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<td colspan="13"><strong>AMENDMENT OF SOLICITATION/MODIFICATION OF
CONTRACT</strong></td>
<td colspan="2"></td>
<td colspan="3"><blockquote>
<p>1. CONTRACT ID CODE</p>
</blockquote>
<p>     </p></td>
<td colspan="3"><blockquote>
<p>PAGE<br />
1 of 2</p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="4"><blockquote>
<p>2. AMENDMENT/MODIFICATION NO.</p>
</blockquote></td>
<td colspan="5"><blockquote>
<p>3. EFFECTIVE DATE</p>
</blockquote></td>
<td colspan="8"><blockquote>
<p>4. REQUISITION/PURCHASE NO.</p>
</blockquote></td>
<td colspan="4"><blockquote>
<p>5. PROJECT NO. <em>(If applicable)</em></p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="4"><blockquote>
<p>1</p>
</blockquote></td>
<td colspan="5"><blockquote>
<p>3/14/02</p>
</blockquote></td>
<td colspan="8"><blockquote>
<p>193816</p>
</blockquote></td>
<td colspan="4"><blockquote>
<p>     </p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="3"><blockquote>
<p>6. ISSUED BY</p>
</blockquote></td>
<td colspan="5">CODE</td>
<td colspan="3"><blockquote>
<p>0613/RLM</p>
</blockquote></td>
<td colspan="9"><blockquote>
<p>7. ADMINISTERED BY <em>(If other than Item 6)</em> CODE</p>
</blockquote></td>
<td><blockquote>
<p>     </p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="11"><blockquote>
<p>NASA Glenn Research Center<br />
Attn: Ronald L. Matthews<br />
Technology Support Branch<br />
21000 Brookpark Road, Mail Stop 500-306<br />
Cleveland, OH 44135-3191</p>
</blockquote></td>
<td colspan="10"><blockquote>
<p>     </p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="12"><blockquote>
<p>8. NAME AND ADDRESS OF CONTRACTOR <em>(No., street, county, State and
Zip Code)</em></p>
</blockquote></td>
<td colspan="4"></td>
<td colspan="5"><blockquote>
<p>9A. AMENDMENT OF SOLICITATION NO.</p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="12"><blockquote>
<p>To All Offerors/Bidders</p>
</blockquote></td>
<td colspan="4"></td>
<td colspan="5"><blockquote>
<p>RFQ3-193816</p>
<p>9B. DATED <em>(SEE ITEM 11)</em></p>
</blockquote>
<p>     </p>
<p>10A. MODIFICATION OF CONTRACT/ORDER NO.</p>
<p>     </p>
<p>10B. DATED <em>(SEE ITEM 13)</em></p></td>
</tr>
<tr class="even">
<td colspan="6">CODE      </td>
<td colspan="6"><blockquote>
<p>FACILITY CODE      </p>
</blockquote></td>
<td colspan="4"></td>
<td colspan="5"><blockquote>
<p>     </p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="21"><blockquote>
<p><strong>11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF
SOLICITATIONS</strong></p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="21"><p> The above numbered solicitation is amended as set
forth in Item 14. The hour and date specified for receipt of Offers is
extended, is not extended.<br />
Offers must acknowledge receipt of this amendment prior to the hour and
date specified in the solicitation or as amended, by one of the
following methods:</p>
<p>(a) By completing Items 8 and 15, and returning
<strong><u>   </u></strong> copies of the amendment; (b) By
acknowledging receipt of this amendment on each copy of the offer
submitted; or (c) By separate letter or telegram which includes a
reference to the solicitation and amendment numbers. <strong>FAILURE OF
YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE
RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN
REJECTION OF YOUR OFFER.</strong> If by virtue of this amendment you
desire to change an offer already submitted, such change may be made by
telegram or letter, provided each telegram or letter makes reference to
the solicitation and this amendment, and is received prior to the
opening hour and date specified.</p></td>
</tr>
<tr class="odd">
<td colspan="21"><blockquote>
<p>12. ACCOUNTING AND APPROPRIATION DATA <em>(If required)</em></p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="21"><blockquote>
<p>     </p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="21"><blockquote>
<p><strong>13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF
CONTRACTS/ORDERS,<br />
IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.</strong></p>
</blockquote></td>
</tr>
<tr class="even">
<td></td>
<td>A</td>
<td colspan="19"><p>THIS CHANGE ORDER IS ISSUED PURSUANT TO <em>(Specify
authority)</em>       THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE
CONTRACT ORDER NO. IN ITEM 10A.</p>
<p>     </p></td>
</tr>
<tr class="odd">
<td></td>
<td><blockquote>
<p>B</p>
</blockquote></td>
<td colspan="19"><blockquote>
<p>THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE
ADMINISTRATIVE CHANGES <em>(Such as changes in paying office,
appropriation date, etc.)</em>       SET FORTH IN ITEM 14, PURSUANT TO
THE AUTHORITY OF FAR 43.103(b).</p>
<p>     </p>
</blockquote></td>
</tr>
<tr class="even">
<td></td>
<td><blockquote>
<p>C</p>
</blockquote></td>
<td colspan="19"><p>THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT
TO AUTHORITY OF:</p>
<p>     </p></td>
</tr>
<tr class="odd">
<td></td>
<td><blockquote>
<p>D</p>
</blockquote></td>
<td colspan="19"><blockquote>
<p>OTHER <em>(Specify type of modification and authority)</em></p>
<p>     </p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="21"><blockquote>
<p><strong>E. IMPORTANT: Contractor</strong> <strong>is not,</strong>
<strong>is required to sign this document and return <u>   </u> copies
to the issuing office.</strong></p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="21"><blockquote>
<p>14. DESCRIPTION OF AMENDMENT/MODIFICATION <em>(Organized by UCF
section headings, including solicitation/contract subject matter where
feasible.)</em></p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="21"><blockquote>
<p>See Page 2.</p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="21">Except as provided herein, all terms and conditions of
the document referenced in Item 9A or 10A, as heretofore changed,
remains unchanged and in full force and effect.</td>
</tr>
<tr class="even">
<td colspan="10"><blockquote>
<p>15A. NAME AND TITLE OF SIGNER <em>(Type or print)</em></p>
</blockquote></td>
<td colspan="11"><blockquote>
<p>16A. NAME AND TITLE OF CONTRACTING OFFICER <em>(Type or
print)</em></p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="10"></td>
<td colspan="11">Ronald L. Matthews, Contracting Officer</td>
</tr>
<tr class="even">
<td colspan="7"><blockquote>
<p>15B. CONTRACTOR/OFFEROR</p>
</blockquote></td>
<td colspan="3"><blockquote>
<p>15C. DATE SIGNED</p>
</blockquote></td>
<td colspan="9"><blockquote>
<p>16B. UNITED STATES OF AMERICA</p>
</blockquote></td>
<td colspan="2"><blockquote>
<p>16C. DATE SIGNED</p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="7">BY_________________________________________</td>
<td colspan="3"></td>
<td colspan="9">BY_________________________________________</td>
<td colspan="2">     </td>
</tr>
<tr class="even">
<td colspan="7"><em>(Signature of person authorized to sign)</em></td>
<td colspan="3"></td>
<td colspan="9"><em>(Signature of Contracting Officer)</em></td>
<td colspan="2"></td>
</tr>
<tr class="odd">
<td colspan="5">NSN 7540-01-152-8070<br />
PREVIOUS EDITION NOT USABLE</td>
<td colspan="9">30-105</td>
<td colspan="7"><strong>STANDARD FORM 30 (REV. 10-83) (GRC Overprint
09/01)</strong><br />
Prescribed by GSA<br />
FAR (48 CFR) 53.243</td>
</tr>
</tbody>
</table>

The RFQ is hereby revised as follows:

1.  The quantity being procured is 16,000 liters of High Purity Xenon
    Gas (16 x 500 liter bottles and 8 x 1,000 liter bottles). The
    bottles will be purchased by the Glenn Research Center.

2.  An Optional 9,000 liters of High Purity Xenon Gas shall be priced
    out by the Contractor, this optional quantity will be subject to the
    AVAILABILITY OF FUNDS CLAUSE.

3.  The Option for the additional 9,000 liters, if exercised, will be
    exercised by the Government on or before September 30, 2002.

4.  Historical Data is as follows:

Purchase Date Price Per Liter Liters Purchased

> 4/8/92 \$8.85 8,500
>
> 1/14/94 2.75 10,000
>
> 2/11/94 3.39 5,000
>
> 7/15/94 2.40 12,500
>
> 2/8/96 2.18 21,000
>
> 5/30/97 3.87 20,000
>
> 4/20/99 7.80 100,000

5.  As a result of this Amendment the Response Date is hereby extended 7

days to 3/22/02.