June 27, 1997

Alabama Synfuel #1, Ltd.
c/o Covol Technologies, Inc.
3280 North Frontage Road
Lehi, Utah 84043

Covol Technologies, Inc.
3280 North Frontage Road
Lehi, Utah 84043

         Re:  Letter Amendment

Gentlemen:

         Reference is made to (i) the Alabama Project Purchase Agreement,  dated
as of March 20, 1997 (the "Project  Purchase  Agreement"),  by and among Alabama
Synfuel #1, Ltd. and Covol  Technologies,  Inc., as sellers,  and Birmingham Syn
Fuel, LLC, as buyer,  and (ii) the  Conditional  Option  Agreement,  dated as of
March 20, 1997 (the "Option  Agreement"),  by and among  Birmingham  Syn Fuel I,
Inc. (Birmingham Syn Fuel II, Inc. and PacifiCorp  Financial Services,  Inc., on
the one hand, and Alabama Synfuel #1, Ltd. and Covol Technologies,  Inc., on the
other hand.

         The parties to the Project Purchase  Agreement hereby amend the Section
5.3(c) of the Project  Purchase  Agreement by deleting  the  language  "June 30,
1997" and inserting in its place the language "November 30, 1997".

         The parties to the Option  Agreement hereby amend  subsections  1(b)(i)
and (ii) of the Option  Agreement by deleting  the language  "June 30, 1997" and
inserting in its place the language  "November 30, 1997" for subsection  1(b)(i)
and "August 31, 1997" for subsection 1(b)(ii), respectively.

         This letter agreement may be executed in one or more counterparts,  all
of which shall be considered one and the same letter agreement.

                                Very truly yours,

                                     BIRMINGHAM SYN FUEL I, INC.

                                     By: /s/ Reynold Roeder
                                        --------------------
                                     Name: Reynold Roeder
                                     Title:Vice President



                                     BIRMINGHAM SYN FUEL II, INC.

                                     By: /s/ Reynold Roeder
                                        --------------------
                                     Name: Reynold Roeder
                                     Title:Vice President


                                     BIRMINGHAM SYN FUEL, LLC

                                     By: /s/ Reynold Roeder
                                        --------------------
                                     Name: Reynold Roeder
                                     Title:Vice President


                                     PACIFICORP FINANCIAL SERVICES, INC.

                                     By: /s/ Reynold Roeder
                                        --------------------
                                     Name: Reynold Roeder
                                     Title:Vice President

ACCEPTED AND AGREED TO
AS OF THE DATE FIRST SET
FORTH ABOVE:

Alabama Synfuel #1, Ltd.

By: /s/ Brent M. Cook
   -------------------------------------------------------------
Name: Brent M. Cook
Title: President of Covol Technologies, Inc., a general partner

Covol Technologies, Inc.

By: /s/ Brent M. Cook
   -------------------
Name: Brent M. Cook
Title: President

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