Document:

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                                                                   EXHIBIT 10.26

                          REGISTRATION RIGHTS AGREEMENT

         This Registration Rights Agreement (the "Agreement") is entered into as
of December 21, 2000 by and among Tetra Tech, Inc., a Delaware corporation
("Tetra Tech"), and the parties listed on Schedule A attached hereto (each, a
"Holder" and collectively, the "Holders").

                                 R E C I T A L S

         A. Tetra Tech and the Holders are parties to the Agreement and Plan of
Reorganization of even date (the "Reorganization Agreement"), pursuant to which
Rocky Mountain Consultants, Inc., a Colorado corporation ("RMC"), will merge
with and into TDH Acquisition Corporation, a Delaware corporation and
wholly-owned subsidiary of Tetra Tech.

         B. Pursuant to the Reorganization Agreement, the shareholders of RMC
will receive shares of the common stock, $.01 par value, of Tetra Tech ("Tetra
Tech Common Stock"); and

         C. This Agreement is the Registration Rights Agreement referred to in
SECTION 6.2 of the Reorganization Agreement and, pursuant thereto, must be
entered into by the parties in connection with the consummation of the
transactions contemplated by the Reorganization Agreement.

                                A G R E E M E N T

         NOW, THEREFORE, in consideration of the mutual covenants and agreements
contained herein, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

         1. CERTAIN DEFINITIONS. As used in this Agreement, the following terms
shall have the following respective meanings:

            "EXCHANGE ACT" shall mean the Securities Exchange Act of 1934, as
amended from time to time.

            "FORM S-3" shall mean such form under the Securities Act as in
effect on the date hereof or any successor registration form under the
Securities Act subsequently adopted by the SEC which permits inclusion or
incorporation of substantial information by reference to other documents filed
by Tetra Tech with the SEC.

            "PROSPECTUS" shall mean the prospectus included in any Registration
Statement, as amended or supplemented by any prospectus supplement, with respect
to the terms of the offering of any portion of the Registrable Securities
covered by the Registration Statement and by all other amendments and
supplements to the prospectus, including post-effective amendments and all
material incorporated by reference in such Prospectus.

            "REGISTER", "REGISTERED" and "REGISTRATION" shall mean and refer to
a registration effected by preparing and filing a Registration Statement and
taking all other actions that are necessary or appropriate in connection
therewith, and the declaration or ordering of effectiveness of such Registration
Statement by the SEC.

            "REGISTRATION EXPENSES" shall have the meaning set forth in
SECTION 4.

            "REGISTRABLE SECURITIES" shall mean the shares of Tetra Tech Common
Stock (i) issued pursuant to the Reorganization Agreement, and (ii) issued as a
dividend or other distribution with respect to or in exchange for or in
replacement of the shares referenced in (i) above; provided, however, that
Registrable Securities shall not include any shares of Tetra Tech Common Stock
that have previously been registered or sold to the public or have been sold
pursuant to Rule 144 ( or similar successor Rule).

            "REGISTRATION STATEMENT" shall mean any registration statement of
Tetra Tech in compliance with the Securities Act that covers Registrable
Securities pursuant to the provisions of this Agreement, including, without
limitation, the Prospectus, all amendments and supplements to such Registration
Statement, including all post-effective amendments, all exhibits and all
material incorporated by reference in such Registration Statement.

            "RULE 144" shall mean Rule 144 promulgated under the Securities Act
or any similar successor rule, as the same shall be in effect from time to time.

            "RULE 144A" shall mean Rule 144A promulgated under the Securities
Act or any similar successor rule, as the same shall be in effect from time to
time.

            "RULE 415" shall mean Rule 415 promulgated under the Securities Act,
or any similar successor rule, as the same shall be in effect from time to time.

            "SECURITIES ACT" shall mean the Securities Act of 1933, as amended
from time to time.

            "SEC" shall mean the Securities and Exchange Commission.

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            "UNDERWRITTEN OFFERING" shall mean a registration in which
securities of Tetra Tech are sold to an underwriter or through an underwriter as
agent for reoffering to the public.

         2. REGISTRATION FOR HOLDERS.

            (a) Tetra Tech shall file a Registration Statement on Form S-3,
providing for the sale by the Holders, pursuant to Rule 415, and/or any similar
rule that may be adopted by the SEC, of the Registrable Securities. Tetra Tech
shall use commercially reasonable efforts to cause such Registration Statement
to become effective on or before January 21, 2001, subject to review by the SEC,
and to keep such Registration Statement continuously effective for a period
ending on the date on which all such Holders are eligible to sell Registrable
Securities under Rule 144 (or similar successor rule) without any volume
limitation. Tetra Tech represents and warrants that it is currently eligible to
file a Registration Statement on Form S-3. However, if, at the time Tetra Tech
is required to file a Registration Statement pursuant to this SECTION 3(a),
Tetra Tech is not eligible to file a Registration Statement on Form S-3 to
register resales by stockholders, Tetra Tech shall initially file a Registration
Statement on Form S-1 and shall comply with the provisions of the immediately
preceding sentence. Upon becoming eligible to use the Registration Statement on
Form S-3 to register resales by stockholders (whether pursuant to a ruling or
waiver from the SEC or otherwise), Tetra Tech shall promptly file a Registration
Statement on Form S-3 or convert the existing Registration Statement to Form S-3
relating to the offer and sale of Registrable Securities by the Holders from
time to time. Thereafter, Tetra Tech shall use commercially reasonable efforts
to cause such new or amended Registration Statement to be declared effective by
the SEC as promptly as practicable.

            (b) No Holder shall have the right to register securities under this
Agreement unless such Holder provides and/or confirms in writing prior to or
after the filing of the Registration Statement such information (including,
without limitation, information as to the number of Registrable Securities that
such Holder has sold pursuant to any such Registration Statement from time to
time) as Tetra Tech reasonably requests in connection with such Registration
Statement.

            (c) Notwithstanding the foregoing, for a period not to exceed 90
days, Tetra Tech shall not be obligated to prepare and file the Registration
Statement required hereunder if Tetra Tech, in its good faith judgment,
reasonably believes that the filing of such Registration Statement would require
the disclosure of material non-public information regarding Tetra Tech and,
accordingly, that the filing thereof, at the time requested, or the offering of
Tetra Tech Common Stock pursuant thereto, would materially and adversely affect
(i) a pending or scheduled public offering or private placement of securities of
Tetra Tech, (ii) an acquisition, merger, consolidation or similar transaction by
or of Tetra Tech, (iii) preexisting and continuing negotiations, discussions or
pending proposals with respect to any of the foregoing transactions, or (iv) the
financial condition of Tetra Tech in view of the disclosure of any pending or

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threatened litigation, claim, assessment or governmental investigation which
might be required thereby.

         In the event that Tetra Tech, in good faith, reasonably believes that
such conditions are continuing after such 90-day period, it may, with the
consent of the Holders of a majority of the Registrable Securities subject (or
to be subject) to the Registration Statement, which consent shall not be
unreasonably withheld, extend such 90-day period for an additional 30 days. Any
further delay shall require the consent of the Holders of all such shares.

         In the event of any delay in the filing of the Registration Statement
pursuant to this subparagraph (c), Tetra Tech will effect such filing as soon as
practicable.

         3. REGISTRATION PROCEDURES. In connection with Tetra Tech's
registration obligations pursuant to SECTION 2 hereof, Tetra Tech will use
commercially reasonable efforts to effect such registration to permit the sale
of the Registrable Securities covered thereby in accordance with the intended
method or methods of disposition thereof, and pursuant thereto Tetra Tech will:

            (a) prepare and file with the SEC a Registration Statement with
respect to such Registrable Securities and use its commercially reasonable
efforts to cause such Registration Statement to become effective; PROVIDED that,
before filing any Registration Statement or Prospectus or any amendments or
supplements thereto, Tetra Tech will furnish to the Holders of the Registrable
Securities covered by such Registration Statement and their counsel, copies of
all such documents proposed to be filed at least ten days prior thereto, and
Tetra Tech will not file any such Registration Statement or amendment thereto or
any Prospectus or any supplement thereto to which any such Holder shall
reasonably object within such ten day period; PROVIDED, FURTHER, that Tetra Tech
will not name or otherwise provide any information with respect to any Holder in
any Registration Statement or Prospectus without the express written consent of
such Holder, unless required to do so by the Securities Act and the rules and
regulations thereunder;

            (b) prepare and file with the SEC such amendments, post-effective
amendments and supplements to the Registration Statement and the Prospectus as
may be necessary to comply with the provisions of the Securities Act and the
rules and regulations thereunder with respect to the disposition of all
securities covered by such Registration Statement;

            (c) notify the selling Holders (i) when the Prospectus or any
Prospectus supplement or post-effective amendment has been filed, and, with
respect to the Registration Statement or any post-effective amendment, when the
same has become effective, (ii) of any request by the SEC for amendments or
supplements to the Registration Statement or the Prospectus or for additional
information, (iii) of the issuance by the SEC of any stop order suspending the
effectiveness of the Registration Statement or the initiation of any proceedings
for that purpose, (iv) of the receipt by Tetra Tech of any notification with
respect to the suspension of the qualification of the Registrable Securities for
sale in any jurisdiction or the initiation or threatening of any proceeding for
such purpose and (v) of the happening of any event which makes any statement
made in the Registration Statement, the Prospectus or any

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document incorporated therein by reference untrue or which requires the making
of any changes in the Registration Statement, the Prospectus or any document
incorporated therein by reference in order to make the statements therein not
misleading in light of the circumstances then existing;

            (d) make every commercially reasonable effort to obtain the
withdrawal of any order suspending the effectiveness of the Registration
Statement at the earliest possible moment;

            (e) deliver to each selling Holder, without charge, such reasonable
number of conformed copies of the Registration Statement (and any post-effective
amendment thereto) and such number of copies of the Prospectus (including each
preliminary prospectus) and any amendment or supplement thereto (and any
documents incorporated by reference therein) as such Holder may reasonably
request. Tetra Tech consents to the use of the Prospectus or any amendment or
supplement thereto by each of the selling Holders in connection with the offer
and sale of the Registrable Securities covered by the Prospectus or any
amendment or supplement thereto;

            (f) prior to any offering of Registrable Securities covered by a
Registration Statement, register or qualify or cooperate with the selling
Holders in connection with the registration or qualification of such Registrable
Securities for offer and sale under the securities or blue sky laws of such
jurisdictions as any such selling Holder reasonably requests, and use
commercially reasonable efforts to keep each such registration or qualification
effective, including through new filings, or amendments or renewals, during the
period such Registration Statement is required to be kept effective pursuant to
the terms of this Agreement; and do any and all other acts or things necessary
or advisable to enable the disposition in all such jurisdictions reasonably
requested by the Holders of the Registrable Securities covered by such
Registration Statement, PROVIDED that under no circumstances shall Tetra Tech be
required in connection therewith or as a condition thereof to qualify to do
business or to file a general consent to service of process in any such states
or jurisdictions;

            (g) cooperate with the selling Holders to facilitate the timely
preparation and delivery of certificates representing Registrable Securities to
be sold, free of any and all restrictive legends, such certificates to be in
such denominations and registered in such names as the Holders may request;

            (h) upon the occurrence of any event contemplated by SECTION 3(c)(v)
above, prepare a supplement or post-effective amendment to the Registration
Statement or the Prospectus or any document incorporated therein by reference or
file any other required document so that, as thereafter delivered to the
purchasers of the Registrable Securities, the Prospectus will not contain an
untrue statement of a material fact or omit to state any material

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fact necessary to make the statements therein, in light of the circumstances
under which they were made, not misleading;

            (i) make generally available to the holders of Tetra Tech's
outstanding securities earnings statements satisfying the provisions of Section
11(a) of the Securities Act, no later than 60 days after the end of any 12 month
period (or 90 days, if such period is a fiscal year) beginning with the first
month of Tetra Tech's first fiscal quarter commencing after the effective date
of the Registration Statement, which statements shall cover said 12 month
period;

            (j) provide and cause to be maintained a transfer agent and
registrar for all Registrable Securities covered by each Registration Statement
from and after a date not later than the effective date of such Registration
Statement;

            (k) use its best efforts to cause all Registrable Securities covered
by each Registration Statement to be listed, subject to notice of issuance,
prior to the date of the first sale of such Registrable Securities pursuant to
such Registration Statement, on each securities exchange on which the Tetra Tech
Common Stock is then listed, and admitted to trading on the Nasdaq Stock Market,
if the Tetra Tech Common Stock is then admitted to trading on the Nasdaq Stock
Market; and

            (l) enter into such agreements (including underwriting agreements in
customary form containing, among other things, reasonable and customary
indemnities) and take such other actions as a majority of the Holders shall
reasonably request in order to expedite or facilitate the disposition of such
Registrable Securities; and

            (m) cooperate with the selling Holders and the managing underwriter
or underwriters in their marketing efforts with respect to the sale of the
Registrable Securities, including participation by Tetra Tech management in
"road show" presentations.

         Each Holder agrees that, upon receipt of any notice from Tetra Tech of
the happening of any event of the kind described in SECTION 3(c)(v) hereof, such
Holder will forthwith discontinue disposition of Registrable Securities under
the Prospectus related to the applicable Registration Statement until such
Holder's receipt of the copies of the supplemented or amended Prospectus
contemplated by SECTION 3(h) hereof, or until it is advised in writing by Tetra
Tech that the use of the Prospectus may be resumed.

         It shall be a condition precedent to the obligations of Tetra Tech to
take any action pursuant to this SECTION 3 with respect to the Registrable
Securities of any selling Holder that such Holder shall furnish to Tetra Tech
such information regarding itself and the Registrable Securities held by it as
shall be required by the Securities Act to effect the registration of such
Holder's Registrable Securities.

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         4. REGISTRATION EXPENSES. All expenses incident to any registration to
be effected hereunder and incident to Tetra Tech's performance of or compliance
with this Agreement, including without limitation all registration and filing
fees, fees and expenses of compliance with securities or blue sky laws, printing
expenses, messenger and delivery expenses, National Association of Securities
Dealers, Inc., stock exchange and qualification fees, fees and disbursements of
Tetra Tech's counsel and of independent certified public accountants of Tetra
Tech (including the expenses of any special audit required by or incident to
such performance), the fees and disbursements of one counsel and one accountant
representing the Holders in such offering, expenses of the underwriters that are
customarily requested in similar circumstances by such underwriters (excluding
discounts, commissions or fees of underwriters, selling brokers, dealer managers
or similar securities industry professionals relating to the distribution of the
Registrable Securities, which will be borne by the Holders), all such expenses
being herein called "Registration Expenses," will be borne by Tetra Tech. Tetra
Tech will also pay its internal expenses, the expense of any annual audit and
the fees and expenses of any person retained by Tetra Tech.

         5. INDEMNIFICATION.

            (a) INDEMNIFICATION BY TETRA TECH. Tetra Tech agrees to indemnify
and hold harmless each Holder of Registrable Securities, its officers,
directors, partners and employees and each person who controls such Holder
(within the meaning of Section 15 of the Securities Act) from and against any
and all losses, claims, damages and liabilities (including any investigation,
legal or other expenses reasonably incurred in connection with, and any amount
paid in settlement of, any action, suit or proceeding or any claim asserted)
(collectively, "Damages") to which such Holder may become subject under the
Securities Act, the Exchange Act or other federal or state securities law or
regulation, at common law or otherwise, insofar as such Damages arise out of or
are based upon (i) any untrue statement or alleged untrue statement of a
material fact contained in any Registration Statement, Prospectus or preliminary
prospectus or any amendment or supplement thereto, (ii) the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein, in light of the circumstances under
which they were made, not misleading and (iii) any violation or alleged
violation by Tetra Tech of the Securities Act, the Exchange Act or any state
securities or blue sky laws in connection with the Registration Statement,
Prospectus or preliminary prospectus or any amendment or supplement thereto,
PROVIDED that Tetra Tech will not be liable to any Holder to the extent that
such Damages arise from or are based upon any untrue statement or omission (x)
based upon written information furnished to Tetra Tech by such Holder expressly
for the inclusion in such Registration Statement, (y) made in any preliminary
prospectus if such Holder failed to deliver a copy of the Prospectus with or
prior to the delivery of written confirmation of the sale by such Holder to the
party asserting the claim underlying such Damages and such Prospectus would have
corrected such untrue statement or omission and (z) made in any Prospectus if
such untrue statement or omission was corrected in an amendment or supplement to
such Prospectus and such Holder failed to deliver such amendment or supplement
prior to or

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concurrently with the sale of Registrable Securities to the party asserting the
claim underlying such Damages.

            (b) INDEMNIFICATION BY HOLDER OF REGISTRABLE SECURITIES. Each Holder
of Registrable Securities whose Registrable Securities are sold under a
Prospectus which is a part of a Registration Statement agrees to indemnify and
hold harmless Tetra Tech, its directors and each officer who signed such
Registration Statement and each person who controls Tetra Tech (within the
meaning of Section 15 of the Securities Act), and each other Holder of
Registrable Securities whose Registrable Securities are sold under the
Prospectus which is a part of such Registration Statement (and such Holder's
officers, directors and employees and each person who controls such Holder
within the meaning of SECTION 15 of the Securities Act), under the same
circumstances as the foregoing indemnity from Tetra Tech to each Holder of
Registrable Securities to the extent that such losses, claims, damages,
liabilities or actions arise out of or are based upon any untrue statement of a
material fact or omission of a material fact that was made in the Prospectus,
the Registration Statement, or any amendment or supplement thereto, in reliance
upon and in conformity with information relating to such Holder furnished in
writing to Tetra Tech by such Holder expressly for use therein, PROVIDED that in
no event shall the aggregate liability of any selling Holder of Registrable
Securities exceed the amount of the net proceeds received by such Holder upon
the sale of the Registrable Securities giving rise to such indemnification
obligation. Tetra Tech and the selling Holders shall be entitled to receive
indemnities from underwriters, selling brokers, dealer managers and similar
securities industry professionals participating in the distribution, to the same
extent as customarily furnished by such persons in similar circumstances.

            (c) CONDUCT OF INDEMNIFICATION PROCEEDINGS. Any person entitled to
indemnification hereunder will (i) give prompt notice to the indemnifying party
of any claim with respect to which it seeks indemnification and (ii) permit such
indemnifying party to assume the defense of such claim with counsel reasonably
satisfactory to the indemnified party; PROVIDED, HOWEVER, that any person
entitled to indemnification hereunder shall have the right to employ separate
counsel and to participate in the defense of such claim, but the fees and
expenses of such counsel shall be at the expense of such person and not of the
indemnifying party unless (A) the indemnifying party has agreed to pay such fees
or expenses, (B) the indemnifying party shall have failed to assume the defense
of such claim and employ counsel reasonably satisfactory to such person or (C)
in the reasonable judgment of such person and the indemnifying party, based upon
advice of their respective counsel, a conflict of interest may exist between
such person and the indemnifying party with respect to such claims (in which
case, if the person notifies the indemnifying party in writing that such person
elects to employ separate counsel at the expense of the indemnifying party, the
indemnifying party shall not have the right to assume the defense of such claim
on behalf of such person). If such defense is not assumed by the indemnifying
party, the indemnifying party will not be subject to any liability for any
settlement made without its consent (but such consent will not be unreasonably
withheld). No indemnified party will be required to consent to entry of any
judgment or enter into any

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settlement which does not include as an unconditional term thereof the giving by
all claimants or plaintiffs to such indemnified party of a release from all
liability in respect to such claim or litigation. Any indemnifying party who is
not entitled to, or elects not to, assume the defense of a claim will not be
obligated to pay the fees and expenses of more than one counsel for all parties
indemnified by such indemnifying party with respect to such claim. As used in
this SECTION 7(C), the terms "indemnifying party", "indemnified party" and other
terms of similar import are intended to include only Tetra Tech (and its
officers, directors and control persons as set forth above) on the one hand, and
the Holders (and their officers, directors, partners, employees, attorneys and
control persons as set forth above) on the other hand, as applicable.

            (d) CONTRIBUTION. If for any reason the foregoing indemnity is
unavailable, then the indemnifying party shall contribute to the amount paid or
payable by the indemnified party as a result of such losses, claims, damages,
liabilities or expenses (i) in such proportion as is appropriate to reflect the
relative fault of the indemnifying party and the indemnified party in connection
with the statements or omissions which resulted in such losses, claims, damages,
liabilities or expenses, as well as any other relevant equitable considerations.
The relative fault of such indemnifying party and indemnified party shall be
determined by reference to, among other things, whether the untrue statement or
alleged untrue statement of a material fact or omission or alleged omission to
state a material fact relates to information supplied by such indemnifying party
or by such indemnified party, and the parties' relative intent, knowledge,
access to information and opportunity to correct or prevent such statement or
omission. The parties acknowledge and agree that it would not be just and
equitable if contribution pursuant to this SECTION 5(d) were determined by pro
rata allocation or by any other method of allocation which does not take into
account the equitable considerations referred to in this SECTION 5(d).
Notwithstanding the foregoing, no Holder shall be required to contribute any
amount in excess of the amount such Holder would have been required to pay to an
indemnified party if the indemnity under SECTION 5(b) hereof was available. No
person guilty of fraudulent misrepresentation (within the meaning of Section
11(f) of the Securities Act) shall be entitled to contribution from any person
who was not guilty of such fraudulent misrepresentation. The obligation of any
person to contribute pursuant to this SECTION 5(d) shall be several and not
joint.

            (e) TIMING OF PAYMENTS. An indemnifying party shall make payments of
all amounts required to be made pursuant to the foregoing provisions of this
SECTION 5 to or for the account of the indemnified party from time to time
promptly upon receipt of bills or invoices relating thereto or when otherwise
due or payable.

            (f) SURVIVAL. The indemnity and contribution agreements contained in
this SECTION 5 shall remain in full force and effect, regardless of any
investigation made by or on behalf of Tetra Tech, a participating Holder, its
officers, directors, partners, attorneys, agents or any person, if any, who
controls Tetra Tech or such Holder as aforesaid, and shall survive the transfer
of such Registrable Securities by such Holder.

         6. PREPARATION; REASONABLE INVESTIGATION. In connection with the
preparation and filing of a Registration Statement pursuant to the terms of this
Agreement:

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            (a) Tetra Tech shall, with respect to a Registration Statement filed
pursuant to SECTION 2, give the Holders of such Registrable Securities so
registered, their underwriters, if any, and their respective counsel and
accountants the opportunity to participate in the preparation of such
Registration Statement (other than reports and proxy statements incorporated
therein by reference and properly filed with the SEC) and each Prospectus
included therein or filed with the SEC, and each amendment thereof or supplement
thereto; and

            (b) Tetra Tech shall give the Holders of such Registrable Securities
so registered, their underwriters, if any, and their respective counsel and
accountants such reasonable access to its books and records and such
opportunities to discuss the business of Tetra Tech with its officers and the
independent public accountants who have certified its financial statements as
shall be necessary, in the opinion of such Holders or such underwriters, to
conduct a reasonable investigation within the meaning of Section 11(b)(3) of the
Securities Act.

         7. RULE 144. Tetra Tech covenants that it will use commercially
reasonable efforts to file, on a timely basis, the reports required to be filed
by it under the Securities Act and the Exchange Act and the rules and
regulations adopted by the SEC thereunder, and it will take such further action
as any Holder may reasonably request (including, without limitation, compliance
with the current public information requirements of Rule 144(c) and Rule 144A),
all to the extent required from time to time to enable such Holder to sell
Registrable Securities without registration under the Securities Act within the
limitation of the conditions provided by Rule 144, Rule 144A or any similar rule
or regulation hereafter adopted by the SEC. Upon the request of any Holder,
Tetra Tech will promptly deliver to such Holder a written statement verifying
that it has complied with such information and requirements.

         8. SPECIFIC PERFORMANCE. Each Holder, in addition to being entitled to
exercise all rights provided herein or granted by law, including recovery of
damages, will be entitled to specific performance of its rights under this
Agreement. Tetra Tech agrees that monetary damages would not be adequate
compensation for any loss incurred by reason of a breach by it of the provisions
of this Agreement and hereby agrees to waive the defense in any action for
specific performance that a remedy at law would be adequate.

         9. NOTICES. All notices and other communications required or permitted
hereunder shall be in writing and shall be mailed by United States first-class
mail, postage prepaid, sent by facsimile or delivered personally by hand or
nationally recognized courier addressed (a) if to a Holder, as indicated on the
list of Holders attached hereto as SCHEDULE A, or at such other address as such
Holder or permitted assignee shall have furnished to Tetra Tech in writing, or
(b) if to Tetra Tech, at such address or facsimile number as Tetra Tech shall
have furnished to each

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Holder in writing. All such notices and other written communications shall be
effective on the date of mailing, facsimile transfer or delivery.

         10. SUCCESSORS AND ASSIGNS: ASSIGNMENT OF RIGHTS. The rights and
benefits of a Holder hereunder may not be assigned to a transferee or assignee
without the consent of Tetra Tech; PROVIDED, HOWEVER, that, no later than the
10th day prior to the filing of the Registration Statement under SECTION 2
hereof, the rights and benefits of a Holder hereunder may be transferred in
connection with a transfer or assignment of any Registrable Securities held by
such Holder (i) by gift to immediate family members of such Holder, or trusts or
other entities for the sole benefit thereof, or (ii) by gift to any entity in
which such Holder, his or her immediate family members, or trusts or other
entities for the sole benefit thereof beneficially own all of the voting
securities; PROVIDED, HOWEVER, that in each case, the transferee executes an
instrument pursuant to which the transferee agrees to be bound by the terms and
conditions hereof as a Holder, and such other documents as Tetra Tech or its
counsel may reasonably require, after which, such transferee shall be deemed a
"Holder" hereunder. Any transfer of Registrable Securities, and rights
hereunder, shall be subject to compliance with applicable securities laws and
the restrictions contained in the Investment Letter executed by each Holder
pursuant to the Reorganization Agreement.

         11. SEVERABILITY. In the event that any one or more of the provisions
contained herein, or the application thereof in any circumstance, is held
invalid, illegal or unenforceable, the validity, legality and enforceability of
any such provision in every other respect and of the remaining provisions
contained herein shall not be affected or impaired thereby.

         12. ENTIRE AGREEMENT; AMENDMENT; WAIVER. This Agreement, the
Reorganization Agreement and the other agreements contemplated thereby
constitute the full and entire understanding and agreement among the parties
with regard to the subjects hereof and thereof. Without limiting the foregoing,
the rights of the Holders to registration pursuant to the terms of this
Agreement shall be subject to the limitations on resale contained in the
Investment Letter (as defined in the Reorganization Agreement). Neither this
Agreement nor any term hereof may be amended, waived, discharged or terminated,
except by a written instrument signed by Tetra Tech and the holders of at least
51% of the Registrable Securities and any such amendment, waiver, discharge or
termination shall be binding upon all the parties hereto, but in no event shall
the obligation of any party hereto be materially increased, except upon the
written consent of such party.

         13. COUNTERPARTS. This Agreement may be executed in any number of
counterparts, each of which shall be original, and all of which together shall
constitute one instrument.

         14. GOVERNING LAW. This Agreement shall be governed by, and construed
in accordance with, the laws of the State of California without giving effect to
principles of conflicts of laws thereof.

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         15. NO THIRD PARTY BENEFICIARIES. The covenants and agreements set
forth herein are for the sole and exclusive benefit of the parties hereto and
their respective successors and assigns and such covenants and agreements shall
not be construed as conferring, and are not intended to confer, any rights or
benefits upon any other persons.

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

                             TETRA TECH, INC.

                             By: /s/ Li-San Hwang
                                 -----------------------------------------------
                                 Li-San Hwang
                                 Chairman, Chief Executive Officer and President

                                 /s/ Daniel V. Ault
                             ---------------------------------------------------
                             Daniel V. Ault

                                 /s/ Don W. Deere
                             ---------------------------------------------------
                             Don W. Deere

                                 /s/ Thomas J. Hesemann
                             ---------------------------------------------------
                             Thomas J. Hesemann

                                 /s/ Mark Klee
                             ---------------------------------------------------
                             Mark Klee

                                 /s/ L. Stephen Schmidt
                             ---------------------------------------------------
                             L. Stephen Schmidt

                                 /s/ Jennifer E. Vecchi
                             ---------------------------------------------------
                             Jennifer E. Vecchi

                                 /s/ Leonard R. Wilson
                             ---------------------------------------------------
                             Leonard R. Wilson

                                       12
<PAGE>

                                                                      SCHEDULE A

                               SCHEDULE OF HOLDERS

<TABLE>
<CAPTION>
                                          NUMBER OF SHARES OF TETRA TECH COMMON
HOLDER'S NAME/ADDRESS/FACSIMILE NO.               STOCK ISSUED PURSUANT
                                            TO THE REORGANIZATION AGREEMENT
-----------------------------------       -------------------------------------
<S>                                       <C>
Daniel V. Ault                                         44,500
7835 Middlefork Road
Boulder, CO 80302
Facsimile: ______________

Don W. Deere                                           44,500
8592 Skyline Drive
Niwot, CO 80503
Facsimile: ______________

Thomas J. Hesemann                                     44,500
512 W. Arrowhead Court
Louisville, CO 80027
Facsimile: ______________

Mark Klee                                              29,667
7942 Field Court
Arvada, CO 80005
Facsimile: ______________
</TABLE>

                                       13
<PAGE>

<TABLE>
<CAPTION>
                                          NUMBER OF SHARES OF TETRA TECH COMMON
HOLDER'S NAME/ADDRESS/FACSIMILE NO.               STOCK ISSUED PURSUANT
                                            TO THE REORGANIZATION AGREEMENT
-----------------------------------       -------------------------------------
<S>                                       <C>
L. Stephen Schmidt                                     44,500
2120 S. Youngfield
Lakewood, CO 80228
Facsimile: ______________

Jennifer E. Vecchi                                     44,500
3509 Camden Drive
Longmont, CO 80104
Facsimile: ______________

Leonard R. Wilson                                      44,500
1050 N. Tabor Drive
Castle Rock, CO  80104
Facsimile: ______________
</TABLE>

                                       14Prepared by MERRILL CORPORATION www.edgaradvantage.com

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Exhibit 10.2—1997
Directors Stock Option Plan 

 
 

T.J.T., INC.
  1997 DIRECTORS STOCK OPTION PLAN    
  

ADOPTED ON NOVEMBER 18, 1997 and

AMENDED ON FEBRUARY 22, 2000  

ARTICLE 1: ESTABLISHMENT AND PURPOSE.  

	

1.1	
 	

Establishment. T.J.T., Inc., a Washington corporation (the "Company") hereby establishes the T.J.T., Inc. 1997 Stock Option Plan (the "Plan") effective as of November 18, 1997.
	

1.2	
 	

Purpose. The purpose of the Plan is to provide a means by which each director of the Company who is not otherwise employed on a full-time basis by the Company or of any affiliate of the Company (each such person being hereinafter referred to as a
"Non-Employee Director") will be given an opportunity to purchase stock of the Company.
	

 	
 	

1.2.1	
 	

The Plan is intended to strengthen the mutuality of interests between the Non-Employee Directors and the Company's shareholders and is designed to serve these purposes by offering stock options, thereby providing a proprietary interest in pursuing
the long-term growth, profitability and financial success of the Company.
	

 	
 	

1.2.2	
 	

The word "Affiliate" as used in the Plan means any parent corporation or subsidiary corporation of the Company as those terms are defined in Sections 424(e) and (f), respectively, of the Internal Revenue Code of 1986, as amended from time to time
(the "Code").
	

 	
 	

1.2.3	
 	

The Company, by means of the Plan, seeks to retain the services of persons now serving as Non-Employee Directors of the Company, to secure and retain the services of persons capable of serving in such capacity, and to provide incentives for such
persons to exert maximum efforts for the success of the Company.
	
 ARTICLE 2: ADMINISTRATION.
	

2.1	
 	

The Plan shall be administered by the Board of Directors of the Company (the "Board") unless and until the Board delegates administration to a committee, as provided in subparagraph 2.2.
	

2.2	
 	

The Board may delegate administration of the Plan to a committee of not fewer than two (2) members of the Board (the "Committee"). If administration is delegated to a Committee, the Committee shall have full power and authority to administer the
Plan in its sole discretion. Decisions of the Committee or any delegate as permitted by the Plan shall be final, conclusive, and binding on all participants. The Board may abolish the Committee at any time and revest in the Board the administration
of the Plan. No member of the Committee shall be liable for any action or determination made in good faith with respect to the Plan. The costs and expenses of administering the Plan shall be borne by the Company.
	
 ARTICLE 3: SHARES SUBJECT TO THE PLAN.
	

  The shares which may be made subject to awards under the Directors Plan shall be shares of common stock, which may be either authorized and unissued shares, or reacquired shares. The shares that may be sold pursuant to options granted
under the Directors Plan shall not exceed in the aggregate two hundred thousand (200,000) shares of the Company's common stock. If any option granted under the Directors Plan shall for any reason expire or otherwise terminate without having been
exercised in full, the stock not purchased under such option shall again become available for the Directors Plan.
	
	
 	

 	
 	

 

35

 

	
 ARTICLE 4: ELIGIBILITY.
	

  Options shall be granted only to Non-Employee Directors of the Company.
	
 ARTICLE 5: NON-DISCRETIONARY GRANTS.
	

5.1	
 	

On November 18, 1997, each person who is then a Non-Employee Director or a Non-Employee Director nominee shall be granted an option to purchase five thousand (5,000) shares of common stock of the Company on the terms and conditions set forth
herein.
	

5.2	
 	

Each person who is, after February 24, 1998, elected for the first time to be a Non-Employee Director shall, upon the date of his initial election to be a Non-Employee Director by the Board or stockholders of the Company, be granted an option to
purchase five thousand (5,000) shares of common stock of the Company on the terms and conditions set forth herein.
	

5.3	
 	

In addition to the foregoing, the executive committee of the Board of Directors may, with approval of the Board of Directors, grant additional options to Non-Employee Directors from time to time.
	
  ARTICLE 6: OPTIONS.

  Each option granted under the Plan shall be in the form of a non-qualified option. Options shall be subject to the terms and conditions set forth in Article 5 and this Article 6, and award agreements governing options shall
contain such additional terms and conditions, not inconsistent with the express provisions of the Plan, as the Board or Committee shall deem desirable.
	

6.1	
 	

The term of each option commences on the date it is granted and, unless sooner terminated as set forth herein, expires on the date ("Expiration Date") ten (10) years from the date of grant. If the optionee's service as a Director or subsequent
services as an employee of or consultant to the Company terminates for any reason or for no reason, the option shall terminate on the earlier of the Expiration Date or the date three (3) months following the date of termination of service;
provided, however, that if such termination of services is due to the optionee's death, the option shall terminate on the earlier of the Expiration Date or eighteen (18) months following the date of the optionee's death. In any and all
circumstances, an option may be exercised following termination of the optionee's service as a Director of the Company only as to that number of shares as to which it was exercisable on the date of termination of such service under the provisions of
subparagraph 6.5.
	

6.2	
 	

The exercise price of each option shall be 100 percent of the Fair Market Value of the stock subject to such option on the date such option is granted. "Fair Market Value" means, as of any date, the value of the common stock of the Company
determined as follows:
	

 	
 	

6.2.1	
 	

If the common stock is listed on any established stock exchange or a national market system, including without limitation the National Market System of the National Association of Securities Dealers, Inc. Automated Quotation ("NASDAQ") System,
the Fair Market Value of a share of common stock shall be the closing sales price for such stock (or the closing bid, if no sales were reported) as quoted on such system or exchange (or the exchange with the greatest volume of trading in common stock)
 on the last market trading day prior to the date of determination, as reporting in the Wall Street Journal or such other source as the Board deems reliable;
	

 	
 	

6.2.2	
 	

If the common stock is quoted on the NASDAQ System (but not on the National Market System thereof) or is regularly quoted by a recognized securities dealer but selling prices are not reported, the Fair Market Value of a share of common stock shall be
the mean between the bid and asked price for the common stock on the last market trading day prior to the date of determination, as reported in the Wall Street Journal or such other source as the Board deems reliable;
	
	
 	

 	
 	

 

36

 

	

 	
 	

6.2.3	
 	

In the absence of an established market for the common stock, the Fair Market Value shall be determined in good faith by the Board.
	

6.3	
 	

The optionee may elect to make payment of the exercise price under one of the following alternatives:
	

 	
 	

6.3.1	
 	

Payment of the exercise price per share in cash at the time of exercise;
	

 	
 	

6.3.2	
 	

Provided that at the time of the exercise the Company's common stock is publicly traded and quoted regularly in the Wall Street Journal, payment by delivery of shares of common stock of the Company already owned by the optionee, held for the period
required  to avoid a charge to the Company's reported earnings, and owned free and clear of any liens, claims, encumbrances or security interest, which common stock shall be valued at Fair Market Value on the date preceding the date of exercise;
or
	

 	
 	

6.3.3	
 	

Payment by a combination of the methods of payment specified in subparagraphs 6.3.1 and 6.3.2 above.
	

 	
 	

Notwithstanding the foregoing, any option may be exercised pursuant to a program developed under Regulation T as promulgated by the Federal Reserve Board which results in the receipt of cash (or check) by the Company prior to the issuance of
shares of the Company's common stock.
	

6.4	
 	

An option shall not be transferable except by will or by the laws of descent and distribution, and shall be exercisable during the lifetime of the person to whom the option is granted only by such person or by his guardian or legal representative.
The person to whom the option is granted may, by delivering written notice to the Company, in a form satisfactory to the Company, designate a third party who, in the event of the death of the optionee, shall thereafter be entitled to exercise the
option.
	

6.5	
 	

20 percent of the shares subject to the options granted pursuant to subparagraph 5.1 of this Plan shall become exercisable immediately. The remaining 80 percent of the shares subject to such options shall become exercisable in installments
over a period of four (4) years from the date of grant at the rate of 20 percent per year in four (4) equal installments commencing on November 18, 1997, provided that the optionee has, during the entire period prior to such
vesting date, continuously served as a Non-Employee Director or as an employee of or consultant to the Company or any Affiliate of the Company, whereupon such option shall become fully exercisable in accordance with its terms with respect to that
portion of the shares represented by that installment. Any option granted pursuant to subparagraph 5.2 of this Plan shall have 20% of the shares become immediately exercisable, with the remaining 80% of the shares becoming exercisable over a period
of four (4) years from the date of grant at the rate of 20 percent per year in four (4) equal installments commencing on the first anniversary of the date of grant of the option, provided that the optionee has, during the entire period
prior to such vesting date, continuously served as a Non-Employee Director or as an employee of or consultant to the Company or any Affiliate of the Company, whereupon such option shall become fully exercisable in accordance with its terms with
respect to that portion of the shares represented by that installment.
	

6.6	
 	

The Company may require any optionee, or any person to whom an option is transferred under subparagraph 6.4, as a condition of exercising any such option: (i) to give written assurances satisfactory to the Company as to the optionee's knowledge
and experience in financial and business matters; and (ii) to give written assurances satisfactory to the Company stating that such person is acquiring the stock subject to the option for such person's own account and not with any present
intention of selling or otherwise distributing the stock. These requirements, and any assurances given pursuant to such requirements, shall be inoperative if (i) the shares issued upon the exercise of the option have been registered under a
then-currently effective registration statement of the Company under the Securities Act of 1933, as amended (the "Securities Act"), or (ii) as to any particular requirement, a determination is made by counsel for the Company that such
requirement need not be met in the circumstances under the then applicable securities laws.
	
	
 	

 	
 	

 

37

 

	

6.7	
 	

Notwithstanding anything to the contrary contained herein, an option may not be exercised unless the shares issuable upon exercise of such option are then registered under the Securities Act or, if such shares are not then so registered, the Company
has determined that such exercise and issuance would be exempt from the registration requirements of the Securities Act.
	

6.8	
 	

Each award agreement regarding options granted under this Plan shall include a provision that as of a Change in Control Date an exercisable option shall become fully and immediately vested. For purposes of this Plan, Change in Control
means:
	

 	
 	

6.8.1	
 	

The acquisition by any person of beneficial ownership (within the meaning of Rule 13d-3 under the Exchange Act) of 20 percent or more of the combined voting power of the then outstanding shares that can be voted ("Voting Securities");
provided, however, that for purposes of this paragraph 6.8.1 the following acquisitions of Voting Securities shall not constitute a Change in Control: (i) any acquisition directly from the Company, (ii) any acquisition by the Company,
(iii) any acquisition by any employee benefit plan (or related trust) sponsored or maintained by the Company or any corporation controlled by the Company, or (iv) any acquisition by any corporation pursuant to a transaction that complies
with clauses (i), (ii), and (iii) of paragraph 6.8.3 of this definition of Change of Control; or
	

 	
 	

6.8.2	
 	

During any period of twelve (12) consecutive calendar months, individuals who at the beginning of such period constitute the Board (the "Incumbent Board") cease for any reason to constitute at least a majority of the Board; provided, however,
that any individual who becomes a director during the period whose election, or nomination for election, by the Company's shareholders was approved by a vote of at least a majority of the directors then constituting the Incumbent Board shall be
considered as though such individual were a member of the Incumbent Board, but excluding, for this purpose, any such individual whose initial assumption of office occurs as a result of an actual or threatened election contest with respect to the
election or removal of directors or other actual or threatened solicitation of proxies or consents by or on behalf of a Person other than the Board; or
	

 	
 	

6.8.3	
 	

Consummation of a reorganization, merger, or consolidation or sale or other disposition of all or substantially all of the assets of the Company (a "Business Combination") in each case, unless, following such Business Combination, (i) all or
substantially all of the individuals or entities who were the beneficial owners of the Voting Securities outstanding immediately prior to such Business Combination beneficially own, directly or indirectly, more than 50 percent of, respectively,
the then outstanding shares of common stock and the combined voting power of the then outstanding voting securities entitled to vote generally in the election of directors, as the case may be, of the corporation resulting from such Business
Combination (including, without limitation, a corporation which as a result of such transaction owns Company or all or substantially all of the Company's assets either directly or through one or more subsidiaries) in substantially the same
proportions as their ownership immediately prior to such Business Combination, of the Voting Securities, (ii) no Person (excluding any employee benefit plan, or related trust, of the Company or such corporation resulting from such Business
Combination) beneficially owns, directly or indirectly, 20 percent or more of, respectively, the then outstanding shares of common stock of the corporation resulting from such Business Combination or the combined voting power of the then
outstanding voting securities of such corporation except to the extent that such ownership existed prior to the Business Combination and (iii) at least a majority of the members of the board of directors of the corporation resulting from such
Business Combination were members of Incumbent Board at the time of the execution of the initial agreement, or of the action of the Board, providing for such Business Combination; or
	
	
 	

 	
 	

 

38

 

	

 	
 	

6.8.4	
 	

Approval by the shareholders of the Company of any plan or proposal for the liquidation or dissolution of the Company.
	

6.9	
 	

For purposes of this Plan, Change in Control Date means the first date following the grant date on which a change of control has occurred.
	
 ARTICLE 7: COVENANTS OF THE COMPANY.
	

7.1	
 	

During the terms of the options granted under the Plan, the Company shall keep available at all times the number of shares of stock required to satisfy such options.
	

7.2	
 	

The Company shall seek to obtain from each regulatory commission or agency having jurisdiction over the Plan such authority as may be required to issue and sell shares of stock upon exercise of the options granted under the Plan; provided, however,
that this undertaking shall not require the Company to register under the Securities Act either the Plan, any option granted under the Plan' or any stock issued or issuable pursuant to any such option. If, after reasonable efforts, the Company is
unable to obtain from any such regulatory commission or agency the authority which counsel for the Company deems necessary for the lawful issuance and sale of stock under the Plan, the Company shall be relieved from any liability for failure to issue
and sell stock upon exercise of such options.
	
 ARTICLE 8: USE OF PROCEEDS FROM STOCK.
	

  Proceeds from the sale of stock pursuant to options granted under the Plan shall constitute general funds of the Company.
	
 ARTICLE 9: MISCELLANEOUS.
	

9.1	
 	

Neither an optionee nor any person to whom an option is transferred under subparagraph 6.4 shall be deemed to be the holder of, or to have any rights of a holder with respect to, any shares subject to such options unless and until such person has
satisfied all requirements for exercise of the option pursuant to its terms.
	

9.2	
 	

Throughout the term of any option granted pursuant to the Plan, the Company shall make available to the holder of such option, not later than one hundred twenty (120) days after the close of each of the Company's fiscal years during the option
term, upon request, such financial and other information regarding the Company as comprises the annual report to the stockholders of the Company provided for in the Bylaws of the Company and such other information regarding the Company as the holder
of such option may reasonably request.
	

9.3	
 	

Nothing in the Plan or in any instrument executed pursuant thereto shall confer upon any Non-Employee Director any right to continue in the service of the Company or any Affiliate or shall affect any right of the Company, its Board or stockholders or
any Affiliate to terminate the service of any Non-Employee Director with or without cause.
	

9.4	
 	

No Non-Employee Director, individually or as a member of a group, and no beneficiary or other person claiming under or through him, shall have any right, title or interest in or to any option reserved for the purposes of the Plan except as to such
shares of common stock, if any, as shall have been reserved for him pursuant to an option granted to him.
	
	
 	

 	
 	

 

39

 

	

9.5	
 	

In connection with each option made pursuant to the Plan, it shall be a condition precedent to the Company's obligation to issue or  transfer shares to a Non-Employee Director, or to evidence the removal of any restrictions on transfer, that such
Non-Employee Director make arrangements satisfactory to the Company to insure that the amount of any federal or other withholding tax required to be withheld with respect to such sale or transfer, or such removal or lapse, is made available to the
Company for timely payment of such tax.
	
 ARTICLE 10: ADJUSTMENTS UPON CHANGES IN STOCK.
	

10.1	
 	

If any change is made in the stock subject to the Plan, or subject to any option granted under the Plan (through merger, consolidation, reorganization, recapitalization, stock dividend, dividend in property other than cash, stock split, liquidating
dividend, combination of shares, exchange of shares, change in corporate structure or otherwise), the Plan and outstanding options will be appropriately adjusted in the class(es) and maximum number of shares subject to the Plan and the class(es) and
number of shares and price per share of stock subject to outstanding options.
	

10.2	
 	

In the event of: (1) a merger or consolidation in which the Company is not the surviving corporation; (2) a reverse merger in which the Company is the surviving corporation but the shares of the Company's common stock outstanding
immediately preceding the merger are converted by virtue of the merger into other property, whether in the form of securities, cash or otherwise; or (3) any other capital reorganization in which more than 50 percent of the shares of the
Company entitled to vote are exchanged, any surviving corporation, other than the Company, shall assume any options outstanding under the Plan or shall substitute similar options for those outstanding under the Plan or, if the Company is the
surviving corporation, such options shall continue in full force and effect.
	
 ARTICLE 11: AMENDMENT OF THE PLAN.
	

11.1	
 	

The Board at any time, and from time-to-time, may amend the Plan, provided, however, that the Board shall not amend the plan more than once every six (6) months, with respect to the provisions
of the Plan which relate to the amount, price and timing of grants, other than to comport with changes in the Code, the Employee Retirement Income Security Act, or the rules thereunder. Except as provided in paragraph 10 relating to adjustments
upon changes in stock, no amendment shall be effective unless approved by the stockholders of the Company within twelve (12) months before or after the adoption of the amendment, where the amendment will:
	

 	
 	

11.1.1	
 	

Increase the number of shares which may be issued under the Plan.
	

 	
 	

11.1.2	
 	

Modify the requirement as to eligibility for participation in the Plan (to the extent such modification requires stockholder approval in order for the Plan to comply with the requirements of Rule 16b-3); or
	

 	
 	

11.1.3	
 	

Modify the Plan in any other way if such modification requires stockholder approval in order for the Plan to comply with the requirements of Rule 1 6b-3.
	

11.2	
 	

Rights and obligations under any option granted before any amendment of the Plan shall not be altered or impaired by such amendment unless (i) the Company requests the consent of the person to whom the option was granted and (ii) such
person consents in writing.
	
 ARTICLE 12: TERMINATION OR SUSPENSION OF THE PLAN.
	

12.1	
 	

The Board may suspend or terminate the Directors Plan at any time. Unless sooner terminated, the Directors Plan shall terminate on February 22, 2010, or 10 years from the date the option is granted, whichever is later. No options may be
granted under the Directors Plan while the Directors Plan is suspended or after it is terminated.
	
	
 	

 	
 	

 

40

 

	

12.2	
 	

Rights and obligations under any option granted while the Plan is in effect shall not be altered or impaired by suspension or termination of the Plan, except with the consent of the person to whom the option was granted.
	

12.3	
 	

The Plan shall terminate upon the occurrence of any of the events described in Section 10.2 above.
	
 ARTICLE 13: EFFECTIVE DATE OF PLAN; CONDITION OF EXERCISE.
	

13.1	
 	

The Plan shall become effective upon adoption by the Board of Directors, subject to the condition subsequent that the Plan is approved by the stockholders of the Company.
	

13.2	
 	

No option granted under the Plan shall be exercised or exercisable unless and until the condition of subparagraph 13.1 above has been met.

41

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