Document:

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Confidential Treatment Requested by                                EXHIBIT 10.16
Associated Materials Incorporated

                                    AGREEMENT

         This Agreement, which together with the Land Sale Contract described in
paragraph 1 below, represents the entire agreement of the parties hereto with
respect to the subject matter hereof, is between Shintech Incorporated
("Seller") and Alside Division of Associated Materials Incorporated ("Buyer").
The parties hereto agree as follows:

1.       Seller  agrees to sell to Buyer, and Buyer agrees to purchase
         from Seller, approximately 20 acres of land outlined on Exhibit "A" at
         Seller's plant site in  Freeport,  Texas,  at a selling  price of $[ ]*
         per  acre.  Such sale is contingent  upon, and Buyer agrees to use
         said land for, the  construction of an extrusion facility to be
         operated by Buyer. Seller and Buyer agree to enter into a Land Sale
         Contract separate from this Agreement to consummate this part of the
         transaction,  which will contain the foregoing terms and such other
         terms as may be mutually  agreeable  to Seller and Buyer.  The
         transfer of the land to Buyer shall  be  completed  within  60 days
         from the  date of this  Agreement.  Buyer estimates that the
         construction of the extrusion  facility will be completed and  ready
         to commence production by December 31, 1998.

2.       Seller agrees to grant Buyer an appropriate right-of-way easement to
         obtain access to Highway 332 and to work with Buyer to obtain a
         right-of-way from Hoffman LaRoche, Dow Chemical, and, perhaps, others
         for a rail spur from the existing Union Pacific line. If Buyer is
         unable to obtain an acceptable right-of-way for a rail spur from such
         companies, Seller will use best reasonable efforts to locate another
         20-acre site with rail access adjacent to or nearby Seller's plant site
         for Buyer's use, in which event Buyer will construct its plant on such
         substitute site. In the event that Seller is not able to locate such
         substitute site, Buyer and Seller acknowledge this Agreement shall
         become null.

3.       Seller will sell and deliver to Buyer, and Buyer will purchase from
         Seller, for Buyer's own use and consumption at Buyer's West Salem, OH,
         Ennis, TX, and Freeport, TX plants on the terms and conditions stated
         herein, Seller's current Suspension Type PVC SE95OEG or Type SE950W
         resin ("resin").

4.       Buyer will provide Seller, thirty (30) days prior to each calendar
         quarter, its best estimate of the amount of resin to be purchased for
         each plant during the ensuing quarter.

5.       Delivery of resin to Buyer's West Salem, OH and Ennis, TX plants shall
         be by rail car unless otherwise agreed to by the parties. Delivery of
         resin to Buyer's Freeport, TX plant shall be by hopper trailer, unless
         otherwise agreed to by the parties. Title and risk of loss shall pass
         from Seller to Buyer as the rail car or hopper trailer containing the
         resin arrives at Buyer's plants.

6.       During the term of this  Agreement  and  subject to force
         majeure, Buyer agrees to buy and Seller agrees to sell approximately
         sixty percent (60%) of Buyer's entire resin requirements in each of
         1998 and 1999, and approximately seventy  percent (70%) of Buyer's
         entire resin  requirements  thereafter,  which

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* The redacted portion of this document has been omitted pursuant to a request
for confidential treatment and such redacted portion has been filed separately
with the Securities and Exchange Commission.
<PAGE>
Confidential Treatment Requested by
Associated Materials Incorporated

         entire resin  requirements,  per year are estimated to be 114 million
         pounds in 1998,  129 million  pounds in 1999,  143 million pounds in
         2000, and 157 million pounds  thereafter.  Seller shall ship and Buyer
         shall take resin in  reasonably uniform monthly quantities,
         acknowledging the seasonality of Buyer's production requirements. Buyer
         and Seller agree that Seller will provide approximately all of Buyer's
         resin  requirements  at Buyer's  Freeport,  TX, and West Salem,  OH
         plants. Notwithstanding the foregoing, (i) upon Buyer giving Seller
         [ ]* calendar days prior  notice,  Seller  agrees to supply  Buyer up
         to [ ]* pounds per month in excess of the monthly quantities stipulated
         above, and (ii) to the extent that Buyer's purchases  are less than
         [ ]* of Seller's  obligation to supply based on the above estimates for
         three consecutive months, Seller shall have the right to reduce Seller
         obligation to supply to [ ]*% of the actual average  monthly usage for
         the previous [ ]* months.

7.       Pricing for the sale and purchase of the resin shall be as follows

         a.       Every month during the term of this Agreement, Seller and
                  Buyer shall discuss and determine in good faith the Base Price
                  ("BP") on a mutually acceptable basis for such month, taking
                  into account changes, if any, in the resin market conditions
                  for such month. BP does not reflect any contractual discounts,
                  allowances, or other price adjustments, but does include
                  applicable taxes. [ ]*

         b.       To obtain the monthly selling price per pound for Buyer's
                  Freeport plant ("MSP"), the following adjustments will be
                  made to the BP; (all numbers are in cents per pound)

                     i)   If the BP is less than [ ]*, there is no adjustment

                     ii)  If the BP is [ ]* or greater, but less than [ ]*,
                          the adjustment is minus [ ]*.

                     iii) If the BP is [ ]* or greater, but less than [ ]*,
                          the adjustment is minus [ ]*.

                     iv)  If the BP is [ ]* or greater, but less than [ ]*,
                          the adjustment is minus [ ]*.

                     v)   If the BP is [ ]* or greater, but less than [ ]*,
                          the adjustment is minus [ ]*.

                     vi)  If the BP is [ ]* or greater, the adjustment is minus
                          [ ]*.

         c.       Except as provided in subsection (d) below, all pricing is
                  F.O.B. point of destination.

         d.       The following freight charges will be added to the MSP to
                  arrive at the monthly selling price for deliveries to Ennis,
                  TX and West Salem, OH.

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* The redacted portion of this document has been omitted pursuant to a request
for confidential treatment and such redacted portion has been filed separately
with the Securities and Exchange Commission.
<PAGE>
Confidential Treatment Requested by
Associated Materials Incorporated

                              [
                                                                         ]*

                  The freight charges may be adjusted on an annual contract
                  basis based upon changes in tariff rates.

         e.       For all rail shipments to Ennis, an additional discount of
                  [      ]* shall be allowed.

         f.       For each  calendar  year during the term of this  Agreement,
                  if Buyer  purchases  the  following volumes from Seller:

                  o        [  ]* million in 1998;
                  o        [  ]* million in 1999.
                  o        [  ]* million in 2000; and
                  o        [  ]* million thereafter,

                  an additional  discount of [       ]* will be allowed on all
                  resin  purchased by Buyer from Seller hereunder
                  ("End- of-Year Discount")

8.       Payment  terms for resin  purchases  shall be net sixty  (60)  days
         from date of  shipment  from  Seller's Freeport plant.

9.       In the event that in any month during this Agreement  Buyer
         receives a commercially  reasonable  quotation from  Occidental
         Chemical  Corporation or Borden  Plastics and Chemicals  for shipment
         that month to Ennis,  West Salem or Freeport  of  like  quantities  of
         a  product  of  equal  quality  to  the  same destination(s)  upon
         substantially the same payment and shipment terms as herein provided
         that is lower than the price determined  pursuant to paragraph 7
         hereof (net of all discounts  contemplated  hereunder) for such month,
         Buyer shall give Seller an  opportunity to review the pricing
         hereunder for such  destination(s) for the particular month.  Seller
         agrees to give every reasonable  consideration to such lower price
         offer for such month,  based upon Seller's  knowledge of the then
         current  market  conditions.  If Seller meets such lower price,  no
         further discounts  shall apply to such volume.  If Seller  elects not
         to meet such lower price, whether or not such lower price offer was
         commercially reasonable, Seller and Buyer shall be relieved from their
         respective  obligations under paragraph 6 above  for  such
         destinations  only  for the  particular  month.  However,  for
         End-of-Year  Discount calculation  purposes,  the amount purchased at
         such lower price will count toward the volume  described  in paragraph
         7 above,  whether or not Seller elects to meet such lower price.
         Buyer agrees to provide Seller with a copy of the quotation
         confirming such lower price or other  documentation  of such lower
         price acceptable to Seller.

10.      Seller will give Buyer [                    ]* at the then-existing BP
         from the announced effective date of any price increase.

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

* The redacted portion of this document has been omitted pursuant to a request
for confidential treatment and such redacted portion has been filed separately
with the Securities and Exchange Commission.

<PAGE>
Confidential Treatment Requested by
Associated Materials Incorporated

11.      EXCEPT AS EXPRESSLY SET OUT IN THIS AGREEMENT, SELLER MAKES NO OTHER
         WARRANTIES WITH RESPECT TO RESIN SOLD PURSUANT TO THIS AGREEMENT. THE
         WARRANTIES SET OUT IN THIS AGREEMENT ARE MADE EXPRESSLY IN LIEU OF AND
         EXCLUDE ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
         PARTICULAR PURPOSE AND ALL OTHER EXPRESS OR IMPLIED REPRESENTATIONS AND
         WARRANTIES.

12.      Buyer agrees to indemnify Seller from liability for damage to persons
         or property resulting from the use of the resin in manufacturing
         processes, or in combination with other substances, or otherwise. Buyer
         represents to Seller that it has used its own independent skill and
         expertise in connection with the selection and use of the resin
         purchased pursuant to this Agreement, and that it possesses skill and
         expertise in the handling, storage, transportation, treatment, use and
         disposal of the resin.

13.      Neither  Seller nor Buyer shall be liable  hereunder  for  special,
         incidental,  indirect,  punitive,  or consequential damages.

14.      Except as may be compelled by a court or governmental agency of
         competent jurisdiction, or when written approval is given by the other
         party, neither party hereto will disclose the contents of this
         Agreement to any third party with the exception of the portions of this
         Agreement.

15.      This Agreement will commence on January 1, 1998, for all orders placed
         after December 31, 1997, and shall continue until December 31, 2002,
         and from year to year thereafter unless either party shall give written
         notice of termination at least ninety (90) days prior to the end of the
         expiring contract year

Agreed and Accepted:                               Agreed and Accepted:

SHINTECH INCORPORATED                              ALSIDE DIVISION OF ASSOCIATED
                                                   MATERIALS INCORPORATED

By:      /S/ RICHARD MASON                           /S/ JAMES R. BUSSMAN
    --------------------------------        ------------------------------------
         Richard Mason                              James R. Bussman
         Secretary                                  President<PAGE>

                                                                    EXHIBIT 10.1

              AMENDMENT NUMBER SEVEN TO AGREEMENT FOR PURCHASE AND
                   ASSIGNMENT OF FOREIGN ACCOUNTS RECEIVABLE

         THIS AMENDMENT NUMBER SEVEN TO AGREEMENT FOR PURCHASE AND ASSIGNMENT OF
FOREIGN ACCOUNTS RECEIVABLE (this "Amendment"), dated effective as of September
30, 2002, is entered into by and among Grant Geophysical (Int'l) Inc., a Texas
corporation ("Grant"), the entities listed on the signature pages hereof (such
entities, the "Designated Affiliates"), and Elliott Associates, L.P., a Delaware
limited partnership ("Elliott").

         WHEREAS, Grant and Elliott are parties to that certain Agreement for
Purchase and Assignment of Foreign Accounts Receivable, dated August 3, 2001 (as
heretofore amended, supplemented or otherwise modified, the "Agreement");

         WHEREAS, Grant has requested that certain provisions of the Agreement
be amended so as to provide for an extension of the term of the Agreement to
October 31, 2003; and

         WHEREAS, subject to the terms and conditions set forth in this
Amendment, Grant, each Designated Affiliate and Elliott have agreed to amend the
Agreement as set forth more fully below.

         NOW THEREFORE, in consideration of the foregoing and for other good and
valuable consideration, the receipt and adequacy of which is hereby
acknowledged, the parties hereto agree as follows:

         1. Amendment of the Recitals to the Agreement. The second Whereas
clause of the Agreement is hereby amended and restated in its entirety to read
as follows:

         "WHEREAS, Elliott agrees to purchase from Grant up to a maximum amount
of Eleven Million Seven Hundred Thousand USD ($11,700,000), at any point in
time, commencing August 3, 2001 and extending through October 31, 2003;".

         2. Amendment of Section 6 of the Agreement. Section 6 of the Agreement
is hereby amended by the substitution of "October 31, 2003" for "September 30,
2002."

         3. Continuation of Liens. Each of Grant and the Designated Affiliates
hereby renew and affirm the security interests and liens created and granted in
the Agreement, as amended hereby, and agree that this Amendment shall in no
manner affect or impair such security interests and liens securing any and all
liabilities and obligations that may become due and owing by Grant and the
Designated Affiliates by reason of the Agreement, and that such security
interests and liens continue to be valid and subsisting.

         4. Survival of Representations and Warranties. All representations and
warranties made herein and in the Agreement, and all representations, warranties
and covenants relating to the Collateral under that certain Loan and Security
Agreement, dated as of May 11, 1999 and as amended, supplemented or otherwise
modified through and including the date hereof, by and among Grant Geophysical,
Inc., as borrower, the lenders named therein and

<PAGE>

Foothill Capital Corporation, as agent, shall survive the execution and delivery
of this Amendment, and no investigation of Elliott or any closing shall affect
the representations and warranties or the right of Elliott to rely upon them.

         5. Reference to Agreement. The Agreement, as amended hereby, and all
other Exhibits thereto, whether now or hereafter executed and delivered, are
hereby amended so that any reference to the Agreement shall mean a reference to
the Agreement, as amended by this Amendment.

         6. Continuing Effect; No Other Amendments or Waivers. Except as
expressly amended pursuant to this Amendment, the Agreement is and shall
continue to be in full force and effect in accordance with its terms, and this
Amendment shall not constitute Elliott's consent or indicate its willingness to
consent to any other amendment, modification or waiver of the Agreement.

         7. Costs and Expenses. Grant and the Designated Affiliates shall pay on
demand all costs and expenses incurred by Elliott in connection with the
preparation, negotiation and execution of this Amendment, including, without
limitation, the costs and fees of Elliott's legal counsel, and all costs and
expenses incurred by Elliott in connection with the enforcement or preservation
of any rights under the Agreement, as amended hereby.

         8. Severability. Any provision of this Amendment held by a court of
competent jurisdiction to be invalid or unenforceable shall not impair or
invalidate the remainder of this Amendment and the effect thereof shall be
confined to the provision so held to be invalid or unenforceable.

         9. Successors and Assigns. This Amendment is binding upon and shall
inure to the benefit of Elliott, Grant, the Designated Affiliates and their
respective successors and assigns, except Grant and the Designated Affiliates
may not assign or transfer any of their rights or obligations hereunder without
the prior written consent of Elliott.

         10. Counterparts. This Amendment may be executed in one or more
counterparts, each of which when so executed shall be deemed to be an original,
but all of which when taken together shall constitute one and the same
instrument.

         11. Facsimile Transmission of Signature. Any party to this Amendment
may indicate its intention to be bound by its execution and delivery of this
Amendment by its signature to the signature page hereof and the delivery of the
signature page hereof, to the other party or its representatives by facsimile
transmission or telecopy. The delivery of a party's signature on the signature
page by facsimile transmission or telecopy shall have the same force and effect
as if such party signed and delivered this Amendment in person.

         12. Governing Law. This Amendment shall be governed by, and construed
and interpreted in accordance with, the laws of the State of New York.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

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         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed and delivered by their respective duly authorized officers as of the
date first above written.

Address for Notices:                           GRANT GEOPHYSICAL (INT'L) INC.
16850 Park Row
Houston, Texas 77084
Fax: (281) 398-9996                            By: /s/ RICHARD F. MILES
                                                  ------------------------------
                                               Name:  Richard F. Miles
                                               Title: President & CEO

Address for Notices:                           GRANT GEOPHYSICAL, INC.
16850 Park Row
Houston, Texas 77084
Fax: (281) 398-9996                            By: /s/ RICHARD F. MILES
                                                  ------------------------------
                                               Name:  Richard F. Miles
                                               Title: President & CEO

Address for Notices:                           GRANT GEOPHYSICAL CORP.
16850 Park Row
Houston, Texas 77084
Fax: (281) 398-9996                            By: /s/ RICHARD F. MILES
                                                  ------------------------------
                                               Name:  Richard F. Miles
                                               Title: President & CEO

Address for Notices:                           ADVANCED SEISMIC TECHNOLOGY, INC.
16850 Park Row
Houston, Texas 77084
Fax: (281) 398-9996                            By: /s/ RICHARD F. MILES
                                                  ------------------------------
                                               Name:  Richard F. Miles
                                               Title: President & CEO

                                       3

<PAGE>

Address for Notices:                           GRANT GEOPHYSICAL DO BRASIL LTDA.
Rua Senador, 75
11th Floor
Rio de Janiero, R.J., Brazil                   By: /s/ RICHARD F. MILES
Fax:                                              ------------------------------
                                               Name:  Richard F. Miles
                                               Title: President & CEO

Address for Notices:                           P.T. GRANT GEOPHYSICAL INDONESIA
Menara Duta Office Building
2nd Floor
Wing "A", J1.                                  By: /s/ RICHARD F. MILES
H.R. Rasuna Said Kav. B-9                         ------------------------------
Kuningan                                       Name:  Richard F. Miles
Jakarta                                        Title: President & CEO
Indonesia
Fax:

Address for Notices:                           SOLID STATE GEOPHYSICAL, INC.
7309 Flint Road, S.E.
Calgary, Alberta
Canada T2H 1G3                                 By: /s/ RICHARD F. MILES
Fax:                                              ------------------------------
                                               Name:  Richard F. Miles
                                               Title: President & CEO

Address for Notices:                           ELLIOTT ASSOCIATES, L.P.
712 Fifth Avenue, 36th Floor
New York, New York 10019
Attn: Dan Gropper and Robert Haas              By: Elliott Capital Advisors,
Fax: (212) 974-2092                                L.P., as general partner
                                                  ------------------------------

                                               By: Braxton Associates, Inc.,
                                                   as general partner
                                                  ------------------------------

                                               By: /s/ ELLIOT GREENBERG
                                                  ------------------------------
                                                   Elliot Greenberg,
                                                   Vice-President

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