heirs, executors, administrators or personal
representatives; and (c) have received, and had a full and adequate opportunity
to read, the Prospectus relating to the Plan. Capitalized terms which are used
but not defined in this Agreement shall have the meanings set forth in the
Plan.

2.       Option Price. The Option Price of the Stock Option covered by this
award shall be $49.9375, the closing price of the Stock on the New York Stock
Exchange on October 27, 1999, the date of this award.

3.       Exercise Period - General Rule. Subject to the terms and conditions of
the Plan and this Agreement, the Stock Option (a) shall become exercisable with
respect to 100% of the Option Shares on October 27, 2004; and (b) shall be
exercisable through and including October 26, 2009.

  This document constitutes part of a prospectus covering securities that have
               been registered under the Securities Act of 1933.

<PAGE>   2

4.       Special Rules Regarding Stock Option Exercise Period. The Stock Option
exercise period set forth in Paragraph 3 of this Agreement is subject to the
following terms and conditions (which shall apply in lieu of the provisions of
Section 10 of the Plan):

         a.       Termination of Employment Prior to October 27, 2004 Because
of Disability or Death. If your employment with the Company terminates prior to
October 27, 2004 due to Disability or death (such termination date is defined
as the "Employment Termination Date"), the Stock Option (i) may be exercised,
to the extent not previously forfeited, revoked or modified, with respect to
25% of the Option Shares for each full year which shall have elapsed between
October 27, 1999 and the Employment Termination Date (but not to exceed 100% of
the Option Shares), but only during the period (A) beginning on the Employment
Termination Date and (B) ending on and including the third anniversary of the
Employment Termination Date; and (ii) shall otherwise be forfeited on the
Employment Termination Date.

         b.       Termination of Employment Prior to October 27, 2004 for
Reasons Other than Disability or Death. If your employment with the Company
terminates prior to October 27, 2004 for any reason, including Retirement,
other than due to Disability or death, the Stock Option shall be forfeited at
the time of such termination of employment.

         c.       Termination of Employment On or After October 27, 2004
Because of Retirement, Disability or Death. If your employment with the Company
terminates on or after October 27, 2004 due to Retirement, Disability or death,
the Stock Option may be exercised, in whole or in part, to the extent not
previously exercised, forfeited, revoked or modified, only during the period
(i) beginning on the date your employment with the Company terminates due to
Retirement, Disability or death; and (ii) ending on and including the earlier
of (A) October 26, 2009 or (B) the third anniversary of the date your
employment with the Company terminates due to Retirement, Disability or death.

         d.       Termination of Employment On or After October 27, 2004 for
Reasons Other than Retirement, Disability or Death. If your employment with the
Company terminates on or after October 27, 2004 for any reason other than
Retirement, Disability or death, the Stock Option, to the extent not previously
exercised, shall be forfeited at the time of such termination of employment.

         e.       Definitions. For purposes of Paragraphs 4 and 8 of this
Agreement, (i) employment with the Company includes employment with any
Subsidiary of the Company; and (ii) termination of employment with the Company
means you are no longer an employee of the Company or any of its Subsidiaries.

5.       Stock Option Exercise Procedures. Subject to the terms and conditions
of the Plan and this Agreement, you (or, pursuant to Paragraph 7 of this
Agreement, a party acting on your behalf after your death) may exercise the
Stock Option in whole or, from time to time, in part by way of a written notice
delivered to the Corporate Secretary of the Company which includes the
following: (i) your name, mailing address and social security number and the
date of the notice; (ii) the number of shares of Stock with respect to which
the Stock Option is being exercised; (iii) the date of grant and the Option
Price with respect to the Stock Option being exercised; and (iv) the signature
of you or a party acting on your behalf after your death. Payment of the full

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purchase price of the shares of Stock covered by the exercise shall be made in
the manner prescribed by the Committee from time to time. If the Committee, in
its sole discretion, shall determine that it is appropriate to do so, such
payment may be made in whole or in part by tender of shares of unrestricted
Stock, as set forth in Section 5 of the Plan, subject to such requirements or
procedures as the Committee may specify.

6.       Tax Withholding. When the Stock Option is exercised, the Company shall
make the appropriate calculations under the Plan and deliver to you, as soon as
practicable, a certificate or certificates representing the net number of
shares of Stock due to you pursuant to such exercise, calculated in accordance
with this paragraph. The Company shall withhold from the shares of Stock issued
to you a sufficient number of shares of Stock based on its fair market value on
the date of exercise to cover any amounts which the Company is required to
withhold to comply with withholding requirements of federal, state, local or
foreign tax laws, rules or regulations. The fair market value for purposes of
the second sentence of this paragraph shall be as determined by the Committee.

7.       Restrictions on Transferability. The Stock Option is not transferable
otherwise than by will, by the laws of descent and distribution, or by a
written designation referred to in Section 10(c) of the Plan, and is
exercisable during your lifetime only by you. In the event that the Stock
Option is to be exercised by any person other than you, the written notice
referred to in Paragraph 5 of this Agreement shall be accompanied by
appropriate proof of the right of such person to exercise the Stock Option.

8.       Forfeiture, Revocation or Modification of Award. In addition to
Paragraphs 4(a), 4(b) and 4(d) of this Agreement (and in lieu of the provisions
of Section 10 of the Plan), the Stock Option shall be subject to forfeiture,
revocation or modification as follows:

         a.       Non-Competition Agreement After Early Retirement. If your
employment with the Company terminates on or after October 27, 2004 due to
Retirement prior to your normal retirement date (as determined under the
retirement or pension plan of the Company or its Subsidiary applicable to you)
and, within two years after your early Retirement and without the Committee's
approval, you directly or indirectly provide management or executive services
(whether as a consultant, advisor, officer or director) to any Person who is in
direct and substantial competition with the air transportation business of the
Company or its Subsidiaries, the Stock Option shall be forfeited at the time
you first provide such management or executive services. Because of the broad
and extensive scope of the Company's air transportation business, you
acknowledge that the restrictions in this paragraph are intended to extend to
management or executive services which are directly related to the provision of
air transportation services into, within or from the United States, as no
smaller geographical restriction will adequately protect the legitimate
business interests of the Company.

         b.       Demotion. If, prior to October 27, 2004, you voluntarily
suggest and then accept a demotion, or are involuntarily demoted, to a position
with the Company involving lesser responsibilities than those of the job held
by you on October 27, 1999, the Committee may in its sole discretion, not later
than six months from the date of the demotion, revoke or modify the Stock
Option in any manner it deems appropriate under the circumstances. The
Committee will

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determine in its sole discretion what constitutes a demotion to a job involving
lesser responsibilities under this paragraph.

9.       Federal Securities Law; Company Policies. You acknowledge that the
federal securities laws and/or the Company's policies regarding trading in its
securities may limit or restrict your right to buy or sell shares of Stock,
including, without limitation, sales of Stock to exercise the Stock Option or
sales of Stock acquired pursuant to the exercise of the Stock Option. You agree
to comply with such federal securities law requirements and Company policies,
as such laws and policies are amended from time to time.

10.      Miscellaneous

         a.       Authority of the Committee. The Committee has the sole and
complete authority to construe and interpret the Plan and this Agreement. All
determinations of the Committee shall be final and conclusive for all purposes
and upon all persons. The Committee shall be under no obligation to construe
this Agreement or treat the Stock Option in a manner consistent with the
treatment provided with respect to other Stock Options or Participants.

         b.       No Rights as Shareholder. You will not have any rights to
dividends nor any other rights of a shareholder with respect to the Option
Shares until the Option Shares have been issued following a valid exercise of
the Stock Option.

         c.       Entire Agreement. Subject to any written employment or
executive retention protection agreement, if any, entered into between and
executed by you and the Company, this Agreement and the Plan constitute the
entire agreement between you and the Company with respect to the subject matter
hereof. This Agreement may not be amended except by a writing signed by the
parties.

         This Agreement has been prepared in duplicate. Please note your
acceptance in the space provided therefor and return one original to the
Corporate Secretary for the Company's records.

         IN WITNESS WHEREOF, the Company, acting through the Committee, and you
have executed this Agreement, all as of the date first written above.

                              DELTA AIR LINES, INC.

                              By:
                                  ----------------------------------------------
                                  Edward H. Budd
                                  Member, Personnel & Compensation Committee

                              PARTICIPANT

                              --------------------------------------------------

lpk/worddoc/Stock Incentive Plan/Mullin, Leo/stock option award agreement.doc
10/27/99

                                       4LICENSE AGREEMENT

     This License Agreement (the "Agreement") is by and among the following
Parties:

          Inventor:         Ron Salestrom
                            P.O. Box 300
                            Wilcox, Arizona 85644

          Licensee:         American Soil Technologies, Inc.
                            215 North Marengo Avenue
                            Suite 110
                            Pasadena, California 91101

          Polymers Plus:    Polymers Plus, L.L.C.
                            c/o Ron Salestrom
                            P.O. Box 300
                            Wilcox, Arizona 85644

and shall be effective on and as of January 4, 2000. Inventor and Licensee are
referred to herein as the "Parties." For and in consideration of the Employment
Contract and Royalties referred to herein, Parties agree as follows:

     1. The Invention. Inventor has invented, conceived, developed and reduced
to practice a certain invention relating to the use of polymers as a soil
additive. The polymers improve moisture retention of the soil and reduce
fertilizer consumption of agricultural crops. This invention is referred to in
this Agreement as the "Invention." The Invention also includes any and all
improvements, enhancements and variations of the Invention heretofore or
hereafter made or acquired by Inventor. The Invention has been patented by
Inventor. The patents (referred to herein as the "Licensed Patents") covering
the Invention are United States Patent Nos. 5,649,495 and 5,868,087.

     2. License. Inventor hereby grants to Licensee, and Licensee hereby accepts
from Inventor, an exclusive license to make, use, sell, copy, distribute, lease,
modify, improve and in any and every way commercialize the Invention (the
"License"). The License includes an exclusive license under the Licensed Patents
and any other intellectual property (e.g., trade secrets, know-how, copyrights
and trademarks) of Inventor relating to the Invention. The License includes the
right to grant sublicenses without approval of the Inventor, on any terms deemed
necessary or proper by Licensee, subject only the terms of this Agreement. The
scope of the License includes the United States of America and all foreign
countries and is not geographically limited. The term of the License if for the
life of the Licensed Patents plus, in the case of the other intellectual
property described above that is not covered by the Licensed Patents, ten years.

     3. New Patent Applications. Whenever it deems it necessary or proper to do
so, Licensee shall be entitled to cause a patent application relating to any new
aspects or otherwise unpatented aspects of the Invention to be prepared and
filed with the United States Patent and Trademark Office ("Patent
Applications"). Each Patent Application shall be filed in Inventor's name as the
inventor. Licensee shall control and direct the preparation and prosecution of
all Patent Applications through Licensee's patent counsel and shall pay for the
costs and expenses of each Patent Application. Inventor shall fully and
completely cooperate with Licensee in the preparation, filing and prosecution of
any Patent Application. This Section 3 shall also apply to any and all
continuation, continuation-in-part, divisional and reissue patent applications
which, in whole or in part or directly or indirectly, are based upon or claim
any priority from the Licensed Patents or any Patent Application. The decision
to file any such continuation, continuation-in-part, divisional or reissue
patent application shall rest solely with Licensee.
<PAGE>
     4. Improvements. Licensee may file with the United States Patent and
Trademark Office additional patent applications claiming any improvement,
enhancement or variation of the Invention. Licensee shall control and direct the
preparation and prosecution of such patent applications through Licensee's
patent counsel and shall pay for the costs and expenses of such patent
applications. Inventor shall cooperate with Licensee in the preparation, filing
and prosecution of such patent applications. Ownership of such patent
applications and any patents issuing therefrom shall be in the name of Inventor.

     5. Foreign Patent Applications. Licensee may file in any foreign countries
patent applications claiming the Invention, including any improvements,
enhancements or variations thereof. Licensee shall control and direct the
preparation and prosecution of such patent applications through Licensee's
patent counsel and shall pay for the costs and expenses of such patent
applications. Inventor shall cooperate with Licensee in the preparation, filing
and prosecution of such patent applications. Ownership of such foreign patent
applications and any foreign patents issuing therefrom shall be in the name of
Inventor but subject to this Agreement. The provisions of this Section 5 apply
to any existing foreign patent applications that have been made by Inventor
prior to the date of this Agreement.

     6. Declined Applications. If Licensee decline to file a patent application
within the scope of Section 5 or 6 above, Inventor may do so at his cost and
expense. In such event, any patent issuing from the application declined by
Licensee shall not be deemed a Licensed Patent or included within the License.
Licensee shall have no obligation or responsibility with respect to such
declined application or declined patent.

     7. Abandonment of Applications. Licensee may abandon or otherwise cease to
prosecute or maintain any patent application within the scope of Sections 4, 5
or 6. Prior to such abandonment, Licensee shall give notice of its intent to
abandon to Inventor and Inventor may, at his cost and expense, assume control of
and responsibility for the patent application in question and continue to
prosecute and maintain such application. Any patent issuing from an application
abandoned by Licensee shall not be deemed a Licensed Patent or included within
the License. Licensee shall have no obligation or responsibility with respect to
any such application abandoned by them.

     8. Licensed Patents. As used in this Agreement the term "Licensed Patents"
shall mean any and all patents described above as Licensed Patents, together
with any patents issuing from any patent application within the scope of
Sections 4, 5 or 6 above. Ownership of all Licensed Patents shall be in the name
of Inventor but subject in all respects to the terms of this Agreement.

     9. Enforcement. In the event that any third party infringes any Licensed
Patent or any right licensed to Licensee under this Agreement, Licensee is
authorized to bring suit against such third party in the names of Inventor and
Licensee and to settle any such suit or infringement. Licensee shall bear all
costs and expenses incurred in connection therewith and shall be entitled to
receive and retain any damages or other amounts awarded in such suit or obtained
through settlement.

     10. Cooperation. Inventor shall cooperate fully with Licensee in the
protection and enforcement of Licensee's rights in and to the Invention and the
Licensed Patents. Without limiting the foregoing sentence, Inventor shall:

     11. fully and completely disclose the Invention, and facts relating to the
Invention, to Licensee;

     12. promptly disclose all improvements, enhancements and variations of the
Invention to Licensee after they are made or acquired by Inventor;

     13. upon Licensee's request, execute a separate writing confirming and/or
expressing in more specific language the license of any improvement, enhancement
or variation hereunder;

                                        2
<PAGE>
     14. upon Licensee's request, sign all papers, make all rightful oaths and
do all requisite acts necessary or useful in obtaining, enforcing, sublicensing
or protecting any patent or patents to the Invention in the United States or in
any foreign country; and

     15. fully cooperate with Licensee in every lawful way in any and every
legal proceeding involving the Invention or the Licensed Patents in the United
States or in any foreign country.

     16. Warranty. Inventor hereby represents and warrants to Licensee that:

     17. Inventor conceived the Invention;

     18. Inventor is the actual and rightful owner of the Invention and all
patent rights and other intellectual property law rights therein;

     19. no other person or entity has any rights, interest or title in or to
the Invention (including patent rights thereto); 20. the Invention (including
patent rights thereto) is not subject to any mortgage, lien, encumbrance or
defect in title;

     21. Inventor has not entered into any license, obligation, assignment,
contract or understanding in conflict with this Agreement, other than that
certain Exclusive International License Agreement dated August 4, 1998, between
Polymers Plus and Inventor, covering United States Patent Nos. 5,649,495, and
that certain Exclusive International License Agreement dated May 7, 1999,
between Polymers Plus and Inventor, covering United States Patent Nos.
5,868,087, both of which Exclusive International License Agreements are hereby
terminated and replaced and superceded in their entirety by the provisions of
this Agreement; and

     22. the Invention and the Licensed Patents are not subject to any dispute,
arbitration or litigation.

     23. Royalties. Licensee shall pay to Inventor the below-described "Sales
Royalty." The Sales Royalty shall be equal to One and One-Half Percent (1.5%) of
the net sales received by Licensee as a result of Licensee's ownership of the
License under this Agreement. Sales Royalties shall be paid on a calendar
quarterly basis to Inventor and shall be due within 45 days of the end of each
quarter. Calendar quarters end on the last days of March, June, September and
December. Repayment of the Promissory Note executed by Inventor shall be deemed
as payment as referred to herein.

     24. Minimum Royalties. No minimum Sales Royalties shall be due Inventor
under this Agreement.

     25. Right to Surrender License. Licensee may elect at any time to surrender
the License by giving written notice thereof to Inventor. Upon surrender of the
License, the License and this Agreement shall terminate and neither Party shall
have any further obligation to the other under this Agreement. Sales Royalties
accrued prior to such surrender shall remain payable by Licensee to Inventor.
Any sublicenses granted by Licensee under the License prior to the surrender
shall remain in effect but Inventor shall receive 100% (rather than 20%) of the
sublicense fees and revenues from and after the date of any surrender by
Licensee of the License.

     26. Manufacture of Prototypes. Inventor shall make and give to Licensee the
as many prototypes of the Invention as are reasonably requested by Licensee.

     27. Confidentiality. Inventor understands and agrees that the Invention is
confidential and secret and that Inventor shall respect and protect the
confidentiality and secrecy of the Invention. Except as authorized in writing by
Licensee, Inventor agrees not to:

     28. directly or indirectly disclose, report, reveal, publish or transfer to
any other person or entity the Invention, any aspect or part thereof, or any
information relating thereto;

     29. directly or indirectly aid, encourage or allow any other person or
entity to gain possession of or access to any material or other tangible object
embodying any information relating to the Invention or any aspect or part
thereof; and

                                        3
<PAGE>
     30. directly or indirectly use, sell or exploit the Invention, any aspect
or part thereof, or any information relating thereto or aid, encourage, or allow
any other person or entity to use, sell or exploit the Invention, any aspect or
part thereof, or any information relating thereto.

     Inventor's obligations under this Section shall not apply to anything that
Inventor can clearly establish is publicly known or generally employed in the
relevant industry through no fault of Inventor. If not already submitted to
Licensee, Inventor shall promptly submit to Licensee a list of all persons and
other entities to whom the Invention, any aspect or part thereof, or any
information relating thereto has been disclosed or submitted. Upon Licensee's
request Inventor shall provide to Assignee any and all information concerning
any such disclosure or submission.

     31. Noncompetition. Inventor agrees that for a period of three years
following the effective date of this Agreement, Inventor shall not, except as
Licensee may approve in writing, engage in any employment or activity in or for
any business which sells any goods or products which, now or hereafter, compete
with the Invention.

     32. Injunctive Relief. Inventor agrees that a breach by Inventor of any
obligation of Inventor under this Agreement may cause Licensee immediate and
irreparable harm which may not be adequately compensated by monetary damages
alone. Accordingly, in the event of a breach or threatened breach by Inventor,
Licensee shall be entitled to preliminary and permanent injunctive and other
equitable relief in addition to such other remedies as may be available to
Licensee for such breach or threatened breach, including the recovery of
damages.

     33. Assignment. Licensee may assign this Agreement and the License to any
third party assignee who agrees to be bound by this Agreement in the same manner
as Licensee is bound hereby. Such assignment shall include an assignment of
rights and a delegation of duties and obligations under the Agreement to the
assignee. After such assignment and delegation, Licensee shall have no further
obligation under the Agreement. This Agreement is personal to Inventor and may
not be assigned by Inventor.

     34. Breach. If either Party fails to perform any obligation under this
Agreement, said Party shall not be in breach or default of this Agreement unless
the other Party gives notice thereof to the Party and the Party fails to cure
the nonperformance within 30 days of receipt of such notice. The non performing
party shall have 90 days from said date in which to completely cure said Breach.
Upon Breach, Inventor shall be entitled to terminate this agreement without
further notice.

     35. Licensee's Inventions. This Agreement shall not apply to any inventions
(including improvements, enhancements and variations) made by Licensee.

     36. Relationship. Inventor is not an agent, employee, partner, joint
venturer or representative of Licensee.

     37. Headings. The headings used in this Agreement are inserted for
reference purposes only and shall not be deemed to limit or affect in any way
the meaning or interpretation of any of the terms or provisions herein.

     38. Entire Agreement. This Agreement constitutes the entire understanding
and agreement between the Parties and supersedes all prior agreements,
representations or understandings between the Parties relating to the subject
matter thereof.

     39. Severability. If any provision in this Agreement is invalid or
unenforceable, such invalid or unenforceable provision shall be construed,
limited and narrowed as necessary (or severed if necessary) to eliminate the
invalidity or unenforceability of the provision and the other provisions of this
Agreement shall not be affected thereby.

     40. Modification. This Agreement may not be rescinded or modified except by
an instrument in writing signed by the Parties hereto.

                                        4
<PAGE>
     41. Governing Law. This Agreement shall be interpreted, construed, and
enforced according to the laws of the State of Arizona. The Parties agree that
any controversy and all matters of dispute arising under this Agreement or
relating to the subject matter thereof are to be resolved and, if necessary,
litigated in the State of Arizona. The Parties hereby submit to the jurisdiction
of the State of Arizona, its courts and federal courts within the State of
Arizona for the resolution of any such controversy or dispute.

     42. Notice. Any notice or communication under this Agreement shall be
addressed or delivered to the appropriate Party or to Polymers Plus at the
addresses set forth above, or to any such address as is given from time to time
by the Party or Polymers Plus to the other parties to this Agreement.

     43. Attorneys' Fees. In the event any action or proceeding is brought by
either Party or by Polymers Plus against any other party to this Agreement, the
prevailing Party shall be entitled to recover attorneys' fees and costs in such
amount as the court may adjudge reasonable.

     44. Duplicate Counterparts. This Agreement may be executed in counterparts
each of which shall be an original. Said counterparts shall form and represent
one and same agreement.

     IN WITNESS WHEREOF, the Parties and Polymers Plus have entered into this
Agreement on the dates set forth below, to be effective as of the date first set
forth above.

Date: January 4, 2000                   By: /s/ Ronald Salestrom
                                            ------------------------------------
                                            RONALD SALESTROM, Employee

CONSENTED TO BY KATHY SALESTROM, THE SPOUSE OF RONALD SALESTROM:

Date: January 5, 2000                   By: /s/ Kathy Salestrom
                                            ------------------------------------
                                            KATHY SALESTROM

Date: January 4, 2000                   AMERICAN SOIL TECHNOLOGIES, INC.,
                                        a Nevada corporation

                                        By: /s/ Neil C. Kitchen
                                            ------------------------------------
                                        Name: Neil C. Kitchen
                                              ----------------------------------
                                        Title: President
                                               ---------------------------------

                                        POLYMERS PLUS, L.L.C., an Arizona
                                        limited liability company

Date: January 4, 2000                   By: /s/ Ron Salestrom
                                            ------------------------------------
                                        Name: Ron Salestrom
                                              ----------------------------------
                                        Title: President
                                               ---------------------------------

                                        5

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