Document:

EXHIBIT

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                           IMPAC SECURED ASSETS CORP.,
                                  as Depositor,

                           IMPAC FUNDING CORPORATION,
                               as Master Servicer,

                                       and

                    BANKERS TRUST COMPANY OF CALIFORNIA, N.A.
                                   as Trustee

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

                           AMENDMENT NO. 1 dated as of
                            February 15, 2001 to the

                         POOLING AND SERVICING AGREEMENT

                          Dated as of September 1, 2000

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

                       Mortgage Pass-Through Certificates

                                  Series 2000-3

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                  AMENDMENT NO. 1 made as of this 15th day of February 2001,
among Impac Secured Assets Corp. (the "Depositor"), Impac Funding Corporation,
as master servicer (the "Master Servicer"), and Bankers Trust Company of
California, N.A., as trustee (the "Trustee").

                               W I T N E S S E T H
                               - - - - - - - - - -

                  WHEREAS, the Depositor, the Trustee and the Master Servicer
entered into a Pooling and Servicing Agreement (the "Agreement") dated as of
September 1, 2000, relating to the issuance of Mortgage Pass-Through
Certificates, Series 2000-3; and

                  WHEREAS, the Depositor, the Master Servicer and the Trustee
desire to amend the terms of the Agreement pursuant to and in accordance with
Section 11.01 of the Agreement.

                  NOW, THEREFORE, in consideration of the mutual premises and
agreements herein, the Depositor, the Master Servicer and the Trustee agree as
follows:

         1. Capitalized terms used herein and not defined herein shall have the
meanings assigned to such terms in the Agreement.

         2. The first sentence of the first paragraph of Section 5.02(d) of the
Agreement is amended by deleting the following clauses: "Senior Support
Certificate," and ", Class M Certificate".

         3. The third paragraph of Section 5.02(d) of the Agreement is amended
to read as follows:

         In the case of the Senior Support Certificates, Class M Certificates
and Class B-1 Certificates no restrictions shall apply with respect to the
transfer or registration of transfer of a beneficial interest in any such Senior
Support Certificate, Class M Certificate or Class B-1 Certificate that is a
Book-Entry Certificate to a transferee that takes delivery in the form of a
beneficial interest in the Book-Entry Certificate; provided that each such
transferee shall be deemed to have represented that either: (i) such person is
not a Plan subject to ERISA or the Code (or comparable provisions of any
subsequent enactments) and is not acting, directly or indirectly, on behalf of
any such Plan or acquiring such Certificate with Plan Assets; (ii) in the case
of the Senior Support Certificate and Class M Certificate, it has acquired and
is holding such Class M Certificates in reliance on the availability of
Prohibited Transaction Exemption 2000-58 with respect to the purchase, sale and
holding of such Certificates and the servicing, operation and management of the
Trust, and that it understands that there are certain conditions to the
availability of the Prohibited Transaction Exemption 2000-58, including that the
Class M Certificates must be rated, at the time of purchase, not lower that
"BBB-" (or its equivalent) by Standard & Poor's, Fitch or Moody's Investors
Service, Inc; or (iii) the purchase of such Certificate is permissible under
applicable law, will not constitute or result in any non-exempt prohibited
transaction under ERISA or Section 4975 of the Code, will not subject the
Company, the Trustee or the Master Servicer to any obligation or liability
(including obligations or liabilities under ERISA or Section 4975 of the Code)
in addition to those undertaken in this Agreement and the following conditions
are satisfied: (i) the transferee is an insurance company and the source of
funds used to purchase such Certificates is an "insurance company

                                        i

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general account" (as such term is defined in Prohibited Transaction Class
Exemption ("PTCE") 95- 60), (ii) the conditions set forth in Sections I and III
of PTCE 95-60 have been satisfied and (iii) there is no Plan with respect to
which the amount of such general account's reserves and liabilities for
contracts held by or on behalf of such Plan and all other Plans maintained by
the same employer (or any "affiliate" thereof, as defined in PTCE 95-60) or by
the same employee organization exceeds 10% of the total of all reserves and
liabilities of such general account (as determined under PTCE 95-60) as of the
date of the acquisition of such Certificates.

         4. The fourth paragraph of Section 5.02(d) of the Agreement is deleted
in its entirety.

         5. With respect to the Form of Class M Certificate provided as Exhibit
B-1 to the Agreement, the third paragraph of the face of the certificate and the
sixth paragraph of the body of the certificate are hereby amended to read
according as follows:

         Any person purchasing a Class M Certificate, unless the Trustee shall
have received an Officer's Certificate to the effect that such restrictions no
longer apply, shall be deemed to have represented that either: (i) such person
is not a Plan subject to ERISA or the Code (or comparable provisions of any
subsequent enactments) and is not acting, directly or indirectly, on behalf of
any such Plan or acquiring such Certificate with Plan Assets; (ii) in the case
of the Class M Certificates, it has acquired and is holding such Class M
Certificates in reliance on the availability of Prohibited Transaction Exemption
2000-58 with respect to the purchase, sale and holding of such Certificates and
the servicing, operation and management of the Trust, and that it understands
that there are certain conditions to the availability of the Prohibited
Transaction Exemption 2000-58, including that the Class M Certificates must be
rated, at the time of purchase, not lower that "BBB-" (or its equivalent) by
Standard & Poor's, Fitch or Moody's Investors Service, Inc; or (iii) the
purchase of such Certificate is permissible under applicable law, will not
constitute or result in any non-exempt prohibited transaction under ERISA or
Section 4975 of the Code, will not subject the Company, the Trustee or the
Master Servicer to any obligation or liability (including obligations or
liabilities under ERISA or Section 4975 of the Code) in addition to those
undertaken in this Agreement and the following conditions are satisfied: (i) the
transferee is an insurance company and the source of funds used to purchase such
Certificates is an "insurance company general account" (as such term is defined
in Prohibited Transaction Class Exemption ("PTCE") 95-60), (ii) the conditions
set forth in Sections I and III of PTCE 95-60 have been satisfied and (iii)
there is no Plan with respect to which the amount of such general account's
reserves and liabilities for contracts held by or on behalf of such Plan and all
other Plans maintained by the same employer (or any "affiliate" thereof, as
defined in PTCE 95-60) or by the same employee organization exceeds 10% of the
total of all reserves and liabilities of such general account (as determined
under PTCE 95-60) as of the date of the acquisition of such Certificates.

                                       ii

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         IN WITNESS WHEREOF, the Depositor, the Master Servicer and the Trustee
have caused their duly authorized representatives to execute and deliver this
instrument as of the date first above written.

                                       IMPAC SECURED ASSETS CORP.

                                       By:   /s/ Richard J. Johnson
                                          -------------------------
                                       Name:    Richard J. Johnson
                                       Title:   Executive Vice President,
                                                Chief Financial Officer

                                       IMPAC FUNDING CORPORATION

                                       By:  /s/ Lisa A. Duehring
                                          ----------------------
                                       Name:    Lisa A. Duehring
                                       Title:   Senior Vice President

                                                BANKERS TRUST COMPANY OF
                                                CALIFORNIA,
                                                N.A.

                                       By:  /s/ Paul T. Liu
                                          ----------------------
                                       Name:    Paul T. Liu
                                       Title:   Vice President

                                       iiiAMENDED AND RESTATED ESCROW AGREEMENT

                                                               October 11, 2000

The Chase Manhattan Bank
450 W.  33rd Street, 15th Floor
New York, New York 10001
Attn:  Mr.  Paul Gilkeson

Re:    Morgan Stanley Dean Witter Charter Series
       Escrow Account

Gentlemen:

                  In accordance with arrangements made by Demeter Management
Corporation, a Delaware corporation (the "General Partner"), on behalf of Morgan
Stanley Dean Witter Charter Graham L.P. ("Charter Graham"), Morgan Stanley Dean
Witter Charter Millburn L.P. ("Charter Millburn"), Morgan Stanley Dean Witter
Charter Welton L.P. ("Charter Welton"), and Morgan Stanley Dean Witter Charter
DWFCM L.P. ("Charter DWFCM"; together with Charter Graham, Charter Millburn, and
Charter Welton, the "Partnerships" and individually, a "Partnership"), and Dean
Witter Reynolds Inc., the selling agent for the Partnerships (the "Depositor";
the Partnerships and the Depositor being herein sometimes collectively referred
to as the "Parties" and, individually, as a "Party"), the Depositor shall: (i)
deliver to you, as Escrow Agent, all subscription funds (by the direct transfer
of immediately available funds into a non-interest-bearing escrow account
established by you for the Partnerships, for investment in your interest-bearing
money market account) received by the Depositor from each subscriber
("Subscriber" or, collectively, the "Subscribers") during each Partnership's
"Continuing Offering" (as described in the Partnerships' Prospectus, as the same
may be updated, supplemented, and amended from time to time (the "Prospectus")),
in connection with the offering to the public of units of limited partnership
interest of the Partnerships (the "Units"); and (ii) promptly transmit to the
General Partner a complete report of all funds deposited with you during the
Continuing Offering of each Partnership. Except as otherwise determined herein,
all capitalized terms used in this Agreement are defined in the Prospectus. You,
as Escrow Agent, shall hold such subscription funds, together with any
additions, substitutions, or other financial instruments in which such funds may
be invested or for which such funds may be exchanged (collectively referred to
herein as the "Fund"), IN ESCROW upon the following terms:

                  1. (a) Following receipt by you of written notice from the
General Partner that the General Partner has rejected a Subscriber's
subscription, in whole or in part, during the Continuing Offering, you shall
transmit to the Depositor, as soon as practicable but in no event later than
three business days following receipt by you of such notice (i) the amount of
such Subscriber's subscription funds that shall have been deposited with you
hereunder and that the General Partner shall have notified you of as having been
rejected, and (ii) any interest earned on the Fund and allocated to the rejected

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amount of such subscription in accordance with Section 2 hereof. You shall at
the same time give notice to the Depositor of the amount of aggregate
subscription funds and/or interest so returned.

                  (b) On the second business day before the scheduled day of
each closing, the General Partner shall notify you of the portion of the Fund
that represents subscriptions to be accepted by the General Partner for each
Partnership. Upon receipt by you of joint written notice from the General
Partner and the Depositor on the date of each such closing to the effect that
all of the terms and conditions with respect to the release of subscription
funds from escrow set forth in the Prospectus have been fulfilled, you shall
promptly pay and deliver to each of the Partnerships that portion of the Fund
specified for such Partnership in the General Partner's prior instructions
(excluding any interest earned on the Fund and funds relating to rejected
subscriptions).

                  (c) On the date of each closing, or as soon thereafter as
practicable, you shall transmit to the Depositor an amount representing: (i) for
each Subscriber whose subscription shall be accepted by the General Partner in
whole or in part, any interest earned on the Fund and allocated to the accepted
portion of such Subscriber's subscription in accordance with Section 2 hereof,
and (ii) for each Subscriber whose subscription shall have been rejected by the
General Partner in whole or in part but whose subscription funds shall not have
been previously returned to the Depositor by you in accordance with Section 1(a)
hereof, such Subscriber's subscription funds that shall have been deposited with
you hereunder and that shall have been rejected by the General Partner, and any
interest earned on the Fund and allocated to the rejected amount of such
subscription in accordance with Section 2 hereof. You shall at the same time
give notice to the Depositor of the aggregate amount of subscription funds
and/or interest so returned.

                  (d) Notwithstanding Section 1(a) hereof, upon receipt by you
of written notice from the General Partner that a Subscriber has been rejected
or has provided bad funds in the form of a bad check, draft, or otherwise to the
Depositor, you shall transmit to the Depositor, within three business days
following receipt by you of such notice, the amount of subscription funds
deposited with you hereunder relating to that amount (the portion of such
Subscriber's subscription for which good funds have not been provided) together
with any interest earned on the Fund and allocated to such portion of such a
subscription in accordance with Section 2 hereof to the date of such return, and
shall immediately notify the General Partner of the return of such funds.

                  2. You shall hold the Fund (including any interest earned
thereon) for the account of the Partnerships pending delivery to either the
Partnerships or the Depositor, pursuant to Paragraphs 1 or 3 hereof, as the case
may be. On each day that subscription funds are transferred to you hereunder in
immediately available funds and receipt is confirmed before 2:00 P.M., New York
City time, you shall immediately invest such subscription funds solely in your
interest-bearing money market account. If subscription funds are transferred to
you in immediately available funds and receipt is confirmed after 2:00 P.M., New
York City time, you shall so invest such funds on the next day. Interest earned
on the Fund shall be allocated by the Depositor among the Subscribers
proportionately based on (A) the amount of their respective subscriptions on
deposit in the Fund, and (B) the period of time from the date that their
respective subscriptions shall have been deposited in the Fund to the earlier of

                                      -2-

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the delivery of the Fund to the Partnerships at a closing or the Depositor in
accordance with Sections 1 or 3 hereof, as the case may be.

                  3. The Parties further agree with you as follows:

                  (a) Your duties and responsibilities shall be limited solely
to those expressly set forth in this Agreement and are ministerial in nature.
You shall neither be subject to nor obliged to recognize any other agreement
between, or other direction or instruction of, any or all of the Parties or any
Subscriber even though reference thereto may be made herein; provided, however,
that with your written consent, this Agreement may be amended at any time or
times by an instrument in writing signed by the Parties.

                  (b) You are authorized, in your sole discretion, to disregard
any and all notices or instructions given by any of the Parties or by any other
person, firm, or corporation, except only such notices or instructions as are
hereunder provided for and orders or process of any court entered or issued with
or without jurisdiction. If the Fund or any part thereof is at any time
attached, garnished, or levied upon under any court order or in case the
payment, assignment, transfer, conveyance, or delivery of the Fund shall be
stayed or enjoined by any court order, or in case any order, judgment, or decree
shall be made or entered by any court affecting the Fund or any part thereof,
then and in any such event you are authorized, in your sole discretion, to rely
upon and comply with any such order, writ, judgment, or decree that you are
advised by legal counsel of your own choosing is binding upon you, and if you
comply with any such order, writ, judgment, or decree you shall not be liable to
any of the Parties or to any other person, firm, or corporation by reason of
such compliance even though such order, writ, judgment, or decree may be
subsequently reversed, modified, annulled, set aside, or vacated.

                  (c) You shall be fully protected in relying upon any written
notice, demand, certificate, document, or instrument believed by you in good
faith to be genuine and to have been signed or presented by the proper person or
persons or Party or Parties. The Parties shall provide you with a list of
officers and employees who shall be authorized to deliver instructions
hereunder. You shall not be liable for any action taken or omitted by you in
connection herewith in good faith and in the exercise of your own best judgment.

                  (d) Should any dispute arise with respect to the delivery,
ownership, right of possession, and/or disposition of the subscription funds
deposited with you hereunder, or should any claim be made upon any such
subscription funds by a third party, you, upon receipt of written notice of such
dispute by any of the Parties or by a third party, are authorized and directed
to retain in your possession all or any of such subscription funds until such
dispute shall have been settled either by mutual agreement of the parties
involved or by final order, decree, or judgment of any court in the United
States.

                  (e) If for any reason funds are deposited in the escrow
account other than by transfer of immediately available funds, you shall proceed
as soon as practicable to collect checks, drafts, and other collection items at
any time deposited with you hereunder. All such collections shall be subject to
the usual collection agreement regarding items received by your commercial
banking department for deposit or collection; provided, however, that if any
check, draft, or other collection item at any time deposited with you hereunder

                                      -3-
<PAGE>

is returned to you as being uncollectable (except by reason of an account
closing), you shall attempt a second time to collect such item before returning
such item to the Depositor as uncollectable. Subject to the foregoing, you shall
promptly notify the Parties of any uncollectable check, draft, or other
collection item deposited with you hereunder and shall promptly return such
uncollectable item to the Depositor, in which case you shall not be liable to
pay any interest on the subscription funds represented by such uncollectable
item. In no event, however, shall you be required or have a duty to take any
legal action to enforce payment of any check or note deposited hereunder.

                  (f) You shall not be responsible for the sufficiency or
accuracy of the form, execution, validity, or genuineness of documents now or
hereafter deposited with you hereunder, or for any lack of endorsement thereon
or for any description therein, nor shall you be responsible or liable in any
respect on account of the identity, authority, or rights of the persons
executing or delivering or purporting to execute or deliver any such document,
or endorsement or this Agreement. You shall not be liable for any loss sustained
as a result of any investment made pursuant to the instructions of the Parties
or as a result of any liquidation of an investment prior to its maturity, or the
failure of the Parties to give you any instructions to invest or reinvest the
Fund or any earnings thereon.

                  (g) All notices required or desired to be delivered hereunder
shall be in writing and shall be effective when delivered personally on the day
delivered, or when given by registered or certified mail, postage prepaid,
return receipt requested, on the day of receipt, addressed as follows (or to
such other address as the party entitled to notice shall hereafter designate in
accordance with the terms hereof):

               if to a Partnership, the Partnerships or the General Partner:

                           Demeter Management Corporation
                           Two World Trade Center, 62nd Floor
                           New York, New York 10048
                           Attn:    Mr. Robert E. Murray
                                    President

               if to the Depositor:

                           Dean Witter Reynolds Inc.
                           Two World Trade Center, 62nd Floor
                           New York, New York 10048
                           Attn:    Mr. Robert E. Murray
                                    Senior Vice-President

               in either case with a copy to:

                           Cadwalader, Wickersham & Taft
                           100 Maiden Lane
                           New York, New York 10038
                           Attn: Edwin L. Lyon, Esq.

                                      -4-

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               if to you:

                           The Chase Manhattan Bank
                           450 W. 33rd Street, 15th Floor
                           New York, New York 10001
                           Attn:  Mr. Paul Gilkeson

Whenever, under the terms hereof, the time for giving a notice or performing an
act falls on a Saturday, Sunday, or legal holiday, such time shall be extended
to the next business day.

                  (h) The Depositor agrees to indemnify, defend, and hold you
harmless from and against, any and all loss, damage, tax, liability, and expense
that may be incurred by you arising out of or in connection with your duties
hereunder, except as caused by your gross negligence, bad faith, or willful
misconduct, including the legal costs and expenses of defending yourself against
any claim or liability in connection with your performance hereunder.

                  (i) You shall be paid by the Depositor for your services a fee
of $3,000 in advance for each twelve month period; the first twelve month period
beginning from the date of this Agreement (each twelve month period shall be
called a "Fee Period").

                  (j) It is understood that you may at any time resign hereunder
as Escrow Agent by giving written notice of your resignation to the Parties at
their address set forth above at least 20 days prior to the date specified for
such resignation to take effect, and upon the effective date of such
resignation, all property then held by you hereunder shall be delivered by you
to such person as may be designated jointly by the Parties in writing, whereupon
all your obligations hereunder shall cease and terminate. If you shall resign
prior to the conclusion of any Fee Period you shall pay to the Depositor an
amount equal to the product of $3,000 and a fraction, the numerator of which
shall be the number of days remaining in the Fee Period and the denominator of
which shall be 365. If no successor Escrow Agent has been appointed or has
accepted such appointment by such date, all your obligations hereunder shall
nevertheless cease and terminate. Your sole responsibility thereafter shall be
to keep safely all property then held by you and to deliver the same to a person
designated by the Parties hereto or in accordance with the directions of a final
order or judgment of a court of competent jurisdiction.

                  5. This Agreement shall be governed by and construed in
accordance with the law of the State of New York and any action brought
hereunder shall be brought in the courts of the State of New York, sitting in
the County of New York.

                  6. The undersigned Escrow Agent hereby acknowledges and agrees
to hold, deal with, and dispose of, the Fund (including any interest earned
thereon) and any other property at any time held by the Escrow Agent hereunder
in accordance with this Agreement.

                  If the foregoing Agreement is satisfactory to you, please so
indicate by signing at the place provided below.

                                      -5-

<PAGE>

                                         Sincerely,

                                         MORGAN STANLEY DEAN WITTER
                                           CHARTER GRAHAM L.P.

                                         By: Demeter Management Corporation

                                         By: /s/Robert E. Murray
                                             -------------------------
                                             Robert E. Murray
                                             President

                                         MORGAN STANLEY DEAN WITTER
                                           CHARTER MILLBURN L.P.

                                         By: Demeter Management Corporation
                                         By: /s/Robert E. Murray
                                             -------------------------
                                             Robert E. Murray
                                             President

                                         MORGAN STANLEY DEAN WITTER
                                           CHARTER WELTON L.P.

                                         By: Demeter Management Corporation

                                         By: /s/Robert E. Murray
                                             -------------------------
                                             Robert E. Murray
                                             President

                                      -6-
<PAGE>

                                         MORGAN STANLEY DEAN WITTER
                                           CHARTER DWFCM L.P.

                                         By: Demeter Management Corporation

                                         By: /s/Robert E. Murray
                                             -------------------------
                                             Robert E. Murray
                                             President

                                         DEAN WITTER REYNOLDS INC.

                                         By: /s/Robert E. Murray
                                             -------------------------
                                             Robert E. Murray
                                             President

Accepted:

THE CHASE MANHATTAN BANK

By: /s/ Paul Gilkeson
    ---------------------------
     Name:   Paul Gilkeson
     Title:  Vice-President

                                      -7-

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