AMENDMENT TO
                             GROUND LEASE AGREEMENT

     THIS AMENDMENT TO GROUND LEASE  AGREEMENT  amends,  effective as of May 31,
1997 (the "Amendment Date"), that certain Ground Lease Agreement ("Lease") dated
July 15, 1995 by and between ALBEMARLE CORPORATION ("Lessor") and MEMC PASADENA,
INC. ("Lessee").

     Lessor and Lessee hereby agree as follows:

     1.   As of the Amendment Date, the real property  described in the attached
          Exhibits  B-1(A) and B-2(A) is added to the definition of "Land".  The
          addition of such real  property does not,  however,  change any of the
          terms of the Ground Lease Agreement, including the Initial Term or any
          Extension Term.

     2.   As of the Amendment Date, Section 2.1 is revised to read as follows:

               "Rent.  Lessee hereby tenders to Lessor and Lessor hereby accepts
               from Lessee the sum of $ 143,383.00,  which  constitutes  paid up
               rent for the  duration  of the Lease  Term for the  approximately
               15.8692 acres  comprising  the Land.  This consists of $50.00 per
               acre for the 12.3  acres  originally  leased  to Lessee as of the
               Commencement  Date and  $40,000  per  acre for the  approximately
               3.5692  acres which have been added to the Land  pursuant to this
               Amendment No. 1 to the Lease."

     3.   As to the 3.5692  acres which have been added to the Land  pursuant to
          this Amendment No. 1 to the Lease, Lessee will not build any permanent
          improvements  within five (5) feet of the  northern  property  line of
          Tract 2 (as shown in Exhibit B-1(A)).  If Lessee decides to fence this
          northern property line, then Lessee will, at its own cost and expense,
          remove any and all improvements  (whether permitted or otherwise) that
          Lessee  has made  within  this  five (5) foot  setback  and any  fence
          constructed  by Lessee  will be  constructed  outside of this five (5)
          foot setback.

     4.   All other terms and conditions of the Lease remain unchanged.


MEMC PASADENA, INC.                         ALBEMARLE CORPORATION


By:  /s/ William R. Cooke                By:  /s/ Thomas G. Avant
   ___________________________________      ____________________________________
Title:  President & COO                  Title:  Senior Vice President
Date:   6/19/97                          Date:   7/9/97



MEMC ELECTRONIC MATERIALS, INC.


By:  /s/ Charles W. Cook, Jr.
   ___________________________________
Title:  Corporate Vice President
Date:   4 June 97



                                 Exhibit B-1(A)

                            TRACT ONE - 0.8420 ACRES

COMMENCING at City of Houston Monument No. 5856 - 1603  (X=3,216,934.19 feet and
Y = 705,634.38 feet);

THENCE North 15 degree 11' 08" West,  a distance of 9,145.34  feet to a railroad
spike  set for the  northwest  corner  and  PLACE  OF  BEGINNING  of the  herein
described tract (X=3,214.538.60 feet and Y=714,460.39 feet);

THENCE  North 87 degree 19' 42" East , a distance  of 548.35  feet to a railroad
spike set for a corner of the herein described tract;

THENCE  South 78 degree  16' 37" East , a  distance  of 96.86 feet to a 1/2 inch
iron rod set for a corner of the herein described tract;

THENCE  North 87 degree 22' 58" East , a distance  of 119.13  feet to a 1/2 inch
iron rod set for a corner of the herein described tract;

THENCE  South 07 degree 40' 01" East , a distance  of 127.05  feet to a 1/2 inch
iron rod set for a corner of the herein described tract;

THENCE South 02 degree 41'44" East , a distance of 33.81 feet to a concrete nail
set for a corner of the herein described tract;

THENCE  South 87 degree  30' 46" West , a  distance  of 51.39 feet to a 1/2 inch
iron rod found for a corner of the herein described tract;

THENCE South 02 degree 59' 13" East, a distance of 52.20 feet to a 1/3 inch iron
rod found for a corner of the herein described tract;

THENCE  South 87 degree  19' 52" West , a  distance  of 79.68 feet to a 1/2 inch
iron rod found for a corner of the herein described tract;

THENCE  North 02 degree 31' 12" West , a distance  of 206.51  feet to a 1/2 inch
iron rod found for a corner of the herein described tract;

THENCE North 86 degree 32' 10" West, generally along the north line of a 12.2947
acre tract leased to MEMC Pasadena, Inc., a distance of 94.34 feet to a railroad
spike found for a corner of the herein described tract;

THENCE South 87 degree 20' 18" West , continuing  generally along the north line
of a 12.2947 acre tract leased to MEMC Pasadena, Inc., a distance of 562.70 feet
to a railroad  spike found for the  northwest  corner of the said  12.2947  acre
tract and the most westerly southwest corner of the herein described tract;

THENCE  North 12 degree 58' 31" West, a distance of 2.23 feet to a 1/2 inch iron
rod set for a cut-back corner of the herein described tract;

THENCE  North 37 degree 07' 06" East,  a distance  of 16.54 feet to the PLACE OF
BEGINNING of TRACT ONE, containing 0.8420 acres (36,676 square feet) of land.



                                 Exhibit B-2(A)

                            TRACT TWO - 2.7272 ACRES

COMMENCING at City of Houston Monument No. 5856-1603 (X=3,216.934.19 feet and Y=
705,634.38 feet);

THENCE North 11 degree 58' 05" West , a distance of 8,241.39  feet to a railroad
spike  set for the  northwest  corner  and  PLACE OF  BEGINNING  of the  herein
described tract (X=3,215,225.19 feet and Y=713,696.63 feet);

THENCE  South 02 degree 38' 27" East,  a distance  of 294.79  feet to a 1/2 inch
iron rod set for a corner of the herein described tract;

THENCE  South 87 degree 22' 58" West,  a distance  of 386.61  feet to a 1/2 inch
iron rod set for a corner of the herein described tract;

THENCE North 02 degree 37' 02" West, a distance of 46.00 feet to a 1/2 inch iron
rod set for a corner of the herein described tract;

THENCE South 87 degree 22' 58" West, a distance of 85.78 feet to a 1/2 inch iron
rod set for a corner of the herein described tract;

THENCE  North 02 degree 19' 57" West, a distance of 33.61 feet to a + scribed in
concrete set for a corner of the herein described tract;

THENCE North 02 degree 19' 47" West, a distance of 106.04 feet to a + scribed in
concrete for a corner of the herein described tract;

THENCE North 02 degree 19' 17" West, a distance of 72.60 feet to a 1/2 inch iron
rod found for a corner of the herein described tract;

THENCE  North 87 degree 50' 10" East,  a distance  of 428.10  feet to a 1/2 inch
iron rod round for a corner of the herein described tract;

THENCE  North 02 degree 24' 25" West,  a distance  of 41.14 feet to a chain link
fence corn post for a corner of the herein described tract;

THENCE  North 88 degree 59' 08" East,  a distance  of 43.03 feet to the PLACE OF
BEGINNING of TRACT TWO, containing 2.7272 acres (118,796 square feet) of land.